Whois API for Looking up Accurate Domain Data.
Effortlessly retrieve accurate WHOIS details for any domain with our REST API. Perform bulk WHOIS queries and check URL availability in real time, all in a structured JSON format for seamless integration into your applications.
Engineered for High-Performance Teams
Our infrastructure handles millions of queries so you can focus on building your product without worrying about rate limits or parsing logic.
High Availability
Redundant server clusters across 4 global regions ensure your services never experience downtime.
Global Coverage
Support for legacy TLDs, gTLDs, and ccTLDs with normalized data fields across all extensions.
JSON-First Output
Stop parsing messy text records. Get clean, structured JSON every single time for easy integration.
Powering the next generation of domain tools
security Cybersecurity
Detect malicious domains and track cybercriminal infrastructure in real-time.
verified Brand Protection
Monitor trademark infringements and unauthorized usage of your brand assets.
insights Market Intelligence
Analyze domain ownership trends and industry shifts for competitive advantage.
payments Domain Investing
Track expiration dates and availability for high-value domain names.
Global Reliability & Speed
Low latency access from anywhere in the world with our globally distributed edge nodes.
Integrate in Minutes
Our API is designed to be as simple as possible. Get started with just a few lines of code.
curl -X GET "https://whoisjsonapi.com/v1/example.com" \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Accept: application/json"
import requests
response = requests.get(
"https://whoisjsonapi.com/v1/example.com",
headers={
"Authorization": "Bearer YOUR_API_KEY",
"Accept": "application/json",
},
)
print(response.json())
const response = await fetch("https://whoisjsonapi.com/v1/example.com", {
headers: {
Authorization: "Bearer YOUR_API_KEY",
Accept: "application/json",
},
});
const data = await response.json();
console.log(data);
package main
import (
"fmt"
"io"
"net/http"
)
func main() {
req, err := http.NewRequest("GET", "https://whoisjsonapi.com/v1/example.com", nil)
if err != nil {
panic(err)
}
req.Header.Set("Authorization", "Bearer YOUR_API_KEY")
req.Header.Set("Accept", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
panic(err)
}
fmt.Println(string(body))
}
Simple, Transparent Pricing
Choose the plan that's right for your scale. No hidden fees.
Basic
Best for solo entrepreneurs and small startups
- check_circle 2,000,000 requests / mo
- check_circle No credit card required
- check_circle 7-day free trial
- check_circle Cancel anytime
- check_circle Check over 500 million domain names
- check_circle Domain availability API
- check_circle Regular support
- cancel Bulk WHOIS API
Premium
Good for small companies who works with a large number of domains
- check_circle 5,000,000 requests / mo
- check_circle No credit card required
- check_circle 7-day free trial
- check_circle Cancel anytime
- check_circle Check over 500 million domain names
- check_circle Bulk WHOIS API
- check_circle Domain availability API
- check_circle Priority support
Enterprise
Best for enterprise level companies and projects
- check_circle 15,000,000 requests / mo
- check_circle No credit card required
- check_circle 7-day free trial
- check_circle Cancel anytime
- check_circle Check over 500 million domain names
- check_circle Bulk WHOIS API
- check_circle Domain availability API
- check_circle Priority support
Frequently Asked Questions
Everything you need to know about our domain data services.
How accurate is your WHOIS data?
We query source registries and maintain a sophisticated tiered caching system to ensure sub-millisecond response times. Our advanced parsing engine normalizes disparate data formats from over 2000 TLDs into a single, reliable JSON structure. To provide the best balance of speed and accuracy (99.9%), we serve fresh data from our cache immediately, while automatically scheduling background refreshes for any stale records to ensure you always have access to the latest information.
Do you support private WHOIS records?
Yes, we return exactly what is available in the public record. If a domain has privacy protection, the API will reflect the proxy details provided by the registrar.
What is your average response time and uptime?
The average response time is under 200ms for cached queries. Fresh WHOIS lookups typically complete in 300–800ms depending on the upstream registry. We maintain 99.9% uptime across multi-region infrastructure with automatic failover.
Is WhoisJsonAPI RDAP and GDPR-compliant?
Yes. We fully support the RDAP protocol (Registration Data Access Protocol), which is the modern replacement for legacy WHOIS. Our system automatically queries RDAP endpoints when available and falls back to traditional WHOIS servers for older TLDs. All data handling complies with GDPR requirements — we only return information that is publicly available through official registry channels.
Still have questions?
Contact Support TeamReady to scale your domain tools?
Join 3000+ developers building with WhoisJsonAPI today. Start for free, no credit card required.