CIDR Calculator

IPv4 network math for ops. Client-side only; no tracking; no requests.

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CIDR (e.g. 10.0.0.0/24 or 10.0.0.12/20)

Tip: you can paste just IP and we’ll assume /32.

Network

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Broadcast

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Netmask

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Wildcard

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Host range

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Counts

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Notes:

/31 is treated as RFC 3021 point-to-point (2 usable IPs; no broadcast semantics).
/32 is a single host.
All computations are local in your browser.