Database that netflix/hulu use to determine who is a proxy and who isnt?

[Drew Weaver <drew.weaver () thenap com>]

It seems like recently one of the sources for IP info that Netflix and Hulu uses was updated with erroneous information 
as access to both of the services was revoked pretty much at the same time.

Does anyone know what source they use for that information so I can request that they fix some of their information?

Thanks,
-Drew