M365 Tenant ID Lookup

Retrieve the backend Azure AD / Microsoft Entra ID Tenant ID for any domain. Required for API integrations, migrations, and support requests.

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What is a Microsoft 365 Tenant ID?

A Tenant ID (also known as an Azure AD Directory ID) is a globally unique identifier (GUID) used by Microsoft to identify your specific instance of Azure Active Directory (now Microsoft Entra ID). It looks like this: 8z6b1424-9b25-4x77-8y42-990a9ab592t1.

Why do you need it?

You'll typically need your Tenant ID when:

Configuring SSO / SAML applications
Setting up APIs that connect to Microsoft Graph
Providing delegated admin access to an MSP (like TECHOM Systems)
Running PowerShell scripts against your environment
Opening complex support tickets with Microsoft

How does this tool work?

This tool pings Microsoft's public OpenID endpoints (https://login.microsoftonline.com/{domain}/.well-known/openid-configuration) which structurally returns the underlying Tenant ID in the authorization endpoints, without requiring any authentication.