1 min
nmap
Nmap ("Network Mapper") is a free and open source utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.
nmap is a network discovery tool and can be used to perform a port scan, among other things. For example:
$ nmap -Pn --top-ports 100 192.168.1.1
Starting Nmap 7.95 ( https://nmap.org ) at 2024-10-27 18:59 CET
Nmap scan report for 3eefad8135fb448caa291b6950802356.fritz.box (192.168.1.1)
Host is up (0.19s latency).
Not shown: 97 closed tcp ports (conn-refused)
PORT STATE SERVICE
22/tcp open ssh
111/tcp open rpcbind
2049/tcp open nfs
Nmap done: 1 IP address (1 host up) scanned in 0.02 seconds