Where can I find commercial grade IP geolocation webservices?

Question

I need a webservice that will return the country location given an IP address. I only have two requirements:

1. It must be able to take thousands for requests per second.
2. It must be a service where I don't have maintain the data.

I know there are very similar questions here on SO, but most of the stuff people reference violates at least one of my requirements.

Thanks in advance!

Answer 1

http://www.maxmind.com/app/c

Answer 2

Take a look at Quova's Quova-On-Demand service. This is a high-grade service, lots of scale, reliability, availability, etc.