akashik
Well about the best I think you'll do is to check sites and try to see if they have a demo running on their control panel (which is I presume what you're looking for). Their reseller page offers one example of knightridder though. I checked it and came across these nameservers:
NS.KNIGHT-RIDDER.COM
NS4.CW.NET
I would *presume* the the CW.net nameserver is communitech, though their page says that a business with over 25 sold domains gets a full set of their own nameservers. But checking the whois on a host you think may be from their system might show that nameserver and point you in the right direction... maybe not.
A traceroute that goes through interaccess.com a step or two before their own IP address may be a sign too.
Not a whole lot of help I know.
Greg Moore