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 Make a quick self-assessment to uncover all potential weak points, outdated software, or misconfigurations.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.
“We want to provide all Cyberscape users the ability to integrate relevant data for their cyber threat investigations. WhoisXML API provides unique data that will be helpful to the cyber threat investigation community, allowing analysts to shorten the cycle of understanding and mitigating threats.”
“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.”
















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Subdomains Lookup API
Get free access to our API. 500 free credits. No credit card required.