Need to query domain ownership, registration dates, and registrar details programmatically? A WHOIS API handles the raw WHOIS protocol and delivers clean JSON. This guide compares the top WHOIS APIs in 2026 across pricing, rate limits, data quality, and what you actually get back.
Why Use a WHOIS API?
Raw WHOIS queries work for one-off lookups but fail at scale. A REST WHOIS API solves the common pain points:
- Domain monitoring — detect expiring or newly registered domains automatically
- Lead qualification — look up a prospect domain age, owner, and registrar
- Fraud detection — flag domains registered less than 30 days ago
- Competitive research — enumerate a competitor registrar footprint
- Threat intelligence — identify disposable or privacy-shielded registrations
Top WHOIS APIs at a Glance (2026)
| API | Free Tier | Paid From | Parsed JSON | Expiry Date | Bulk |
|---|---|---|---|---|---|
| kiprio.com Best Value | 100 req/day | $9/mo | Yes | Yes | Yes |
| WhoisXML API | 500 credits | $99/mo | Yes | Yes | Yes |
| APILayer WHOIS | 1,000 req/mo | $14.99/mo | Yes | Yes | No |
| Abstract API | 20 req/mo | $14/mo | Yes | Yes | No |
| WhoisFreaks | 100 req/mo | $9.99/mo | Yes | Yes | Yes |
1. kiprio.com WHOIS API — Best Value
Free tier: 100 requests/day, no credit card required
Pro: $9/month — 10,000 requests/month
Endpoint: GET https://kiprio.com/v1/whois?domain=example.com
The kiprio WHOIS API returns clean, parsed JSON with registrar, creation date, expiry date, nameservers, registrant country, and privacy shield status across TLDs.
curl "https://kiprio.com/v1/whois?domain=github.com" -H "X-API-Key: YOUR_KEY"
{
"domain": "github.com",
"registrar": "MarkMonitor Inc.",
"created_at": "2007-01-26",
"expires_at": "2025-01-26",
"nameservers": ["ns1.p16.dynect.net", "ns2.p16.dynect.net"],
"registrant_country": "US",
"privacy_shield": false
}
Python example:
import httpx
def whois_lookup(domain, api_key):
r = httpx.get("https://kiprio.com/v1/whois",
params={"domain": domain},
headers={"X-API-Key": api_key})
r.raise_for_status()
return r.json()
info = whois_lookup("example.com", "YOUR_KEY")
print(f"Expires: {info['expires_at']}")
Best for: Developers who want clean, affordable WHOIS with a daily free tier.
2. WhoisXML API — Enterprise Choice
Free tier: 500 credits (one-time) | Paid: $99/month (75,000 queries)
Most data-rich option: 2,600+ TLDs, 10+ years of historical WHOIS snapshots, reverse WHOIS, and domain availability. If you need historical data or SOC-level threat intel, nothing else competes.
3. APILayer WHOIS API
Free tier: 1,000 req/month | Paid: $14.99/month
Good documentation and parsed JSON. The 1,000/month free tier exhausts in two days of moderate monitoring. No bulk endpoint or historical data.
4. Abstract API WHOIS
Free tier: 20 req/month | Paid: $14/month
Useful only if already paying for other Abstract APIs. The 20/month cap is not viable for any systematic use.
5. WhoisFreaks
Free tier: 100 req/month | Paid: $9.99/month
Competitive pricing with bulk endpoints and newly registered domain feeds. Good alternative to kiprio if you need more than 100 daily lookups.
What to Look For in a WHOIS API
Parsed JSON vs raw text: Structured fields (created_at, expires_at, registrar) are essential — raw WHOIS text parsing breaks across registrars.
Daily vs monthly caps: 100/day ~ 3,000/month. A monthly cap of 1,000 sounds similar but exhausts in two days of monitoring.
TLD coverage: ccTLDs like .uk, .de, .io vary by registry policy — verify before committing.
Response freshness: Real-time queries outperform 24h-cached results for domain monitoring.
Summary
- Free daily monitoring — kiprio.com (100/day, no card)
- Under $10/month — kiprio.com Pro ($9/mo) or WhoisFreaks ($9.99/mo)
- Enterprise / historical — WhoisXML API
- Bundled platform — APILayer WHOIS
Try kiprio.com free: 100 WHOIS lookups/day, clean parsed JSON, no credit card. Get free API key | Full comparison with live demo
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