Guys i want to know if my specific port is running a server using netstat? how do i achieve that?
3 Answers
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
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and what part there in the results i can determine if it is a server?– MonkeyMay 31, 2013 at 7:50
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Check the netstat example part, port :::80 is shown under local address which is LISTENING ( i mean open ).– kriznaMay 31, 2013 at 8:14
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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. Aug 27, 2018 at 18:54
use netstat -anp | grep portNumber
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so im getting list of many port 80 connections. how do i find the server port?– MonkeyMay 31, 2013 at 6:10
I think netstat -nat | grep port | grep LISTEN
should do the trick.
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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. Mar 24, 2016 at 8:17