Usable addresses follow point-to-point and single-host semantics instead of always subtracting network and broadcast addresses.
IP NETWORK CALCULATOR
IP / CIDR Calculator
Calculate IPv4 and IPv6 network boundaries and address classes
All input is processed in this browser and is never sent to a server or written to local storage.
Enter an IPv4 or IPv6 CIDR to calculate.
CALCULATION RESULT
Network results
- Normalized form
- IP version
- Prefix length
- Address class
- Network start
- Network end / broadcast
- First usable host
- Last usable host
- Total addresses
- Usable hosts
- Decimal integer
- Hexadecimal
- IPv4-mapped IPv6
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Calculation notes
BigInt preserves the exact address count without floating-point loss.
Distinguishes public, private, loopback, link-local, multicast, documentation, and other reserved ranges.