WHOIS API offers unified & consistent data

Our hosted WHOIS API service provides the registration details, also known as the WHOIS record data, of a domain name, an IP address, or an email address. All of the WHOIS information we offer is adequately parsed and normalized to a consistent format so it can easily fit in with your business operations.

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500 free API requests. No credit card required.

374 Million+Active domains tracked

25.5 Billion+WHOIS records

7,596+TLDs and ccTLDs tracked

52,000+Satisfied customers

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What is WHOIS API?

WHOIS API is a consumption model variant that gathers a variety of domain ownership and registration data points from a comprehensive WHOIS database. Developers can integrate WHOIS API into existing internal systems and commercial applications using client libraries and integration modules.

Comprehensive across TLDs

Our WHOIS repository contains information from millions of active domain and subdomain records that cover more than 7,596 generic (gTLDs) and country-code top-level domains (ccTLDs) and second-level domains (ccSLDs).
Unified and fit for purpose

Our WHOIS data can be quickly integrated into different internal systems to speed up its use by various stakeholders.
Handy

Need data viewable in either Extensible Markup Language (XML) or JavaScript Object Notation (JSON)? Our API provides both output types.
RDAP-ready

You can retrieve registration data via WHOIS or RDAP using a simple parameter toggle. WHOIS API also includes an automatic RDAP fallback for uninterrupted data delivery.

Practical usage

Cybercrime prevention

Digital forensics and incident response (DFIR) and other cybersecurity consultants can rely on WHOIS API to provide clients with easy-to-read lists of domains that may have ties to cybercrime, thus allowing them to enhance their cyber defense. This information could be particularly useful in mitigating phishing and other malware-enabled attacks.

Investigating and curbing cybercrime

Infosec professionals can work with WHOIS API to enhance their solutions and services and protect users against spam, dangerous websites, network infiltrations, and other online misdeeds as well as to investigate third-party risks.

Law enforcement

Law enforcement agents can use WHOIS API as a tool for investigations to find IP addresses, websites, and domains sharing attributes with criminals’ online networks.

Monitoring domain changes

Domainers can determine if a domain name is available and keep up with registration changes by working with WHOIS API. They can see all historical changes to particular domains with a simple search while the monitoring functionality lets them stay updated on the most recent domain changes.

Domain appraisal

Domain investors find WHOIS information helpful when tracking the competition and looking for new investment opportunities.

Domain transfer

Domain brokers and registrars can rely on WHOIS API to efficiently manage domain name ownership transfers.

DevOps

DevOps professionals can use WHOIS data to build new features and enrich other data sources as part of their software development and IT operations.

Payment processing

Payment processors and banks can prevent transaction fraud by looking out for customer information discrepancies and thwart malicious actors with the help of WHOIS API.

Marketing research

WHOIS API simplifies marketing research by allowing you to gather domain ownership information for statistical analyses. It also helps you make tailor-fit marketing strategies and campaigns for various user bases and identify otherwise-untapped opportunities.

Brand protection

WHOIS data enables brand agents to spot potential instances of trademark infringement like using blatantly similar, copycat, or duplicate domain names. This information can also be used with Website Categorization products to gather greater context around a domain.

Sales

Know your customers and prospects better with WHOIS API’s domain ownership information. Make your outreach efforts easier by using the contact details in domain records.

Download an exhaustive WHOIS database for your business needs

Our database comes in the form of CSV files and MySQL dumps for maximum compatibility and fast integration into existing systems.

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Simplify your work

We provide extensions for major open-source threat intelligence platforms. Integrate WHOIS API into your applications in minutes.

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Justin Paine

Cybersecurity developer

DomainHunter

“In my specific use case, WhoisXML API generously supported my independent security research. I created a Worker wrapper around their WHOIS API to query and extract the exact data points needed for this project.”

Sharad Agarwal

PhD student

University College London (UCL), Department of Computer Science

“WHOIS API is easy to use and provides the required results, which helped us understand the infrastructure criminals abuse to host malicious domains and conduct smishing. The implementation using the API documentation is straightforward.”

Kim Kok

Vice President

Core4ce

“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.”

