IPv4 Subnet Calculator

Convert an IPv4 address and CIDR prefix into network, broadcast, mask, wildcard and usable-host ranges.

A practical IPv4 addressing aid for GCS, payload, sensor and edge-network planning.

Start here

  1. Enter an IPv4 address and the CIDR prefix length, such as /24.
  2. Choose Calculate to derive the subnet from that address and prefix.
  3. Read the network, broadcast, mask and usable-host range.
How to read the results

Use the resulting range when allocating GCS, payload and sensor addresses. Read the special /31 and /32 treatment in the results when applicable.

Local calculation: values are processed in your browser. Calculation inputs are not transmitted. Optional profiles are stored only in this browser.
Optional aircraft profile: Manual values
Active profile: Manual values
/bits

Planning output only. Verify assumptions and results against authoritative data, manufacturer information, approved procedures, test evidence and competent engineering or regulatory review before use.

Calculation basis

The IPv4 address is converted to a 32-bit integer. The CIDR prefix creates the subnet mask; bitwise AND gives the network address and the inverse mask gives the broadcast address. /31 and /32 networks are reported using point-to-point and host-route conventions.

Limitations and verification

  • Does not discover devices, test reachability, configure routes, check VLANs or validate an operational network design.
  • Usable-host conventions can vary for specialist implementations.
  • Avoid publishing operational addressing schemes or sensitive network details.

Version and review status

Formula set: v1.2
Staging review date: 17 August 2026
Status: Staging beta pending user acceptance and cross-browser checks.