Most often, if you’d like to know what your router IP address is, you need to have access to its interface via a browser, or similar such gadgets. Here’s a few convenient one-liners which will give you that info more easily/conveniently…
Find your LAN/WAN/DHCP addresses
![Find your LAN/WAN/DHCP addresses](https://murgatroyd.za.net/wp-content/uploads/2019/07/aid2174570-v4-728px-Check-Ip-Address-in-Linux-Step-8.jpg)
Super cool Mr T