Hi,
Yes, it is the purpose of multiple domains, but since Kentico
CMS is licensed per domain, you need separate license key for each domain name/IP under which you are accessing the site. Moreover, for development, testing, staging purpose you can get the license keys for free as well as for any number of domain aliases which are pointing to the same web site content. For additional license keys you need to contact our support (support@kentico.com) or sales (sales@kentico.com).
Best regards,
Juraj Ondrus