$ nmap code.onedev.io -p 6611
Starting Nmap 7.92 ( https://nmap.org ) at 2022-08-07 05:58 CEST
Nmap scan report for code.onedev.io (35.161.22.128)
Host is up (0.20s latency).
rDNS record for 35.161.22.128: ec2-35-161-22-128.us-west-2.compute.amazonaws.com
PORT STATE SERVICE
6611/tcp filtered unknown
Nmap done: 1 IP address (1 host up) scanned in 2.26 seconds
The port appears to be closed: