Domains & Subdomains Discovery Lookup | 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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Monitoring
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WhoisXML API Predictive Threat Intelligence
Predictive Threat Intelligence

Detect and block access to and from dangerous domain names before malicious actors can weaponize them. Contact us today for more information.

WhoisXML API Internet Infrastructure
Internet Infrastructure

Unlock integrated intelligence on Internet properties and their ownership, infrastructure, and other attributes.

Enterprise API Packages
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.

Multi-Level API User Administration Now Available - Manage individual API keys for team members in your organization.

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Domains & Subdomains Discovery Lookup: Get lists of domains or subdomains containing a specified term

Advanced Search

List all domains or subdomains that include a given term for use cases such as asset discovery, brand protection, and phishing prevention. Test our Domains & Subdomains Discovery Lookup now. Download our product sheet to learn more.

2.3 Billion+Subdomains
1 Million+Subdomains discovered daily
52,000+Satisfied customers
14+Years of data crawling

What is Domains & Subdomains Discovery Lookup?

Domains & Subdomains Discovery Lookup allows you to identify all domains and subdomains that contain specific terms. You can discover domains only, subdomains only, or both. Also, you can specify where the search term should be placed in the domain name: start with, end with, contains, and so on, to narrow down the results according to your needs. We provide the most complete and up-to-date information about all domains and subdomains for 7,596 TLDs in a convenient and unified format. We have been collecting data for more than 10 years, adding an average of more than 1 million newly discovered subdomains daily.

Domains & Subdomains Discovery Lookup

Practical usage of a subdomain list

Enrich cybersecurity research

Enrich cybersecurity research

Obtain extensive lists of domains and subdomains with hostname terms related to instances of cybercrime, even if they are not included yet as indicators of compromise (IoCs). Use them to protect users against harmful spam, malicious websites, network infiltration, and other attacks.

Improve your Marketing research

Know what competitors are up to based on their subdomain creations and the presence of third-party applications’ names in subdomains.

Improve your Marketing research
Protect your brand

Protect your brand

Thwart brandjackers and copyright and trademark infringers from violating your ownership rights and damaging your brand reputation. Lookalike domains and subdomains can trick some users into thinking they are dealing with you when they are not.