Microsoft Entra ID

Not to be confused with Active Directory.

Developer	Microsoft
Type	Cloud-based identity management service
Platform(s)	Cross-platform
Status	Active
Website	Official Site

Microsoft's Azure Active Directory (shortened Microsoft Azure AD) is a cloud-based solution for managing identity and access. It is a directory and identity management service that operates in the cloud and offers authentication and authorization services to various Microsoft services like Office 365, Dynamics 365, Azure, and cloud-based applications. Azure AD provides users with a seamless single sign-on experience, regardless of whether their applications are cloud-based or on-premises.

Azure AD offers many authentication methods, including password-based, multi-factor, smart card, and certificate-based authentication. It also includes several security features, such as conditional access policies, risk-based authentication, and identity protection.

Service Limits and Restrictions

Note: Some of the limits and restrictions can be updated by submitting a service request to Azure Support.

Category	Limit
Tenants	A user can belong to max 500 AAD tenants A user can create a max of 200 directories 300 license-base subscriotions
Domains	No more than 5000 managed domain names
Resources (users, devices, identities, applications)	Max of 50,000 Azure AD resources Non-Admin user can create no more than 250 resources
Schema Extensions	Max 256 characters for String-type extensions Max 256 bytes for Binary-type extensions Only 100 extension values across all types and all applications Only User, Group, Tenant Detail, Device, Application and Service Principal entities can be extended
Applications	Max 100 users and service principals can be owners of an application A user, group or service principle can have max of 1,500 app role assignments

See also

• Azure AD Connect
• Active Directory

Further reading

• Zaal, Sjoukje (2022). Azure Active Directory for Secure Application Development: Use modern authentication techniques to secure applications in Azure. Packt Publishing. ISBN 978-1838646509.
• Mayank, Manas; Garg, Mohit (2019). Developing Applications with Azure Active Directory: Principles of Authentication and Authorization for Architects and Developers. Apress. ISBN 978-1484250396.
• Bertocci, Vittorio (2016). Modern Authentication with Azure Active Directory for Web Applications. Microsoft Press. ISBN 978-0735696945.

External links

• Official website