Finf the Subnet Mask ??

Hi,

Take a look at the following site. It describes subnet masks quite well and there is a link off the bottom of the page that takes you to a summary section from which you'll see how to work it out...

http://www.exabyte.net/lambert/subnet/subnet_masking_definition.htm

(remove spaces from the above URL)

Cheers,
Tim.

Both are class A IP addresses, meaning the default mask is 255.0.0.0
But it is quite likely that this has been broken down into smaller subnets.

There isn't an easy way to determine the correct subnet mask. As mentioned above both are Class-A addresses, but they probably will be broken down to smaller subnets. Most companies break them down in Class-B or C addresses so they can create multiple networks for remote locations for example. When you know the router address you can make an educated guess which subnet is the correct one. Most administrators use the lowest _or_ the highest available ip-address in a subnet for their routers.

I know this looks stupid/probably you don't want that answer, but when using a Windows computer with one of the addresses mentioned you can use ipconfig (on WinNT/W2k) or winipcfg (on W9x).
On a *nix system you can use ifconfig to retrieve the correct ip address and subnet.