Pete Freitag Pete Freitag

Simple Port Scan with NMap

Published on March 14, 2007
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 has open?

nmap -sT

The output of the simple example above might look something like this:

Interesting ports on (
(The 1657 ports scanned but not shown below are in state: filtered)
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 you won't get very far.

Simple Port Scan with NMap was first published on March 14, 2007.

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