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# Active domains in Acquia Cloud¶

In Acquia Cloud, the first bare domain name you add to an environment is the active domain for that environment. This is true with, or without the www prefix. Environments containing no bare custom domains use the Acquia default domain as the active domain.

Note

The active domain for an environment cannot be changed. For more information, see this known issue.

Acquia Cloud uses the active domain for several purposes, including: