Apparatus

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sensors Mode-S transponder

C81B4D

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-HNZ · AGUSTA AW-139

Hex
C81B4D
Octal
62015515
Decimal
13,114,189
Country
NZ
Tail
ZK-HNZ
Type
A139
No current signal · last broadcast 3d ago
Flights observed
86
Distinct callsigns
1
Country
NZ
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S C81B4D.

Country allocation

The ICAO 24-bit address C81B4D falls within the block assigned to New Zealand (NZ) by ICAO Annex 10, Volume III. Every aircraft registered in New Zealand receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
ZKHNZ - 86 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 ZKHNZ - Jul 15, 23:25 UTCJul 15, 23:40 UTC15m
2026-07-15 ZKHNZ - Jul 15, 22:35 UTCJul 15, 22:55 UTC20m
2026-07-15 ZKHNZ - Jul 15, 20:25 UTCJul 15, 20:40 UTC15m
2026-07-15 ZKHNZ - Jul 15, 19:15 UTCJul 15, 19:30 UTC15m
2026-07-11 ZKHNZ - Jul 11, 00:45 UTCJul 11, 00:55 UTC10m
2026-07-10 ZKHNZ - Jul 10, 23:45 UTCJul 11, 00:00 UTC15m
2026-07-08 ZKHNZ - Jul 8, 00:10 UTCJul 8, 00:20 UTC10m
2026-07-07 ZKHNZ - Jul 7, 23:15 UTCJul 7, 23:25 UTC10m
2026-07-02 ZKHNZ - Jul 2, 02:10 UTCJul 2, 02:20 UTC10m
2026-07-02 ZKHNZ - Jul 2, 00:50 UTCJul 2, 01:05 UTC15m
2026-07-01 ZKHNZ - Jul 1, 22:10 UTCJul 1, 22:20 UTC10m
2026-07-01 ZKHNZ - Jul 1, 20:40 UTCJul 1, 20:55 UTC15m
2026-07-01 ZKHNZ - Jul 1, 20:10 UTCJul 1, 20:20 UTC10m
2026-07-01 ZKHNZ - Jul 1, 19:00 UTCJul 1, 19:20 UTC20m
2026-06-27 ZKHNZ - Jun 27, 20:59 UTCJun 27, 21:10 UTC10m
2026-06-27 ZKHNZ - Jun 27, 19:24 UTCJun 27, 19:34 UTC10m
2026-06-24 ZKHNZ - Jun 24, 01:04 UTCJun 24, 01:19 UTC15m
2026-06-24 ZKHNZ - Jun 24, 00:15 UTCJun 24, 00:25 UTC10m
2026-06-23 ZKHNZ - Jun 23, 22:34 UTCJun 23, 22:49 UTC15m
2026-06-23 ZKHNZ - Jun 23, 20:59 UTCJun 23, 21:14 UTC15m
2026-06-23 ZKHNZ - Jun 23, 20:24 UTCJun 23, 20:40 UTC15m
2026-06-23 ZKHNZ - Jun 23, 19:04 UTCJun 23, 19:19 UTC15m
2026-06-19 ZKHNZ - Jun 19, 21:59 UTCJun 19, 22:14 UTC15m
2026-06-19 ZKHNZ - Jun 19, 20:49 UTCJun 19, 21:04 UTC15m
2026-06-17 ZKHNZ - Jun 17, 22:05 UTCJun 17, 22:15 UTC10m
2026-06-17 ZKHNZ - Jun 17, 20:50 UTCJun 17, 21:10 UTC20m
2026-06-17 ZKHNZ - Jun 17, 20:25 UTCJun 17, 20:35 UTC10m
2026-06-17 ZKHNZ - Jun 17, 19:10 UTCJun 17, 19:25 UTC15m
2026-06-14 ZKHNZ - Jun 14, 22:15 UTCJun 14, 22:30 UTC15m
2026-06-14 ZKHNZ - Jun 14, 20:50 UTCJun 14, 21:10 UTC20m
2026-06-14 ZKHNZ - Jun 14, 20:20 UTCJun 14, 20:30 UTC10m
2026-06-14 ZKHNZ - Jun 14, 19:05 UTCJun 14, 19:25 UTC20m
2026-06-10 ZKHNZ - Jun 10, 01:35 UTCJun 10, 01:45 UTC10m
2026-06-10 ZKHNZ - Jun 10, 00:05 UTCJun 10, 00:20 UTC15m
2026-06-03 ZKHNZ - Jun 3, 21:35 UTCJun 3, 21:50 UTC15m
2026-06-03 ZKHNZ - Jun 3, 20:35 UTCJun 3, 20:50 UTC15m
2026-06-03 ZKHNZ - Jun 3, 20:05 UTCJun 3, 20:20 UTC15m
2026-06-03 ZKHNZ - Jun 3, 19:10 UTCJun 3, 19:25 UTC15m
2026-06-02 ZKHNZ - Jun 2, 22:20 UTCJun 2, 22:35 UTC15m
2026-06-02 ZKHNZ - Jun 2, 20:55 UTCJun 2, 21:15 UTC20m
2026-06-02 ZKHNZ - Jun 2, 20:25 UTCJun 2, 20:35 UTC10m
2026-06-02 ZKHNZ - Jun 2, 19:10 UTCJun 2, 19:30 UTC20m
2026-05-27 ZKHNZ NPL → NPL May 27, 03:50 UTCMay 27, 04:04 UTC15m
2026-05-26 ZKHNZ - May 26, 20:20 UTCMay 26, 20:29 UTC10m
2026-05-26 ZKHNZ - May 26, 19:10 UTCMay 26, 19:25 UTC15m
2026-05-21 ZKHNZ - May 21, 21:00 UTCMay 21, 21:10 UTC10m
2026-05-21 ZKHNZ - May 21, 19:45 UTCMay 21, 20:05 UTC20m
2026-05-19 ZKHNZ - May 19, 20:30 UTCMay 19, 20:45 UTC15m
2026-05-19 ZKHNZ - May 19, 19:05 UTCMay 19, 19:25 UTC20m
2026-05-14 ZKHNZ - May 14, 03:25 UTCMay 14, 03:45 UTC20m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the ZK-HNZ page for operator, model, and routing details .

Mode-S C81B4D frequently asked

What is Mode-S code C81B4D?
C81B4D is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-HNZ.
Where is Mode-S C81B4D registered?
Mode-S code C81B4D is allocated to New Zealand (NZ). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is C81B4D broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81B4D, octal 62015515, decimal 13,114,189.
What flights does C81B4D operate?
Mode-S C81B4D has broadcast 1 distinct callsign, including ZKHNZ.