Find an Azure Active Directory Tenant ID and/or Custom Domains using a registered Domain Name

Description

Signed PowerShell module to

• lookup a domain name and return the associated Entra ID (Azure Active Directory) Tenant ID
• query ExchangeOnline for Registered Domains

Features

• Queries the 'Well-Known' Entra ID (Azure AD) Open ID Connect (OIDC) Authorization Endpoint using a domain name and returns the TenantId
• Queries the Exchange Online Autodiscovery service using a domain name and returns all other registered domains.
• Aliases for new Entra ID naming Get-AzureADTenantId == Get-EntraIDTenantId AND Get-AzureADCustomDomains == Get-EntraIDCustomDomains
• Works with Windows PowerShell and PowerShell (6.x+)

Installation

Install from the PowerShell Gallery on Windows PowerShell 5.1+ or PowerShell Core 6.x or PowerShell.

Install-Module -name AzureADTenantID

How to use

Entra ID (AAD) Tenant ID

Get-AzureADTenantId -domain 'microsoft.com'
or
Get-EntraIDTenantId -domain 'microsoft.com'

or

'microsoft.com' | Get-AzureADTenantId
or
'microsoft.com' | Get-EntraIDTenantId

Exchange Online Domains (which usually infers EntraID (AAD) custom domains so that email and UPN matches for users.)

Defaults to WW Cloud

Get-AzureADCustomDomains -domain 'microsoft.com'
or
Get-EntraIDCustomDomains -domain 'microsoft.com'

For GCC-H use the -GCCH switch

Get-AzureADCustomDomains -domain 'microsoft.com' -GCCH
or
Get-EntraIDCustomDomains -domain 'microsoft.com' -GCCH

or

'microsoft.com' | Get-AzureADCustomDomains  
or
'microsoft.com' | Get-EntraIDCustomDomains  

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