Denmark has a large network of popular hostels in great locations. To stay at a Danish hostel (known as Danhostels) you will need to hostel card.
As a foreign visitor, you can use hostel cards from your own country, an international hostel card or you can pay a guest fee. You can buy Danhostel discount cards and international hostel cards at all Danhostels. A Danhostel discount cards costs 70kr, a guest card 35kr and an international hostel card 160kr (2012 figures).