Simple Port Scan with NMap
By Pete Freitag
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 (18.104.22.168): (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.
Simple Port Scan with NMap was first published on March 14, 2007.Tweet Follow @pfreitag