DNS Chronicle API allows you to access past A and AAAA records for an FQDN, or retrieve a list of FQDNs historically associated with an IP address. This ability enables you to perform searches based on the data you currently have.
Clear and comprehensive API documentation is available to facilitate your integration and usage of DNS Chronicle API. API results are provided in JSON or XML format, making it compatible with most systems.
The API retrieves data from a market-leading historical DNS record database with billions of recorded events, allowing you to uncover the deep DNS history of any web property and its connections.
Identify unusual changes in domains’ DNS records, such as rapid IP address shifts, which may indicate malicious activity.
Discover outdated or previously unknown domains and subdomains linked to historical company IP addresses.
Track the historical DNS activity of known malicious domain names to uncover links to threat actors and detect suspicious patterns.
Analyze the past IP address resolutions of domain names to support investigations into infrastructure and usage patterns.
Our comprehensive database of historical DNS records contains information on billions of domains and subdomains, enabling users to gather all available DNS data points.
Request a Quote“We want to provide all Cyberscape users the ability to integrate relevant data for their cyber threat investigations. WhoisXML API provides unique data that will be helpful to the cyber threat investigation community, allowing analysts to shorten the cycle of understanding and mitigating threats.”
“WhoisXML API’s passive DNS database, even the lite version for academic purposes, has much better subdomain data coverage compared with other commercial and free databases.”
“WhoisXML was the game changer for us. It has revolutionized our ability to disrupt cybercrime in process and at scale by quickly identifying all of the vendors providing material support for scammers using sophisticated website templates that look legitimate. By quickly identifying the vendors unknowingly supporting the criminals, we can provide them with public interest justification to burn down the criminal infrastructure.”
“After thorough testing, we were thrilled to find that Chronicle DNS Database consistently identified 10 times more 'active' subdomains compared to other options in the market.”
















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Reverse IP/DNS API
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