check open ports (both ipv4 and ipv6)

netstat -plntu
Check open TCP and UDP ports
Sample Output
Proto Recv-Q Send-Q Adresse locale          Adresse distante        Etat        PID/Program name
tcp        0      0*               LISTEN      1284/privoxy    
tcp        0      0*               LISTEN      1901/java       
tcp        0      0*               LISTEN      1546/postgres   
udp        0      0    *                           2028/dhclient   
udp        0      0  *                           1394/avahi-daemon: 
udp        0      0 *                           1394/avahi-daemon: 
udp6       0      0 :::58041                :::*                                1394/avahi-daemon: 
udp6       0      0 :::5353                 :::*                                1394/avahi-daemon: 

By: bolthorn0
2011-10-01 12:16:38

5 Alternatives + Submit Alt

  • Tested in Linux and OSX Show Sample Output

    lsof -Pni4 | grep LISTEN
    evenme · 2009-08-21 22:51:41 19
  • 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) Show Sample Output

    netstat -plnt
    DopeGhoti · 2011-09-30 19:56:32 0

  • 4
    lsof -Pn | grep LISTEN
    pykler · 2011-09-29 18:21:51 0
  • This option selects the listing of all Internet and x.25 (HP-UX) network files. Show Sample Output

    lsof -i
    shsingh · 2011-10-03 02:06:30 0
  • This option is much faster, as it checks only network nodes. Show Sample Output

    lsof -Pi | grep LISTEN
    5partan · 2011-10-03 12:50:18 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?

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