The IP you posted from is listed on dronebl, marking it as a system that was used as an IRC spam drone (litmus/sdbot/fyle). Since this indicates malicious activity we block players from IPs that are on this list automatically, which is why this IP is banned on our servers.
However, if you use
https://dronebl.org/lookup on your IP you can see that the entry is from 2017. If that's a dynamic IP range this probably doesn't apply to you. Your best bet is to request removal there, mentioning that it's a dynamic IP and the record from 2017 doesn't apply to you. I don't see any reason why they should reject this request. After they removed it you should be able to join our servers again (with some delay though).