[yz@localhost ~]$ lsof -i
COMMAND    PID USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
node     10444   yz   27u  IPv4 1356954      0t0  TCP localhost:45393->localhost:36542 (ESTABLISHED)
postgres 17442   yz    5u  IPv6  824828      0t0  TCP localhost:7404 (LISTEN)
postgres 17442   yz    6u  IPv4  824829      0t0  TCP localhost:7404 (LISTEN)
postgres 17442   yz    8u  IPv6  824834      0t0  UDP localhost:37288->localhost:37288