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Subnetting, explained with working examples
Written for CCNA students and for engineers who want the reasoning behind the numbers. Every example opens in the calculator with the values filled in.
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Subnetting, step by step
Binary, masks and prefixes, network and broadcast addresses, the block-size shortcut, equal subnets and VLSM, with practice questions.
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CIDR cheat sheet
Every prefix from /0 to /32 with netmask, wildcard and host counts, plus /24 subnet starts, mask octet values and private ranges. Prints on one A4 page.
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IPv6 subnetting
RFC 5952 notation, why LANs are /64, planning a /48 on nibble boundaries, ULA, /127 links and EUI-64 interface IDs.