Speeding Your Scans -- Firewalled Hosts

Now let's try with -T4 ("Aggressive"):

 # ./nmap -P0 -T4 www.insecure.org
Starting nmap 3.15BETA3 ( www.insecure.org/nmap/ ) at 2003-03-16 12:57 PST
Interesting ports on www.insecure.org (64.71.184.53):
(The 1605 ports scanned but not shown below are in state: filtered)
Port       State       Service
22/tcp     open        ssh
25/tcp     open        smtp
53/tcp     open        domain
80/tcp     open        http
113/tcp    closed      auth
8080/tcp   closed      http-proxy
Nmap run completed -- 1 IP address (1 host up) scanned in 40.865 second