I need a subnet mask do you have any idea how I can?

Bill
what about the sub net mask is it exactly the same as the others ?

Has the subnet mask been used to create a separate network ?
what is the subnet mask ?
is it 255.255.255.0
does it have numbers in it that are not 255 or 0 ?
if the number is different to this you have subnetting on your network and may need to use a particlar ip address to fit into the subnet.

You need to check the network address of the newly connected network. you said it was connected to a network A (e.g. 192.168.1.0 subnet mask 255.255.255.0 or /24) and now you are connected to network B (e.g. 192.168.2.0 subnet mask 255.255.255.0 or /24). Your device had an ip address assigned in the old network, could be 192.168.1.99 this ip can not communicate with the new network 192.168.2.0, you need fir to find out what is the new network address and subnet you need to ask your network admin. and then modify the setting of your router to be part of the new network.

go to your computer open command pad type ipconfig/all hit enter and look for your subnet will be the same for your xbox.

It sounds as if you are trying to set up manual IP settings. The subnet mask you will want to use will be 255.255.255.0

You don't need a CD - there is a web interface. First, download the user manual here.

I suspect your problem is the Linksys/Belkin combination. Linksys by default uses a subnet of 192.168.1.xxx while Belkin uses 192.168.2.xxx. With a subnet mask of 255.255.255.0 (the default for both), no communication would be possible between these two subnets. The "255" in each of those first three octets means they must match exactly.

Either move the Linksys to 192.168.2.xxx or the Belkin to 192.168.1.xxx (and keep the same subnet mask) OR you can change the subnet mask to a broader one (255.255.254.0) that allows the two different subnets to talk to each other. This subnet mask would have to be applied to both devices.

According to the manual, the default address of the Belkin is 192.168.2.254, which leads to your next problem - your PC probably can't connect to the Belkin device. Assuming your PC is configured for the Linksys subnet, the easiest way to communicate with the Belkin is to use a network cable directly linking your PC to the Belkin (may need to be a crossover cable) and manually set your PC's IP address to one in the same subnet as the Belkin, like for example 192.168.2.200 with a subnet mask of 255.255.255.0. Then you can open your web browser and point it to the Belkin default address, as outlined in the manual, and make whatever changes are required.

When configuring an address for the printer, the IP configuration might look like (just an example):

IP Address - 192.168.1.2

Subnet Mask - 255.255.255.0

Default Gateway - 192.168.1.1

It's important to note that even though you are not using any IP addresses in the default range for DHCP, the Subnet Mask and Default Gateway addresses will be THE SAME.

If you have another device on your network that will be assign a fixed address, you would use for example:

IP Address - 192.168.1.3

Subnet Mask - 255.255.255.0

Default Gateway - 192.168.1.1

For any other devices, just increment the IP address by one, 192.168.1.4, 192.168.1.5, etc and use the same Subnet Mask and Default Gateway.
(see the owners manual or site for steps on configuraing the printer TCP/IP information). This should take care of any conflicts.

Subnet mask for 86 PCs is more than 64 and less than 128. it means that subnet mask is 255.255.255.128
You can have PC IP address in range 172.31.0.129 - 172.31.0.254

To change you subnet mask, go to control panel. look for network settings. select your internet. Right-click and properties. Look for subnet mask options (Try TCP/IP) If your subnet mask settings arent on automatic, put it to auto, if they are on auto, manually type in 255.255.255.0 (That is what is supposed to be)

Yes, the xp machine connects to the net. DHCP is not enabled. The ipconfig/all command brings up the correct static ip address, subnet mask, and default gateway. But it does also say under the ip configuration that ip routing is not enabled. I did have the 2000 machine connected when I first set up the router yesterday, but I booted up my laptop to try to set up a wireless connection, and then I had to reinstall the entire router set-up.