routerlogin.net 404 error

I am having issues with routerlogin.net, where whenever I attempt to access the website it gives me an error stating

404 Not Found

This server does not support the operation requested by your client.

I also tried putting my router IP in the url bar but that lead to pages not being found. I tried both 192.168.1.1 and 192.168.0.1, but neither could be reached. I found my router's actual IP by going into command prompt and putting in the ipconfig command, and it was 216.16.48.1 but putting that in the url bar came up with the same error as before. I confirmed that this was the correct IP on my phone too.

I also tried to clear my cache and cookies on my browser (I've tried both google chrome and edge) but to no avail. Trying it on other devices came up with similar results. I don't have anything with me that has an ethernet port so trying a wired connection isn't in the cards at the moment. 

I'm flat out of ideas on how else to make this work, I've been trying to access it for an hour and a half by now. The only thing I can think of that may have messed things up is that I just unplugged a wifi extender that has been plugged in since before this router was installed, but I'm unsure as to if that would change anything. Thanks for any and all help