Getting the IP address of the current machine using Java

Question

I am trying to develop a system where there are different nodes that are run on different system or on different ports on the same system    Now all the nodes create a Socket with a target IP as the IP of a special node known as a bootstrapping node  The nodes then create their own ServerSocket and start listening for connections    The bootstrapping node maintains a list of Nodes and returns them on being queried   Now what I need is the node must register its IP to the bootstrapping node  I tried using cli getInetAddress   once the client connects to the ServerSocket of bootstrapping node but that didn t work    I need the client to register its PPP IP if available  Otherwise the LAN IP if available   Otherwise it must register 127 0 0 1 assuming its the same computer    Using the code   System out println Inet4Address getLocalHost   getHostAddress       or  System out println InetAddress getLocalHost   getHostAddress       My PPP Connection IP address is  117 204 44 192 but the above returns me 192 168 1 2  EDIT  I am using the following code   Enumeration e   NetworkInterface getNetworkInterfaces    while e hasMoreElements          NetworkInterface n    NetworkInterface  e nextElement        Enumeration ee   n getInetAddresses        while  ee hasMoreElements                  InetAddress i    InetAddress  ee nextElement            System out println i getHostAddress               I am able to get all the IP addresses associated all NetworkInterfaces  but how do I distinguish them  This is the output I am getting   127 0 0 1 192 168 1 2 192 168 56 1 117 204 44 19

User · Answer

This gets the IP address of your network if your machine is part of a network  try       System out println InetAddress getLocalHost   getHostAddress       catch  UnknownHostException e        e printStackTrace

User · Answer

Posting here tested IP ambiguity workaround code from https   issues apache org jira browse JCS-40  InetAddress getLocalHost   ambiguous on Linux systems           Returns an  lt code gt InetAddress lt  code gt  object encapsulating what is most likely the machine s LAN IP address      lt p  gt     This method is intended for use as a replacement of JDK method  lt code gt InetAddress getLocalHost lt  code gt   because    that method is ambiguous on Linux systems  Linux systems enumerate the loopback network interface the same    way as regular LAN network interfaces  but the JDK  lt code gt InetAddress getLocalHost lt  code gt  method does not    specify the algorithm used to select the address returned under such circumstances  and will often return the    loopback address  which is not valid for network communication  Details     lt a href  http   bugs sun com bugdatabase view bug do bug id 4665037  gt here lt  a gt       lt p  gt     This method will scan all IP addresses on all network interfaces on the host machine to determine the IP address    most likely to be the machine s LAN address  If the machine has multiple IP addresses  this method will prefer    a site-local IP address  e g  192 168 x x or 10 10 x x  usually IPv4  if the machine has one  and will return the    first site-local address if the machine has more than one   but if the machine does not hold a site-local    address  this method will return simply the first non-loopback address found  IPv4 or IPv6       lt p  gt     If this method cannot find a non-loopback address using this selection algorithm  it will fall back to    calling and returning the result of JDK method  lt code gt InetAddress getLocalHost lt  code gt       lt p  gt         throws UnknownHostException If the LAN address of the machine cannot be found      private static InetAddress getLocalHostLANAddress   throws UnknownHostException       try           InetAddress candidateAddress   null             Iterate all NICs  network interface cards             for  Enumeration ifaces   NetworkInterface getNetworkInterfaces    ifaces hasMoreElements                   NetworkInterface iface    NetworkInterface  ifaces nextElement                   Iterate all IP addresses assigned to each card                for  Enumeration inetAddrs   iface getInetAddresses    inetAddrs hasMoreElements                       InetAddress inetAddr    InetAddress  inetAddrs nextElement                    if   inetAddr isLoopbackAddress                           if  inetAddr isSiteLocalAddress                                 Found non-loopback site-local address  Return it immediately                            return inetAddr                                            else if  candidateAddress    null                               Found non-loopback address  but not necessarily site-local                             Store it as a candidate to be returned if site-local address is not subsequently found                            candidateAddress   inetAddr                             Note that we don t repeatedly assign non-loopback non-site-local addresses as candidates                             only the first  For subsequent iterations  candidate will be non-null                                                                          if  candidateAddress    null                   We did not find a site-local address  but we found some other non-loopback address                 Server might have a non-site-local address assigned to its NIC  or it might be running                IPv6 which deprecates the  site-local  concept                  Return this non-loopback candidate address                return candidateAddress                       At this point  we did not find a non-loopback address             Fall back to returning whatever InetAddress getLocalHost   returns            InetAddress jdkSuppliedAddress   InetAddress getLocalHost            if  jdkSuppliedAddress    null                throw new UnknownHostException  The JDK InetAddress getLocalHost   method unexpectedly returned null                       return jdkSuppliedAddress            catch  Exception e            UnknownHostException unknownHostException   new UnknownHostException  Failed to determine LAN address      e           unknownHostException initCause e           throw unknownHostException

User · Answer

Usually when i try to find my public IP Address like cmyip com or www iplocation net  i use this way    public static String myPublicIp            nslookup myip opendns com resolver1 opendns com       String ipAdressDns            try           String command    nslookup myip opendns com resolver1 opendns com           Process proc   Runtime getRuntime   exec command            BufferedReader stdInput   new BufferedReader new InputStreamReader proc getInputStream               String s          while   s   stdInput readLine       null                ipAdressDns     s     n                   catch  IOException e            e printStackTrace               return ipAdressDns

User · Answer

EDIT 1  Updated code  since the previous link  exists no more  import java io    import java net     public class GetMyIP       public static void main String   args            URL url   null          BufferedReader in   null          String ipAddress               try               url   new URL  http   bot whatismyipaddress com                in   new BufferedReader new InputStreamReader url openStream                  ipAddress   in readLine   trim                   IF not connected to internet  then                the above code will return one empty                String  we can check it s length and                if length is not greater than zero                  then we can go for LAN IP or Local IP                or PRIVATE IP                             if    ipAddress length    gt  0                     try                       InetAddress ip   InetAddress getLocalHost                        System out println  ip getHostAddress    trim                         ipAddress    ip getHostAddress    trim                      catch Exception exp                        ipAddress    ERROR                                             catch  Exception ex                   This try will give the Private IP of the Host              try                   InetAddress ip   InetAddress getLocalHost                    System out println  ip getHostAddress    trim                     ipAddress    ip getHostAddress    trim                  catch Exception exp                    ipAddress    ERROR                               ex printStackTrace                      System out println  IP Address      ipAddress             ACTUAL VERSION  This stopped working  Hopefully this snippet might help you to achieve this        Method to get the IP Address of the Host  private String getIP            This try will give the Public IP Address of the Host      try               URL url   new URL  http   automation whatismyip com n09230945 asp            BufferedReader in   new BufferedReader new InputStreamReader url openStream              String ipAddress   new String            ipAddress    in readLine    trim               IF not connected to internet  then            the above code will return one empty            String  we can check it s length and            if length is not greater than zero              then we can go for LAN IP or Local IP            or PRIVATE IP                     if    ipAddress length    gt  0                         try                               InetAddress ip   InetAddress getLocalHost                    System out println  ip getHostAddress    trim                     return   ip getHostAddress    trim                               catch Exception ex                                return  ERROR                                   System out println  IP Address is       ipAddress            return  ipAddress             catch Exception e                   This try will give the Private IP of the Host          try                       InetAddress ip   InetAddress getLocalHost                System out println  ip getHostAddress    trim                 return   ip getHostAddress    trim                       catch Exception ex                        return  ERROR

User · Answer

When you are looking for your  quot local quot  address  you should note that each machine has not only a single network interface  and each interface could has its own local address  Which means your machine is always owning several  quot local quot  addresses  Different  quot local quot  addresses will be automatically chosen to use when you are connecting to different endpoints  For example  when you connect to google com  you are using an  quot outside quot  local address  but when you connect to your localhost  your local address is always localhost itself  because localhost is just a loopback  Below is showing how to find out your local address when you are communicating with google com  Socket socket   new Socket    socket connect new InetSocketAddress  quot google com quot   80    System out println socket getLocalAddress     socket close

User · Answer

You can use java s InetAddress class for this purpose   InetAddress IP InetAddress getLocalHost    System out println  IP of my system is      IP getHostAddress       Output for my system   IP of my system is    10 100 98 228  getHostAddress   returns      Returns the IP address string in textual presentation    OR you can also do   InetAddress IP InetAddress getLocalHost    System out println IP toString       Output   IP of my system is    RanRag-PC 10 100 98 228

