There is a free registry where you can keep your info up to date even after your year with other companies. I have all of my dogs microchips put into that as well as the site their chips came with in the hopes that someone will check there if they can't find them through the regular chip site.
Found Animals Pet Care, Spay & Neuter, Adopt a Dog & Cat, Pets Jobs LA
You just make a profile on there and then you can enter all your animals chips into it no matter what company made them. It is nice to have them all in one place as some of my animals have chips made by different manufacturers.