Methods, systems, and computer readable media for using a signaling message routing node to provide a backup subscriber information management service are disclosed. According to one method, a signaling message routing node obtains information associated with a subscriber. The signaling message routing node receives a first subscriber information management message including a message destination and being associated with the subscriber. The signaling message routing node determines whether the message destination is operable to process the first subscriber information management message. If the message destination node is operable to process the first subscriber information management message, the signaling message routing node routes the first subscriber information message to the message destination. If the message destination is not operable to process the first subscriber information management message, the signaling message routing node responds to the first subscriber information management message on behalf of the message destination.