Azure Subscription ID, tenant ID or domain to Microsoft Entra tenant lookup
- Subscription ID
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- Tenant ID
- –
- Display name
- –
- Default domain
- –
sub2tenant maps any Azure Subscription ID, tenant ID or verified domain to its Microsoft Entra tenant.
Azure Subscription to tenant lookup
sub2tenant lets you find which Microsoft Entra tenant an Azure subscription belongs to. It supports
lookups using an Azure Subscription ID (also called a subscription GUID or subscription identifier),
allowing administrators to determine the owning tenant when only the subscription ID is known from
logs, alerts, invoices or automation systems. The service performs an unauthenticated Azure Resource
Manager request to read the tenant value from the WWW-Authenticate header and resolves
tenant details using Microsoft Graph's tenantRelationships API.
This page also covers the Azure subscription ID tenant lookup tool scenario, where the goal is to quickly determine the tenant behind a subscription GUID without portal access or elevated roles.
Tenant ID and domain lookups
The tool also returns tenant information when a Microsoft Entra tenant ID is supplied, providing the
tenantId, displayName and defaultDomainName. Domain lookups are
supported for verified Microsoft 365 and Entra domains, enabling quick identification of which tenant
owns a given domain.
Email address handling
Email addresses are accepted for convenience: sub2tenant extracts the apex domain from the email address and performs the same domain-to-tenant lookup. This is useful when only an email is available during troubleshooting or incident response and you still need to identify the underlying tenant.
Related subscription and tenant queries
Typical use cases include: find tenant from subscription ID, map subscription ID to tenant, lookup tenant by subscription GUID, determine which tenant owns a given subscription, identify the tenant from a domain, perform a tenant ID lookup, and handle subscription tenant mapping for MSPs and cloud operations teams.
sub2tenant is a lightweight Azure tenant lookup utility for subscription-to-tenant mapping, tenant discovery and quick Microsoft Entra troubleshooting.
Categories: Azure tool, Microsoft Entra lookup, subscription tenant mapping.