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Is there a way to determine what program is listening to some port, TCP or UDP, in Linux?

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4 Answers

up vote 5 down vote accepted 
netstat -lp

is the command you want, but you need to be root to see all the data.

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Thanks. Didn't thought about reading netstat docs... – whitequark Jan 21 '10 at 15:46
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up vote 2 down vote

ss -tlp

Quicker than netstat.

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nice.. i didnt know about this command.. – shadyabhi Jan 22 '10 at 13:12
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up vote 1 down vote

Take a look at this and this page.

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lsof trick is cool, thanks – whitequark Jan 21 '10 at 15:48
You're welcome. – Mehper C. Palavuzlar Jan 21 '10 at 15:49
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up vote 1 down vote

Already answered, but if it's on a system you don't have a shell on, running nmap -sV -p <port number> <target> will often give you the answer. Add -sU if scanning a UDP port.

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I know about nmap... anyway, I didn't wrote it in question, so +1. – whitequark Jan 24 '10 at 17:33
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