A single ASN → organisation + country
API · /asn-api
ASN Lookup API
healthy
3,817 Subscribers
Look up Autonomous System Numbers (ASNs) — the identifiers that label every network on the public internet — mapped to their owning organisation and country. 122,000+ ASNs derived from the Regional Internet Registries (ARIN, RIPE, APNIC, LACNIC, AFRINIC). Resolve an ASN to its operator (e.g. AS15169 → Google LLC, US; AS13335 → Cloudflare; AS16509 → Amazon), or search by organisation name and country (e.g. "hetzner" in DE). Ideal for network intelligence, abuse/security investigation, traffic analysis, IP-reputation tooling and BGP/peering research.
api.oanor.com/asn-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 82 ms
- Server probes · 24h
- Subscribers
- 3,817
- active
- Total calls
- 57
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 10,000 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 10,000 calls/month
- 2 req/sec
- Lookup + search
- No credit card
Starter
€3.50 /month
- 110,000 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 110k calls/month
- 8 req/sec
- Org / country search
- Email support
Pro
€10.00 /month
- 550,000 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 550k calls/month
- 20 req/sec
- Security / abuse tooling
- Priority support
Mega
€27.00 /month
- 2,600,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 2.6M calls/month
- 50 req/sec
- Network-intel platform
- Dedicated SLA
Built by
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Internet routing and number-resource intelligence as an API, powered by RIPEstat — the open data service of the RIPE NCC, one of the world's five Regional Internet Registries. Answer the questions network engineers, security teams and researchers ask about the public internet: which Autonomous System and prefix does an IP address belong to; what is an AS (its operator/holder name, whether it is currently announced in BGP, its type and registration block); which IPv4 and IPv6 prefixes does an AS announce; who are an AS's BGP neighbours and peers (and how many); who is the abuse-reporting contact for an IP, prefix or ASN, and which RIR is authoritative; and is a prefix correctly originated according to RPKI route-origin validation (valid, invalid or unknown) with the matching ROAs. The data is real-time, drawn from the RIPE NCC's global network of BGP route collectors and the registries. Inputs accept IPv4 and IPv6 addresses, CIDR prefixes and AS numbers (with or without the AS prefix). Ideal for network operations, threat intelligence and abuse handling, BGP and RPKI monitoring, IP reputation and OSINT tooling, and internet research. Data from the RIPE NCC RIPEstat service.
api.oanor.com/ripestat-api
IP Geolocation API
Geolocate any IPv4 or IPv6 address — country, region, city, postal code, latitude/longitude, timezone, calling code, currency and network details (ASN, ISP, organization). Look up any address or detect the caller's own public IP.
api.oanor.com/ipgeo-api
Fiber Optic Link Budget API
Fiber-optic link-budget engineering maths as an API, computed locally and deterministically — the power-budget, loss and reach numbers a network or fibre engineer designs an optical link with. The power-budget endpoint gives the optical power budget = transmit power − receiver sensitivity (in dBm), the total loss the link can tolerate: a 0 dBm transmitter into a −23 dBm receiver gives a 23 dB budget, with the powers also shown in milliwatts. The loss endpoint adds up the real link loss from the fibre attenuation × length plus the connector and splice losses — single-mode fibre runs about 0.35 dB/km at 1310 nm and 0.20 dB/km at 1550 nm, each mated connector ~0.5 dB and each fusion splice ~0.1 dB — so 10 km of fibre with two connectors is 4.5 dB. The reach endpoint gives the maximum distance = (power budget − fixed losses − system margin) ÷ the fibre attenuation, reserving a margin (typically 3 dB) for ageing, bends and future repair splices so the link still works years on. Everything is computed locally and deterministically, so it is instant and private. Ideal for FTTx and data-centre link planning, network-engineering and OSP tools, fibre-survey and design utilities, and telecom calculators. Pure local computation — no key, no third-party service, instant. Loss-limited model — at high bit rates dispersion can cap distance first. 3 compute endpoints. For fibre numerical aperture and photonics use a fiber API; for RF line-of-sight a Fresnel-zone API.
api.oanor.com/opticalbudget-api
MAC Address API
MAC-address (EUI-48) tooling as an API, computed locally and deterministically. The parse endpoint validates a MAC address given in any common notation — colon, hyphen, Cisco dotted or a bare run of 12 hex digits — and returns it in every standard format, split into its OUI (the first three bytes, assigned to a hardware vendor) and its NIC (the last three, device-specific) parts, plus the 48-bit integer value. The analyze endpoint reads the control bits of the first octet: the least-significant bit is the I/G bit that marks a unicast or multicast address, and the next bit is the U/L bit that marks a universally (vendor-assigned) or locally administered address, and it flags the broadcast address ff:ff:ff:ff:ff:ff. The eui64 endpoint derives the modified EUI-64 interface identifier — flipping the U/L bit and inserting FF:FE in the middle — and the resulting IPv6 link-local address (fe80::/64) used by stateless address autoconfiguration. Vendor name lookup needs the IEEE OUI registry and is not included. Everything is computed locally and deterministically, so it is instant and private. Ideal for networking, IoT, device-management, monitoring and security app developers, MAC-normalisation and IPv6 tools, and networking education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is MAC-address tooling; for IPv4 subnetting use a subnet API and for DNS records a DNS API.
api.oanor.com/macaddress-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for ASN Lookup API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call ASN Lookup API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for ASN Lookup 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 ASN Lookup API cost?
ASN Lookup API has a free tier with 100 calls / month. Paid plans start at €3.50 / 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 ASN Lookup API GDPR-compliant?
All requests to ASN Lookup 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/asn-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/asn-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/asn-api/SOME_PATH");
curl_setopt($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/asn-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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