Domains & Subdomains Discovery Service | WhoisXML API
Products APIs Data Feeds Web Tools Domain Research & Monitoring Enterprise Packages
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.

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

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API Lookup Suite Pricing

Domains & Subdomains Discovery Service allows you to identify all domains and/or subdomains connected by hostname terms

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500 free API requests. No credit card required.

2.3 Billion+Subdomains
1 Million+Subdomains discovered daily
52,000+Satisfied customers
14+Years of data crawling

Our Domains & Subdomains Discovery Service product line includes:

Lookup

Just take a hostname search string and instantly get a list of connected domains and subdomains. Get more accurate results according to your needs using advanced search options.

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Domains & Subdomains Discovery Lookup | WhoisXML API
Domains & Subdomains Discovery API | WhoisXML API

API

With one API call, you will get a list of all related domains and subdomains that contain specified hostname strings.

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Benefits of Domains & Subdomains Discovery Service

  • Comprehensive and accurate

    Domains & Subdomains Discovery Service supports nearly every top-level domain (TLD), now numbering in excess of 7,596.

  • Up-to-date

    All of the service’s search results are the product of 14+ years’ worth of data crawling and aggregation with daily updates. Our database is expanding at a rate of 1M newly discovered subdomains per day.

  • Well-Parsed

    We normalize and parse our data to give users results in ready-to-use Extensible Markup Language (XML) and JavaScript Object Notation (JSON) files integrable with any business process.

Practical usage

Prevent Online Counterfeiting

Collate comprehensive lists of domains and subdomains possibly connected to ongoing counterfeiting campaigns. Use the campaign’s target brand or company name as a search string on Domains & Subdomains Service to find web properties that can serve as potential vehicles for the threat.

Protect Your Brand

Find out if threat actors could be spoofing your brand or company through look-alike websites and web pages. Use your brand or company name as a search string to compile a list of web properties that may not be under your organization’s control to ensure they are not used to host phishing or pharming sites or pages.

Uncover DNS Trends

Get the lowdown on emerging domain registration trends that could help you uncover yet-unreported threats or business opportunities.

Enhance Service Discovery

Learn more about your clients’ or partners’ services by looking into their existing subdomains. Subdomain details can also allow you to monitor the competition or improve your software-as-a-service (SaaS) offerings to get a bigger market share.

Domains & Subdomains Discovery Service | WhoisXML API

Get 500 free API credits. No credit card required.

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