Add or edit custom DNS records in Office 365

If Office 365 operated by 21Vianet manages your DNS records, you can add custom DNS records for your domain right in Office 365. You can do this any time after you add your domain to Office 365 and switch your nameserver (NS) records to point to Office 365. You might want to add a DNS record, for example, to redirect Internet traffic for one of your domains to a website that you host with another provider.

Here’s how:

  1. Sign in to Office 365 with your work or school account.

  2. Choose Setup > Domains.

  3. On the Manage domains page, select a domain, and then choose Manage DNS.

  4. Under DNS records, choose New.

  5. Choose the type of DNS record that you want to add, and then, on the Add a DNS record page, type the information for the new record.

  6. Choose Save.

You can edit your custom DNS records later if you need to make changes.

Can’t update the A record or the CNAME record?

If you use a SharePoint Online Public Website, and if you’ve changed your Office 365 public website URL to use your custom domain name, Office 365 may have set your domain’s A record and CNAME record for you. When that happens, you can’t edit the A record or the CNAME record yourself.

To free it up so you can change these records, you must change the URL for your public website back to the default URL.

Here's how to do that if you have Office 365 for Small Business. (If you have a different Office 365 plan, learn about setting up and changing your public website URL.)

  1. Sign in to Office 365 with your work or school account.

  2. In Office 365, select Admin. Or, select the app launcher Office 365 app launcher icon , and then select Admin.

  3. Choose Manage your public website.

  4. Choose Change address next to your public website. (If you have two public websites, it just means that you were upgraded from an earlier version of Office 365. Choose the one with the URL that is set to your custom domain.)

  5. In the drop-down list, select the original, domain name, and then select Save.

Wait a little bit for the change to take effect. Now go back to the steps above, and you should be able to edit the A record and the CNAME record.

Need to do something else with your domain's DNS?

See if one of the following helps:

  • Need to update your MX record? First, make sure that you manage the DNS for your domain, not Office 365. (Not sure what that means? Learn more about DNS management in Office 365.) Then find your domain registrar in the list provided in Create DNS records for Office 365 when you manage your DNS records, and select the registrar name to go to the step-by-step help for creating MX records, and other DNS records, for Office 365 services.

  • Have additional SPF records you want to add for your domain? If Office 365 manages DNS for your domain, Office 365 handles spam filtering for you. You can't add another TXT record for SPF (spam filtering). To do that, you must set up your domain so that you manage the domain's DNS yourself at your domain registrar. When you manage DNS for your domain at your domain registrar, you set up the SPF DNS record for the domain at the registrar.

  • Want to switch so Office 365 manages DNS for your domain? Or the other way around: switch to managing DNS for your domain yourself, at your domain registrar? To make this change, you must remove your domain from Office 365, and then add the domain again. Follow these steps to make the change.

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