Apparatus

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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 5d ago
Flights observed
401
Distinct callsigns
20
Country
NZ
Last broadcast
5d 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
ANZ222L - 9 2026-07-25
ANZ223L - 7 2026-07-06
ANZ272L - 6 2026-07-16
ANZ172L Air New Zealand 6 2026-07-23
ANZ171L Air New Zealand 6 2026-07-23
ANZ143L - 6 2026-07-06
ANZ088L Air New Zealand 6 2026-07-21
ANZ763L - 5 2026-07-14
ANZ302L - 5 2026-07-19
ANZ275L - 5 2026-07-16
ANZ229L - 5 2026-07-23
ANZ226L - 5 2026-07-23
ANZ063L Air New Zealand 5 2026-06-22
ANZ841L - 4 2026-07-07
ANZ764L - 4 2026-07-14
ANZ323L - 4 2026-07-05
ANZ321L - 4 2026-06-29
ANZ308L - 4 2026-07-19
ANZ289L - 4 2026-07-12
ANZ282L Air New Zealand 4 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ANZ163L AKL → GIS Jul 26, 20:45 UTCJul 26, 21:25 UTC40m
2026-07-26 ANZ208L BHE → AKL Jul 26, 18:10 UTCJul 26, 19:20 UTC1h 10m
2026-07-26 ANZ205L AKL → BHE Jul 26, 06:55 UTCJul 26, 08:15 UTC1h 20m
2026-07-26 ANZ096L TUO → AKL Jul 26, 05:15 UTCJul 26, 06:00 UTC45m
2026-07-26 ANZ095L AKL → TUO Jul 26, 03:55 UTCJul 26, 04:25 UTC30m
2026-07-26 ANZ244L TRG → AKL Jul 26, 00:35 UTCJul 26, 01:05 UTC30m
2026-07-25 ANZ133L AKL → TRG Jul 25, 23:35 UTCJul 25, 23:55 UTC20m
2026-07-25 ANZ221L - Jul 25, 21:35 UTCJul 25, 22:05 UTC30m
2026-07-25 ANZ222L AKL → WRE Jul 25, 04:10 UTCJul 25, 04:35 UTC25m
2026-07-25 ANZ174L GIS → AKL Jul 25, 02:30 UTCJul 25, 03:20 UTC50m
2026-07-25 ANZ169L AKL → GIS Jul 25, 00:50 UTCJul 25, 01:30 UTC40m
2026-07-24 ANZ164L GIS → AKL Jul 24, 22:10 UTCJul 24, 23:05 UTC55m
2026-07-24 ANZ163L AKL → GIS Jul 24, 20:45 UTCJul 24, 21:20 UTC35m
2026-07-24 ANZ064L NSN → AKL Jul 24, 18:05 UTCJul 24, 19:20 UTC1h 15m
2026-07-24 ANZ087L AKL → NSN Jul 24, 08:25 UTCJul 24, 09:35 UTC1h 10m
2026-07-24 ANZ277L KKE → AKL Jul 24, 06:55 UTCJul 24, 07:20 UTC25m
2026-07-24 ANZ270L AKL → KKE Jul 24, 04:55 UTCJul 24, 05:25 UTC30m
2026-07-23 ANZ267L KKE → AKL Jul 23, 22:20 UTCJul 23, 22:50 UTC30m
2026-07-23 ANZ266L AKL → KKE Jul 23, 20:50 UTCJul 23, 21:15 UTC25m
2026-07-23 ANZ229L - Jul 23, 18:05 UTCJul 23, 18:30 UTC25m
2026-07-23 ANZ226L - Jul 23, 08:50 UTCJul 23, 09:15 UTC25m
2026-07-23 ANZ172L GIS → AKL Jul 23, 06:30 UTCJul 23, 07:15 UTC45m
2026-07-23 ANZ171L AKL → GIS Jul 23, 05:00 UTCJul 23, 05:45 UTC45m
2026-07-23 ANZ038L NPL → AKL Jul 23, 03:55 UTCJul 23, 04:20 UTC25m
2026-07-23 ANZ043L AKL → NPL Jul 23, 00:35 UTCJul 23, 01:00 UTC25m
2026-07-21 ANZ088L NSN → AKL Jul 21, 22:20 UTCJul 21, 23:25 UTC1h 5m
2026-07-21 ANZ061L - Jul 21, 20:10 UTCJul 21, 21:25 UTC1h 15m
2026-07-21 ANZ229L - Jul 21, 18:10 UTCJul 21, 18:35 UTC25m
2026-07-21 ANZ226L - Jul 21, 08:20 UTCJul 21, 08:40 UTC20m
2026-07-21 ANZ172L GIS → AKL Jul 21, 06:25 UTCJul 21, 07:10 UTC45m
2026-07-21 ANZ171L AKL → GIS Jul 21, 04:40 UTCJul 21, 05:25 UTC45m
2026-07-20 ANZ164L - Jul 20, 22:10 UTCJul 20, 22:55 UTC45m
2026-07-20 ANZ163L - Jul 20, 20:30 UTCJul 20, 21:15 UTC45m
2026-07-20 ANZ064L - Jul 20, 18:15 UTCJul 20, 19:20 UTC1h 5m
2026-07-20 ANZ073L AKL → NSN Jul 20, 03:05 UTCJul 20, 04:15 UTC1h 10m
2026-07-20 ANZ166L - Jul 20, 01:20 UTCJul 20, 02:00 UTC40m
2026-07-19 ANZ282L WLG → GIS Jul 19, 21:35 UTCJul 19, 22:30 UTC55m
2026-07-19 ANZ302L - Jul 19, 19:50 UTCJul 19, 20:20 UTC30m
2026-07-19 ANZ854L - Jul 19, 07:10 UTCJul 19, 07:45 UTC35m
2026-07-19 ANZ361L WLG → CHC Jul 19, 05:20 UTCJul 19, 06:05 UTC45m
2026-07-19 ANZ734L BHE → WLG Jul 19, 04:10 UTCJul 19, 04:30 UTC20m
2026-07-19 ANZ733L WLG → BHE Jul 19, 03:20 UTCJul 19, 03:35 UTC15m
2026-07-19 ANZ308L - Jul 19, 01:25 UTCJul 19, 01:55 UTC30m
2026-07-18 ANZ067L AKL → NSN Jul 18, 23:15 UTCJul 19, 00:25 UTC1h 10m
2026-07-18 ANZ221L - Jul 18, 21:40 UTCJul 18, 22:05 UTC25m
2026-07-18 ANZ222L - Jul 18, 04:10 UTCJul 18, 04:30 UTC20m
2026-07-18 ANZ012L NPE → AKL Jul 18, 00:00 UTCJul 18, 00:39 UTC40m
2026-07-17 ANZ005L AKL → NPE Jul 17, 22:20 UTCJul 17, 23:05 UTC45m
2026-07-17 ANZ229L - Jul 17, 18:00 UTCJul 17, 18:29 UTC30m
2026-07-17 ANZ226L - Jul 17, 08:30 UTCJul 17, 08:54 UTC25m

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 5d 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 ANZ222L, ANZ223L, ANZ272L, ANZ172L, ANZ171L.