check open ports (both ipv4 and ipv6)

netstat -plnt
While `lsof` will work, why not use the tool designed explicitly for this job? (If not run as root, you will only see the names of PID you own)
Sample Output
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0  *               LISTEN      13443/apache2   
tcp        0      0    *               LISTEN      801/sshd        
tcp6       0      0 :::25565                :::*                    LISTEN      1249/java       
tcp6       0      0 :::6667                 :::*                    LISTEN      12101/bitlbee   
tcp6       0      0 :::22                   :::*                    LISTEN      801/sshd        

By: DopeGhoti
2011-09-30 19:56:32

13 Alternatives + Submit Alt

  • This command is more portable than it's cousin netstat. It works well on all the BSDs, GNU/Linux, AIX and Mac OS X. You won't find lsof by default on Solaris or HPUX by default, but packages exist around the web for installation, if needed, and the command works as shown. This is the most portable command I can find that lists listening ports and their associated pid. Show Sample Output

    lsof -Pan -i tcp -i udp
    atoponce · 2010-06-07 15:22:44 0
  • Tested in Linux and OSX Show Sample Output

    lsof -Pni4 | grep LISTEN
    evenme · 2009-08-21 22:51:41 13

  • 4
    nmap -p 1-65535 --open localhost
    solarislackware · 2009-12-10 20:03:37 0

  • 4
    lsof -Pn | grep LISTEN
    pykler · 2011-09-29 18:21:51 0

  • 3
    sudo lsof -P -i -n -sTCP:LISTEN
    OJM · 2009-12-11 07:16:54 0

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: