Apparatus

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sensors Mode-S transponder

C81A90

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-NES · DE HAVILLAND DHC-8-300 Dash 8

Hex
C81A90
Octal
62015220
Decimal
13,114,000
Country
NZ
Tail
ZK-NES
Type
DH8C
No current signal · last broadcast 6d ago
Flights observed
360
Distinct callsigns
20
Country
NZ
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S C81A90.

Country allocation

The ICAO 24-bit address C81A90 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 20 distinct

Callsign Airline Flights Last seen
ANZ235L - 8 2026-07-07
ANZ230L - 8 2026-07-07
ANZ277L - 7 2026-06-23
ANZ270L - 7 2026-06-23
ANZ769L - 6 2026-06-29
ANZ763L - 6 2026-07-03
ANZ507L Air New Zealand 6 2026-06-29
ANZ264L - 6 2026-06-15
ANZ251L - 6 2026-06-15
ANZ792L - 5 2026-06-29
ANZ334L Air New Zealand 5 2026-07-06
ANZ262L Air New Zealand 5 2026-05-18
ANZ255L - 5 2026-06-15
ANZ208L Air New Zealand 5 2026-05-22
ANZ171L Air New Zealand 5 2026-06-03
ANZ092L Air New Zealand 5 2026-06-04
ANZ091L Air New Zealand 5 2026-06-04
ANZ885L Air New Zealand 4 2026-06-10
ANZ884L Air New Zealand 4 2026-06-10
ANZ796L - 4 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-08 ANZ375L - Jul 8, 06:20 UTCJul 8, 07:10 UTC50m
2026-07-08 ANZ259L - Jul 8, 01:30 UTCJul 8, 02:45 UTC1h 15m
2026-07-07 ANZ260L - Jul 7, 23:45 UTCJul 8, 00:45 UTC1h 0m
2026-07-07 ANZ726L - Jul 7, 22:40 UTCJul 7, 23:00 UTC20m
2026-07-07 ANZ725L WLG → BHE Jul 7, 20:15 UTCJul 7, 20:30 UTC15m
2026-07-07 ANZ235L - Jul 7, 06:10 UTCJul 7, 07:10 UTC1h 0m
2026-07-07 ANZ230L - Jul 7, 04:30 UTCJul 7, 05:35 UTC1h 5m
2026-07-06 ANZ334L CHC → WLG Jul 6, 19:40 UTCJul 6, 20:40 UTC1h 0m
2026-07-03 ANZ763L - Jul 3, 05:50 UTCJul 3, 06:20 UTC30m
2026-07-03 ANZ763L - Jul 3, 05:00 UTCJul 3, 05:15 UTC15m
2026-07-03 ANZ764L - Jul 3, 03:10 UTCJul 3, 04:25 UTC1h 15m
2026-06-30 ANZ763L - Jun 30, 05:40 UTCJun 30, 06:10 UTC30m
2026-06-30 ANZ763L - Jun 30, 04:50 UTCJun 30, 05:10 UTC20m
2026-06-30 ANZ764L - Jun 30, 03:00 UTCJun 30, 04:15 UTC1h 15m
2026-06-29 ANZ769L - Jun 29, 23:54 UTCJun 30, 00:20 UTC25m
2026-06-29 ANZ769L - Jun 29, 23:05 UTCJun 29, 23:14 UTC10m
2026-06-29 ANZ792L WLG → NPL Jun 29, 21:05 UTCJun 29, 21:44 UTC40m
2026-06-29 ANZ507L GIS → WLG Jun 29, 18:39 UTCJun 29, 19:29 UTC50m
2026-06-29 ANZ286L - Jun 29, 06:14 UTCJun 29, 07:09 UTC55m
2026-06-29 ANZ312L - Jun 29, 03:10 UTCJun 29, 03:29 UTC20m
2026-06-28 ANZ305L - Jun 28, 21:30 UTCJun 28, 21:50 UTC20m
2026-06-28 ANZ190L - Jun 28, 19:14 UTCJun 28, 20:04 UTC50m
2026-06-28 ANZ199L - Jun 28, 05:49 UTCJun 28, 06:49 UTC1h 0m
2026-06-28 ANZ795L - Jun 28, 04:25 UTCJun 28, 05:04 UTC40m
2026-06-28 ANZ796L WLG → NPL Jun 28, 03:05 UTCJun 28, 03:50 UTC45m
2026-06-27 ANZ793L NPL → WLG Jun 27, 22:25 UTCJun 27, 23:10 UTC45m
2026-06-27 ANZ792L WLG → NPL Jun 27, 21:04 UTCJun 27, 21:50 UTC45m
2026-06-27 ANZ302L NSN → WLG Jun 27, 19:49 UTCJun 27, 20:14 UTC25m
2026-06-26 ANZ305L - Jun 26, 21:55 UTCJun 26, 22:14 UTC20m
2026-06-26 ANZ791L NPL → WLG Jun 26, 20:20 UTCJun 26, 21:10 UTC50m
2026-06-25 ANZ796L WLG → NPL Jun 25, 02:54 UTCJun 25, 03:40 UTC45m
2026-06-25 ANZ730L - Jun 25, 01:35 UTCJun 25, 01:54 UTC20m
2026-06-25 ANZ729L WLG → BHE Jun 25, 00:35 UTCJun 25, 00:49 UTC15m
2026-06-24 ANZ231L - Jun 24, 20:35 UTCJun 24, 21:29 UTC55m
2026-06-24 ANZ238L - Jun 24, 18:50 UTCJun 24, 19:49 UTC1h 0m
2026-06-24 ANZ235L - Jun 24, 06:04 UTCJun 24, 06:59 UTC55m
2026-06-24 ANZ230L - Jun 24, 04:20 UTCJun 24, 05:24 UTC1h 5m
2026-06-24 ANZ730L - Jun 24, 01:44 UTCJun 24, 02:00 UTC15m
2026-06-24 ANZ729L WLG → BHE Jun 24, 00:40 UTCJun 24, 00:55 UTC15m
2026-06-23 ANZ793L NPL → WLG Jun 23, 22:34 UTCJun 23, 23:14 UTC40m
2026-06-23 ANZ792L WLG → NPL Jun 23, 20:54 UTCJun 23, 21:45 UTC50m
2026-06-23 ANZ507L GIS → WLG Jun 23, 18:39 UTCJun 23, 19:34 UTC55m
2026-06-23 ANZ161L - Jun 23, 07:25 UTCJun 23, 08:09 UTC45m
2026-06-23 ANZ277L - Jun 23, 05:54 UTCJun 23, 06:19 UTC25m
2026-06-23 ANZ270L - Jun 23, 04:29 UTCJun 23, 04:50 UTC20m
2026-06-22 ANZ166L - Jun 22, 23:35 UTCJun 23, 00:30 UTC55m
2026-06-22 ANZ282L - Jun 22, 21:19 UTCJun 22, 22:05 UTC45m
2026-06-22 ANZ302L NSN → WLG Jun 22, 19:54 UTCJun 22, 20:14 UTC20m
2026-06-22 ANZ087L - Jun 22, 08:19 UTCJun 22, 09:00 UTC40m
2026-06-22 ANZ096L - Jun 22, 06:15 UTCJun 22, 06:49 UTC35m

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-NES page for operator, model, and routing details .

Mode-S C81A90 frequently asked

What is Mode-S code C81A90?
C81A90 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-NES.
Where is Mode-S C81A90 registered?
Mode-S code C81A90 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 C81A90 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81A90, octal 62015220, decimal 13,114,000.
What flights does C81A90 operate?
Mode-S C81A90 has broadcast 20 distinct callsigns, including ANZ235L, ANZ230L, ANZ277L, ANZ270L, ANZ769L.