If you want active scanning, http://portscan.me/ will do a reverse nmap port scan of whatever requests it.
Scanning {ip} for interesting ports on 2020-09-22 20:14:00 CEST…
This may take a short while.
Starting Nmap 5.21 ( http://nmap.org ) at 2020-09-22 20:14 UTC
Initiating Ping Scan at 20:14
Scanning {ip} [2 ports]
Stats: 0:00:01 elapsed; 0 hosts completed (0 up), 1 undergoing Ping Scan
Ping Scan Timing: About 50.00% done; ETC: 20:14 (0:00:01 remaining)
Stats: 0:00:02 elapsed; 0 hosts completed (0 up), 1 undergoing Ping Scan
Ping Scan Timing: About 50.00% done; ETC: 20:14 (0:00:02 remaining)
Stats: 0:00:03 elapsed; 0 hosts completed (0 up), 1 undergoing Ping Scan
Ping Scan Timing: About 99.99% done; ETC: 20:14 (0:00:00 remaining)
Completed Ping Scan at 20:14, 3.00s elapsed (1 total hosts)
Nmap scan report for {ip} [host down, received no-response]
Read data files from: /usr/share/nmap
Note: Host seems down. If it is really up, but blocking our ping probes, try -PN
Nmap done: 1 IP address (0 hosts up) scanned in 3.07 seconds
The scan was performed from 89.186.169.101. Best regards gigahost.dk
OP's link archived from archive.fo
What should I do?