User · Answer

This could be a bit tricky in the most general case     On the face of it  InetAddress getLocalHost   should give you the IP address of this host   The problem is that a host could have lots of network interfaces  and an interface could be bound to more than one IP address   And to top that  not all IP addresses will be reachable outside of your machine or your LAN   For example  they could be IP addresses for virtual network devices  private network IP addresses  and so on   What this means is that the IP address returned by InetAddress getLocalHost   might not be the right one to use   How can you deal with this    One approach is to use NetworkInterface getNetworkInterfaces   to get all of the known network interfaces on the host  and then iterate over each NI s addresses  Another approach is to  somehow  get the externally advertized FQDN for the host  and use InetAddress getByName   to look up the primary IP address    But how do you get it  and how do you deal with a DNS-based load balancer   A variation of the previous is to get the preferred FQDN from a config file or a command line parameter  Another variation is to get the preferred IP address from a config file or a command line parameter    In summary  InetAddress getLocalHost   will typically work  but you may need to provide an alternative method for the cases where your code is run in an environment with  complicated  networking        I am able to get all the IP addresses associated all Network Interfaces  but how do i distinguish them     Any address in the range 127 xxx xxx xxx is a  loopback  address   It is only visible to  this  host  Any address in the range 192 168 xxx xxx is a private  aka site local  IP address   These are reserved for use within an organization   The same applies to 10 xxx xxx xxx addresses  and 172 16 xxx xxx through 172 31 xxx xxx  Addresses in the range 169 254 xxx xxx are link local IP addresses   These are reserved for use on a single network segment  Addresses in the range 224 xxx xxx xxx through 239 xxx xxx xxx are multicast addresses  The address 255 255 255 255 is the broadcast address  Anything else should be a valid public point-to-point IPv4 address    In fact  the InetAddress API provides methods for testing for loopback  link local  site local  multicast and broadcast addresses   You can use these to sort out which of the IP addresses you get back is most appropriate

User · Answer

You can use java net InetAddress API  Try this     InetAddress getLocalHost   getHostAddress

User · Answer

firstly import the class  import java net InetAddress    in class    InetAddress iAddress   InetAddress getLocalHost      String currentIp   iAddress getHostAddress      System out println  Current IP address      currentIp     gives only host address

User · Answer

Use InetAddress getLocalHost   to get the local address  import java net InetAddress   try     InetAddress addr   InetAddress getLocalHost                  System out println addr getHostAddress       catch  UnknownHostException e

User · Answer

Example in scala  useful in sbt file      import collection JavaConverters     import java net      def getIpAddress  String          val enumeration   NetworkInterface getNetworkInterfaces asScala toSeq      val ipAddresses   enumeration flatMap p   gt        p getInetAddresses asScala toSeq            val address   ipAddresses find   address   gt        val host   address getHostAddress       host contains       amp  amp   address isLoopbackAddress       getOrElse InetAddress getLocalHost       address getHostAddress

User · Answer

Since my system  like so many other systems  had various network interfaces InetAddress getLocalHost   or Inet4Address getLocalHost   simply returned one that I did not desire  Therefore I had to use this naive approach   InetAddress   allAddresses   Inet4Address getAllByName  YourComputerHostName            InetAddress desiredAddress            In order to find the desired Ip to be routed by other modules  WiFi adapter          for  InetAddress address                   allAddresses                if  address getHostAddress   startsWith  192 168 2                      desiredAddress   address                             Use the desired address for whatever purpose    Just be careful that in this approach I already knew that my desired IP address is in 192 168 2 subnet

User · Answer

import java net InetAddress  import java net NetworkInterface  import java util Enumeration   public class IpAddress    NetworkInterface ifcfg  Enumeration lt InetAddress gt  addresses  String address   public String getIpAddress String host        try           ifcfg   NetworkInterface getByName host           addresses   ifcfg getInetAddresses            while  addresses hasMoreElements                  address   addresses nextElement   toString                address   address replace                           catch  Exception e            e printStackTrace              return ifcfg toString

