Domain registration lookup
API · /whois-api
WHOIS API
healthy
3,611 Subscribers
Domain and IP registration lookups via RDAP — the modern, structured successor to WHOIS. Get the registrar, registration / update / expiry dates, status codes, nameservers, DNSSEC state, and IP network ownership (CIDR, organization, country).
api.oanor.com/whois-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 942 ms
- Server probes · 24h
- Subscribers
- 3,611
- active
- Total calls
- 130
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 750 calls / month
- 1 requests / second
- Hard cap (429 above quota, no overage)
- 750 lookups/month at 1 rps
- No credit card
- Domain WHOIS + RDAP JSON
- Registrar, dates, status, nameservers
Basic
€10.00 /month
- 35,000 calls / month
- 5 requests / second
- Hard cap (429 above quota, no overage)
- 35,000 lookups/month at 5 rps
- Domain + IP/ASN RDAP lookups
- DNSSEC state + status codes
- Commercial use allowed
Pro
€39.00 /month
- 200,000 calls / month
- 15 requests / second
- Hard cap (429 above quota, no overage)
- 200,000 lookups/month at 15 rps
- Full RDAP entity + network ownership
- Bulk-friendly throughput
- Email support
Mega
€119.00 /month
- 850,000 calls / month
- 40 requests / second
- Hard cap (429 above quota, no overage)
- 850,000 lookups/month at 40 rps
- Priority gateway routing
- 99.9% uptime SLA
- Priority support
Built by
Related APIs
Other APIs with overlapping tags.
Domain Parser API
Parse any hostname or URL with the Public Suffix List. Split a domain into its subdomain, registrable domain (eTLD+1) and public suffix (eTLD), or fetch just the suffix or just the registrable domain. Handles full URLs, internationalized (punycode) domains, IP addresses, multi-level suffixes like co.uk and com.au, and — when you ask for it — private suffixes such as github.io and s3 buckets. Built on an always-current Public Suffix List and served entirely in-memory, so responses are instant and the service is always available. Ideal for cookie and domain scoping, analytics attribution, email and link validation, security and anti-abuse, and devops tooling.
api.oanor.com/domain-api
DNS Lookup API
Resolve DNS records — A, AAAA, MX, NS, TXT, CNAME, SOA, SRV, CAA, PTR — for any domain, fetch all common records in a single call, or run a reverse PTR lookup for an IPv4 address. Backed by Google DNS-over-HTTPS. Ideal for devops tooling, uptime and email-deliverability checks (SPF/DKIM/DMARC), security research and domain monitoring.
api.oanor.com/dns-api
Subnet API
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.
api.oanor.com/subnet-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
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for WHOIS API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call WHOIS API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for WHOIS 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 WHOIS API cost?
WHOIS API has a free tier with 100 calls / month. Paid plans start at €10.00 / 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 WHOIS API GDPR-compliant?
All requests to WHOIS 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/whois-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/whois-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/whois-api/SOME_PATH");
curl_setopt($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/whois-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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