The SAN agency offers a free lookup tool at http://isbn.org/san_lookup that lets you check the address associated with a known SAN number.

Publishers, if you need to know the SAN number of a particular bookstore, you can:

• Contact MVB to see if the store is registered with us
• Contact the store directly

Bookstores, if you aren't sure if you have a SAN number or don't remember what it is, please call the ISBN-SAN Agency at 1-877-310-7333.