Each line of the translation file is in one of the following forms (domain_name should be of the form .XXX.YYY, e.g. .LCS.MIT.EDU):
host_name kerberos_realm domain_name kerberos_realmIf a hostname exactly matches the host_name field in a line of the first form, the corresponding realm is the realm of the host. If a hostname does not match any host_name in the file, but its domain exactly matches the domain_name field in a line of the second form, the corresponding realm is the realm of the host.
If no translation entry applies, the host's realm is considered to be the hostname's domain portion converted to upper case.