192.168.1.1 is a private IPv4 network address. Any brand of network router, or any computer on a local network for that matter, can be set to use this address. As with any IP address, however, only one device on the network should use 192.168.1.1 to avoid address conflicts.
See also - 192.168.0.1, 192.168.1.100, 192.168.2.1

