Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

C81A5B

ICAO 24-bit transponder address · allocated to New Zealand

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

Hex
C81A5B
Octal
62015133
Decimal
13,113,947
Country
NZ
Tail
ZK-NER
Type
DH8C
No current signal · last broadcast 18h ago
Flights observed
218
Distinct callsigns
20
Country
NZ
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S C81A5B.

Country allocation

The ICAO 24-bit address C81A5B 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
ANZ264L Air New Zealand 5 2026-05-22
ANZ255L Air New Zealand 5 2026-05-22
ANZ238L - 5 2026-05-26
ANZ235L Air New Zealand 5 2026-05-25
ANZ231L Air New Zealand 5 2026-05-26
ANZ277L Air New Zealand 4 2026-05-04
ANZ275L Air New Zealand 4 2026-05-04
ANZ272L Air New Zealand 4 2026-05-04
ANZ270L Air New Zealand 4 2026-05-04
ANZ230L Air New Zealand 4 2026-05-22
ANZ793L Air New Zealand 3 2026-05-24
ANZ792L Air New Zealand 3 2026-05-24
ANZ730L Air New Zealand 3 2026-05-24
ANZ729L Air New Zealand 3 2026-05-24
ANZ336L Air New Zealand 3 2026-05-11
ANZ317L Air New Zealand 3 2026-05-14
ANZ304L Air New Zealand 3 2026-05-14
ANZ276L Air New Zealand 3 2026-05-16
ANZ273L Air New Zealand 3 2026-05-17
ANZ251L Air New Zealand 3 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ANZ736L BHE → WLG May 29, 06:40 UTCMay 29, 06:50 UTC10m
2026-05-28 ANZ350L CHC → WLG May 28, 23:35 UTCMay 29, 00:15 UTC40m
2026-05-28 ANZ831L - May 28, 22:15 UTCMay 28, 22:35 UTC20m
2026-05-28 ANZ830L - May 28, 21:00 UTCMay 28, 21:20 UTC20m
2026-05-28 ANZ331L WLG → CHC May 28, 18:50 UTCMay 28, 19:45 UTC55m
2026-05-28 ANZ986L NSN → WLG May 28, 18:05 UTCMay 28, 18:15 UTC10m
2026-05-28 ANZ087L AKL → NSN May 28, 08:25 UTCMay 28, 09:15 UTC50m
2026-05-28 ANZ082L NSN → AKL May 28, 06:15 UTCMay 28, 07:05 UTC50m
2026-05-27 ANZ975L AKL → GIS May 27, 06:49 UTCMay 27, 06:55 UTC5m
2026-05-26 ANZ231L ROT → WLG May 26, 20:40 UTCMay 26, 21:44 UTC1h 5m
2026-05-26 ANZ238L - May 26, 18:55 UTCMay 26, 19:50 UTC55m
2026-05-26 ANZ257L TRG → WLG May 26, 05:59 UTCMay 26, 07:10 UTC1h 10m
2026-05-26 ANZ258L WLG → TRG May 26, 04:15 UTCMay 26, 05:20 UTC1h 5m
2026-05-25 ANZ231L ROT → WLG May 25, 20:34 UTCMay 25, 21:35 UTC1h 0m
2026-05-25 ANZ238L - May 25, 18:55 UTCMay 25, 19:44 UTC50m
2026-05-25 ANZ235L ROT → WLG May 25, 06:05 UTCMay 25, 07:15 UTC1h 10m
2026-05-25 - - May 25, 04:20 UTCMay 25, 05:10 UTC50m
2026-05-24 ANZ793L NPL → WLG May 24, 23:05 UTCMay 24, 23:20 UTC15m
2026-05-24 ANZ792L WLG → NPL May 24, 21:20 UTCMay 24, 21:45 UTC25m
2026-05-24 ANZ302L NSN → WLG May 24, 20:25 UTCMay 24, 20:40 UTC15m
