Domain Lookup API

Domain Lookup API

The Domain Lookup API provides developers with two endpoints to check domain availability and perform WHOIS domain lookup.

API description

About the API:

The Domain Lookup API is a powerful tool that provides developers with two endpoints to check domain availability and perform WHOIS domain lookup.

The first endpoint of the Domain Lookup API enables users to check domain availability, including domain validation, expiration, and pricing.

The second endpoint of the Domain Lookup API allows users to perform WHOIS domain lookup.

Overall, the Domain Lookup API is a versatile tool that provides users with essential domain information that can help them make informed decisions. The API's ease of use, reliability, and rich features make it a valuable resource for developers, marketers, and business owners looking to optimize their online presence.

What your API receives and what your API provides (input/output)?

It will receive a parameter and provide you with a JSON.

What are the most common uses cases of this API?

  • Domain registration - developers can use the API to check the availability of a domain name before registering it.
  • Domain transfer - businesses can use the API to check the expiration date and ownership details of a domain before transferring it to a new registrar.
  • SEO analysis - marketers can use the API to check the age, authority, and backlinks of a domain before launching an SEO campaign.
  • Competitive analysis - businesses can use the API to check the domain registration details of their competitors to identify potential partnership opportunities or areas for improvement.
  • Cybersecurity - developers can use the API to identify potential domain-related security risks, such as phishing attacks or domain hijacking.
  • Brand management - businesses can use the API to monitor the registration of domains that contain their brand name to prevent unauthorized use.
  • Domain brokerage - domain brokers can use the API to check the availability and registration details of domains before brokering a sale.
  • Domain valuation - domain investors can use the API to assess the value of a domain by checking its age, authority, backlinks, and other quality aspects.
  • Intellectual property protection - lawyers and trademark holders can use the API to monitor domain registrations that contain their registered trademarks.
  • Market research - businesses can use the API to gather market insights by analyzing the registration details and trends of domains in a specific industry or niche.

Are there any limitations to your plans?

Basic Plan: 5 Requests Per Second.

Pro Plan: 10 Requests Per Second.

Pro + Plan: 10 Requests Per Second.

API Documentation


The Check Domain Availability endpoint of the Domain Lookup API enables users to validate a domain's availability and retrieve various domain-related data by providing the domain URL.

For example:


Check Domain Availability - Endpoint Features
Object Description
domain [Required] Domain. For example:
currency [Optional] Currency for pricing. ISO 4217 Currency Code. For example: USD
Test Endpoint


                                                                                                                                                                                                                            {"status":"OK","request_id":"977a031b-579a-4cb1-a64e-65290e885b5f","parameters":{"domain":"","currency":"USD"},"data":{"domain":"","sld":"applesupport","tld":"app","valid":true,"available":true,"register_price":"0","purchase_price":"0","transfer_price":"14","renew_price":"14","currency":"USD","is_premium":false,"is_aftermarket":false,"tld_requirement":"HSTS_PRELOAD","whois_privacy_offered":true,"domain_positives":["Recent worldwide popular tld","Correct spelling","Okay transcribability"]}}

Check Domain Availability - CODE SNIPPETS

curl --location --request GET '¤cy=Optional' --header 'Authorization: Bearer YOUR_API_KEY' 


The Check Whois Domain endpoint of the Domain Lookup API enables users to perform a WHOIS domain lookup by providing the domain URL.


Check Whois Domain - Endpoint Features
Object Description
domain [Required] The domain to perform WHOIS lookup. For Example:
Test Endpoint


