Assuming that the first three characters in your username indicate that you are Microsoft minded, the following advice may be a little off the road ;) but it can be easily done at the command line in Linux:
nslookup subdomain.domain.org.uk
This gives you the IP address of the subdomain. Then you lookup the IP owner details with
whois IP-address
aspdaddy
6:45 pm on Apr 4, 2008 (gmt 0)
Thanks, works in cmd under windows too :) The nslookup did at least, I had to download whois for windows.