Making requests | Documentation | Brand Alert API | 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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Predictive Threat Intelligence Feeds
Predictive Threat Intelligence Feeds

Predictive threat intelligence is your best first line of defense. Subscribe to the feeds to strengthen your cybersecurity posture. 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.

Discover what you really pay for when buying commercial Internet intelligence data.

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Making requests Output format Error codes Server-to-Server OAuth
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Making requests

API endpoint

POST https://brand-alert.whoisxmlapi.com/api/v2
It takes up to a minute to activate your account after the registration.

Postman collection

Postman is a desktop and web application that allows you to make requests to an API from a graphical user interface. We recommend using Postman with WhoisXML APIs endpoints when exploring the APIs functionality, as well as when you are troubleshooting issues with your application.

The WhoisXML API Postman collection is available at the following links:

The collection includes a preconfigured environment. You will need to set up the api_key variable to fire each request. Get your personal API KEY on the My products page. If you have questions related to the API, contact us.

POST request body sample

{
    "apiKey": "YOUR_API_KEY",
    "sinceDate": "2025-07-09",
    "mode": "purchase",
    "withTypos": false,
    "responseFormat": "json",
    "punycode": true,
    "includeSearchTerms": [
        "google",
        "blog"
    ],
    "excludeSearchTerms": [
        "analytics"
    ]
}

Headers

X-Authentication-Token

You can use this header or apiKey parameter for API calls.

Get your personal API KEY on My products page.

Input parameters

apiKey

Required. Get your personal API key on the My products page.
includeSearchTerms

Required. Array of search terms used as an AND statement. Maximum of four terms, one term per line. Case insensitive. Each search term can only contain one name, as any text following a dot (e.g., TLD) or preceding multiple dots (e.g., subdomain) will be ignored. Search terms are for both domain names and TLDs.
excludeSearchTerms

Optional. Array of search terms used as an AND NOT statement. Maximum of four terms, one term per line. Case insensitive. Each search term can only contain one name, as any text following a dot (e.g., TLD) or preceding multiple dots (e.g., subdomain) will be ignored. Search terms are for both domain names and TLDs.
sinceDate

Optional. Date in "YYYY-MM-DD" format.

Allowed dates are in the [Today minus 14 days — Today] interval.

Yesterday's date by default. This API uses data from Newly Registered Domains, and yesterday's date must be used to return results from the latest WHOIS records.

Note that the results for yesterday are usually available between 10-12AM UTC.

If present, search through activities discovered since the given date. Sometimes there is a latency between the actual added/renewal/expired date and the date when our system detected this change. We recommend using this field in your monitoring tools for filtering daily changes.
mode

Optional.

preview – return only the number of domains. No credits deducted.

purchase – return the actual list of domains (limited to 10,000). 1 request costs 10 DRS credits.

Acceptable values: preview | purchase

Default: preview
withTypos

Optional. If true, the search terms set will be enriched with their possible typos. For example, for the term 'google', the typos might be: 'goigle', 'gokgle', 'golgle', 'gopgle', 'goglee', 'gooogle' etc.

Acceptable values: false | true

Default: false

With typos included - 1 request costs 300 DRS credits.

Learn more: Typo generation FAQ
punycode

Optional. If true, domain names in the response will be encoded to Punycode.

Acceptable values: false | true

Default: true
responseFormat

Optional. Response output format.

Acceptable values: json | xml

Default: json

Free access

After Sign Up you automatically get a free subscription plan limited to 500 DRS credits.

Usage limits and requests throttling

The maximum number of requests per second is 30. In case that the limit is breached, your subsequent requests will be rejected until the next second.

This API is also available with a dedicated load balancer and premium endpoint to enable faster querying as part of our Premium API Services and Enterprise API Packages.