A device may receive, from multiple user devices associated with a shared identifier, registration information that includes a unique identifier for each user device of the multiple user devices, and capability information that identifies one or more capabilities of each user device. The device may store the registration information. The device may receive, from a service provider device, a query associated with providing a service, requiring a particular capability, to at least one of the user devices associated with the shared identifier. The query may include the shared identifier. The device may determine, based on the query and the stored registration information, a set of unique identifiers associated with the shared identifier, and may determine a set of capabilities corresponding to each unique identifier. The device may provide, to the service provider device, information that identifies the set of unique identifiers and the set of capabilities.