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Utility #10Bitwise 32-Bit
CIDR to IPv4 Range Converter
Convert any CIDR prefix to usable start and end IP addresses, or decompose arbitrary IP ranges into minimal CIDR blocks with 100% local mathematical precision.
Quick presets:
CIDR Prefix Reference Table
Common CIDR mask lengths, dotted decimal equivalents, and usable host counts.
| CIDR Prefix | Subnet Mask | Wildcard Mask | Total Addresses | Usable Hosts |
|---|---|---|---|---|
| /32 | 255.255.255.255 | 0.0.0.0 | 1 | 1 |
| /30 | 255.255.255.252 | 0.0.0.3 | 4 | 2 |
| /28 | 255.255.255.240 | 0.0.0.15 | 16 | 14 |
| /27 | 255.255.255.224 | 0.0.0.31 | 32 | 30 |
| /26 | 255.255.255.192 | 0.0.0.63 | 64 | 62 |
| /24 | 255.255.255.0 | 0.0.0.255 | 256 | 254 |
| /22 | 255.255.252.0 | 0.0.3.255 | 1,024 | 1,022 |
| /16 | 255.255.0.0 | 0.0.255.255 | 65,536 | 65,534 |
Frequently Asked Questions About CIDR
Technical answers regarding routing prefixes, bitmask math, and subnetting.
Classless Inter-Domain Routing (CIDR) represents an IP network by appending a forward slash and the bit-length of the network prefix (e.g. 192.168.1.0/24). It replaced rigid legacy Class A, B, and C address allocations to conserve IPv4 space.
Related Technical Articles
Deep-dive networking articles and protocol specifications related to this utility.
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What Is a Subnet? Formula, CIDR Chart & Calculation Examples [2026]
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