You would type 192.168.1.128 directly in your web browser to login the admin interface.
Some people do that as they find it easier to remember than some other numbers but otherwise it provides no particular benefit over other address choices.
An administrator can choose to assign 192.168.100.1 to a different device on the local network other than the router.
Administrators can log into the console of a router set for 192.168.100.1 by pointing a Web browser to For more, see - How to Access Your Router at Home.
Administrators can easily change a home router's addresses from some other default to 192.168.100.1 if they prefer to use this number.
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