BT1 is at the IP address, 199.201.145.187.
A whois lookup on that IP address will show that it is owned by "L0pht Heavy Industries," which was a hacker group (see the above Wikipedia link):
http://www.dnsstuff.com/tools/whois....99.201.145.187
I'm not sure what that means, since the group is supposed to be defunct.
John