sudo lsof -i :80


COMMAND   PID     USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
nginx    6346     root    6u  IPv6 15423161      0t0  TCP *:http (LISTEN)
nginx    6348 www-data    6u  IPv6 15423161      0t0  TCP *:http (LISTEN)
nginx   12503     root    6u  IPv4   468507      0t0  TCP *:http (LISTEN)
nginx   12548 www-data    6u  IPv4   468507      0t0  TCP *:http (LISTEN)

sudo lsof -i :444

COMMAND   PID     USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
nginx    6346     root    7u  IPv6 15423162      0t0  TCP *:https (LISTEN)
nginx    6348 www-data    7u  IPv6 15423162      0t0  TCP *:https (LISTEN)
nginx   12503     root    7u  IPv4   468508      0t0  TCP *:https (LISTEN)
nginx   12548 www-data    7u  IPv4   468508      0t0  TCP *:https (LISTEN)