netstat

user@server:/etc/ssh$ netstat -netpula | grep -E ":22"
(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 0.0.0.0:22              0.0.0.0:*               LISTEN      0          2561        -
tcp        0    168 192.168.1.10:22         192.168.1.101:32345     ESTABLISHED 0          19425       -
tcp6       0      0 :::22                   :::*                    LISTEN      0          2563        -