Reverse WHOIS tools to find domains by registrant data | WhoisXML API

Reverse WHOIS tools and services help you find domain names connected by a registrant identifier

Reverse domain queries via lookups or API calls are useful to identify all domain records that correspond to search terms like a name, an email address, a phone number, etc.

Get started

100 free requests monthly. No credit card required.

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

Reverse WHOIS queries by registrant data can be done through:

Lookup

Use our handy lookup web interface to query your search term of interest and get a list of all domain names found in the last 7 days (i.e., for which the term appears in the domains’ WHOIS records). Include and exclude certain terms with the advanced lookup option.

Reverse WHOIS Lookup | WhoisXML API
Reverse WHOIS API | WhoisXML API

API

You can use Reverse WHOIS API to list linked domain names via API calls. We provide documentation and client libraries to facilitate integration.

Benefits

  • Establish all known domain name associations with individuals and organizations. Learn more about domain footprints with the consumption model — lookup or API — of your choice.

  • Narrow down your search results by employing filtering parameters to exclude terms that are not relevant to your query.

  • Go with any WHOIS detail you have on hand to run queries via Reverse WHOIS Lookup and make API calls with Reverse WHOIS API. You can use exact-match terms or fuzzy ones for broader results.

  • Results from our lookup tool and API are gathered from the most comprehensive historical WHOIS database on the market with daily updates. All the data returned is parsed, normalized, and consistently formatted.

Conduct advanced reverse WHOIS queries by registrant identifiers and much more with the Domain Research Suite (DRS) dashboard.

Fast, intuitive and responsive.

Get started
Reverse WHOIS Search | Domain Research Suite | WhoisXML API
Reverse WHOIS Overview | WhoisXML API

Get 100 free credits monthly. No credit card required.

Get started

Trusted by
the smartest
companies

You may be interested

Reverse WHOIS
Reverse WHOIS

Find connections between various domains, individuals and organizations.

Learn more
IP Netblocks
IP Netblocks

Find out which IP range the particular IP belongs to.

Learn more
Website Contacts
Website Contacts

Get full contacts data of the given domain.

Learn more
Newly Registered Domains
Newly Registered Domains

Keep track of the best business opportunities online.

Learn more
Website Categorization
Website Categorization

Define website category of the given domain.

Learn more
IP Geolocation
IP Geolocation

Find out the exact physical location of any IP address, email or domain name.

Learn more
Threat Intelligence Data Feeds
Threat Intelligence Data Feeds

Get the most relevant data to be ahead of emerging security threats.

Learn more
Reverse IP/DNS
Reverse IP/DNS

Find relations like ownership between hostnames and IPs.

Learn more
Brand Alert
Brand Alert

Monitor exact matches, variations and common misspellings of your brand name & trademarks.

Learn more
WHOIS Database Download
WHOIS Database Download

We provide complete and relevant domain WHOIS data which can be customized and easily integrated as per your business needs.

Learn more
Domains & Subdomains Discovery API
Domains & Subdomains Discovery API

Find domains and subdomains related by specific terms in their hostnames.

Learn more
Reverse NS
Reverse NS

Find all domains that use the same name server.

Learn more
All Registered Domains
All Registered Domains

Get a complete daily list of all the registered domains and zone files.

Learn more
Registrant Alert
Registrant Alert

Find out which domains were added or dropped by registrants, with given search criteria.

Learn more
Real-time Domain Registration
Real-time Domain Registration

Get data feeds of new registered domains along with their WHOIS data generated in real time.

Learn more
Domain Research Suite
Domain Research Suite

Enhance your domain research toolkit by our enterprise-grade web-based solution that helps you in searching...

Learn more
Screenshot Service
Screenshot Service

Instantly get a screenshot of any web page.

Learn more
US Internet Retailers Database
US Internet Retailers Database

Get access to the biggest US Internet Retailers Database.

Learn more
WHOIS Search
WHOIS Search

Get well-parsed and normalized WHOIS information for any domain name, IP address or email.

Learn more
Subdomains Lookup
Subdomains Lookup

Discover subdomains related to the target domain name.

Learn more
Email Verification
Email Verification

Ensure the validity and quality of any email address.

Learn more
Domain Reputation API
Domain Reputation API

Assess the domain's or IP addresses reputation and risk profile with a simple score based on a comprehensive...

Learn more
DNS Lookup Services
DNS Lookup Services

Identify who is hosting a particular domain name or website.

Learn more
Typosquatting Data Feed
Typosquatting Data Feed

Easily detect all typosquatting domain names as soon as they are registered each day.

Learn more
Newly Created Websites Data Feed
Newly Created Websites Data Feed

Get insights for the new business registered on the web.

Learn more
Domain Availability
Domain Availability

The most accurate domain availability checker offered on the market.

Learn more
Reverse MX
Reverse MX

Reveal all the domains that use the same mail server.

Learn more
Have questions?

We are here to listen. For a quick response, please select your request type or check our Contact us page for more information. By submitting a request, you agree to our Terms of Service and Privacy Policy.

Or shoot us an email to