# Add a domain to the Active Directory

[https://lazyadmin.nl/it/add-a-domain-to-the-active-directory/](https://lazyadmin.nl/it/add-a-domain-to-the-active-directory/)

## How to add a domain to the Active Directory

<div class="schema-how-to wp-block-yoast-how-to-block" id="bkmrk-login-to-your-domain">1. **Login to your domain controller**
2. **Open the “Active Directory Domains and Trusts”**
3. **Open the Properties of Active Directory Domains and Trusts**Right-click on the top item in the left tree view and select properties
    
    [![Add-Domain-to-Active-Directory.jpg](https://docs.coltscomputer.services/uploads/images/gallery/2024-01/scaled-1680-/5xAcjoyA42GBD6ob-add-domain-to-active-directory.jpg)](https://docs.coltscomputer.services/uploads/images/gallery/2024-01/5xAcjoyA42GBD6ob-add-domain-to-active-directory.jpg)
4. **Add the new Domain Name**In the UPN Suffixes dialog, enter the new domain name in the “**Alternative UPN Suffixes**” field and click on **Add**
    
    [![Add-domain-to-ad.jpg](https://docs.coltscomputer.services/uploads/images/gallery/2024-01/scaled-1680-/0Kty5DEC5w7vFGIs-add-domain-to-ad.jpg)](https://docs.coltscomputer.services/uploads/images/gallery/2024-01/0Kty5DEC5w7vFGIs-add-domain-to-ad.jpg)
5. **Apply the settings**Click Apply and close the windows. The domain is now added to the domain controller.
6. **(optional) for replication to other domain controllers**If you have multiple domain controllers you can force the replication with the following command in PowerShell / CMD: `repadmin /syncall /AdeP`

</div>You should now be able to use the new domain name in the Active Directory or in the Exchange Administration Center.