Cloudekidentity
On-Prem AD vs Hybrid vs Azure AD Join: Key Differences
Compare on-premises AD domain join, Microsoft Entra join and hybrid join. Learn how registration differs, what each model needs, and how to choose.
On-prem AD vs hybrid vs Azure AD join: what changes?
Reviewed: 4 November 2026. “Azure AD join” remains a familiar search phrase. Microsoft renamed Azure Active Directory to Microsoft Entra ID in 2023, so current documentation and product labels use Microsoft Entra. This comparison keeps the older term in the title for people searching for it, then uses current names below.
The short answer: these are different device identity relationships, not three names for the same cloud migration. Domain join connects a Windows device to Windows Server Active Directory Domain Services (AD DS). Microsoft Entra join connects an organization-owned device to Entra ID without joining it to an on-premises AD domain. Microsoft Entra hybrid join connects the device to on-premises AD DS and registers it with Entra ID. A separate state, Microsoft Entra registration, gives a device an identity in Entra without joining it to either directory.
The phrase Active Directory domain join describes the traditional AD DS relationship; it does not describe Microsoft Entra registration or Microsoft Entra join alone.
At a glance
| Device state | Directory relationship | What to plan for |
|---|---|---|
| AD DS domain joined | Joined to an on-premises AD DS domain | Domain controllers, domain policy, applications and network paths that rely on AD DS |
| Microsoft Entra joined | Joined to Entra ID only | Cloud identity and a separately selected management approach, such as Intune |
| Microsoft Entra hybrid joined | Joined to AD DS and registered with Entra ID | Existing domain dependencies plus Entra registration and the required synchronization/configuration |
| Microsoft Entra registered | Registered with Entra ID; not domain joined | Commonly a personal or BYOD identity scenario; it is not the same as Entra join |
Microsoft distinguishes these device identities in its device identity overview, Entra join guide, and hybrid join guide.
What on-premises AD domain join provides
An AD DS domain-joined computer has a computer account in the on-premises domain. Organizations may rely on that relationship for Group Policy, domain-based authentication, machine accounts, file or application access, and established provisioning workflows. Identify exact dependencies, such as policy refresh, domain authentication or access to a particular server.
What Microsoft Entra join changes
A Microsoft Entra joined device is joined to Entra ID only. Users can use their organizational account to sign in, and Entra joined devices can access supported on-premises resources in appropriate configurations. Access to a particular legacy app or resource still depends on its authentication and network prerequisites.
Join state and management are separate decisions. Microsoft documents mobile device management (MDM), including Microsoft Intune, and co-management with Configuration Manager. Entra join does not recreate every GPO, script, imaging workflow or application dependency; map each requirement to a supported control and test it before moving devices.
What hybrid join retains
A Microsoft Entra hybrid joined device is joined to on-premises Windows Server AD and registered with Entra ID. It can provide Entra device identity while retaining AD DS workflows. Microsoft states that hybrid joined Windows devices need periodic line-of-sight to on-premises domain controllers; plan for that and the domain, DNS and synchronization prerequisites.
Hybrid join keeps on-premises responsibilities in scope. Microsoft describes it as an interim step in some modernization guidance, not a universal deadline for every organization. Choose based on requirements and a tested roadmap.
How to choose
- List dependencies. Identify apps using AD computer authentication, Group Policy, domain resources, scripts, certificates or existing deployment processes. Confirm with application owners; age alone does not prove a dependency.
- Check management. Decide how configuration, compliance, updates, security and support will work. Test the relevant Intune or Configuration Manager policies instead of assuming a one-for-one GPO mapping.
- Test access paths. Test sign-in and required resources from office, remote and disconnected conditions. Record where VPN, domain-controller reachability or application changes are needed.
- Pilot. Compare provisioning options, test representative devices and document issues, owners, rollback criteria and evidence needed before expanding.
Microsoft recommends cloud-native Microsoft Entra join for new Windows Autopilot deployments. Some Autopilot scenarios support hybrid join for environments that need them. See Windows Autopilot requirements.
Azure AD vs on-prem AD, and AAD vs ADDS: which "AD" is which?
Many searches for "Azure AD vs on-prem AD", "on prem AD vs Azure AD", "local AD vs Azure AD" or "AAD vs ADDS" are really asking what the difference between Azure AD and Active Directory is. Three different things share the letters AD:
- On-premises Active Directory (AD DS) is the Windows Server directory behind domain join, Kerberos, LDAP and Group Policy. It runs on domain controllers that you operate.
- Microsoft Entra ID, formerly Azure AD or AAD, is the cloud identity service behind Microsoft 365. It uses modern protocols such as OAuth, OpenID Connect and SAML. It is not a domain controller in the cloud, so it does not replace AD DS for workloads that need domain protocols. Read can Microsoft Entra ID replace Active Directory for the details.
- Microsoft Entra Domain Services, formerly Azure AD DS or AAD DS, is a managed domain in Azure with domain join, LDAP, Kerberos and NTLM. "Azure AD DS vs on-premises AD" is a comparison of a managed domain with a domain you run yourself; the Azure AD DS vs self-managed AD DS comparison and what Azure AD DS is cover it.
"Hybrid Active Directory" means keeping on-premises AD DS and synchronising it to Microsoft Entra ID with Microsoft Entra Connect, so one user has one identity in both places. Hybrid join, described above, is the device-side counterpart. If you plan one, the hybrid join prerequisites and the hybrid join troubleshooting guide help, and rolling over the seamless SSO Kerberos key is routine maintenance once seamless SSO is in use. Mail-flow setups that sit beside a hybrid design are covered in enhanced filtering for connectors in Exchange Online.
| Question | On-premises AD DS | Microsoft Entra ID (Azure AD) | Entra Domain Services (Azure AD DS) |
|---|---|---|---|
| Who runs it | You | Microsoft | Microsoft |
| Sign-in protocols | Kerberos, NTLM, LDAP | OAuth, OpenID Connect, SAML | Kerberos, NTLM, LDAP |
| Group Policy | Yes | No; devices use MDM such as Intune | Yes, inside the managed domain |
| Typical objects | Users, groups, computers, OUs | Users, groups, devices, apps | Synced users and groups, domain-joined servers |
| Best for | Domain-bound servers and apps | Microsoft 365 and cloud apps | Legacy apps lifted into Azure |
Keep the decision specific
Entra join may fit a cloud-first device with no blocking AD DS dependency and a validated management plan. Hybrid join may fit while a required workflow depends on domain membership; registration may suit personal-device access. These are starting points, not universal recommendations.
The on-premises AD to Entra hybrid pre-migration checklist covers directory and synchronization planning. Pilot before changing join state broadly.
Sources reviewed 4 November 2026: Microsoft Entra device identity overview; What is a Microsoft Entra joined device?; What is a Microsoft Entra hybrid joined device?; Plan your Microsoft Entra hybrid join deployment; Windows Autopilot requirements.