port number to application 1

[dandan123]

How do you find out what port is being used by what application ?

When I do a netstat -an | grep -i listen I get a list of open ports but I'm unable to figure out what port is being used by what application. I'm not referring to the "well known ports

 

[Mike042]

A google search for: unix + "port number"
produced over a million hits !!

Here's one link:

http://www.faqs.org/faqs/computer-security/most-common-qs/section-6.html

I hope that helps.

Mike

 

[linnorm]

Try using lsof. lsof -i | grep -i listen should get what you're looking for. You may also grep for a pid or port number too if you're looking for something specific.

 

[dandan123]

Yes I've tried google but I was unable to find info on a lot of ports, for example -

32778

The well known ports are well documented.

 

[dandan123]

Thanks linnorm that was really helpful. I didn't have lsof on the system I was checking but I copied it over from another system.

Are there any issues with having lsof on a box ?

 

[linnorm]

Not that I'm aware of, the man page has some information on security if I remember correctly.