You can change the name servers for an existing domain to the Rackspace name servers by following these steps:
Use the Rackspace Cloud Control Panel to create corresponding DNS records for your domain.
Log into your domain registrar's account and locate the section that specifies the name servers.
The following name servers will work as well:
Changing the name servers initiates the transfer of the domain to the Rackspace name servers.
Note: For most domains the propagation takes 48 hours.
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