Find all domain names
which contain a specified search terms
in their WHOIS records

Get started free

582M+
Domains tracked

2,864+
TLDs

6.7 Billion+
WHOIS records

Reverse WHOIS API is used to search for domain records based on particular search terms(s). A query can be created with search terms such as name, email, phone, address, etc. that are usually part of WHOIS record. Query result will be returned with all the domain records that correspond with the search terms used.

By using one or more unique identifiers or terms found in a WHOIS record, find all the domain names related to it with our new Domain Research Suite Dashboard.

Fast, intuitive and responsive

Get started

Benefits of Reverse WHOIS

Discover all domain names associated with an individual or an organization.
Find connections between various domains, individuals and organizations.
You may search by specific attributes in the Domain WHOIS Records. For example, search by registrant email/ registrant name.

Get Current as well as Historic Reverse WHOIS data.
Your search term can be an exact match or fuzzy match. For example, you may search for any registrant name that starts with the term "John", or search for any registrant email address that contains the term "xyz".
Search results can be filtered based on registration date or expiration date. For example, if you want records only within the last year, you can do that.

All of the WHOIS information is well parsed and normalized to a consistent format for easy integration with your business processes.
The query results are returned in popular XML & JSON formats.
Real-time WHOIS data ensures that only the most up to date and accurate information is delivered.

Practical Usage of Reverse WHOIS API Search

Cyber Security

Cyber Security researchers use Reverse WHOIS API for investigating & curbing cybercrime. Cyber Security and anti-malware solutions use Reverse WHOIS API to detect spam, malicious websites, intrusions, and other online misbehaviors.

Law Enforcement

Law enforcement agencies use Reverse WHOIS API to identify all of the connected domains, websites and IP addresses associated with fraudulent activities and criminals.

Brand Protection

Brand agents use Reverse WHOIS data to protect their intellectual property and check potential trademark infringements through searches to scope domain name similarities, duplicates, or copycats.

Cyber Fraud Detection

Payment processors and banks use Reverse WHOIS API to detect transaction fraud. Website owners and managers use Reverse WHOIS API to identify new business and partnership opportunities and to locate potential buyers through the contact details provided in the WHOIS database.

Marketing research

Website owners and managers use Reverse WHOIS API to identify new business and partnership opportunities and to locate potential buyers through the contact details provided in the WHOIS database.

Enterprise API Packages

API access through WhoisXMLAPI can be purchased as an annual subscription. The access pricing is based on the number of queries, which is measured monthly with per-minute rate limits. The pricing structure gives predictability to business planning and solution architecture.

Learn more

Trusted by
the smartest
companies

Give API a try

More options

Search terms:

Domains discovered:

Report price:

Try our Reverse WHOIS API for free