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The .ac top-level domain is the Internet country code (ccTLD) for Saint Helena, Ascension and Tristan da Cunha, used primarily for Ascension Island (Saint Helena has its own ccTLD, .sh). It is administered by NIC.AC, a subsidiary of the Internet Computer Bureau based in the United Kingdom. Registration for the domain is open to anyone. [1]


Although its intended use is for entities connected with Ascension Island, this ccTLD is largerly used for educational institutions and programs, like the Dhaka Internation University in India (diu.ac) and the Ralston College in the US (ralston.ac), due to its similarity to the .ac ("academic") second-level domain that exists under some country code top-level domains. It's their registrar NIC.AC main marketing.[1]

In 2013, after its .sx domain was seized, The Pirate Bay temporarily relocated its site to thepiratebay.ac.[2]

.ac is also being used by anti-cheat software Easy Anti-Cheat. [3]