The router is a router+WAP so it has an internal WAP. The router will have an IP address for its main side (in my case the external connection to the Internet) and one for its LAN side so things on the LAN can see it as the gateway. If this is a linksys device the LAN side is normally 192.168.1.1. The built in WAP may not have an explicit IP as the only thing that talks to it is the Router nd that can then be managed internally.

Think of the internal WAP not being "On the network" but in a symbiotic relationship with the Router. It does not need an IP address as would be the case of a WAP this is connected to the network explicitly.