The license stipulates that your page view amount applies to one domain name. However, that domain can have multiple top-level domains and subdomains, as long as there is only one second-level or main domain (see examples below). Regardless of variation in domain names, all content must be owned and controlled by you.
Examples of multiple top-level domains:
example.com, example.net, example.org, example.fr, example.dk
Examples of multiple subdomains:
shop.example.com, blog.example.com, fr.example.com,
Example of one unique second-level domain:
www.example.com, shop.example.com, shop.example.net, blog.example.dk, france.example.com, www.example.org