If you have bought a home router or access point, you know it comes by default listening to some NAT based IP address, and the setup guide tells the user to type "http://192.168.1.1" or similar into their browser.
Instead, these companies should define a domain, like "setup.linksys.com" that points to a page that redirects to that IP address. In addition, the box, before it is set up, should have a mini DHCP server and DNS server that returns the right address for that domain for people who just plug a PC into the box. (I guess it could return that address for any domain you type in if the box is not configured,n ot just the official one.)
This would serve several purposes. The instructions to the unskilled user become less cryptic. Just plug your PC into the box, boot it and type this easy to remember name into the browser.
If the user is more sophisticated and changes the address of the router, a cookie could be set so the redirect goes to the valid address, but of course if the cookie is lost the user will have to remember, but that's always true. And the user who does not use DHCP from the router will also have to use the numeric address, so it must be printed as an alternative for such folks. But one value of the whole thing is that if it got standardized, it would make it easy to figure out the address for a box if you know the brand. The domain could and should be printed on it. Along with the default password (which should then be changed of course.)