                                                                                                                                                                                                                            {"status":"OK","request_id":"f1a068f9-d73a-4c81-9725-47f6655ccca1","parameters":{"domain":""},"data":{"domain":"","sld":"netflix","tld":"com","whois":"Domain Name:\nRegistry Domain ID: 1404215_DOMAIN_COM-VRSN\nRegistrar WHOIS Server:\nRegistrar URL:\nUpdated Date: 2021-10-09T09:37:28+0000\nCreation Date: 1997-11-11T05:00:00+0000\nRegistrar Registration Expiration Date: 2023-11-10T00:00:00+0000\nRegistrar: MarkMonitor, Inc.\nRegistrar IANA ID: 292\nRegistrar Abuse Contact Email: [email protected]\nRegistrar Abuse Contact Phone: +1.2086851750\nDomain Status: clientUpdateProhibited (\nDomain Status: clientTransferProhibited (\nDomain Status: clientDeleteProhibited (\nDomain Status: serverUpdateProhibited (\nDomain Status: serverTransferProhibited (\nDomain Status: serverDeleteProhibited (\nRegistry Registrant ID: \nRegistrant Name: Domain Administrator\nRegistrant Organization: Netflix, Inc.\nRegistrant Street: 100 Winchester Circle, \nRegistrant City: Los Gatos\nRegistrant State/Province: CA\nRegistrant Postal Code: 95032\nRegistrant Country: US\nRegistrant Phone: +1.4085403700\nRegistrant Phone Ext: \nRegistrant Fax: +1.4085403737\nRegistrant Fax Ext: \nRegistrant Email: [email protected]\nRegistry Admin ID: \nAdmin Name: Domain Administrator\nAdmin Organization: Netflix, Inc.\nAdmin Street: 100 Winchester Circle, \nAdmin City: Los Gatos\nAdmin State/Province: CA\nAdmin Postal Code: 95032\nAdmin Country: US\nAdmin Phone: +1.4085403700\nAdmin Phone Ext: \nAdmin Fax: +1.4085403737\nAdmin Fax Ext: \nAdmin Email: [email protected]\nRegistry Tech ID: \nTech Name: Domain Administrator\nTech Organization: Netflix, Inc.\nTech Street: 100 Winchester Circle, \nTech City: Los Gatos\nTech State/Province: CA\nTech Postal Code: 95032\nTech Country: US\nTech Phone: +1.4085403700\nTech Phone Ext: \nTech Fax: +1.4085403737\nTech Fax Ext: \nTech Email: [email protected]\nName Server:\nName Server:\nName Server:\nName Server:\nDNSSEC: unsigned\nURL of the ICANN WHOIS Data Problem Reporting System:\n>>> Last update of WHOIS database: 2023-04-26T19:07:44+0000 <<<\n\nFor more information on WHOIS status codes, please visit:\n\n\nIf you wish to contact this domain’s Registrant, Administrative, or Technical\ncontact, and such email address is not visible above, you may do so via our web\nform, pursuant to ICANN’s Temporary Specification. To verify that you are not a\nrobot, please enter your email address to receive a link to a page that\nfacilitates email communication with the relevant contact(s).\n\nWeb-based WHOIS:\n\n\nIf you have a legitimate interest in viewing the non-public WHOIS details, send\nyour request and the reasons for your request to [email protected]\nand specify the domain name in the subject line. We will review that request and\nmay ask for supporting documentation and explanation.\n\nThe data in MarkMonitor’s WHOIS database is provided for information purposes,\nand to assist persons in obtaining information about or related to a domain\nname’s registration record. While MarkMonitor believes the data to be accurate,\nthe data is provided \"as is\" with no guarantee or warranties regarding its\naccuracy.\n\nBy submitting a WHOIS query, you agree that you will use this data only for\nlawful purposes and that, under no circumstances will you use this data to:\n  (1) allow, enable, or otherwise support the transmission by email, telephone,\nor facsimile of mass, unsolicited, commercial advertising, or spam; or\n  (2) enable high volume, automated, or electronic processes that send queries,\ndata, or email to MarkMonitor (or its systems) or the domain name contacts (or\nits systems).\n\nMarkMonitor reserves the right to modify these terms at any time.\n\nBy submitting this query, you agree to abide by this policy.\n\nMarkMonitor Domain Management(TM)\nProtecting companies and consumers in a digital world.\n\nVisit MarkMonitor at\nContact us at +1.8007459229\nIn Europe, at +44.02032062220\n----\n"}}

Check Whois Domain - CODE SNIPPETS

curl --location --request GET '' --header 'Authorization: Bearer YOUR_API_KEY' 


API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Domain Lookup API REST API, simply include your bearer token in the Authorization header.


Header Description
Authorization [Required] Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

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