A detailed page on HF band usage is available on this page which was curated by Mark, ZL3AB and Gary, ZL2IFB.
New Zealand Bandplans Notes
These bandplans are to ensure that your transmissions do not impose problems on other operators and that their transmissions do not impact on you. It is to the advantage of all operators that the published bandplans be respected.
The Ministry of Economic Development (MED) defines the band limits, while the internal band segments are derived from the IARU Region 3 bandplans with New Zealand adaptations. See: http://www.iaru-r3.org/r3bandplan.doc
The band frequency limits are found in the Radiocommunications Regulations (General User Radio Licence for Amateur Radio Operators) and on the NZART Web site below, under the heading, Additional Note Regarding Other Bands.
The IARU Region 3 bandplans, developed to meet international requirements, are at the IARU Region 3 web site. See: http://www.iaru-r3.org/r3bandplan.doc-(MS Word file) 151 kB
Additional Note Regarding Other Bands
The band 50 to 54 MHz is shown in the International Radio Regulations as AMATEUR but in New Zealand, only 51 to 53 MHz is available. Because the band 50 - 51 MHz is used by commercial television in New Zealand, a special permit is required and may be available from MED RSM for amateur stations wishing to operate there. Special conditions apply. (Permits can usually only be considered for amateur stations located outside the coverage areas of 44 to 51 MHz television stations.)
Two spot frequencies near 5 MHz are available for use by the Amateur Radio Emergency Communications (AREC). Special conditions apply. See: council/policies/2009-access-to-5-mhz/
Access to the band 614 to 622 MHz for Amateur Television (ATV) repeater use and for other purposes has special conditions which are administered by ELG. See: council/policies/2006-access-614-mhz-band/