Every piece of hardware on your network has a numerical name called an IP address. Think of 192.168.1.250 as the exact GPS coordinates of your Netgear device. It is hard to forget a coordinate, but it is very precise. Because numbers are hard for people to remember, Netgear created mywifiext.net. This is a “local” domain. It acts like a nickname for that long string of numbers. https://mywi-fiext.net/192-168-1-250-vs-mywifiext-net-which-one-should-you-use-for-netgear-setup/