The New Zealand telephone numbering plan describes the allocation of telephone numbers in New Zealand and the Pitcairn Islands.
History New Zealand's first telephone exchanges, established from 1881, were manually operated, with calls connected by operators. Automatic switching began to be introduced from 1913, and expanded gradually over the following decades, although manual exchanges remained in use in some areas until 1990. On manual exchanges, telephone numbers were assigned consecutively in ascending order. Multi-party lines were identified by a suffix letter corresponding to the subscriber's ring pattern in Morse code. For example, subscriber 193M was signalled by two long rings, while 193S was signalled by three short rings. With the introduction of automatic exchanges, the length of local telephone numbers varied between three and seven digits long depending on the size of the exchange and its calling area. Early numbers were limited to five digits long. However, as demand for telephones grew, six-digit numbers began to be introduced in Auckland from 1954, Wellington from 1963, and Christchurch from 1964. Seven-digit numbers began to be introduced in Auckland and Wellington during the 1980s. It was common for telephone numbers of different lengths to coexist within the same area. For example, Hastings in early 1990 had a mixture of five-digit numbers (starting with 6 and 8) and six-digit numbers (starting with 75, 77 and 79). A distinctive feature of New Zealand's telephone system was that rotary telephone dials were numbered in reverse compared with most other countries, with 9 closest to the finger stop and numbers descending anticlockwise to 0. Under pulse dialling, this meant that 9 generated one pulse, 8 generated two pulses, and so on, with 0 generating ten pulses. These characteristics influenced numbering conventions on automatic exchanges. Numbers beginning with 9 were generally not assigned due to the risk of misdialling under pulse dialling. The digit 0 was reserved for the operator, while numbers beginning with 1 were used for special services. When the emergency number 111 was introduced in 1958, it was chosen because its pulse pattern corresponded to the British emergency number 999, allowing compatibility with British-built switching equipment. Before the introduction of subscriber toll dialling (STD), numbering schemes were localised and not fully integrated. Telephone directories included detailed instructions for dialling between neighbouring exchanges, including the use of prefixes for short-distance toll calls. For example, subscribers on the Halswell exchange dialling Christchurch would dial 1 followed by the local number, while Christchurch subscribers dialling Halswell would dial 22 followed by the local number. Local calls within an exchange or local calling area were free (a practice that continues for residential customers), while long-distance (toll) calls required operator assistance.
Subscriber toll dialling Subscriber toll dialling (STD) was introduced in New Zealand in the mid-to-late 1970s, allowing subscribers to dial long-distance calls without operator assistance. The first exchange to implement STD was Upper Hutt on 9 April 1976. On STD-enabled exchanges, callers dialled 0 followed by the area (STD) code and the local number. Access to the operator moved to 010. Calls to manual exchanges continued to require operator assistance. STD codes were initially assigned to local calling areas and varied in length from one to five digits (excluding the leading 0). Shorter codes were allocated to the largest centres — for example, 09 for Auckland, 04 for Wellington, and 03 for Christchurch — while smaller towns had longer codes. The numbering plan was structured hierarchically, with smaller exchanges often assigned additional digits within the code of a larger parent area. This often reflected pre-existing local dialling relationships; for example, the Halswell exchange was incorporated into the 03 area code as 03 22, preserving its earlier access code from Christchurch. The combined length of the STD code and local number typically totalled seven digits, but could range from six to eight digits depending on the area. The rollout of STD continued through the late 1970s and 1980s. In some rural areas, toll calls required brief operator intervention for billing purposes, particularly where party lines were still in use. A complete list of STD codes from 1987 is below:
Reorganisation Between 1989 and 1993, the New Zealand Phone Number Update standardised New Zealand's telephone numbering plan. The number of STD codes was reduced from about 80 to just five (03, 04, 06, 07, and 09), and local numbers were standardised to seven digits. In many areas, seven-digit local numbers were created by prefixing additional digits to the existing shorter numbers; for example, Hastings (070) 77x-xxx and 8x-xxx became (06) 877-xxxx and 878-xxxx respectively. In Auckland, a new second digit was generally inserted instead; for example, Birkdale (09) 43x-xxx became (09) 483-xxxx. Seven-digit local numbers already in use in parts of Auckland and Wellington were largely retained. The changeovers were typically coordinated with the annual publication of telephone directories. In some areas, people dialling the old number after the cutover would hear a recorded message informing them of the change; in others, dialling the old number would result in a number unobtainable tone. Since 1993, landline telephone numbers in New Zealand have followed a structure consisting of a single-digit area code and a seven-digit local number. The first three digits of the local number generally identify the exchange, while the remaining digits identify the subscriber line. The table below lists known conversion dates by area:
Numbering plan New Zealand implements an open numbering plan. The long distance dialing prefix is 0. In the international network its telephone country code is 64. The international dialing prefix is 00.
Landlines
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