192.168.100.3 is the default login IP address used by many manufacturers of wireless routers and modems to access the admin panel.
192.168.100.3 is an IP address in the range 192.168.100.1 - 192.168.100.255.
Home networks use this address range. A router can assign 192.168.100.3 to any device (Ipad, laptop, Home computer, Mobile phone, etc.) of the local network automatically.
The IP range 192.168.100.1 - 192.168.100.255 where the IP 192.168.100.3 is part of is a private ip range
following the standards set by RFC 1918. Addresses like 192.168.100.3 are not allowed in the public Internet.
If the private network needs to connect to the internet, is must use a proxy server or gateway.
As told, the ip 192.168.100.3 is part of a private class C network.
The range of this network is 192.168.0.0 - 192.168.255.255. This make the number of possible IP addresses 65,535.
This range is commonly used on private networks because many routers are configured with 192.168.0.1, 192.168.1.1 or 192.168.100.1 as their default address.
If you connect to this network with your tablet, phone or laptop you get an IP address like 192.168.100.3 in this case.
All routers are accessible through the browser. If your routers IP address is 192.168.100.3, type http://192.168.100.3 in your browser. You will see a login page. Most commonly used usernames and passwords are: "admin", "1234" or "none". Please refer to your route documentation.
If the IP address 192.168.100.3 is not your router IP you can retrieve the router IP with the Ipconfig command (only Windows, for Mac & Linux use ifconfig).
To find your router's IP number, look next to "Default Gateway" (listed last).