Although it is not all routers in the world, it is designed to access "192.168.1.1" by web browser when opening the setting screen with many routers. So, why this URL is "192.168.1.1", detailed answer ...
By default, the network's gateway (typically a router), will be assigned an IP address of 192.168.0.1. The network, then, assigns addresses ranging from 192.168.0.2 to 192.168.0.254 to other computers ...