nmap – Network exploration tool and security / port scanner

commandline session

$nmap --reason 127.0.0.1

Starting Nmap 6.00 ( http://nmap.org ) at 2013-09-06 21:58 IST
Nmap scan report for localhost.localdomain (127.0.0.1)
Host is up, received conn-refused (0.0013s latency).
Not shown: 995 closed ports
Reason: 995 conn-refused
PORT     STATE SERVICE REASON
22/tcp   open  ssh     syn-ack
25/tcp   open  smtp    syn-ack
111/tcp  open  rpcbind syn-ack
389/tcp  open  ldap    syn-ack
1094/tcp open  rootd   syn-ack

Nmap done: 1 IP address (1 host up) scanned in 0.39 seconds
$