Perhaps the most recognizable aspect of subnetting is the subnet mask. Like IP addresses, a subnet mask contains four bytes (32 bits) and is often written using the same dotted-decimal notation.

I’ll never understand why this isn’t explained to students, because it makes mask calculations a lot easier. Remember that all subnets start with EVEN numbers and all subnet endings are ODD.

These bits become a tradeoff based on the network class (A, B or C). Subnet masks for a Class C network (small network) use the first 24 bits for subnet ID and the last 8 for host ID. These last 8 ...

Subnetting and creating subnet masks is often outsourced to consultants, but doing it yourself can be both challenging and rewarding. In the IT world, specifically in networking, there aren’t ...