# nmap -P0 71.164.120.121

Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2007-03-29 11:34 EST
Interesting ports on pool-71-164-120-121.albyny.east.verizon.net (71.164.120.121):
(The 1656 ports scanned but not shown below are in state: filtered)
PORT     STATE  SERVICE
22/tcp   open   ssh
993/tcp  open   imaps
995/tcp  open   pop3s
1503/tcp closed imtc-mcs