When user and/or account information is split between different databases located in different application clusters, each application cluster is capable of performing a lookup to determine an identity of the application cluster that has a particular user's information. As a result, if a first application receives a request for a user's information from a software application, and the first application cluster does not itself have the user's information, the first application can determine the identity of a second application cluster that does have the user's information, and the first application cluster can refer the requesting software application to the second application cluster.