CIDR API

»» Tools » API

The CIDR calculator available over HTTP, with an API key and rate limits — free, for your scripts and internal tools.

»» Request

GET /api/v1/cidr — parameters address and prefix, authentication via the Authorization: Bearer <key> header.

curl -H "Authorization: Bearer nak_votre_cle" \
  "https://www.netarchitect.fr/api/v1/cidr?address=192.168.1.0&prefix=24"

»» Response (200)

{
  "ok": true,
  "result": {
    "version": 4,
    "prefix": 24,
    "network": "192.168.1.0",
    "broadcast": "192.168.1.255",
    "netmask": "255.255.255.0",
    "wildcardMask": "0.0.0.255",
    "firstHost": "192.168.1.1",
    "lastHost": "192.168.1.254",
    "usableHostCount": "254",
    "totalAddresses": "256"
  }
}

»» Errors

Code	Cause
400	Missing or invalid parameters (address, prefix)
401	Missing or invalid API key
429	Rate limit exceeded (burst or daily quota)
503	Service temporarily unavailable

{ "error": "Invalid API key." }

»» Limits

20 / 1 m

Burst per key

500 / 1 d

Daily quota per key

3 / 1 d

Keys per IP (signup)

Exceeding the daily quota returns the X-RateLimit-Limit, X-RateLimit-Remaining and X-RateLimit-Reset headers.

»» Get a key

Free, no credit card required. The key is shown only once — save it.