You have a Class B address of 172.16.0.0 . You have been told to use a subnet mask of 255.255.192.0 . Looking at the subnet mask you determine that the third octet is the octet of interest.

Devices also have a subnet mask, which defines which part of the IP address belongs to the network and which part belongs to the device. The gateway, also called a default gateway, is the device ...

I was trying to figure out how to do this myself, but then I thought "hey, I bet some Arsian has done this." I have a spreadsheet with a bunch of IP addresses in a single column. I'd like to make ...