The quadrennial Dutch hacker convention is a hacker convention. It reoccurs every four years at different cities around the Netherlands. It was first held in 1989. In the past, it was organized by Hack-Tic magazine, and currently it is organized by the IFCAT Foundation.
On years where it is not held, two other similar events are held instead: Chaos Communication Camp in Germany (every 4 years), and Electromagnetic Field in the UK (every 2 years).