Reverse WHOIS Lookup by a domain owner’s name, etc. | 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.

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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.

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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.

Threat Intelligence Analysis
Threat Intelligence Analysis

Carry a complete threat intelligence analysis for a given domain or IP address and get access to a report covering 120+ parameters including IP resolutions, website analysis, SSL vulnerabilities, malware detection, domain ownership, mail servers, name servers, and more.

Threat Intelligence APIs
Threat Intelligence APIs

Gather threat intelligence via API calls covering Domain’s Infrastructure analysis, SSL Certificates Chain, SSL Configuration Analysis, Domain Malware Check, Connected Domains, and Domain Reputation Scoring.

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Threat Intelligence Data Feeds

Bolster enterprise security with our feeds covering Typosquatting domains, Disposable domains, Phishing URLs, Domain & IP reputation, Malicious URLs, Botnet C&C, and DDoS URLs.

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Reverse WHOIS Lookup: List all domains linked by an owner’s name, an email address, or other WHOIS detail

With a registrant’s name, a company name, an email address, or other search terms on hand, you can find all domain names that contain the queried term in their WHOIS records.

11.5+ billion Historic WHOIS Records
582+ million Domains tracked
2,864+ TLDs tracking
10+ years of data crawling

What Is a Reverse WHOIS Lookup?

A reverse WHOIS lookup is a means to retrieve all domain names containing your search term in their WHOIS records. With just a single piece of information, you can already retrieve relevant domains to get more insights for cybercrime investigations, market research, and threat hunting efforts.

Reverse WHOIS Lookup

Why use Reverse WHOIS Lookup?

  • Accurate

    Reverse WHOIS Lookup calls data from a WHOIS database that gets updated daily to ensure data accuracy and relevance.

  • Comprehensive

    Our WHOIS database contains more than 11.5B+ historical WHOIS records — a result of over a decade of data crawling.

  • Flexible

    You can choose any WHOIS record detail as a search term to pool all related domains.

  • Easy to use and share

    Reports from Reverse WHOIS Lookup come with unique URLs, allowing you to share them with colleagues and relevant stakeholders easily.

Practical usage of a reverse domain lookup tool

Deepen cybercrime investigations

Deepen cybercrime investigations

  • All cybercriminals leave digital breadcrumbs behind. Use them to list all related domain names that can uncover ties to specific attackers or campaigns. Combine results with those from other tools such as DNS Lookup, Reverse IP/DNS Lookup, Reverse MX Lookup, and Reverse NS Lookup for even more exhaustive findings.
  • Create attack profiles with just an attacker’s name, alias, email address, or phone number. Reverse WHOIS Lookup lets you retrieve associated domains that could make up a cybercriminal’s infrastructure.

Improve threat hunting efforts

  • Add one more data source to your threat intelligence sources. List all domain names connected to a campaign, threat actor, or criminal enterprise.
  • Identify other unreported threat sources using known indicators of compromise (IoCs) as search terms.
Improve threat hunting efforts
Enhance brand protection strategies

Enhance brand protection strategies

  • Check out potential trademark infringers by using your brand or trademark as a search term. For even more details, use Reverse WHOIS API or Reverse WHOIS Search.
  • Catch copycats and fraudsters red-handed by using a known threat actor’s name as a search term. Reverse WHOIS lookups can improve your cybersquatting protection efforts and help you gather evidence for litigation.

From one or several unique identifiers and terms present in a WHOIS record, get a list of all connected domain names with our new Domain Research Suite (DRS) dashboard.

Fast, intuitive and responsive.

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Reverse WHOIS Search | Domain Research Suite | WhoisXML API
Reverse WHOIS Lookup | WhoisXML API

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