Installing nmap on FreeBSD

Nmap ("Network Mapper") is a free open source utility for network exploration or security auditing. It was designed to rapidly scan large networks, although it works fine against single hosts. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. Nmap runs on most types of computers and both console and graphical versions are available. Nmap is free and open source.

To install nmap on FreeBSD server from ports, do

# cd /usr/ports/security/nmap
# make install clean
# rehash

If you want to install from package (binary), run

# pkg_add -r nmap

Now you have nmap installed. To port scan a site or IP with nmap do the following (nmap domain.extn or nmap IP-ADDRESS).

server1# nmap bizhat.com

Starting nmap 3.81 ( http://www.insecure.org/nmap/ ) 
at 2006-07-26 15:47 GMT
Interesting ports on 65.98.61.140:
(The 1654 ports scanned but not shown below are
 in state: filtered)
PORT     STATE SERVICE
21/tcp   open  ftp
25/tcp   open  smtp
53/tcp   open  domain
80/tcp   open  http
110/tcp  open  pop3
143/tcp  open  imap
443/tcp  open  https
3306/tcp open  mysql
3333/tcp open  dec-notes

Nmap finished: 1 IP address (1 host up) 
scanned in 19.783 seconds
server1#