50 Billion +
Domains and subdomains
116 Billion +
Historical DNS
records
60% +
Cyber 150 in key categories trust us
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Get Access to Extensive Historical DNS Data—Minus the Noise
Effective cybersecurity requires access to historical DNS data you can trust to effectively collect and analyze billions of daily internet events, including signals of potential ongoing threats.
However, many passive DNS sources are incomplete or cluttered with unreliable data, leading to false positives and operational inefficiencies. WhoisXML API addresses these challenges with best-in-class intelligence that offers:
- Unmatched historical DNS coverage backed by years of data.
- Flexible data access via API or downloadable database files.
- Multiple record types: A, AAAA, MX, NS, TXT, CNAME, and more.
- Wildcard and active flags to filter DNS record noise.
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Asset Discovery & Inventory Management
Identify connected or hidden domains and subdomains to keep asset inventories up to date.
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Brand & Fraud Protection
Monitor DNS changes to prevent domain hijacking, protect brand reputation, and uncover fraudulent behaviors.
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Threat Detection & Monitoring
Detect unusual DNS patterns, track threat actor activities, and identify compromised infrastructures hosting malware.
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Third-Party Risk Assessment
Assess vendor risks by tracing domain configuration changes and identifying suspicious third-party activities.
How We Deliver the Data to You
DNS Chronicle API
Make API calls on demand, pulling only the data you need, without having to download and manage datasets.
Premium DNS Database
Access downloadable historical DNS records in bulk, designed for seamless integration and scalability.
Take a Peek at a Data Sample
Here’s what a sample of our passive DNS intelligence looks like:
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A (IPv4) records
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TXT records
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AAAA (IPv6) records
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CNAME records
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MX records
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SOA records
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NS records
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PTR records
Trusted Provider of Passive DNS Data for Cybersecurity
"We did trials with WhoisXML API to make sure the data was truly resulting in successful takedowns. We were able to consistently discover and mitigate real threats as a result of using the products."
"WhoisXML API is a responsive and reliable provider of domain intelligence. Whenever there are issues, they are quick to respond and resolve them. Working with them is smooth and straightforward."
"WhoisXML API’s rich repository of domain records will be invaluable for Cyware and joint customers, as it enables automated enrichment of domain and IP content via Cyware Orchestrate."
