nmap 127.0.0.1
Starting Nmap 7.70 ( https://nmap.org ) at 2019-12-08 17:51 CST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00047s latency).
Not shown: 994 closed ports
PORT     STATE SERVICE
22/tcp   open  ssh
80/tcp   open  http
443/tcp  open  https
5432/tcp open  postgresql
5900/tcp open  vnc
8080/tcp open  http-proxy

Nmap done: 1 IP address (1 host up) scanned in 0.32 seconds