I guess we can't use time.ucla.edu unless we have an account there: nmap -p123 time.ucla.edu Starting Nmap 4.10 ( http://www.insecure.org/nmap/ ) at 2006-09-03 14:15 MST Interesting ports on tick.ucla.edu (164.67.62.194): PORT STATE SERVICE 123/tcp closed ntp Nmap finished: 1 IP address (1 host up) scanned in 1.628 seconds