User · Answer

This is a working example of the ACCEPTED answer above  This NetIdentity class will store both the internal host ip  as well as the local loopback  If you re on a DNS based server  as mentioned above  you may need to add some more checks  or possible go the Configuration File Route   import java net InetAddress  import java net NetworkInterface  import java net SocketException  import java net UnknownHostException  import java util Enumeration          Class that allows a device to identify itself on the INTRANET          author Decoded4620 2016     public class NetIdentity        private String loopbackHost           private String host            private String loopbackIp           private String ip           public NetIdentity             try              Enumeration lt NetworkInterface gt  interfaces   NetworkInterface getNetworkInterfaces                 while interfaces hasMoreElements                     NetworkInterface i   interfaces nextElement                    if i    null                       Enumeration lt InetAddress gt  addresses   i getInetAddresses                        System out println i getDisplayName                         while addresses hasMoreElements                             InetAddress address   addresses nextElement                            String hostAddr   address getHostAddress                                local loopback                         if hostAddr indexOf  127       0                                this loopbackIp   address getHostAddress                                this loopbackHost   address getHostName                                                          internal ip addresses  behind this router                          if  hostAddr indexOf  192 168      0                                     hostAddr indexOf  10       0                                     hostAddr indexOf  172 16      0                                this host   address getHostName                                this ip   address getHostAddress                                                        System out println   t t-    address getHostName           address getHostAddress       -    address getAddress                                                                             catch SocketException e                      try              InetAddress loopbackIpAddress   InetAddress getLocalHost                this loopbackIp   loopbackIpAddress getHostName                System out println  LOCALHOST      loopbackIp                     catch UnknownHostException e               System err println  ERR      e toString                          public String getLoopbackHost            return loopbackHost             public String getHost            return host            public String getIp            return ip            public String getLoopbackIp            return loopbackIp            When I run this code I actually get a print out like this       Software Loopback Interface 1         -127 0 0 1 127 0 0 1 -  B 19e1023e         -0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 -  B 7cef4e59 Broadcom 802 11ac Network Adapter         -VIKING yourisp com 192 168 1 142 -  B 64b8f8f4         -fe80 0 0 0 81fa 31d 21c9 85cd wlan0 fe80 0 0 0 81fa 31d 21c9 85cd wlan0 -  B 2db0f6b2 Microsoft Kernel Debug Network Adapter Intel Edison USB RNDIS Device Driver for user-mode network applications Cisco Systems VPN Adapter for 64-bit Windows VirtualBox Host-Only Ethernet Adapter         -VIKING 192 168 56 1 -  B 3cd1f1c8         -VIKING fe80 0 0 0 d599 3cf0 5462 cb7 eth4 -  B 3a4afd8d LogMeIn Hamachi Virtual Ethernet Adapter         -VIKING 25 113 118 39 -  B 1996cd68         -VIKING 2620 9b 0 0 0 0 1971 7627 -  B 3339ad8e         -VIKING fe80 0 0 0 51bf 994d 4656 8486 eth5 -  B 555590 Bluetooth Device  Personal Area Network          -fe80 0 0 0 4c56 8009 2bca e16b eth6 fe80 0 0 0 4c56 8009 2bca e16b eth6 -  B 3c679bde Bluetooth Device  RFCOMM Protocol TDI  Intel R  Ethernet Connection  2  I218-V         -fe80 0 0 0 4093 d169 536c 7c7c eth7 fe80 0 0 0 4093 d169 536c 7c7c eth7 -  B 16b4a017 Microsoft Wi-Fi Direct Virtual Adapter         -fe80 0 0 0 103e cdf0 c0ac 1751 wlan1 fe80 0 0 0 103e cdf0 c0ac 1751 wlan1 -  B 8807e25 VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6 0 Filter Driver-0000 VirtualBox Host-Only Ethernet Adapter-WFP Native MAC Layer LightWeight Filter-0000 VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6 0 Filter Driver-0001 VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6 0 Filter Driver-0002 VirtualBox Host-Only Ethernet Adapter-VirtualBox NDIS Light-Weight Filter-0000 VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6 0 Filter Driver-0003 VirtualBox Host-Only Ethernet Adapter-QoS Packet Scheduler-0000 VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6 0 Filter Driver-0004 VirtualBox Host-Only Ethernet Adapter-WFP 802 3 MAC Layer LightWeight Filter-0000 VirtualBox Host-Only Ethernet Adapter-HHD Software NDIS 6 0 Filter Driver-0005 Intel R  Ethernet Connection  2  I218-V-HHD Software NDIS 6 0 Filter Driver-0000 Intel R  Ethernet Connection  2  I218-V-WFP Native MAC Layer LightWeight Filter-0000 Intel R  Ethernet Connection  2  I218-V-HHD Software NDIS 6 0 Filter Driver-0001 Intel R  Ethernet Connection  2  I218-V-Shrew Soft Lightweight Filter-0000 Intel R  Ethernet Connection  2  I218-V-HHD Software NDIS 6 0 Filter Driver-0002 Intel R  Ethernet Connection  2  I218-V-VirtualBox NDIS Light-Weight Filter-0000 Intel R  Ethernet Connection  2  I218-V-HHD Software NDIS 6 0 Filter Driver-0003 Intel R  Ethernet Connection  2  I218-V-QoS Packet Scheduler-0000 Intel R  Ethernet Connection  2  I218-V-HHD Software NDIS 6 0 Filter Driver-0004 Intel R  Ethernet Connection  2  I218-V-WFP 802 3 MAC Layer LightWeight Filter-0000 Intel R  Ethernet Connection  2  I218-V-HHD Software NDIS 6 0 Filter Driver-0005 Broadcom 802 11ac Network Adapter-WFP Native MAC Layer LightWeight Filter-0000 Broadcom 802 11ac Network Adapter-Virtual WiFi Filter Driver-0000 Broadcom 802 11ac Network Adapter-Native WiFi Filter Driver-0000 Broadcom 802 11ac Network Adapter-HHD Software NDIS 6 0 Filter Driver-0003 Broadcom 802 11ac Network Adapter-Shrew Soft Lightweight Filter-0000 Broadcom 802 11ac Network Adapter-HHD Software NDIS 6 0 Filter Driver-0004 Broadcom 802 11ac Network Adapter-VirtualBox NDIS Light-Weight Filter-0000 Broadcom 802 11ac Network Adapter-HHD Software NDIS 6 0 Filter Driver-0005 Broadcom 802 11ac Network Adapter-QoS Packet Scheduler-0000 Broadcom 802 11ac Network Adapter-HHD Software NDIS 6 0 Filter Driver-0006 Broadcom 802 11ac Network Adapter-WFP 802 3 MAC Layer LightWeight Filter-0000 Broadcom 802 11ac Network Adapter-HHD Software NDIS 6 0 Filter Driver-0007 Microsoft Wi-Fi Direct Virtual Adapter-WFP Native MAC Layer LightWeight Filter-0000 Microsoft Wi-Fi Direct Virtual Adapter-Native WiFi Filter Driver-0000 Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6 0 Filter Driver-0002 Microsoft Wi-Fi Direct Virtual Adapter-Shrew Soft Lightweight Filter-0000 Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6 0 Filter Driver-0003 Microsoft Wi-Fi Direct Virtual Adapter-VirtualBox NDIS Light-Weight Filter-0000 Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6 0 Filter Driver-0004 Microsoft Wi-Fi Direct Virtual Adapter-QoS Packet Scheduler-0000 Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6 0 Filter Driver-0005 Microsoft Wi-Fi Direct Virtual Adapter-WFP 802 3 MAC Layer LightWeight Filter-0000 Microsoft Wi-Fi Direct Virtual Adapter-HHD Software NDIS 6 0 Filter Driver-0006   For my use I m setting up a Upnp Server  it helped to understand the  pattern  that i was looking for  Some of the objects returned are Ethernet Adapters  Network Adapters  Virtual Network Adapters  Drivers  and VPN Client Adapters  Not everything has an Address either  So you ll want to skip out on interface objects that don t   You can also add this to the loop for the current NetworkInterface i  while interfaces hasMoreElements         Enumeration lt InetAddress gt  addresses   i getInetAddresses        System out println i getDisplayName         System out println   t- name     i getName         System out println   t- idx     i getIndex         System out println   t- max trans unit  MTU      i getMTU         System out println   t- is loopback     i isLoopback         System out println   t- is PPP     i isPointToPoint         System out println   t- isUp     i isUp         System out println   t- isVirtual     i isVirtual         System out println   t- supportsMulticast     i supportsMulticast         And You ll see information in your output much like this   Software Loopback Interface 1     - name lo     - idx 1     - max trans unit  MTU  -1     - is loopback true     - is PPP false     - isUp true     - isVirtual false     - supportsMulticast true         -ADRESS   127 0 0 1 VIKING-192 168 56 1  127 0 0 1 127 0 0 1 -  B 19e1023e         -ADRESS   0 0 0 0 0 0 0 1 VIKING-192 168 56 1  0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 -  B 7cef4e59 Broadcom 802 11ac Network Adapter     - name wlan0     - idx 2     - max trans unit  MTU  1500     - is loopback false     - is PPP false     - isUp true     - isVirtual false     - supportsMulticast true         -ADRESS   VIKING monkeybrains net VIKING-192 168 56 1  VIKING monkeybrains net 192 168 1 142 -  B 64b8f8f4         -ADRESS   fe80 0 0 0 81fa 31d 21c9 85cd wlan0 VIKING-192 168 56 1  fe80 0 0 0 81fa 31d 21c9 85cd wlan0 fe80 0 0 0 81fa 31d 21c9 85cd wlan0 -  B 2db0f6b2 Microsoft Kernel Debug Network Adapter     - name eth0     - idx 3     - max trans unit  MTU  -1     - is loopback false     - is PPP false     - isUp false     - isVirtual false     - supportsMulticast true

