The NAD frequently gets requests to provide detailed dialling plans so that users can have a reference on the precise nature of how telephone numbers are used in New Zealand.  Commonly, these requests come from companies installing PBX machines that want to know things like number lengths and formatting so as to properly configure the machine.

Unfortunately, the NAD is not in a position to provide this level of accuracy in relation to the New Zealand dialling plan.

By design, the NAD maintains a high level overview and allows for a considerable amount of flexibility within the New Zealand Dialling Plan.  This is specifically so that carriers can offer the services they want to.  The NAD allocated numbers in blocks, how those numbers are ultimately activated and configured, especially in those Service Categories which allow for maximum flexibility (such as the Non-Geographic (mobile) Service Category) is up the NAD member themselves.  Historically, numbering was even more flexible than permitted under the NAD’s rules, and those allocations are still in effect.  The NAD will never be able to capture every nuance in the numbering plans implemented by NAD members. 

If you need to know about number lengths, formatting and other restrictions, these three documents will provide you with 99% of the information you need:

  • The NAD Rules contain all the high level details on number lengths, including minimum and maximum options for each Service Category, but not each specific number range within those Service Categories.
  • The New Zealand Numbering Plan contains details on maximum and minimum number lengths for each specific range that is diallable from overseas.  This does not include those numbers diallable only from within New Zealand.
  • The NAD Register contains details on what NAD member has been allocated which Code Blocks, the assigned LICAS for each Geographic range, and other useful information. 

When read in conjunction, these three documents provide enough data for most number ranges to determine who has what numbers, their lengths, and how they can be used. 

Not enough?

If you wish to know the details of all domestically diallable number ranges, their number lengths and the services that use them (including charging), your only option is to contact your service provider (or your customer's service provider as the case may be).  The service provider, particularly their wholesale division, ought to be able to provide you with the relevant dialling plan that they use.  Note, this information may vary from provider to provider, so it is important that you contact the service provider providing services to the equipment that you are installing and don't rely on generic data from one provider.  You should also note that in some cases these plans are very long, up to 10,000 lines, so for most people the three documents noted above will suffice.

For a list of current NAD members, all of whom will have their own dialling plans, please see our member page here.