ss(8)
ss [option] [filter]
[option]
-p ..... Show process using socket
-l ..... Show sockets in listening state
-4/-6 .. Show IPv4/6 sockets
-x ..... Show unix sockets
-n ..... Show numeric ports (no resolve)
-O ..... Oneline output per socket
[filter]
dport/sport PORT .... Filter for destination/source port
dst/src ADDR ........ Filter for destination/source address
and/or .............. Logic operator
==/!= ............... Comparison operator
(EXPR) .............. Group exprs
Examples
Show all tcp IPv4 sockets connecting to port 443
:
ss -4 'dport 443'
Show all tcp IPv4 sockets that don't connect to port 443
or connect to address 1.2.3.4
.
ss -4 'dport != 443 or dst 1.2.3.4'