http://hhonors.hilton.com/en/hhonors...emberGuide.pdf

Eligible Rate stays: No point or stay credit, airline frequent flyer mileage credit or credit toward tier status will be awarded for wholesale/tour operator packages, contracted airline crew rates, travel industry rates (including but not limited to travel agent discount rates), complimentary or barter rooms, stays on NET Group, Series Group or IT Group rates, contracted Entertainment or Encore rates and stays using airline percent-off award certificates. Stays that are booked via third party websites other than the websites of Hilton HHonors airline partners are not Eligible Stays irrespective of rate paid, for the purpose of earning points, miles or stay credit toward VIP tier status. Stays booked via “opaque” channels where the brand is unknown at the time of purchase are not Eligible Stays for the purpose of earning points, miles or stay credit toward VIP tier status, or the receipt of VIP tier benefits such as upgraded accommodations/amenities or access to health clubs. No point or stay credit, airline frequent flyer mileage credit or credit toward tier status will be awarded for “no show” situations when a member has made a reservation guaranteed with a credit card but then does not check in to the hotel — irrespective of whether or not the member’s credit card is charged for any portion of the reserved stay per the hotel’s “no show” policy.