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How To Build An App That Performs A Whois Query Via Whois API

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Domain names are an important tool for identifying and managing assets on the internet. Querying the registration information of a domain name is of great importance in obtaining important information such as ownership, contact information, registration date, and even the last update associated with that domain name. Especially in commercial activities on the internet, having accurate and up-to-date information is critical for businesses to protect their reputation and effectively manage their digital assets. Today, web services such as Whois API appear as services that offer businesses and developers the ability to query domain names.

Whois API, one of today’s most effective services, allows us to automatically query and obtain information about domain name records. These APIs often provide access to large databases. Whois API users can easily obtain important information such as domain name owner, contact information, and registration date through programs or systems by making automatic queries. In this way, the management and security of assets on the Internet can be ensured more effectively. In this article, we will take a closer look at the Whois API and learn how to use it.

Performing A Whois Query

Performing a Whois query is a simple process that can be completed in just a few steps. The first step is to find a reliable Whois lookup tool. Many Whois lookup tools are available online, such as APILayer Whois API, WhoisXY, and Whoisology. Once you have found a Whois lookup tool, enter the domain name or IP address into the search field, and there you go.

The results of the Whois query will provide you with information about the domain name’s owner or IP address, contact information if access is given, and the registration data. 

With this information, you can determine if the domain name or IP address is currently in use, and if so, who owns it and how to contact them.

What Is Whois API?

Whois API is a simple, free, and easy-to-use API that allows you to perform a Whois query on any domain name. It is a product of APILayer, the most popular API marketplace in that market. This can be useful for finding out who owns a domain name and checking if a domain name is available. The API is accessed via a simple URL, and results are returned in JSON format.

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This API is also a free web service. It offers its users a free usage limit of up to 3,000 API calls per month. Additionally, its paid plans start at $4.99 per month for 150,000 API calls per month.

What are the Popular Whois API Services?

There are many different ways to build a whois query application. Here are some examples of whois apps that perform well:

  • Whois API by APILayer: This simple API allows you to query the Whois database from your site or application. It provides results in both JSON and XML formats. 
  • WhoisXML: This is an XML-based whois service that provides detailed information about domains, IP addresses, and registrars. It also offers an easy-to-use API for integration into your application. 
  • WhoisJS: This JavaScript library makes it easy to query the Whois database from your website or application. 
  • WhoisQ: This simple online tool allows you to perform whois queries from your web browser. 

How To Integrate Whois API?

As you know, APIs are designed to be flexible and portable. Our Whois API by APILayer is simple and easy to integrate regardless of your technology. Whether you want to build your free domain discovery platform or try to check thousands of domains’ availability for any reason, Whois API by APILayer will help you. Whois queries are pretty simple to code, but when you deal with thousands of Whois queries daily, it becomes complicated since NIC servers have strict rate limits. 

Whois API uses API access keys to authenticate requests. After signing up, you can view and manage your API keys on the accounts page.You can send call requests to the API endpoints with your API access key.

Here you can check if a domain name is available for purchase or not with this API endpoint.

JSON Response:

How to Integrate an API in Delphi?

Be sure to download the Delphi Community Edition and create a new multi-device application using Delphi where you can build and deploy your app to iOS, Android, Windows, macOS, and Linux using a single source code.

After creating a new multi-device application using Delphi, you can design your user interface similar to this one.

a form application for whois query

After designing and putting the REST Client components, you can write this code so that you can check any domain names that you want:

response of whois api query in a form application


In summary, Whois queries are critical for querying and verifying the registered information of internet domain names. It is an indispensable tool, especially for businesses, security experts, and brand owners, in areas such as domain name management, security control, and brand monitoring. At this point, tools such as the Whois API offered by APILayer make these processes faster and more efficient by automating these queries and providing access to large databases.

Get started with the best Whois API for free with up to 3,000 API requests per month!


Q: How does Whois API work?

A: Whois API is used to query registered information associated with a domain name or IP address. Users can access this information by requesting the Whois information of a specific domain name or IP address via the API. The API typically works over HTTP requests and allows users to make automated queries.

Q: What information is needed to use the Whois API?

A: Basic information such as domain name or IP address is usually required to use the Whois API. Users can obtain relevant Whois information by passing this information to the API when making a query. Additionally, some API providers may also request extra parameters or API keys.

Q: What are the popular use cases for the Whois API?

A: Some popular use cases of the Whois API are: For domain name verification and review, users can access up-to-date information about a domain name by querying details such as the owner of a domain name, registration date, and contact information. Additionally, in the field of security control and threat detection, security experts and network administrators can use this API to examine security information associated with IP addresses and domain names and detect potential threats.

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