Goo Dong-eon

CBO

Logpresso

“WhoisXML API is the leading provider of comprehensive domain, IP, DNS, and cyber threat intelligence. Through the collaboration between the two companies, we will provide various solutions to swiftly detect and respond to advanced cyber threats.”

Oliver Friedrichs

Founder and CEO

Pangea

“Our partnership with WhoisXML API brings their unique dataset to strengthen the bench of threat intel providers on Pangea. WhoisXML API is one of the most comprehensive and accurate sources of WHOIS data available.”

Sharada Jayaprakash

Senior Manager, Connector Engineering

Cyware

“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.”

Michael Bazzell

Owner

IntelTechniques

“The WhoisXML History API has been a game changer for our online investigations, trainings, and books. We have uncovered the true owners behind numerous malicious domains, even though they currently possess "private" Whois registration.”

Flavio Critelli

Distinguished Professor of Digital Forensics

University of Perugia

“Whois XML is one of the most important tools we use for domain intelligence in the Bachelor's Degree program in Investigation and Security Sciences at the University of Perugia. In particular, we appreciate the reverse research from IP to Domain and Whois with query filters. The tool is comprehensive, providing detailed information such as phone numbers, names, and other details from Whois records. While many Whois records are now covered by privacy regulations, WhoisXML API provides access to all historical WHOIS records.”

Michael Roberts

Founder & Private Investigator

Rexxfield

“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.”

Loonie Reed

Certified Fraud Examiner and Computer Forensic Examiner

“The consistent and structured data provided by WhoisXML API made it possible to group and identify who is behind suspected fraudulent websites, being able to search by phone number, address or e-mail address used in the domain registration.”

Yannick Delsahut

CEO

Goldstark

“I appreciate your products that are useful for checking domain expiration dates.”

Christine Bejerasco

Senior Analyst

F-Secure Corporation

“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.”

Rich Sutton

VP of Engineering

Proofpoint

“WhoisXML API’s domain intelligence allows us to quickly integrate WHOIS lookups into our security heuristics and algorithms without having to worry about hosting services, staging and merging data, and the complicated task of normalization.”

Mohammad Ismail Daud

Student

UC Davis

“I used WHOIS API and Website Categorization API. Both tools are simple and straightforward to use. Some API providers have extra bells and whistles that they force you to use, but WhoisXML API is really easy to work with. It’s stable, and I can trust that it’s not going to flatline later.”

Kieran Kennedy

Head

Snowflake Marketplace

“Keeping track of new domain registration activity is essential in today's digital economy. We look forward to continuing our collaboration with WhoisXML API to help customer leverage critical domain insights in a secure cloud environment that aligns with their data privacy and governance requirements.”

Larry Cameron

President and Founder

Paradigm Intelligence Ltd

“WhoisXML API is amazing for checking out the historic registration information of a domain, pivoting to locate the alternate registrations with the same details and also my cyber investigations. The data proved very useful when investigating pig butchering scams and domains that host child abuse material.”

Jacob Waltz

CEO/Founder

Intraframe

“Very useful for investigations, we can go back in history and see when domains were registered and who owned them at a certain time.”

David Pearson

CEO/Founder

Bayse Intelligence

“WhoisXML API builds out data sets that help users correlate attack infrastructure with related IP and WHOIS information.”

WHOIS / WHOIS History

DNS / DNS History

IP Geolocation / IP Netblocks

Domain/WHOIS

DNS/IP

Intelligence

Other

Domain/WHOIS

DNS/IP

Intelligence

Other

Domain/WHOIS

DNS/IP

Intelligence

Other

Research

Monitoring

White-Label

WHOIS API offers unified & consistent data

What is WHOIS API?

Comprehensive across TLDs

Unified and fit for purpose

Handy

RDAP-ready

Practical usage

Cybercrime prevention

Investigating and curbing cybercrime

Law enforcement

Monitoring domain changes

Domain appraisal

Domain transfer

DevOps

Payment processing

Marketing research

Brand protection

Sales

Download an exhaustive WHOIS database for your business needs

Simplify your work

Get 500 free API credits. No credit card required.

Trusted by the smartest companies

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