An apparatus comprising: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: determining (902) that availability information relating to (i) a specific resource associated with a specific network slice, (ii) a specific resource associated with a specific subnetwork and a specific network slice or (iii) a specific resource associated with a specific service and a specific network slice is to be requested by a first entity; and causing (904) a request for availability information to be sent by the first entity to a second entity.