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△ CIDR Cheat Sheet

Complete /0 – /32 reference. Exam-critical rows highlighted in orange. Filter by prefix or host count.

Jump to: /8 /16 /24 /25 – /30 /31 /32

Prefix	Subnet Mask	Wildcard Mask	Total Hosts	Usable Hosts	Class

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Legend:

Exam-critical row (/8, /16, /24–/30)