Problem with Parallels IP addresses on network

I run static IPs on my home network, (198.168.n.n) and have been assigning them to clients via the MAC address that the Parallels client preference panel shows. This has been working fine, except that I've been getting other IPs in the 10.37.n.n range from Parallels that I cannot track down to shut down. I have DHCP set off on these clients and the main Parallels preference panel. Where else can I look, and/or what further info can I provide?