Understanding the 192.168.1.100 IP Address

192.168.1.100 is the beginning of the default dynamic IP address range for some Linksys home broadband routers. It's a private IP address that can be assigned to any device on a local network that's set up to use this address range. It can also be used as the default gateway IP address.

192.168.1.100 on Linksys Routers

Many Linksys routers set 192.168.1.1 as the default local address and then define a range of IP addresses that are made available to client devices through DHCP (Dynamic Host Configuration Protocol). While 192.168.1.100 is often the default for this setting, administrators are free to change it to a different address, such as 192.168.1.2 or 192.168.1.101.

Some Linksys routers support a Starting IP Address configuration setting that defines which IP address is the first one in the pool from which DHCP allocates addresses. The first computer, phone, or other Wi-Fi connected device using the router is typically assigned this address.

If 192.168.1.100 is chosen as the starting IP address in the pool, newly connected devices use an address in the range. As a result, if 50 devices are allocated, the range is from 192.168.1.100 through 192.168.1.149, in which case the devices use addresses like 192.168.1.101, 192.168.1.102, and so on.

Instead of using 192.168.1.100 as a starting address, that address might instead be the IP address assigned to the router that all the connected devices use as their default gateway address. If this is the case, and you need to make changes to the router settings, log in with the correct credentials at http://192.168.1.100.

192.168.1.100 on Private Networks

Any private network, whether a home or business network, can use 192.168.1.100, no matter which type of router is involved. It can be part of a DHCP pool or set as a static IP address. The device assigned to 192.168.1.100 changes when a network uses DHCP but does not change when you set up networks with static addressing.

Run a ping test from any other computer on the network to determine whether 192.168.1.100 is assigned to one of the networked devices. The router console also displays the list of DHCP addresses it assigned (some of which may belong to devices that are currently offline).

Because 192.168.1.100 is a private address, ping tests or other direct connection attempts from the internet or other outside networks will fail.

Considerations

Avoid manually assigning this address to any device when it belongs to a router's DHCP address range. Otherwise, IP address conflicts result, because the router can assign this address to a different device than the one currently using it.

However, if the router is configured to reserve the 192.168.1.100 IP address for a specific device (as indicated by its MAC address), then DHCP won't assign it to any other connection.

Resolve most DNS-related problems on a computer using an IP address (including 192.168.1.100) with the ipconfig /flushdns command.