After your arrival in the Netherlands you have to make an appointment with the municipality of Nijmegen or the city you will live in during your stay in the Netherlands. The length of your stay determines the way you will be registered by the municipality.
I will stay up to four months
If your stay in the Netherlands is no longer than four months, you can register with the Registration of Non-Residents (RNI). You are required to make an appointment with the Municipality of Nijmegen for your RNI. Once you have registered, you will receive a Citizen Service Number (BSN). This is a personal number that government agencies and other official bodies use in their communications with citizens. You will receive a letter of confirmation, which also states your Citizen Service Number. We strongly recommend to keep this letter with your BSN in a safe place.