Get IPv4 addresses from Dns GetHostEntry

Question

I ve got some code here that works great on IPv4 machines  but on our build server  an IPv6  it fails   In a nutshell   IPHostEntry ipHostEntry   Dns GetHostEntry string Empty     The documentation for GetHostEntry says that passing in string Empty will get you the IPv4 address of the localhost   This is what I want   The problem is that it s returning the string    1   on our IPv6 machine  which I believe is the IPv6 address   Pinging the machine from any other IPv4 machine gives a good IPv4 address    and doing a  ping -4 machinename  from itself gives the correct IPv4 address     but pinging it regularly from itself gives    1     How can I get the IPv4 for this machine  from itself

User · Answer

IPv6  lblIP Text   System Net Dns GetHostEntry System Net Dns GetHostName  AddressList 0  ToString      IPv4  lblIP Text   System Net Dns GetHostEntry System Net Dns GetHostName  AddressList 1  ToString

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IPHostEntry ipHostInfo   Dns GetHostEntry serverName   IPAddress ipAddress   ipHostInfo AddressList      FirstOrDefault a   gt  a AddressFamily    AddressFamily InterNetwork

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public static string GetIPAddress string hostname                IPHostEntry host          host   Dns GetHostEntry hostname            foreach  IPAddress ip in host AddressList                        if  ip AddressFamily    System Net Sockets AddressFamily InterNetwork                                  System Diagnostics Debug WriteLine  LocalIPadress      ip                   return ip ToString                                    return string Empty

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public Form1                 InitializeComponent             string myHost   System Net Dns GetHostName            string myIP   null           for  int i   0  i  lt   System Net Dns GetHostEntry myHost  AddressList Length - 1  i                          if  System Net Dns GetHostEntry myHost  AddressList i  IsIPv6LinkLocal    false                                myIP   System Net Dns GetHostEntry myHost  AddressList i  ToString                                    Declare myIP and myHost in public Variable and use in any function of the form

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To find all local IPv4 addresses   IPAddress   ipv4Addresses   Array FindAll      Dns GetHostEntry string Empty  AddressList      a   gt  a AddressFamily    AddressFamily InterNetwork     or use Array Find or Array FindLast if you just want one

User · Answer

Have you looked at all the addresses in the return  discard the ones of family InterNetworkV6 and retain only the IPv4 ones

User · Answer

To find all valid address list this is the code I have used   public static IEnumerable lt string gt  GetAddresses           var host   Dns GetHostEntry Dns GetHostName           return  from ip in host AddressList where ip AddressFamily    AddressFamily lo select ip ToString    ToList

[c#] Get IPv4 addresses from Dns.GetHostEntry()

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