I have e-commerce site - let's name it www.goodurl.com - where all first-time visitors being sent to different site - let's name it filter-service.com - which split/filter traffic for my e-commerce site and return it back to different pages - like this: 1) first-time visitors of my e-commerce site being sent to *single* remote URL - like http://filter-service.com/check-me (there are many URLs for different sites - like http://filter-service.com/check-me-for-different-site ); 2) remote system (http://filter-service.com/) appraise country of origin of visitor (sometimes - state-city-zip) and people from EU being sent back to e-commerce site to a page with special offer for EU (like goodurl.com/eu-offer), US traffic being sent to $$$-related offer (goodurl.com/us-offer), others being redirected directly to FBI site as potential hackers. Just kidding. I couldn't implement IP check on my e-commerce site because IP database has 4 millions strings (zip/cities/states) and it could slow down "e-commerce server" (smaller databases lacking precision). System has simple interface (child can use it) and allow to make/add rules like "visitors from LA goes to www.goodurl.com/surfing-offers" + "guys from London will be redirected to page www.goodurl.com/discounted-umbrellas" in few seconds. Sure thing "filter-service.com" keep tracks of all visitors + visitors of goodurl.com don't have any clues they are being redirected to different site and back (redirects are very fast). How do you think - can you use this service? At the moment it's private but I'm thinking to make it public.