root@slack:~# nmap -P0 -O 201.88.38.51

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2007-03-20 04:47 AMT
Interesting ports on 201-88-38-51.pvoce701.dsl.brasiltelecom.net.br (201.88.38.51):
Not shown: 1657 closed ports
PORT      STATE    SERVICE
21/tcp    filtered ftp
23/tcp    filtered telnet
25/tcp    filtered smtp
37/tcp    filtered time
69/tcp    filtered tftp
80/tcp    filtered http
113/tcp   filtered auth
135/tcp   filtered msrpc
137/tcp   filtered netbios-ns
138/tcp   filtered netbios-dgm
139/tcp   filtered netbios-ssn
161/tcp   filtered snmp
445/tcp   filtered microsoft-ds
593/tcp   filtered http-rpc-epmap
631/tcp   open     ipp
1080/tcp  filtered socks
1433/tcp  filtered ms-sql-s
1434/tcp  filtered ms-sql-m
3128/tcp  filtered squid-http
4444/tcp  filtered krb524
6000/tcp  open     X11
12345/tcp filtered NetBus
12346/tcp filtered NetBus
Device type: general purpose
Running: Linux 2.6.X
OS details: Linux 2.6.5 - 2.6.11

Nmap finished: 1 IP address (1 host up) scanned in 51.763 seconds