How do i use nmap to scan only 100 ports?
saolasosme last edited by saolasosme
Quote from the nmap man page:
While Nmap is commonly used for security audits, many systems and network administrators find it useful for routine tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.
-F (Fast (limited port) scan) . Specifies that you wish to scan fewer ports than the default. Normally Nmap scans the most common 1,000 ports for each scanned protocol. With -F, this is reduced to 100. Nmap needs an nmap-services file with frequency information in order to know which ports are the most common. If port frequency information isn't available, perhaps because of the use of a custom nmap-services file, Nmap scans all named ports plus ports 1-1024. In that case, -F means to scan only ports that are named in the services file.
This is also called a fast scan or limited scan.
$ nmap -F localhost Starting Nmap 6.40 ( http://nmap.org ) at 2017-03-12 09:34 BST Nmap scan report for localhost (127.0.0.1) Host is up (0.0013s latency). Other addresses for localhost (not scanned): 127.0.0.1 Not shown: 96 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 111/tcp open rpcbind 631/tcp open ipp Nmap done: 1 IP address (1 host up) scanned in 0.03 seconds
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