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API · /subnet-api

Subnet API

healthy 3,139 Subscribers

A fast, fully-local IP and subnet calculator: validate IPv4 and IPv6 addresses with type classification (private, public, loopback, link-local, multicast, CGNAT or reserved), compute CIDR subnet details (network, netmask, wildcard, broadcast, first and last host, total addresses and usable hosts, with IPv6 network and range size), check whether an address falls inside a CIDR block, and convert addresses (IPv4 to integer, hex and binary; IPv6 expand and compress). Every endpoint accepts input via the query string or the request body. Pure server-side compute, no third-party upstream, so responses are instant and always available. Ideal for devops, network automation, IPAM, firewall and ACL tooling and cloud infrastructure.

#subnet #ip #cidr #network #ipv6 #devops #dev-tools
api.oanor.com/subnet-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/subnet-api/openapi.json
/api/subnet-api/llms.txt

Discovery: GET /api/index.json lists every API.

Subnet API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
74 ms
Server probes · 24h
Subscribers
3,139
active
Total calls
76
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 14,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 14,000 calls/month, 3 req/s
  • All endpoints: validate, subnet, contains, convert
  • IPv4 + IPv6 with type classification
  • No credit card
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Basic

€4.00 /month

  • 240,000 calls / month
  • 12 requests / second
  • Hard cap (429 above quota, no overage)
  • 240,000 calls/month, 12 req/s
  • Full IPv4/IPv6 validate, subnet, contains, convert
  • Commercial use allowed
  • Email support
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Pro

€15.00 /month

  • 1,300,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,300,000 calls/month, 40 req/s
  • All endpoints, batch-friendly throughput
  • Priority email support
  • Commercial use allowed
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Mega

€40.00 /month

  • 6,800,000 calls / month
  • 120 requests / second
  • Hard cap (429 above quota, no overage)
  • 6,800,000 calls/month, 120 req/s
  • High-volume IPAM / firewall / network-automation use
  • All endpoints, full IPv6 range sizing
  • Priority support
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Subnet API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Subnet API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Subnet API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Subnet API cost?
Subnet API has a free tier with 100 calls / month. Paid plans start at €4.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Subnet API GDPR-compliant?
All requests to Subnet API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/subnet-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/subnet-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/subnet-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/subnet-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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