[root@darkstar ~]# nmap -P0 82.174.2.80

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2008-04-07 10:33 CDT
Interesting ports on cust-80-2.dsl.versateladsl.be (82.174.2.80):
Not shown: 1667 closed ports
PORT     STATE    SERVICE
20/tcp   filtered ftp-data
21/tcp   filtered ftp
23/tcp   filtered telnet
80/tcp   filtered http
135/tcp  filtered msrpc
136/tcp  filtered profile
137/tcp  filtered netbios-ns
138/tcp  filtered netbios-dgm
139/tcp  filtered netbios-ssn
443/tcp  filtered https
445/tcp  filtered microsoft-ds
1720/tcp filtered H.323/Q.931
5900/tcp open     vnc