1. Google has setup nameservers to use if you would like to point your parked domains to Google Adsense for Domains.

      ns1.googleghs.com
      ns2.googleghs.com
      ns3.googleghs.com
      ns4.googleghs.com

      However, you can only use one Google product per domain

      https://www.google.com/adsense/support/as/bin/answer.py?sourceid=aso&subid=ww-ww-et-asui&medium=link&answer=154197