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Network tools / Subnet Calculator

Subnet Calculator

Split an IPv4 network into smaller subnets using a CIDR prefix or dotted subnet mask.

Example: 192.168.1.0/24 or 192.168.1.0/255.255.255.0. The new prefix must be at least as large as the original prefix.

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Subnet Calculator

Subnet Calculator

The parent network is normalized. Subnets include address counts and host ranges; /31 and /32 follow point-to-point and single-address conventions.