Affects Version/s: Minecraft 1.5.1
Fix Version/s: None
Environment:Minecraft version: 1.5.1
Oracle JRE version: 1.7.0_21 (x64)
Operating system: Ubuntu 10.04 x64
$ dig +short SRV _minecraft._tcp.whatevercraft.com
0 5 25565 server.whatevercraft.com.
$ dig +short A server.whatevercraft.com
The Minecraft client does not query the DNS recursor for a SRV record.
A look at the DNS queries (using Wireshark) shows that the current Minecraft client (1.5.1) only queries for AAAA- and A-records but not for a SRV-record.
This bug has been reported a couple of times before and marked as "Fixed" in
MC-6941. It's not fixed.