16

Guys i want to know if my specific port is running a server using netstat? how do i achieve that?

3 Answers3

18

You can use 

netstat -pnlt | grep ':portno'

another option , you can use nmap tool for checking open ports on the server

nmap -sT -O localhost

Output

Starting nmap 3.55 ( http://www.insecure.org/nmap/ ) at 2004-09-24 13:49 EDT
Interesting ports on localhost.localdomain (127.0.0.1):
(The 1653 ports scanned but not shown below are in state: closed)
PORT      STATE SERVICE
22/tcp    open  ssh 
25/tcp    open  smtp
111/tcp   open  rpcbind
Device type: general purpose

Netstat Example :

[root@krizna ~]# netstat -pnlt | grep ':80'
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name 
tcp        0      0 :::80                       :::*                        LISTEN      1164/httpd
krizna
  • 361
  • 1
  • 4
  • and what part there in the results i can determine if it is a server? –  May 31 '13 at 07:50
  • Check the netstat example part, port :::80 is shown under local address which is LISTENING ( i mean open ). –  May 31 '13 at 08:14
  • It is worth mentioning that the grep ':portno' may also pick up some IPv6 addresses that happen to contain that sequence. That can be a problem if you try to use this command in a script. – Kevin Keane Aug 27 '18 at 18:54
2

use netstat -anp | grep portNumber

rags
  • 121
  • 5
  • so im getting list of many port 80 connections. how do i find the server port? –  May 31 '13 at 06:10
2

I think netstat -nat | grep port | grep LISTEN should do the trick.

  • This is listing all ports, and then grep for listening ports. Instead it should just show the listening ports with `-l` instead of `-a`. And the question was not only about tcp ports so the `-t` option shouldn't be there. – Paul Tobias Mar 24 '16 at 08:17