WHOIS API | 374M+ active domains & 7,596 TLDs tracked | WhoisXML API
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WHOIS / WHOIS History
WHOIS / WHOIS History

Provide current and historical ownership information on domains / IPs. Identify all connections between domains, registrants, registrars, and DNS servers.

DNS / DNS History
DNS / DNS History

Look into all current and historical DNS / IP connections between domains and A, MX, NS, and other records. Monitor suspicious changes to DNS records.

IP Geolocation / IP Netblocks
IP Geolocation / IP Netblocks

Get detailed context on an IP address, including its user’s geolocation, time zone, connected domains, connection type, IP range, ASN, and other network ownership details.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Access our web-based solution to dig into and monitor all domain events of interest.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Get access to a web-based enterprise-grade solution to search and monitor domain registrations and ownership details for branded terms, fuzzy matches, registrants of interest, and more.

Research
Monitoring
White-Label
WhoisXML API Predictive Threat Intelligence
Predictive Threat Intelligence

Detect and block access to and from dangerous domain names before malicious actors can weaponize them. Contact us today for more information.

WhoisXML API Internet Infrastructure
Internet Infrastructure

Unlock integrated intelligence on Internet properties and their ownership, infrastructure, and other attributes.

Enterprise API Packages
Enterprise API Packages

Our complete set of domain, IP, and DNS intelligence available via API calls as an annual subscription with predictable pricing.

Security Intelligence (SI) Suite
Security Intelligence (SI) Suite

Offers complete access to WHOIS, IP, DNS, and subdomain data for product enrichment, threat hunting and more.

Premium API Services
Premium API Services

Enjoy priority data access with our premium API services topped with extra perks including dedicated team support, enterprise-grade infrastructure, and SLAs for full scalability and high performance.

Multi-Level API User Administration Now Available - Manage individual API keys for team members in your organization.

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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
21.0 Billion+WHOIS records
7,596+TLDs and ccTLDs tracked
52,000+Satisfied customers
See all coverage stats

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.

  • Reliable and current

    Our WHOIS data is gathered in near-real-time, giving you exclusive access to accurate and updated information for better decision-making.

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.

Cybercrime prevention

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

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.

Payment processing
Social sciences

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

WHOIS API Splunk application tutorial WHOIS API WordPress plugin bestwhois - a command-line whois-like client

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

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WHOIS API | WhoisXML API

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Premium API Services

Our APIs are available in an enhanced version that offers better performance with a dedicated load balancer and a premium endpoint to enable faster throttling for large-scale API deployments.

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Enterprise API Packages

Do much more with our annual API subscriptions that cover WHOIS data and other types of domain, IP, and DNS intelligence. See how we can match your business planning and solution architecture requirements.

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WHOIS History API WHOIS API

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