Windows 2k server, DC with DNS installed. Clients use DHCP. When I look at DNS it shows anywhere from 1 (which I would expect) to 4 different computer names for 1 IP address (internal addresses, 10.1....). Why is DNS not releasing these? I just tested one. I had a PC that hasn't been turned on in a while which was one of the multiple address PC's. I booted it up and it grabbed a new address through DHCP. I looked in DNS and it removed the old address and listed it under the new address (which it now shares with another old PC).