Google Adsense has a service for the big client.
The official description shown below:
Maximize revenue on parked pages
AdSense for domains allows domain name registrars and large domain name holders to unlock the value in their parked page inventory. AdSense for domains delivers targeted, conceptually related keywords and advertisements to parked domain name pages by using Google’s semantic technology to “understand” the meaning of each domain name. Powering over 3 million domain names, AdSense for domains is the industry’s leading parked page service.
AdSense for domains is fully scalable and is designed for easy integration – so your network of sites can start earning revenue through AdSense for domains quickly and easily.
Who can apply for this service?
If your sites generate more than 750,000 page views per month, it is right for you.
Click here to go to Google’s official site.