Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

C81A91

ICAO 24-bit transponder address · allocated to New Zealand

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

Hex
C81A91
Octal
62015221
Decimal
13,114,001
Country
NZ
Tail
ZK-NET
Type
DH8C
No current signal · last broadcast 2h ago
Flights observed
208
Distinct callsigns
20
Country
NZ
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S C81A91.

Country allocation

The ICAO 24-bit address C81A91 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
ANZ275L Air New Zealand 4 2026-06-05
ANZ272L Air New Zealand 4 2026-06-05
ANZ238L - 4 2026-05-27
ANZ231L Air New Zealand 4 2026-05-27
ANZ223L - 4 2026-06-07
ANZ222L - 4 2026-06-07
ANZ739L Air New Zealand 3 2026-06-03
ANZ736L Air New Zealand 3 2026-06-03
ANZ375L - 3 2026-06-13
ANZ321L - 3 2026-06-14
ANZ312L Air New Zealand 3 2026-06-12
ANZ258L Air New Zealand 3 2026-05-10
ANZ257L Air New Zealand 3 2026-05-10
ANZ146L Air New Zealand 3 2026-06-08
ANZ143L Air New Zealand 3 2026-06-04
ANZ127L Air New Zealand 3 2026-06-08
ANZ063L Air New Zealand 3 2026-06-09
ANZ024L Air New Zealand 3 2026-06-05
ANZ019L Air New Zealand 3 2026-06-05
ANZ885L Air New Zealand 2 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-16 ANZ764L - Jun 16, 03:20 UTCJun 16, 03:35 UTC15m
2026-06-16 ANZ975L AKL → GIS Jun 16, 02:04 UTCJun 16, 02:34 UTC30m
2026-06-16 ANZ976L - Jun 16, 00:45 UTCJun 16, 01:04 UTC20m
2026-06-14 ANZ841L - Jun 14, 19:10 UTCJun 14, 19:25 UTC15m
2026-06-14 ANZ321L - Jun 14, 07:05 UTCJun 14, 07:15 UTC10m
2026-06-14 ANZ895L - Jun 14, 04:40 UTCJun 14, 05:25 UTC45m
2026-06-14 ANZ886L WLG → NPE Jun 14, 03:20 UTCJun 14, 04:05 UTC45m
2026-06-14 ANZ308L NSN → WLG Jun 14, 01:45 UTCJun 14, 01:55 UTC10m
2026-06-14 ANZ844L CHC → NSN Jun 14, 00:00 UTCJun 14, 00:15 UTC15m
2026-06-13 ANZ375L WLG → CHC Jun 13, 06:05 UTCJun 13, 06:55 UTC50m
2026-06-12 ANZ885L NPE → WLG Jun 12, 23:10 UTCJun 12, 23:55 UTC45m
2026-06-12 ANZ884L WLG → NPE Jun 12, 21:45 UTCJun 12, 22:25 UTC40m
2026-06-12 ANZ791L NPL → WLG Jun 12, 19:00 UTCJun 12, 19:45 UTC45m
2026-06-12 ANZ798L WLG → NPL Jun 12, 09:05 UTCJun 12, 09:45 UTC40m
2026-06-12 ANZ304L NSN → WLG Jun 12, 06:20 UTCJun 12, 06:30 UTC10m
2026-06-12 ANZ317L WLG → NSN Jun 12, 04:55 UTCJun 12, 05:10 UTC15m
2026-06-12 ANZ312L NSN → WLG Jun 12, 03:20 UTCJun 12, 03:30 UTC10m
2026-06-12 ANZ309L WLG → NSN Jun 12, 01:50 UTCJun 12, 02:05 UTC15m
2026-06-11 ANZ793L NPL → WLG Jun 11, 22:35 UTCJun 11, 23:15 UTC40m
