Command line for looking at specific port

Question

Is there a way to examine the status of a specific port from the Windows command line  I know I can use netstat to examine all ports but netstat is slow and looking at a specific port probably isn t

User · Answer

netstat -a -n   find  c  10 240 199 9 8080    it will give you number of sockets active on a specific IP and port Server port number

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This will help you  netstat -atn   grep  lt port no gt             For tcp netstat -aun   grep  lt port no gt              For udp netstat -atun   grep  lt port no gt             For both

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Here is the easy solution of port finding     In cmd   netstat -na   find  8080    In bash   netstat -na   grep  8080    In PowerShell   netstat -na   Select-String  8080

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For port 80  the command would be   netstat -an   find  80   For port n  the command would be   netstat -an   find  n   Here  netstat is the instruction to your machine   -a   Displays all connections and listening ports -n   Displays all address and instructions in numerical format   This is required because output from -a can contain machine names   Then  a find command to  Pattern Match  the output of previous command

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when I have problem with WAMP apache   I use this code for find which program is using port 80  netstat -o -n -a   findstr 0 0 80   3068 is PID  so I can find it from task manager and stop that process

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Use the lsof command  lsof -i tcp port     here is an example      lsof -i tcp 1555  COMMAND   PID USER   FD   TYPE   DEVICE SIZE OFF NODE NAME java    27330 john  121u  IPv4 36028819      0t0  TCP 10 10 10 1 58615- gt 10 10 10 10 livelan  ESTABLISHED  java    27330 john  201u  IPv4 36018833      0t0  TCP 10 10 10 1 58586- gt 10 10 10 10 livelan  ESTABLISHED  java    27330 john  264u  IPv4 36020018      0t0  TCP 10 10 10 1 58598- gt 10 10 10 10 livelan  ESTABLISHED  java    27330 john  312u  IPv4 36058194      0t0  TCP 10 10 10 1 58826- gt 10 10 10 10 livelan  ESTABLISHED

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You can use the netstat combined with the -np flags and a pipe to the find or findstr commands   Basic Usage is as such   netstat -np  lt protocol gt    find  port      So for example to check port 80 on TCP  you can do this  netstat -np TCP   find  80  Which ends up giving the following kind of output   TCP    192 168 0 105 50466    64 34 119 101 80       ESTABLISHED TCP    192 168 0 105 50496    64 34 119 101 80       ESTABLISHED   As you can see  this only shows the connections on port 80 for the TCP protocol

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I use   netstat    aon   find   lt port number gt     here o represents process ID   now you can do whatever with the process ID   To terminate the process  for e g   use   taskkill  F  pid  lt process ID gt

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This command will show all the ports and their destination address   netstat -f

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In RHEL 7  I use this command to filter several ports in LISTEN State   sudo netstat -tulpn   grep LISTEN   egrep   8080  8082  8083   etc

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To improve upon  EndUzr s response   To find a foreign port  IPv4 or IPv6  you can use   netstat -an   findstr  r  c   N           To find a local port  IPv4 or IPv6  you can use   netstat -an   findstr  r  c   N                  Where N is the port number you are interested in  The   r  switch tells it to process it as regexp  The   c  switch allows findstr to include spaces within search strings instead of treating a space as a search string delimiter  This added space prevents longer ports being mistreated - for example    80  vs   8080  and other port munging issues   To list remote connections to the local RDP server  for example   netstat -an   findstr  r  c   3389                 Or to see who is touching your DNS   netstat -an   findstr  r  c   53                 If you want to exclude local-only ports you can use a series of exceptions with   v  and escape characters with a backslash   netstat -an   findstr  v  0 0 0 0 127 0 0 1            1             findstr  r  c   80

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It will give you all active sockets on a specific IP  netstat -an   find  quot 172 20 1 166 quot

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As noted elsewhere  use netstat  with appropriate switches  and then filter the results with find str   Most basic   netstat -an   find   N    or  netstat -a -n   find   N    To find a foreign port you could  use   netstat -an   findstr   N          To find a local port you might use   netstat -an   findstr   N             Where N is the port number you are interested in   -n ensures all ports will be numerical  i e  not returned as translated to service names   -a will ensure you search all connections  TCP  UDP  listening      In the find string you must include the colon  as the port qualifier  otherwise the number may match either local or foreign addresses   You can further narrow narrow the search using other netstat switches as necessary     Further reading   0    netstat     find     findstr

User · Answer

For Windows 8 User   Open Command Prompt  type netstat -an   find  your port number    enter     If reply comes like LISTENING then the port is in use  else it is free

[windows] Command line for looking at specific port

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