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.
- relates to
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MC-6941 SRV is no longer used to lookup servers
- Resolved