user@fony:~$ netstat --inet -anp | grep 6543
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 0.0.0.0:6543            0.0.0.0:*               LISTEN     -
tcp       30      0 127.0.0.1:6543          127.0.0.1:51965         CLOSE_WAIT -
tcp       30      0 127.0.0.1:6543          127.0.0.1:51964         CLOSE_WAIT -