Chapter 5. Domains

5.1. Introduction to Domains

An OpenShift Online domain forms part of an application's URL and is unique to an account. The syntax for an application URL is application-domain.example.com. Each user name supports a single domain, but you can create multiple applications within the domain. Note that a domain must be created before you can create an application.
An OpenShift Online blacklist restricts the domain names that are available. A warning message informs you if a blacklisted domain name has been selected when you attempt to create a domain.
Domain names consist of a maximum of 16 alphanumeric characters and cannot contain spaces or symbols.