2026-06-11 ANZ792L WLG → NPL Jun 11, 21:15 UTCJun 11, 22:00 UTC45m
2026-06-11 ANZ302L NSN → WLG Jun 11, 20:05 UTCJun 11, 20:15 UTC10m
2026-06-11 ANZ089L AKL → NSN Jun 11, 00:40 UTCJun 11, 01:25 UTC45m
2026-06-10 ANZ088L NSN → AKL Jun 10, 22:55 UTCJun 10, 23:40 UTC45m
2026-06-09 ANZ063L AKL → NSN Jun 9, 19:30 UTCJun 9, 20:10 UTC40m
2026-06-09 ANZ052L NPL → AKL Jun 9, 03:35 UTCJun 9, 04:15 UTC40m
2026-06-09 ANZ041L AKL → NPL Jun 9, 02:20 UTCJun 9, 03:00 UTC40m
2026-06-09 ANZ038L NPL → AKL Jun 9, 00:05 UTCJun 9, 00:45 UTC40m
2026-06-08 ANZ043L AKL → NPL Jun 8, 22:35 UTCJun 8, 23:20 UTC45m
2026-06-08 ANZ146L TRG → AKL Jun 8, 21:05 UTCJun 8, 21:30 UTC25m
2026-06-08 ANZ127L AKL → TRG Jun 8, 19:50 UTCJun 8, 20:20 UTC30m
2026-06-08 ANZ229L - Jun 8, 18:15 UTCJun 8, 18:35 UTC20m
2026-06-08 ANZ226L - Jun 8, 08:20 UTCJun 8, 08:35 UTC15m
2026-06-08 ANZ172L GIS → AKL Jun 8, 06:15 UTCJun 8, 07:10 UTC55m
2026-06-08 ANZ171L AKL → GIS Jun 8, 04:40 UTCJun 8, 05:20 UTC40m
2026-06-08 ANZ212L BHE → AKL Jun 8, 02:50 UTCJun 8, 03:45 UTC55m
2026-06-08 ANZ509L AKL → BHE Jun 8, 00:20 UTCJun 8, 01:30 UTC1h 10m
2026-06-07 ANZ221L - Jun 7, 21:50 UTCJun 7, 22:20 UTC30m
2026-06-07 ANZ220L - Jun 7, 20:45 UTCJun 7, 21:00 UTC15m
2026-06-07 ANZ223L - Jun 7, 05:30 UTCJun 7, 06:00 UTC30m
2026-06-07 ANZ222L - Jun 7, 04:10 UTCJun 7, 04:25 UTC15m
2026-06-07 ANZ273L KKE → AKL Jun 7, 01:15 UTCJun 7, 01:40 UTC25m
2026-06-06 ANZ276L AKL → KKE Jun 6, 23:39 UTCJun 7, 00:05 UTC25m
2026-06-06 ANZ128L TRG → AKL Jun 6, 21:54 UTCJun 6, 22:20 UTC25m
2026-06-06 ANZ129L AKL → TRG Jun 6, 20:39 UTCJun 6, 21:09 UTC30m
2026-06-06 ANZ082L NSN → AKL Jun 6, 05:45 UTCJun 6, 06:30 UTC45m
2026-06-06 ANZ079L AKL → NSN Jun 6, 03:30 UTCJun 6, 04:15 UTC45m
2026-06-06 ANZ225L - Jun 6, 00:40 UTCJun 6, 00:55 UTC15m
2026-06-05 ANZ224L - Jun 5, 23:30 UTCJun 5, 23:50 UTC20m
2026-06-05 ANZ275L KKE → AKL Jun 5, 18:20 UTCJun 5, 18:40 UTC20m
2026-06-05 ANZ272L AKL → KKE Jun 5, 08:45 UTCJun 5, 09:15 UTC30m

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

Mode-S C81A91 frequently asked

What is Mode-S code C81A91?
C81A91 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-NET.
Where is Mode-S C81A91 registered?
Mode-S code C81A91 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 C81A91 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81A91, octal 62015221, decimal 13,114,001.
What flights does C81A91 operate?
Mode-S C81A91 has broadcast 20 distinct callsigns, including ANZ275L, ANZ272L, ANZ238L, ANZ231L, ANZ223L.