.PT is the country code domain for Portugal.
Associação DNS.PT is the entity responsible for the management, registration and maintenance of the .pt ccTLD. The .pt ccTLD was technically and administratively assigned to the FCCN (Foundation for National Scientific Computing) at the end of the 1980s.
For a domain to be assigned in the .pt zone it must be technically associated to a primary name server that is correctly installed and configured, in order to ensure an authoritative response to the domain being registered.