This address is a private IP address that you can assign manually (statically) to a computer on the local network. It is a part of reserved IP range for private uses. To avoid address conflicts, do not use 192.168.1.100 as a static IP address if it is also part of the router's DHCP range.
If you are part of some LAN or you have built your own LAN with Linksys router your computer can get assigned 192.168.1.100. 192.168.1.100 IP is not available on internet. If computer with this IP want to connect to internet it must be redirected through a router or another computer.