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GET /v1/subnet

CIDR subnet calculator

Try it live

10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/subnet-api

It works. Grab an API key and use it in your project.

Get an API key

Code snippets

curl "https://api.oanor.com/subnet-api/v1/subnet" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/subnet-api/v1/subnet", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/subnet-api/v1/subnet");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/subnet-api/v1/subnet",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "cidr": "192.168.1.0/24",
        "prefix": 24,
        "netmask": "255.255.255.0",
        "network": "192.168.1.0",
        "version": 4,
        "wildcard": "0.0.0.255",
        "broadcast": "192.168.1.255",
        "last_host": "192.168.1.254",
        "first_host": "192.168.1.1",
        "usable_hosts": 254,
        "total_addresses": 256
    },
    "meta": {
        "timestamp": "2026-05-30T10:10:56.638Z",
        "request_id": "94f08fee-7e90-4133-a164-e5eeb7900758"
    },
    "status": "ok",
    "message": "OK",
    "success": true
}