Use case: Hosting multiple minecraft servers on one Server with the same IP.

Therefore you can use SRV-records:

Add a DNS record with the following scheme to at your DNS:

_service._proto.name. TTL class SRV priority weight port target

For example this can look like this:

_minecraft._tcp.sub1 86400 IN SRV 0 5 5060 sub1.example.com

Sourced partially from stackoverflow.com - Redirect DNS to different ports