A program to find out what port a program is using?

[Instan00dles]

I had one before but I cant remember what it is called. Does anyone know what that program is called?

 

[sohcrates]

type "netstat" at a command prompt

 

[Nothinman]

netstat will only tell you what's open, not what has it open.

for Windows grab fport.
For linux type '/usr/sbin/lsof | grep IPv4'

 

[cipher00]

Found here under 'Intrusion Detection'.