The Naukowa i Akademicka Sieć Komputerowa (English: Research and Academic Computer Network), abbreviated NASK, is a Polish research and development organisation, data networks operator, and internet domain name registry operator for the .pl country-level top-level domain.

NASK includes a computer emergency response team called CERT Polska.

Active since 1996, it handles security incidents and conducts internet security-related research and development.

It responds to anonymous reports received from Internet users about potentially illegal material, such as child abuse content.

Dyżurnet.pl also carries out awareness raising and educational activities to increase the level of the online safety of children and young people by, among others, taking various initiatives, including campaigns, conferences, trainings for professionals and experts as well as workshops for the youngest Internet users.