lsof -i :80

lsof -i :80
COMMAND  PID     USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
dropbox 2186   ndavis   25u  IPv4  75996      0t0  TCP Aspire-LT.local:49346->108.160.167.51:http (ESTABLISHED)
apache2 6635     root    3u  IPv4 136312      0t0  TCP *:http (LISTEN)
apache2 6640 www-data    3u  IPv4 136312      0t0  TCP *:http (LISTEN)
apache2 6641 www-data    3u  IPv4 136312      0t0  TCP *:http (LISTEN)
apache2 6642 www-data    3u  IPv4 136312      0t0  TCP *:http (LISTEN)
apache2 6643 www-data    3u  IPv4 136312      0t0  TCP *:http (LISTEN)
apache2 6644 www-data    3u  IPv4 136312      0t0  TCP *:http (LISTEN)
apache2 6651 www-data    3u  IPv4 136312      0t0  TCP *:http (LISTEN)