User · Answer

A rather simplistic approach that seems to be working     String getPublicIPv4   throws UnknownHostException  SocketException      Enumeration lt NetworkInterface gt  e   NetworkInterface getNetworkInterfaces        String ipToReturn   null      while e hasMoreElements                  NetworkInterface n    NetworkInterface  e nextElement            Enumeration lt InetAddress gt  ee   n getInetAddresses            while  ee hasMoreElements                          InetAddress i    InetAddress  ee nextElement                String currentAddress   i getHostAddress                logger trace  IP address   currentAddress    found                if  i isSiteLocalAddress   amp  amp  i isLoopbackAddress    amp  amp  validate currentAddress                    ipToReturn   currentAddress                   else                  System out println  Address not validated as public IPv4                                        return ipToReturn     private static final Pattern IPv4RegexPattern   Pattern compile               01    d  d  2 0-4   d 25 0-5       3   01    d  d  2 0-4   d 25 0-5        public static boolean validate final String ip        return IPv4RegexPattern matcher ip  matches

User · Answer

import java net DatagramSocket  import java net InetAddress   try final DatagramSocket socket   new DatagramSocket       socket connect InetAddress getByName  8 8 8 8    10002     ip   socket getLocalAddress   getHostAddress        This way works well when there are multiple network interfaces  It always returns the preferred outbound IP  The destination 8 8 8 8 is not needed to be reachable    Connect on a UDP socket has the following effect  it sets the destination for Send Recv  discards all packets from other addresses  and - which is what we use - transfers the socket into  connected  state  settings its appropriate fields  This includes checking the existence of the route to the destination according to the system s routing table and setting the local endpoint accordingly  The last part seems to be undocumented officially but it looks like an integral trait of Berkeley sockets API  a side effect of UDP  connected  state  that works reliably in both Windows and Linux across versions and distributions    So  this method will give the local address that would be used to connect to the specified remote host  There is no real connection established  hence the specified remote ip can be unreachable   Edit   As  macomgil says  for MacOS you can do this   Socket socket   new Socket    socket connect new InetSocketAddress  google com   80    System out println socket getLocalAddress

User · Answer

private static InetAddress getLocalAddress            try               Enumeration lt NetworkInterface gt  b   NetworkInterface getNetworkInterfaces                while  b hasMoreElements                     for   InterfaceAddress f   b nextElement   getInterfaceAddresses                        if   f getAddress   isSiteLocalAddress                            return f getAddress                            catch  SocketException e                e printStackTrace                      return null

[java] Getting the IP address of the current machine using Java

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