SERVER IP

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I am just thinking about a question is there any wary to change [ServerName].aternos.me to [ServerName].tk because if we want to buy a domain and use it on our aternos servers

this is not possible and it won't be soon either.

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My second question is why the website https://topminecraftservers.org is not accepting aternos servers

I see a lot of aternos server's advertised there and there terms do not mention that you can't advertise servers from aternos. Next time ask these questions to them though.

if you mean an ip like play.example.me, no.

Most server server are likely to be offline, so advertising there is not helpful, at least for me