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 188.8.131.52: (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#
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