192.168.1.1 is the default IP address for a router device such as linksys, it can be changed. This IP address is part of factory settings, depending on a user’s preferences.
The password of this address will be different according to the router manufacturers' set. It's default User name: admin, password: admin.
Not only broadband routers can use this IP address, Printer or other device can be set up to use 192.168.1.1 instead of a router.
192.168.1.1 can also be used by more than one user that in different networks, unlike public IP addresses that every computer on the Internet has to have a unique IP. In a network every machine also has to have a unique IP address, and there can’t be two machines with the same IP in one network.