lsof -i -P

sudo lsof -i -P
 sudo lsof -i -P | grep "80 (LISTEN)"

sudo lsof -i -P | head -10
COMMAND     PID           USER   FD   TYPE             DEVICE SIZE/OFF   NODE NAME
launchd       1           root    8u  IPv6 0xfd30de9ad1b2011d      0t0    TCP *:22 (LISTEN)
launchd       1           root    9u  IPv4 0xfd30de9acfce9235      0t0    TCP *:22 (LISTEN)
launchd       1           root   22u  IPv4 0xfd30de8c6ad4a9dd      0t0    UDP *:138
launchd       1           root   23u  IPv6 0xfd30de9ad1b2011d      0t0    TCP *:22 (LISTEN)
launchd       1           root   24u  IPv4 0xfd30de9acfce9235      0t0    TCP *:22 (LISTEN)
launchd       1           root   25u  IPv4 0xfd30de8c6ad565dd      0t0    UDP *:67
launchd       1           root   31u  IPv4 0xfd30de8c6ad4addd      0t0    UDP *:137
launchd       1           root   40u  IPv6 0xfd30de9ae1ebe11d      0t0    TCP *:50051 (LISTEN)
launchd       1           root   46u  IPv4 0xfd30de9acc7b627d      0t0    TCP *:50051 (LISTEN)

See also

• lsof,strace, auditctl, fuser
• launchd, launchctl, plist, example.plist