Searching for an LLC in Arizona? Try the Arizona Secretary of State and visit their corporation search page. You can search by filing number, agent name, or registered LLC name. It also includes instructions on how to search for any Arizona LLC (or other kind of corporation!) and all of the information is accessible for free to the public.
Once you locate the LLC you are looking for, you can check if it is in good standing and even print out a Certificate of Good Standing.
If you are looking to start a company in Arizona and need to register an LLC, try an online service like incorporate.com, which can get you up and running in no time.