Access to Admin Web Interface using Apples AirPort Extreme 802.11ac?

Hi, I am trying to access my internet providers web panels (Optus NBN FTTP Sydney Australia) usually I would go to https://192.168.0.1

This does not work as I have elected to not use (or pay for) their modem and have instead just plugged straight into the NBN not sure if I was supposed to do that or not but anyway it works cracker for the most part but there is information and configuration options that I need from Optus that neither AirPort Utility application or macOS network preferences offer. Tried the obvious 10.0.1.1 and all of the IP addresses listed for my devices both for LAN and normal nothing....

Contacted Optus my provider they will not assist with third party modems and told me to ask Apple to log me in to their admin site. I have trouble trying to raise a ticket for my own devices that have just had applecare expire and ahhh......this AirPort is now somewhat unsupported (like 15 years old) so Im here to ask the awesome Apple community.

So does anyone know how/or if I can access my providers homepage without the help from my provider from IP 10.0.1.1?

Does anyone know how many and/or what is missing from AirPort Utility and MacOS preferences network?

Are there any applications that can assist me - apart from the Optus app - for more detailed description of network usage and the ability to track named and unknown devices? (currently using 'Net Analyzer Pro' application on IOS)