Support for DNS to locate KDC/realm has been added via RFE 4814940.

However, currently it is disabled by default. Users need to enable it via
Kerberos configuration settings.

MIT Kerberos has enabled "dns_lookup_kdc" by default.
Solaris Kerberos does not enabled "dns_lookup_kdc" by default.
However, this will be updated soon in Solaris 11.

Java Kerberos should also be updated to enable "dns_lookup_kdc" by default.