Simple Port Scan with NMap
Port Scan's don't only need to be the tool for hackers, they area a handy tool for a network or server administrator. Especially when debugging firewall issues. For example want to see which TCP ports www.google.com has open?
nmap -sT www.google.com
The output of the simple example above might look something like this:
Interesting ports on py-in-f104.google.com (220.127.116.11): (The 1657 ports scanned but not shown below are in state: filtered) PORT STATE SERVICE 80/tcp open http 179/tcp closed bgp 443/tcp open https Nmap run completed -- 1 IP address (1 host up) scanned in 31.619 seconds
That shows port 80, 179, and 443 open, so if your trying to ssh into google.com you won't get very far.
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Simple Port Scan with NMap was first published on March 14, 2007.