Understanding the 192.168.1.100 IP Address

Private Networks can use 192.168.1.100

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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 also be assigned to any device on a local network that's set up to use this address range.

The 192.168.1.100 address can be configured on a network so that a specific device is assigned that address. It can also be used as the default gateway IP address.

Note: A network client does not gain improved performance or better security from having 192.168.1.100 as their address compared to any other private address.

192.168.1.100 on Linksys Routers

Many Linksys routers set 192.168.1.1 as their default local address and then define a range/pool of IP addresses that are made available to client devices via DHCP. While 192.168.1.100 is often the default for this setting, administrators are free to change it to a different address like 192.168.1.2.

Some Linksys router's support a configuration setting called "Starting IP Address" that defines which IP address is the first one in the pool that DHCP will allocate from. The first computer, phone, or other WiFi-connected device using the router will typically be assigned this address.

If 192.168.1.100 is chosen as the starting IP address in the pool, newly connected devices will use an address in the range.

So, if 50 devices are allocated, the range is from 192.168.1.100 through 192.168.1.149, in which case the devices will use addresses like 192.168.1.101, 192.168.1.102, etc.

Instead of using 192.168.1.100 as a starting address, it might instead be the IP address assigned to the router itself 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's settings, you have to 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 the type of router involved. It can be part of a DHCP pool or set as a static IP address, The device assigned to have 192.168.1.100 can change when a network uses DHCP but does not change when setting up 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. A router's console should also display the list of DHCP addresses it has assigned (some of which may belong to devices currently offline).

Because 192.168.1.100 is a private address, ping tests or any other direct connection attempt from the Internet or other outside networks, cannot be made. Traffic for these devices passes through the router and must be initiated by the local device.

Issues with 192.168.1.100

Administrators should avoid manually assigning this address to any device when it belongs to a router's DHCP address range. Otherwise, IP address conflicts can result since the router can assign this address to a different device than the one already 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 you can be sure that DHCP won't assign it to any other connection.

Most DNS-related issues on a computer using any IP address (including 192.168.1.100) can be resolved with the ipconfig /flushdns command.