How do I use the Subnet Calculator (v2)?

Input format: 192.168.1.0/24 /31 and /32 are supported for point-to-point links The wildcard mask is useful for ACL entries in Cisco IOS

Is the Subnet Calculator (v2) free and private?

Yes — it runs in your browser, requires no signup for basic use, and your data never leaves your device. The famous 10.0.0.0/8 'private' range reserves 16.7 million addresses per network — more than the entire public IPv4 internet had in 1985.

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Subnet Calculator (v2)

CIDR → subnet mask, network, broadcast, first/last host, host count

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CIDR (e.g. 192.168.1.0/24)

Subnet Info

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