Every networking device we use like a router, extender, switch or any other, each of it have a default IP address assigned to it from its manufacturer. We could change that IP address later on if we want to after setting up that particular device. The Netgear wireless range extender do have its own default IP address that is being assigned by Netgear. The default IP address of Netgear wireless range extender is 192.168.1.250. There are several uses of the IP address of a Netgear wireless range extender.

IP address could be used to initiate the web browser setup

We could setup the Netgear wireless range extender either using the web browser setup or wireless protected setup. If, we ant to setup the Netgear wireless range extender using the web browser setup, we have to put www.mywifiext.net on the address bar of any web browser of a desktop computer or a laptop. But sometimes we are not lucky enough and when we try to search www.mywofext.net, we are not able to reach the setup. It could be due to many reasons like some settings on our computer or it could be due to the web browser itself that we are using to initiate the Netgear wireless range extender.
http://mywifiext.world/what-is-the-default-ip-address-of-netgear-extender-and-whats-its-use/