For finding out if something is listening on a port and if so what the daemon is.

lsof -i :[port number]
Gives also the name of the deamon
Sample Output
$ sudo lsof -i :443
apache2 1018     root    5u  IPv4   4121      0t0  TCP *:https (LISTEN)
apache2 1044 www-data    5u  IPv4   4121      0t0  TCP *:https (LISTEN)

By: CodSpirit
2010-08-20 11:14:11

3 Alternatives + Submit Alt

What Others Think

When I use it with port 80, it shows me all the processes that are sending requests using that port (Chrome for example) but not the ones listening. Any idea why?
imgx64 · 612 weeks and 3 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: