[yz@localhost ~]$ lsof -i TCP:1-7404
COMMAND    PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
postgres 17442   yz    5u  IPv6 824828      0t0  TCP localhost:7404 (LISTEN)
postgres 17442   yz    6u  IPv4 824829      0t0  TCP localhost:7404 (LISTEN)