<p>We are implementing an IP based geolocation service, and we need to find some IP's from various markets (LA, NY etc) to fully test the service.</p>

<p>Does anybody know of a directory where we could find what IP ranges are used where?</p>

<p>EDIT: We have already implemented the system, it uses a 3rd party DB and a webservice. We just want some IP's from known markets to verify its working properly.</p>

<p>I'm going to see if I can get what I need from the free maxmind database.</p>

Not sure if cost is a factor but there are a few open source databases knocking about.
This one
claims 99.3% accuracy on its free version with 99.8% for its paid version. They've also got a
Free & Open Source City Database
(76% accuracy at city level).
They're both available as CSV-based databases so you can easily take a known location and get an IP range for ISPs in the area.
The tougher part is getting access to a computer in that IP range.