High Quality Content by WIKIPEDIA articles! Domain tasting is the practice of a domain name registrant using the five-day "grace period" (the Add Grace Period or AGP) at the beginning of the registration of an ICANN-regulated second-level domain to test the marketability of the domain. During this period, when a registration must be fully refunded by the domain name registry, a cost-benefit analysis is conducted by the registrant on the viability of deriving income from advertisements being placed on the domain`s website.