whois service

Hi,

I have been looking in the RFCs, but I doesn't seem to be able to find
an exact answer. So I'll try drop the question in here "Must a ccTld
registrar (like dk-hostmaster.dk) supply a whois service?".

The reason I ask, is that whois.dk-hostmaster.dk have been taken our of
service, and they only offer a web interface to the database. This
removes all simple querying of any .dk domain.

Thanks,
  Martin Djernaes