A server device configured to store an Internet protocol (IP) registry, the registry includes information for a user device, the information includes particular identifiers for the user device, an IP address for the user device, and a particular access point name (APN), where the particular APN corresponds to a service, an application, a network, or data used by the user device; receive a query that includes identifiers and an APN; perform, using the IP registry, an operation to identify the information, for the user device, based on the identifiers and the APN; obtain the information for the user device, when the identifiers match the particular identifiers stored in the IP registry and when the APN matches the particular APN stored in the IP registry; and send, to an application server, the information for the user device, where the IP address permits the application server to communicate with the user device.