Tools
Each tool does one job. The subnet calculator is the general IPv4 view. The others start from CIDR text, a mask, a range, a wildcard, an IPv6 prefix, or a membership question.
IPv4
Address, prefix, mask, range, and the checks that follow from them.
- CIDR CalculatorStart from CIDR notation and see the exact block it names.
- Subnet Mask CalculatorConvert a prefix length and a dotted decimal mask.
- IP Range CalculatorInclusive block bounds, then the usable host range.
- Wildcard Mask CalculatorInvert a subnet mask into the wildcard bits an ACL checks.
- IP in CIDR CheckerTest whether one address belongs to a network.
- Subnet SplitterDivide a network into equal, non-overlapping subnets.
- Subnet MergerFind the smallest subnet that contains multiple networks.
- IP Address ConverterConvert between decimal, binary, hexadecimal, and CIDR.
IPv6
A 128-bit prefix, with no broadcast address and no usable-host subtraction.
