When an app is created a subdomain is set for the app. 

• URL: https://(account name)-(app subdomain)-(environment name).app.oneblink.io
• Account Name: The name assigned to your organization's account (name or acronym of the organization)
• App Subdomain: This can be anything, usually the name or shortened version of the app name (myapp)
• Environment Name: The name of the environment the app is in (test, dev, etc.)
  • Note: The environment name will not be included for apps in the production environment. View more information on Environments.
    
    

You can also set custom domains for their apps, removing the need to include any references to the Account, Environment, or CivicPlus. 

Resources 

• Add a Custom Domain
• Remove a Custom Domain