WhoAPI offers 7 different APIs, start with our Whois API now!

Powering Domain
Intelligence

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7 Amazing APIs

Whois API • Domain Availability API • Domain Score API • Email Score API • IP Blacklist API • SSL API • Domain Age API

Whois API

WHOIS API

Delivers domain information for hundreds of millions domain names, across hundreds domains registrars and domain extensions

Email Score API

Email Score API

Our proprietary algorithm ranks email addresses from 0 to 100. Check if the email is temporary. Great for sales!

Past clients include

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Domain Availability API

Check whether domains are available for registration across hundreds of TLDs in real time. Ideal for registrars, website builders, marketplaces, SEO agencies and platforms that need fast and reliable domain availability checks at scale.

What can I build with Domain Availability API?
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Whois API

Retrieve WHOIS records, domain age, reputation signals, and related infrastructure data. Used by cybersecurity teams, fraud detection systems, and investigators to turn raw domain data into actionable intelligence.

Whois API

Serving Clients Around the World

We use WhoAPI Email Blacklist API as an integral part of our automated compliance system. This system enables us to identify potential risks to our network.”
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Dan Stevens CEO at Kickbox.com
We use WhoAPI Whois API to identify and generate indicators of compromise for further investigation. The information they provide are an essential datapoint.
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Jacques Erasmus King Inc.
For a few years now, we have been using the features of WhoAPI screenshot API successfully. With the new update even more efficiently.
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Bruno Rouget Belgian Entertainment
WhoAPI provides a tremendously valuable service – machine-readable WHOIS data! We’re using it for automatic checks of domain squatting around our trademarks.
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Oliver Keyes Wikimedia
I am always on a lookout for obscure APIs and want to get my hands on them before everybody else. Same with WhoAPI, only I used the heck out of them!
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Harper Reed Modest Inc.

What others are saying about us

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Fixthephoto.com

I like the speed of the provided API and the quality of its results. Besides, I was pleased by the fact that I was able to access multiple tools at once, which allowed me to reduce my expenses.

Review by Kate Gross
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Webmaster.Ninja

At Webmaster.Ninja we do not download the resulting thumbnails. We just use the direct links to images provided by the API. This is possible because WhoAPI stores images for 30 days and we update the thumbnails more frequently.

Read the review

Groundbreaking

Domain Intelligence
Research

Over the last decade, we’ve conducted several groundbreaking research, interviews and written several articles in the web hosting industry. Now we are taking this one step further.

WhoAPI Research
Whoapi Research
Whoapi -Domain owner manual

Domain Owner Manual

Domain Disclosure:
Dirty Dozen

Learn about the impact of domain names on your business. These domain name fundamentals, case studies, groundbreaking research and twelve unavoidable conclusions could save you thousands of dollars.

Download White Paper