Abstract: The invention is a method and system of updating address data representative of a changed address. Updates are accomplished by initiating an address data request at a client system. The request is transmitted to an application host system where it is translated into a format readable by a master system comprising change of address files. The interface between the application host system and the master system includes a translation step. The translation step begins by creating a data map representative of the address data request. The created data map is compared against either a mailing list correction (MLC) scheme or a multi-line optical character reader (MLOCR) scheme to establish a second data map representative of the address request. The second data map is then transmitted via a SCSI interface to the master system for processing of the address request. The master system matches the address data request to records of address changes to determine whether a match exists.