The Netgear Nighthawk X6S WiFi router falls under the list of routers that can be configured as an access point. All you are supposed to do is change some settings by going to routerlogin.net. Mentioned below is the list of routers that you can set up as extenders i.e. you can set them up as an access point. https://nighthawk-setup.net/can-i-use-my-nighthawk-x6s-wifi-router-as-netgear-extender/