Domains & Subdomains Discovery API | WhoisXML API

Find domains and subdomains related by specific terms in their hostnames

With one API call, you will get a list of all linked domains and subdomains containing specified terms.

Get started

100 free credits monthly. No credit card required.

2.3 B+Subdomains
582 M+Domains tracked
2,864+TLDs

Benefits

  • Complete and precise

    Our Domains & Subdomains Discovery API works for nearly all top-level domains (TLDs), which now exceeds 2,864.

  • Based on up-to-date data

    All domains and subdomains that appear in search results come from a massive database compiled with over 10 years of data crawling, refreshed daily.

  • Unified results

    All information is well-parsed and normalized into either Extensible Markup Language (XML) and JavaScript Object Notation (JSON) format for easy integration with your business processes.

Practical usage

Cybercrime prevention

Cybercrime prevention

Need to know which domains and subdomains may have ties to cybercrime? Domains & Subdomains Discovery API data can help mitigate phishing, malware-enabled, and other attacks.

Cybersecurity solution enhancement

Want to enhance cybersecurity solutions in development? Integrate Domains & Subdomains Discovery API into your solutions and services to better protect your customers against harmful communications and websites, vulnerability exploits, and other threats.

Expand blacklists

Even by merely examining lists of domains and subdomains, you can strengthen protection by including all suspicious entities, even those not identified as indicators of compromise (IoCs), in your blacklists to prevent possible harm.

Marketing research

Need a hand in getting to know your competitors better? Scrutinize their recently-created domains and subdomains to identify potential business expansion avenues. The results can be good jumping-off points for market prospecting and understanding which products are part of an organization’s tech stack, as shown by the presence of certain product names in subdomains.

Marketing research
Brand protection

Brand protection

Want extra protection from trademark and copyright violators? Ensure that lookalike domains cannot adversely affect your brand reputation by fooling your customers and audiences into thinking they are dealing with you. Take action against cybersquatters and fraudsters who aim to benefit from your new product and service launches, settlement initiatives, and other high-profile activities.

Domains & Subdomains Discovery API | WhoisXML API

Get 100 free credits monthly. No credit card required.

Get started

Trusted by
the smartest
companies

You may be interested

Website Categorization
Website Categorization

Define website category of the given domain.

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 Registered Domains
Newly Registered Domains

Keep track of the best business opportunities online.

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
Brand Alert
Brand Alert

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

Learn more
Website Contacts
Website Contacts

Get full contacts data of the given domain.

Learn more
All Registered Domains
All Registered Domains

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

Learn more
IP Geolocation
IP Geolocation

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

Learn more
Reverse WHOIS
Reverse WHOIS

Find connections between various domains, individuals and organizations.

Learn more
Registrant Alert
Registrant Alert

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

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
Reverse NS
Reverse NS

Find all domains that use the same name server.

Learn more
Domain Availability
Domain Availability

The most accurate domain availability checker offered on the market.

Learn more
Subdomains Lookup
Subdomains Lookup

Discover subdomains related to the target domain name.

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
WHOIS Search
WHOIS Search

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

Learn more
Reverse MX
Reverse MX

Reveal all the domains that use the same mail server.

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

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

Learn more
Email Verification
Email Verification

Ensure the validity and quality of any email address.

Learn more
DNS Lookup Services
DNS Lookup Services

Identify who is hosting a particular domain name or website.

Learn more
Threat Intelligence Data Feeds
Threat Intelligence Data Feeds

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

Learn more
Screenshot Service
Screenshot Service

Instantly get a screenshot of any web page.

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

Get insights for the new business registered on the web.

Learn more
Reverse IP/DNS
Reverse IP/DNS

Find relations like ownership between hostnames and IPs.

Learn more
US Internet Retailers Database
US Internet Retailers Database

Get access to the biggest US Internet Retailers Database.

Learn more
IP Netblocks
IP Netblocks

Find out which IP range the particular IP belongs to.

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

Enterprise API Packages

Annual WhoisXML API access subscriptions are available. Pay based on the number of queries measured monthly at per-minute rates. Our predictable pricing structure allows you to stay on budget.

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