IPv4 Subnet Calculator
Calculate network, broadcast, usable range, mask, and wildcard from an IP + CIDR or subnet mask.
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Practical Network Engineering Tools
Free tools for subnetting, IP addressing, DNS, diagnostics, networking calculations, and everyday network engineering tasks.
Popular Tools
CIDR Calculator
Break down a CIDR block into its network details, plus a full CIDR reference table.
Open ToolVLSM Calculator
Allocate variable-length subnets from a base network to meet multiple host-count requirements.
Open ToolIP Range Calculator
Find the total address count and the CIDR blocks that cover a start-to-end IP range.
Open ToolWildcard Mask Calculator
Convert between subnet masks and wildcard masks for ACLs and OSPF configuration.
Open ToolIPv4 ↔ Binary Converter
Convert an IPv4 address to its 32-bit binary form and back again, octet by octet.
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IP & Subnetting
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