I've changed my teamspeak server IP address, and i want switch my rank for the new server.

This is why we have a Guides & FAQs section.

See: How do I migrate player stats or rank between server pages?

I got this message: No available servers
But i have same 2 server

https://www.gametracker.com/server_info/185.30.167.50:9987
https://www.gametracker.com/server_info/54.38.212.46:9987/

Pay attention to that "Use DNS to migrate entire server page" section in the link provided above if you haven't done this yet. I think that's what you need.

That includes editing you old server page settings in GameTracker and adding a domain name for it to automatically resolve to your new server while keeping it's existing rank, NOT adding an entirely new server to GameTracker with a new DNS address because it will count as a new server and your old rank will not be transferred to your new server.

If you are confused with DNS configuration, you can also create extra A records in your domain like ts.4code.net and point it to your new TeamSpeak server IP address and then add that domain address to the old server page here in GameTracker.

I didn't exactly understand what you meant, I did something, but same :/

Problem fixed, thanks.