% APNIC found the following authoritative answer from: whois.apnic.net

% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to '121.75.0.0 - 121.75.255.255'

% Abuse contact for '121.75.0.0 - 121.75.255.255' is 'abuse@one.nz'

inetnum:        121.75.0.0 - 121.75.255.255
netname:        ONENZ-AP
descr:          Level 6, Tower B, 30 Daldy Street
descr:          Auckland 1010
country:        NZ
admin-c:        NO26-AP
tech-c:         NO26-AP
abuse-c:        AO464-AP
status:         ALLOCATED NON-PORTABLE
remarks:        -+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+
remarks:        This object can only be updated by Vodafone NZ hostmasters.
remarks:        hostmasters and include your organisation's account
remarks:        To update this object, please contact APNIC
remarks:        name in the subject line.
remarks:        -+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+
mnt-by:         MAINT-ONENZ-NZ
mnt-irt:        IRT-ONENZ-NZ
last-modified:  2025-11-11T23:01:11Z
source:         APNIC

irt:            IRT-ONENZ-NZ
address:        Level 6, Tower B, 30 Daldy Street
address:        Auckalnd Central
address:        Auckland 1010 New Zealand
e-mail:         PlanningandDesign.Networks@one.nz
abuse-mailbox:  abuse@one.nz
admin-c:        ONZG1-AP
tech-c:         ONZG1-AP
auth:           # Filtered
remarks:        planninganddesign.networks@one.nz was validated on 2025-08-08
remarks:        abuse@one.nz was validated on 2025-08-08
mnt-by:         MAINT-ONENZ-NZ
last-modified:  2025-12-19T01:07:13Z
source:         APNIC

role:           ABUSE ONENZNZ
country:        ZZ
address:        Level 6, Tower B, 30 Daldy Street
address:        Auckalnd Central
address:        Auckland 1010 New Zealand
phone:          +000000000
e-mail:         PlanningandDesign.Networks@one.nz
admin-c:        ONZG1-AP
tech-c:         ONZG1-AP
nic-hdl:        AO464-AP
remarks:        Generated from irt object IRT-ONENZ-NZ
remarks:        planninganddesign.networks@one.nz was validated on 2025-08-08
remarks:        abuse@one.nz was validated on 2025-08-08
abuse-mailbox:  abuse@one.nz
mnt-by:         APNIC-ABUSE
last-modified:  2025-11-11T00:30:59Z
source:         APNIC

person:         Network Operations
nic-hdl:        NO26-AP
e-mail:         noc@one.nz
address:        Level 6, Tower B, 30 Daldy Street
address:        Auckland Central
address:        Auckland 1010
address:        New Zealand
phone:          +64-9-355-2000
fax-no:         +64-9-355-2001
country:        NZ
mnt-by:         MAINT-ONENZ-NZ
last-modified:  2025-11-11T22:54:28Z
source:         APNIC

% Information related to '121.75.0.0/16AS9500'

route:          121.75.0.0/16
origin:         AS9500
descr:          One NZ Private Bag 92161 Victoria Street West Auckland 1142 New Zealand
mnt-by:         MAINT-ONENZ-NZ
last-modified:  2024-07-01T02:30:11Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.34 (WHOIS-AU4)