How to get the streetname and city when user fills in zip code

I just took a look at www.wehkamp.nl (dutch only). When you try to make an account you can fill in your zip code (postcode) and it will automatically give you your city and street name. I knew this would be possible because most streets have it's own zip code. I have found some examples of automatically filling in country and city name when a user fills in his zip code. But none of street name + city name.

This is what Wehkamp returns when I fill in a zip code.

The bottom text is even telling the user that housenumber 139 does not exist on the filled in zip code.

Does anyone know if there is a special technique for this?