Update DNS records to keep your website with your current hosting provider
If you manage your domain's Office 365 records at your DNS hosting provider, you don't have to worry about the steps in this topic. Your website stays where it is and people can still get to it.
If Office 365 manages your DNS records, to route traffic to an existing public website hosted outside of Office 365, after you add your domain to Office 365, do the following:
Update DNS records in the Microsoft 365 admin center
In the admin center, go to the Settings > Domains page.
On the Domains page, in the list of domains, select the domain you're using for your website, and then select DNS settings in the management pane.
Select + New custom record and enter the following:
For DNS type enter: A (Address)
For Host name or Alias, type the following: @
For IP Address, type the static IP address for your website where it's currently hosted (for example, 172.16.140.1).
This must be a static IP address for the website, not a dynamic IP address. Check with site where your website is hosted to make sure you can get a static IP address for your public website.
- Select Save.
In addition, you can create a CNAME record to help customers find your website.
- Select + New custom record and enter the following:
For DNS type enter: CNAME (Alias)
For Host name or Alias, type the following: www
For Points to address, type the fully qualified domain name (FQDN) for your website (for example, contoso.com).
- Select Save.
Finally, do the following:
Update your domain's NS records to point to Office 365.
When the NS records have been updated to point to Office 365, your domain is all set up. Email will be routed to Office 365, and traffic to your website address will continue to go to your current website host.