$ nmap -A -p 22 localhost Starting Nmap 6.40 ( http://nmap.org ) at 2022-07-07 06:13 UTC Nmap scan report for localhost (127.0.0.1) Host is up (0.000028s latency). Other addresses for localhost (not scanned): 127.0.0.1 PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 7.4 (protocol 2.0) | ssh-hostkey: 2048 XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX (RSA) |_256 XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:X