show listening processes ports macOS quickly:
netstat -Waltn | grep tcp
Still fast but show every internet port with no DNS lookups:
netstat -Waltn | grep -E "(tcp|udp)(4|6)"
Like above but with DNS lookups but takes literally forever up to minutes:
netstat -Walt | grep -E "(tcp|udp)(4|6)"
Show only servers - that is ports that are listening waiting for an inbound connection:
netstat -Waltn | grep LISTEN
The Little Snitch Command - Who's phoning home?
How to use LSOF to discover which app or process is listening to which ports:
lsof -Pnl +M -i -cmd | grep -E "LISTEN|TCP|UDP"
I prefer to use -n to speed up the listing of netstat results by turning off DNS lookups ip to name resolution. The l is used to also show ipv6. To show all internet connections, whether ipv4 or ipv6, tcp or udp, listening, connected or closing - the lot:
netstat -Waltn | grep p
Show only TCP connections:
netstat -anp tcp
To see which apps have listening sockets open:
sudo lsof -n -P | grep LISTEN
Some other good linux ones here: http://www.commandlinefu.com/commands/matching/netstat/bmV0c3RhdA==/sort-by-votes
Show Process ID in Netstat Mac
Actually, you can't but you can use LSOF which lists open files and sockets:
lsof -Pnl +M -i
Use -i4 for ip4 and -i6 for ip6. -i seems to work for all internet traffic.
sudo netstat -tulpnPosted by tomachi on January 12th, 2016 filed in Mac, Unix