Reverse WHOIS Lookup: Identify all domains linked by a specific WHOIS record detail

Find all domain names using a given WHOIS record data point like an email address, registrant name, or company name. Test our Reverse WHOIS Lookup now. Download our product sheet to learn more.

774 Million+Domains tracked

25.5 Billion+WHOIS records

7,596+TLDs and ccTLDs tracked

52,000+Satisfied customers

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.

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 25.5B+ 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

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.

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.

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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.”

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.”

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

Reverse WHOIS Lookup: Identify all domains linked by a specific WHOIS record detail

What Is a Reverse WHOIS Lookup?

Why use Reverse WHOIS Lookup?

Accurate

Comprehensive

Flexible

Easy to use and share

Practical usage of a reverse domain lookup tool

Deepen cybercrime investigations

Improve threat hunting efforts

Enhance brand protection strategies

Get 500 free API credits. No credit card required.

Trusted by the smartest companies

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