Systems, methods, and computer-readable media are provided for inter-network messaging among private and public 5G networks. For instance, a first server on a public 5G mobile network can receive a first message directed to a first wireless device associated with a first network identity. The first server can determine, based on the first network identity, that the first wireless device is associated with a second network identity, wherein the second network identity is used to identify the first wireless device on a private 5G mobile network. The first server can send a copy of the first message to a second server on the private 5G mobile network for transmission to the first wireless device through the private 5G mobile network based on the second network identity.