Provide current and historical ownership information on domains / IPs. Identify all connections between domains, registrants, registrars, and DNS servers.
Look into all current and historical DNS / IP connections between domains and A, MX, NS, and other records. Monitor suspicious changes to DNS records.
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.
Access our web-based solution to dig into and monitor all domain events of interest.
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.
Detect and block access to and from dangerous domain names before malicious actors can weaponize them. Contact us today for more information.
Unlock integrated intelligence on Internet properties and their ownership, infrastructure, and other attributes.
Our complete set of domain, IP, and DNS intelligence available via API calls as an annual subscription with predictable pricing.
Offers complete access to WHOIS, IP, DNS, and subdomain data for product enrichment, threat hunting and more.
Enjoy priority data access with our premium API services topped with extra perks including dedicated team support, enterprise-grade infrastructure, and SLAs for full scalability and high performance.
Multi-Level API User Administration Now Available - Manage individual API keys for team members in your organization.
Learn MoreWith one API call, instantly get a list of all subdomains related to a given domain name to reveal a company’s entire web infrastructure. Use it to identify and fortify potential vulnerabilities.
Get started500 free API credits. No credit card required.
Our subdomains lookup intelligence reveals every subdomain a domain name has, including when these were last modified.
Query results with both parsed and raw fields are returned in popular formats—Extensible Markup Language (XML) and JavaScript Object Notation (JSON)—allowing for easy integration.
Our Subdomains Lookup API works for nearly all top-level domains (TLDs).
Use Subdomains Lookup API in addition to Domain Research Suite to correlate WHOIS records with subdomain intelligence when doing in-depth investigations and research.
Know all your network’s weakest points to fortify your cyber defense. Identifying all your subdomains and making sure these are sufficiently protected at all times is essential to optimize your cybersecurity posture.
Finding subdomains is an important step in the information gathering phase of a penetration test. Ensure that none of your unused or forgotten subdomains are left dangling, making them easy targets for attackers to gain unauthorized entry into your network.
Only by examining even the subdomains of suspicious sites can you truly stay protected from all kinds of possible harm. Include every malicious subdomain (even those not identified as indicators of compromise [IoCs]) in your blacklists for greater security.
Digging as deep as possible into your web infrastructure lets you evaluate all connected systems for vulnerabilities. Make a quick self-assessment to uncover all potential weak points, outdated software, or misconfigurations.
Screen your competitors' subdomain additions to understand their web infrastructure better.
Identify possible business development opportunities as subdomains can reveal the types of digital business partners a prospect is currently working with.
Build your own products and enrich them with our high-value data. Every API response is returned in JSON and XML formats, which is compatible with popular coding languages.
Our database comes in the form of daily and monthly comma-separated values (CSV) files and MySQL dumps. Get the most accurate and up-to-date subdomain data for easy integration into your platform.
Request a Quote“We did trials with WhoisXML API to make sure the data was truly resulting in successful takedowns. We were able to consistently discover and mitigate real threats as a result of using the products.”
Our APIs are available in an enhanced version that offers better performance with a dedicated load balancer and a premium endpoint to enable faster throttling for large-scale API deployments.
Learn moreGet the benefits of accessing up-to-date subdomain data along with all other sources of domain and IP intelligence. Subscribe to an annual plan that fits your business requirements now.
Learn moreGet free access to our API. 500 free credits. No credit card required.
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