MLSi stands for Multiple Listing Service. This is a system, usually run and supported by the local Real Estate Board, that has details of almost every home listed for sale with a real estate agent.

It used to be a big giant notebook with paper printouts but today has been computerized in virtually every reaql estate market in the country. Licensed agents (who are current on their local board dues) can submit and search the MLS for homes listed for sale.

Just a few years ago, Realtors were the only people with access to the MLS. But now it's possible for anyone with an Internet connection to search the MLS. There are large national websites with MLS listings, but these are typically out of date. Finding a local Realtors web site is usually the best way to search the MLS. Many Realtors will require you to "register" before you search the MLS. This is a way for the Realtor to capture your name and email address (and maybe more) so they can then "work the lead" that you've just become. Some Realtors do not require registration to search the MLS. You can search the Phoenix area MLS, without registration on our main site (or search the MLS on our blog too!)