--- title: APIs | Knowledge Base description: Learn more about the specificities of our APIs. --- [Skip to content](https://knowledge.whoisxmlapi.com/apis#main-content) English Show submenu for translations ![Logo inline notagline (1)-1.png\]](https://knowledge.whoisxmlapi.com/hs-fs/hubfs/Logo%20inline%20notagline%20(1)-1.png?height=40&name=Logo%20inline%20notagline%20(1)-1.png) Open main navigation Close main navigation - English Show submenu for translations - Go to whoisxmlapi.com Go to whoisxmlapi.com What do you want to know? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://knowledge.whoisxmlapi.com/) 2. [APIs](https://knowledge.whoisxmlapi.com/apis) # APIs Learn more about the specificities of our APIs. - [Do your APIs integrate with enterprise security software?](https://knowledge.whoisxmlapi.com/api-enterprise-security-integrations) - [Where can I find documentation for all your APIs?](https://knowledge.whoisxmlapi.com/documentation-for-all-apis) - [I need faster API responses. Can you help?](https://knowledge.whoisxmlapi.com/faster-api-response) - [Where can I check API statuses and response time?](https://knowledge.whoisxmlapi.com/apis-response-time-status) - [Where can I find my API key?](https://knowledge.whoisxmlapi.com/where-can-i-find-my-api-key) - [FAQs on Paid API Subscriptions](https://knowledge.whoisxmlapi.com/paid-api-subscription-faq) - [APIs vs. Datafeeds: Which one is best for your company?](https://knowledge.whoisxmlapi.com/apis-vs-datafeeds) - [Why am I seeing a CAPTCHA request when using the API demo?](https://knowledge.whoisxmlapi.com/why-am-i-seeing-a-captcha-request-when-using-the-api-demo) - [Which of our APIs provide live queries?](https://knowledge.whoisxmlapi.com/which-apis-provide-live-queries) - [How can I update my subscription(s) on the API dashboard?](https://knowledge.whoisxmlapi.com/update-subscriptions-api) - [Do you have a script to hide my API key(s) when making queries?](https://knowledge.whoisxmlapi.com/do-you-have-a-script-to-hide-my-api-key) See less ▼ ## WHOIS API - [What is WHOIS API?](https://knowledge.whoisxmlapi.com/what-is-whois-api) - [Do you offer help to integrate WHOIS API?](https://knowledge.whoisxmlapi.com/whois-api-integration) - [Where can I find documentation for WHOIS API?](https://knowledge.whoisxmlapi.com/where-can-i-find-documentation-for-whois-api) - [Why does the WHOIS Lookup API return different results than Bulk WHOIS API?](https://knowledge.whoisxmlapi.com/why-does-the-whois-lookup-api-return-different-results-than-bulk-whois-api) - [What is the difference between the \_hardRefresh and preferFresh flags?](https://knowledge.whoisxmlapi.com/what-is-the-difference-between-the-_hardrefresh-and-preferfresh-flags) - [How old is the WHOIS record returned?](https://knowledge.whoisxmlapi.com/how-old-is-the-whois-record-returned) - [Why do I get inconsistent WHOIS record response?](https://knowledge.whoisxmlapi.com/why-do-i-get-inconsistent-whois-record-response) - [How do I check if a domain is registered or not?](https://knowledge.whoisxmlapi.com/how-do-i-check-if-a-domain-is-registered-or-not) - [Are there any TLDs that you don't support?](https://knowledge.whoisxmlapi.com/are-there-any-tlds-that-you-dont-support) - [Can I collect the IP address of a domain via WHOIS API?](https://knowledge.whoisxmlapi.com/can-i-collect-the-ip-address-of-a-domain-via-whois-api) See less ▼ ## WHOIS History API - [Is there a limit to the number of requests I can make via WHOIS History API?](https://knowledge.whoisxmlapi.com/is-there-a-limit-to-the-number-of-requests-i-can-make-via-whois-history-api) ## DNS Lookup API - [How does your DNS Lookup API