User in REX – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Library > Lending > User in REX

In collaboration with the Royal Library of Copenhagen and the University of Copenhagen we offer students and employees connected with NBI access to a large number of online journals, books, and databases. In order to get access to this, you need to be a registered user in REX, and on this page we will guide you through registration - Go to REX here >>

You need a Danish CPR number (Civil Personal Registration) as well as a Copenhagen University ID in order to get access to the electronical services. Registered guests will have received pseudo-CPR identification from the university which they will need instead of the ordinary CPR, when they register.

Go to this link and find "New user" or, if the page insists on showing in Danish, "Ny låner" - REX >>

The site has a habit of switching between Danish and English in spite of choosing the language. When you need to see the page in English, you can change this in the upper right corner as shown below:

After changing, you will get the following options:

"Employee" is for VIP, PhD, and long term guests (more than 3 months).

"Student" is for Bachelor, Master, and Erasmus students.

"Other type of user" will not provide remote access to materials subject to licenses. You can access these materials when connected to eduroam, though.

Employees will be asked to provide an address for their institute, where loans can be delivered. By choosing "employee" you will be directed to this page, where you should choose "yes":

Then, you will need to fill out this form:

By sending in this form, you are now registered in REX and can log in.

Students will be asked to provide their CPR number, if they have one.

If, for any reason, you do not have a Danish CPR number, you will have received a 10-digit pseudo CPR number by the university, which can be retrieved through KUnet > Self Service > My data > UCPH username. Look for the 10-digit number under "Provisional personal identification". Send your pseudo-CPR to

Next, type in your CPR or pseudo CPR and continue to the registration form.