Can I keep my numerical IP address? (e.g. 192.0.2.1)

Unfortunately, it is highly unlikely that you will receive the same numerical IP address. IP addresses are a finite resource and are constantly recycled between providers.

What about my custom hostname? (e.g. cubed.mymc.io)

The domain we used, mymc.io, was a CubedHost asset that has since been sold.

Can I buy my own domain?

Of course! Anyone can purchase a domain at any time and connect it to their game servers. If you're looking to purchase a domain, be sure that the registrar you use offers DNS management; otherwise, you won't be able to set up the appropriate records to connect your domain to your servers.

Are there any companies you recommend for domains?

CubedHost used Porkbun, Cloudflare, Namecheap, and Google Domains.

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