OAuth Domain Name Lookup Guide

In today’s digital landscape, the concept of OAuth and domain name lookup are intertwined in various applications and services. This comprehensive guide will delve into the intricacies of OAuth domain name lookup, discussing the key concepts and resources to help you navigate this domain with confidence.

OAuth Overview

OAuth (Open Authorization) is an open standard for authorization that enables secure access to resources on behalf of a resource owner. It is widely used in web applications and APIs to allow users to grant access to their data without sharing their login credentials.

OAuth and Domain Name Lookup

OAuth domain name lookup refers to the process of identifying the domain name associated with a user’s account or access token.

This information can be useful for various purposes, such as determining the user’s location, verifying the authenticity of the user, or providing a customized user experience.

how to perform OAuth domain name lookup

OAuth Domain Name Lookup is a way to check the availability of domain names on the internet. It helps users find a domain name that hasn’t been taken yet.

There is no database where one can look up names by the ID string.

However, to authenticate an app using Google OAuth, one can include the hd=”example.com” parameter in the URL to allow only a particular set of people having a specific “@example.com” domain to be able to obtain access tokens and stuff.

Whois Lookup API

The Whois Lookup API, provided by DomainTools, is a powerful tool for obtaining domain name ownership records and other registration details.

It is optimized to respond quickly and provides a wealth of information about a domain name or IP address. To use the API, you must provide your API credentials.

OAuth 2.0 and UserInfo Endpoint

OAuth 2.0 is a widely adopted standard for authorization. The UserInfo endpoint is part of the OpenID Connect standard and is used to retrieve user information from an OAuth 2.0 server.

This endpoint takes an access token and returns a JSON object containing various properties about the user, including their unique identifier (sub) and other profile information.

Google’s Tokeninfo Endpoint

Google’s Tokeninfo endpoint is used to verify the authenticity of an access token. It returns information about the token, such as its issuer and expiration time. This endpoint is particularly useful for testing and troubleshooting applications.

OAuth Consent Screen and Scopes

When publishing an app, you must configure an OAuth consent screen and select the appropriate scopes. Scopes define the level of access granted to your app. Always use the narrowest scopes possible to minimize the risk of data breaches.

Auth-Code and WHOIS Search

An Auth-Code (also known as an Authorization Code, Auth-Info Code, or transfer code) is a code created by a registrar to help identify the domain name holder. To perform a WHOIS search, visit https://whois.icann.org and enter the domain name you wish to look up. The WHOIS search will provide information about the domain name, including the registrar name.

In conclusion, OAuth domain name lookup is a crucial aspect of modern web applications and APIs. By understanding the concepts and resources discussed above, you will be well-equipped to navigate this domain with confidence. Remember to always prioritize security and privacy when working with OAuth and domain name lookup.


  1. DomainTools Whois Lookup API: https://www.domaintools.com/resources/api-documentation/whois-lookup/
  2. OAuth 2.0 Simplified: Verifying the User Info: https://www.oauth.com/oauth2-servers/signing-in-with-google/verifying-the-user-info/
  3. Modern Guide to OAuth: https://fusionauth.io/articles/oauth/modern-guide-to-oauth
  4. Google Workspace Marketplace: Configure OAuth: https://developers.google.com/workspace/marketplace/configure-oauth-consent-screen
  5. ICANN Auth-Code and WHOIS Search: https://www.icann.org/resources/pages/auth-2013-05-03-en

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