List of dialling codes in New Zealand
K Country code: 64 International call prefix: 00 Trunk prefix: 0 New Zealand's telephone numbering plan divides the country into a large number of local calling areas. Calling a destination in another local calling area, requires the dialing of the trunk prefix followed by the area code and the local telephone number.
Source: Wikipedia — List of dialling codes in New Zealand (CC BY-SA 4.0)