work?](https://knowledge.whoisxmlapi.com/how-does-dns-lookup-api-work) - [Why can't I get SRV records populated when querying domains with DNS Lookup API?](https://knowledge.whoisxmlapi.com/why-cant-i-get-srv-records-populated-when-querying-domains-with-dns-lookup-api) ## IP Geolocation API - [Is there a limit to the number of requests I can make via IP Geolocation API?](https://knowledge.whoisxmlapi.com/is-there-a-limit-to-the-number-of-requests-i-can-make-via-ip-geolocation-api) ## Email Verification API - [Why would email messages bounce though the API finds that the email address exists?](https://knowledge.whoisxmlapi.com/why-emails-bounce-though-the-api-finds-address-existing) ## Domain Reputation API - [What do these warning messages mean for Domain Reputation API?](https://knowledge.whoisxmlapi.com/warning-messages-domain-reputation-api) ## Subdomain Lookup API - [I notice that subdomain discovery results can vary significantly between providers. Why is that?](https://knowledge.whoisxmlapi.com/why-subdomain-discovery-results-can-vary-significantly-between-providers) ## Reverse WHOIS API - [Can I use your reverse WHOIS service with ServiceNow Security Operations?](https://knowledge.whoisxmlapi.com/can-i-use-your-reverse-whois-service-with-servicenow-security-operations) - [NRD2](https://knowledge.whoisxmlapi.com/nrd2#main-content) - [Tutorials](https://knowledge.whoisxmlapi.com/nrd2#tutorials) - [General Support](https://knowledge.whoisxmlapi.com/general-support) - [WHOIS Domain Data](https://knowledge.whoisxmlapi.com/whois-domain-data#main-content) - [WHOIS vs. Historical WHOIS](https://knowledge.whoisxmlapi.com/whois-domain-data#whois-vs-historical-whois) - [Quarterly feeds](https://knowledge.whoisxmlapi.com/whois-domain-data#quarterly-feeds) - [WHOIS data fields](https://knowledge.whoisxmlapi.com/whois-domain-data#whois-data-fields) - [Bulk WHOIS Lookup](https://knowledge.whoisxmlapi.com/whois-domain-data#bulk-whois-lookup) - [DNS Data](https://knowledge.whoisxmlapi.com/dns-data) - [APIs](https://knowledge.whoisxmlapi.com/apis#main-content) - [WHOIS API](https://knowledge.whoisxmlapi.com/apis#whois-api) - [WHOIS History API](https://knowledge.whoisxmlapi.com/apis#whois-history-api) - [DNS Lookup API](https://knowledge.whoisxmlapi.com/apis#dns-lookup-api) - [IP Geolocation API](https://knowledge.whoisxmlapi.com/apis#ip-geolocation-api) - [Email Verification API](https://knowledge.whoisxmlapi.com/apis#email-verification-api) - [Domain Reputation API](https://knowledge.whoisxmlapi.com/apis#domain-reputation-api) - [Subdomain Lookup API](https://knowledge.whoisxmlapi.com/apis#subdomain-lookup-api) - [Reverse WHOIS API](https://knowledge.whoisxmlapi.com/apis#reverse-whois-api) - [Databases / Data Feeds](https://knowledge.whoisxmlapi.com/databases-data-feeds#main-content) - [Threat Intelligence Data Feeds (TIDF)](https://knowledge.whoisxmlapi.com/databases-data-feeds#threat-intelligence-data-feeds-tidf) - [IP Geolocation / IP Netblocks Databases](https://knowledge.whoisxmlapi.com/databases-data-feeds#ip-geolocation-ip-netblocks-databases) - [Legacy](https://knowledge.whoisxmlapi.com/legacy) - [Dev & Data Science Corner](https://knowledge.whoisxmlapi.com/dev-data-science-corner#main-content) - [Dev resources](https://knowledge.whoisxmlapi.com/dev-data-science-corner#dev-resources) - [Domain Research Suite (DRS)](https://knowledge.whoisxmlapi.com/domain-research-suite-drs-1) - [IP Data](https://knowledge.whoisxmlapi.com/ip-data) [![Chill listening crop-3](https://knowledge.whoisxmlapi.com/hs-fs/hubfs/Logo%20eye%20icon%20(1).png?width=37&height=24&name=Logo%20eye%20icon%20(1).png "Chill listening crop-3")](http://whoisxmlapi.com) Copyright © 2026, whoisxmlapi.com