1:1 was a project created in 1999 that consisted of a database that would eventually contain the addresses of every web site in the world and interfaces through which to view and use the database. Crawlers were sent out on the web to determine whether there was a web site at a specific numerical address. If a site existed, whether it was accessible to the public or not, the address was stored in the database. However, the web was changing faster than the database was updated and in 2001 it was clear that the database was outdated. Migration is a continuation of the project including a second and third database of addresses generated in 2001/2002 and 2005 and an interface that compares the three databases.