Find open ports in Windows

From http://www.techrepublic.com

http://www.techrepublic.com/blog/security/list-open-ports-and-listening-services/443

Microsoft Windows XP

Microsoft Windows also offers anetstatcommand that can be executed from the command line to get a list of open ports. The standard MS Windows version ofnetstatis slightly more limited than its Unix-like system counterparts, but still suffices to get a listing of listening services:

  netstat -a | find "LISTENING"

The output of this command should look something like this:

TCP    hostname:epmap           hostname:0               LISTENING
TCP    hostname:microsoft-ds    hostname:0               LISTENING
TCP    hostname:10110           hostname:0               LISTENING
TCP    hostname:netbios-ssn     hostname:0               LISTENING

. . . with “hostname” replaced by the system’s hostname, of course.