How To Check Open Udp Ports In Linux [Tutorial]

here am sharing method to how to check open udp ports in linux, &  How to check open ports in windows 7 operating systems.
There are two good methods to see what ports are open in Linux you can use
nmap which is a port scanner and you can use netstat.

nmap can be used to scan your machine to see whats ports are open issue the
following command to scan your computers machine:

nmap -sS -O

once the scan has finished you will get the following ouput:

Starting nmap 3.70 ( ) at 2005-01-16 05:48 GMT
Interesting ports on localhost.localdomain (
(The 1656 ports scanned but not shown below are in state: closed)
22/tcp   open  ssh
80/tcp   open  http
443/tcp  open  https
1241/tcp open  nessus
Device type: general purpose
Running: Linux 2.4.X|2.5.X|2.6.X
OS details: Linux 2.5.25 - 2.6.3 or Gentoo 1.2 Linux 2.4.19 rc1-rc7)
Uptime 1.985 days (since Fri Jan 14 06:10:41 2005)

Nmap run completed -- 1 IP address (1 host up) scanned in 2.341 seconds

The second method was netstat. netstat can show hidden ports and what programs using them issue the following command as root:

netstat -nap

This will show you the output of something similar to:

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0   *                   LISTEN      5277/wish
tcp        0      0    *                   LISTEN      3920/mDNSResponder
tcp        0      0      *                   LISTEN      31438/nessusd: wait
tcp        0      0           ESTABLISHED 5062/xchat
tcp        0      0            ESTABLISHED 5277/wish
tcp        0      0                ESTABLISHED 5062/xchat
tcp        0      0 :::80                       :::*                        LISTEN      4355/httpd
tcp        0      0 :::22                       :::*                        LISTEN      32372/sshd
tcp        0      0 :::443                      :::*                        LISTEN      4355/httpd
udp        0      0    *                           3614/dhclient
udp        0      0  *                           3920/mDNSResponder
That's All Enjoy Now.

For Windows 7 Uses Download pd-proxy And you can check open ports with pd-proxy

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