Developer Utility
IPv4 Subnet Calculator Tool
Calculate network, broadcast, host range, and mask details from IPv4 CIDR input.
Language: TextUtility: ParseUtility: Inspect
Input: 192.168.10.37/24 Network: 192.168.10.0 Broadcast: 192.168.10.255 Subnet mask: 255.255.255.0 Wildcard mask: 0.0.0.255 First host: 192.168.10.1 Last host: 192.168.10.254 Total addresses: 256 Usable hosts: 254
What This Tool Does
Calculate IPv4 subnet boundaries and host ranges quickly from CIDR notation.
Use it to inspect or transform input quickly, then carry validated output into code, tests, or API requests.
Common Use Cases
- Validate infrastructure subnet plans before provisioning.
- Confirm network and broadcast addresses during troubleshooting.
- Check usable host counts for environment sizing.
Common Pitfalls
- Special prefixes like /31 and /32 have edge-case host semantics.
- Input typos in octets or prefix values can invalidate results.
FAQ
Does this show first and last usable host?
Yes, with edge-case handling for /31 and /32.
Can I input plain CIDR like 10.0.0.0/24?
Yes, CIDR input is required for subnet calculations.
Does this tool send data to a backend?
Most tools process input client-side in your browser unless explicitly noted.