If you don't know how to find the default username and password of your router, then you can follow this guide to retrive them.
technical
Alphabetically Arranged List of Popular Router Brands
There are hundreds of router brands worldwide, and in this guide, I've shared the list of 470+ router brands arranged in alphabetically order.
technical
List of Popular Gateway IP Addresses
There are hundreds or IP addresses that is used inside a local area network. If you're not aware of any of the gateway IP addresses, then here is a list of top gateway IP addresses!