I just remembered my own Minecraft server (version 1.16.5 latest) is still running and unused since 4+ months 
It has some mods installed which might need an update.
If anyone wanna join and test it mc.deadsec.net Port is default 25565 and should not be needed.
Who would be the Admin / OP / Mod? Since they will get access to the web minecraft console. mc.deadsec.net.
Also including a web file browser, web terminal yada yada.