SIDN is responsible for the stability and development of the .nl domain. Over 5 million .nl domain names have been registered, and the organisation processes over 1 billion queries per day.

SIDN has a solid position in the arena of politics and administration as an expert partner for the technical, legal and administrative sides of domain names and domain-name infrastructure. As such, it is also closely involved in several broad societal initiatives, especially regarding improved security, reliability, openness and accessibility of the internet.

SIDN supports both local and international initiatives in which government, business and science cooperate to achieve innovation.