How to know PID responsible for network connection/listen?

Matthias Apitz m.apitz at
Sat Nov 17 06:05:58 PST 2007

El día Thursday, November 15, 2007 a las 11:20:30AM -0800, Yuri escribió:

> 'netstat -a' gives me the listing of network connection/listening records.
> But there's no link to the process id that opened it.
> With lots of processes this can be a significant problem to figure out who
> opened which connection.

For example, for the port 25 you see it with:

# lsof -P | fgrep :25
sendmail  6462  root    3u    IPv4 0xc5c3ecb0        0t0     TCP localhost:25 (LISTEN)

i.e. the PID is 6462


Matthias Apitz
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