2026-05-24 ANZ321L WLG → NSN May 24, 06:35 UTCMay 24, 06:45 UTC10m
2026-05-24 ANZ895L NPE → WLG May 24, 04:40 UTCMay 24, 05:25 UTC45m
2026-05-24 ANZ886L WLG → NPE May 24, 03:20 UTCMay 24, 04:05 UTC45m
2026-05-24 ANZ730L BHE → WLG May 24, 01:40 UTCMay 24, 01:45 UTC5m
2026-05-24 ANZ729L WLG → BHE May 24, 00:35 UTCMay 24, 00:40 UTC5m
2026-05-23 ANZ306L NSN → WLG May 23, 23:10 UTCMay 23, 23:20 UTC10m
2026-05-23 ANZ305L WLG → NSN May 23, 21:35 UTCMay 23, 21:45 UTC10m
2026-05-23 ANZ261L TRG → WLG May 23, 03:35 UTCMay 23, 04:40 UTC1h 5m
2026-05-23 ANZ252L WLG → TRG May 23, 01:50 UTCMay 23, 02:50 UTC1h 0m
2026-05-22 ANZ255L TRG → WLG May 22, 23:20 UTCMay 23, 00:20 UTC1h 0m
2026-05-22 ANZ264L WLG → TRG May 22, 21:00 UTCMay 22, 22:05 UTC1h 5m
2026-05-22 ANZ251L TRG → WLG May 22, 18:40 UTCMay 22, 19:50 UTC1h 10m
2026-05-22 ANZ262L WLG → TRG May 22, 08:15 UTCMay 22, 09:15 UTC1h 0m
2026-05-22 ANZ235L ROT → WLG May 22, 06:20 UTCMay 22, 07:20 UTC1h 0m
2026-05-22 ANZ230L WLG → ROT May 22, 04:40 UTCMay 22, 05:35 UTC55m
2026-05-22 ANZ314L NSN → WLG May 22, 02:45 UTCMay 22, 02:55 UTC10m
2026-05-22 ANZ323L WLG → NSN May 22, 01:20 UTCMay 22, 01:30 UTC10m
2026-05-21 ANZ334L CHC → WLG May 21, 19:30 UTCMay 21, 20:15 UTC45m
2026-05-19 ANZ948L CHC → NSN May 19, 02:05 UTCMay 19, 03:10 UTC1h 5m
2026-05-19 ANZ945L AKL → NPL May 19, 00:10 UTCMay 19, 01:25 UTC1h 15m
2026-05-18 ANZ763L NPL → CHC May 18, 05:45 UTCMay 18, 06:10 UTC25m
2026-05-18 ANZ763L NPL → CHC May 18, 04:55 UTCMay 18, 05:10 UTC15m
2026-05-18 ANZ764L CHC → NPL May 18, 03:01 UTCMay 18, 04:15 UTC1h 15m
2026-05-18 ANZ357L WLG → CHC May 18, 01:10 UTCMay 18, 02:00 UTC50m
2026-05-17 ANZ255L TRG → WLG May 17, 23:20 UTCMay 18, 00:20 UTC1h 0m
2026-05-17 ANZ264L WLG → TRG May 17, 21:05 UTCMay 17, 22:05 UTC1h 0m
2026-05-17 ANZ251L TRG → WLG May 17, 18:40 UTCMay 17, 19:45 UTC1h 5m
2026-05-17 ANZ143L AKL → TRG May 17, 06:55 UTCMay 17, 07:20 UTC25m
2026-05-17 ANZ066L NSN → AKL May 17, 04:50 UTCMay 17, 05:45 UTC55m
2026-05-17 ANZ073L AKL → NSN May 17, 02:25 UTCMay 17, 03:15 UTC50m

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

Mode-S C81A5B frequently asked

What is Mode-S code C81A5B?
C81A5B is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-NER.
Where is Mode-S C81A5B registered?
Mode-S code C81A5B 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 C81A5B broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81A5B, octal 62015133, decimal 13,113,947.
What flights does C81A5B operate?
Mode-S C81A5B has broadcast 20 distinct callsigns, including ANZ264L, ANZ255L, ANZ238L, ANZ235L, ANZ231L.