Apparatuses, methods, and systems are disclosed for selecting a non-3GPP access network using announced supported S-NSSAIs. One apparatus includes a transceiver and a processor that decides to connect with a first network slice in a first Public Land Mobile Network via a non-3GPP access network. The transceiver sends a first request to each N3AN in a first list of N3ANs, the first request requesting cellular network information, and receives a first response from at least one N3AN in the first list of N3ANs. The processor constructs a second list of N3ANs based on the first response and selects a first N3AN from the second list of N3AN. The transceiver sends a registration request to the first PLMN via the first N3AN, where the registration request indicates that registration with the first network slice is required.