Tier1/G ads are the static ad links which are used in conjunction with our parking pages to generate EPC (Earnings Per Click) revenue.
Tier2 ads use URL redirection to serve ads directly to the visitor. These ads are used to monetize domain names when Tier1/G ads are unavailable, e.g., Tier1/G faillisted, ad blockers, etc. Tier2 ads may also be used if a domain has received exclusive bids from a Tier2 advertiser.