.tt is the internet country code top-level domain (ccTLD) in the Domain Name System of the Internet for Trinidad and Tobago.
The Trinidad and Tobago Network Information Centre (TTNIC) allows registrations under for second-level domains, and for third-level domains under the following domains: , , , , , , , , , , , , , , and . Registration under the above domains is unrestricted and the registry does not require applicants to have a physical presence in Trinidad and Tobago. However, registrants with a foreign address are charged double.
In addition, there is , restricted to entities in the Military of Trinidad and Tobago, is a registry for educational institutions in Trinidad and Tobago, and reserved for agencies of the government.
Domain hacks using include and , URL shorteners used for IFTTT and the 2012 U.S. presidential campaign of Mitt Romney, respectively.