Guides
Step-by-step IT guides, written from hands-on practice. Concept guides explain an idea and work it by hand; Lab guides walk through real configuration.
Networking
Addressing, subnetting, switching and routing — the foundations everything else sits on.
How to subnet an IPv4 network
Find the network, broadcast and usable hosts of any address by hand, then split a network into smaller subnets. Every example links to the calculator so you can check it.
- Read the prefix and the mask
- Find the block size
- Find the network address
- Find the broadcast and the usable hosts
- Split a network into subnets