Entrynorway.no - all persons must register prior to crossing the border, pr. 08.01-21

In order to improve infection control, all persons travelling to Norway must register prior to crossing the border. This also applies to Norwegian citizens. The purpose of registration is to ensure compliance with the duty to quarantine, to strengthen infection control and to contribute to improved contact tracing – and thereby limit import infection.
Travellers must register prior to their arrival in Norway and may only register their journey within 72 hours of their time of arrival.