A domain and a subdomain would require a license, as they are technically often are separate domains and can place cookies and trackers individually as well. Any number of sub-pages are included into the license of the domain or subdomain.

Let us illustrate the above via example - 

- Domain: example.com (requires license)

- Sub-page: example.com/subpage (does not require license)

- Sub-domain: subdomain.example.com (requires license)

A bit more extensive article on the domain licensing model can be found here.