Apparatus

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sensors Mode-S transponder

C81D80

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-OKN · BOEING 777-300ER

Hex
C81D80
Octal
62016600
Decimal
13,114,752
Country
NZ
Tail
ZK-OKN
Type
B77W
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
178
Distinct callsigns
20
Country
NZ
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S C81D80.

Country allocation

The ICAO 24-bit address C81D80 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
ANZ284 Air New Zealand 28 2026-07-25
ANZ283 Air New Zealand 24 2026-07-26
ANZ282 - 14 2026-07-14
ANZ281 - 14 2026-07-15
ANZ5 Air New Zealand 12 2026-07-23
ANZ6 Air New Zealand 10 2026-07-22
ANZ24 - 5 2026-07-16
ANZ23 Air New Zealand 5 2026-07-17
ANZ176 Air New Zealand 5 2026-04-23
ANZ104 - 5 2026-07-18
ANZ99 Air New Zealand 4 2026-04-25
ANZ953 - 4 2026-07-12
ANZ945 - 4 2026-07-03
ANZ90 Air New Zealand 4 2026-04-26
ANZ146 Air New Zealand 4 2026-07-22
ANZ145 Air New Zealand 4 2026-07-21
ANZ103 - 4 2026-07-17
ANZ175 Air New Zealand 3 2026-04-23
ANZ95 Air New Zealand 2 2026-04-27
ANZ946 Air New Zealand 2 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ANZ283 SIN → AKL Jul 26, 20:10 UTCJul 26, 20:35 UTC25m
2026-07-26 ANZ283 SIN → AKL Jul 26, 17:40 UTCJul 26, 18:35 UTC55m
2026-07-25 ANZ284 AKL → SIN Jul 25, 22:45 UTCJul 26, 03:10 UTC4h 25m
2026-07-25 ANZ283 SIN → AKL Jul 25, 18:10 UTCJul 25, 20:45 UTC2h 35m
2026-07-25 ANZ283 SIN → AKL Jul 25, 12:15 UTCJul 25, 12:25 UTC10m
2026-07-25 ANZ284 AKL → SIN Jul 25, 09:55 UTCJul 25, 10:05 UTC10m
2026-07-24 ANZ284 AKL → SIN Jul 24, 23:10 UTCJul 25, 03:05 UTC3h 55m
2026-07-24 ANZ283 SIN → AKL Jul 24, 11:15 UTCJul 24, 20:10 UTC8h 55m
2026-07-24 ANZ284 AKL → SIN Jul 24, 09:00 UTCJul 24, 09:15 UTC15m
2026-07-23 ANZ284 AKL → SIN Jul 23, 22:35 UTCJul 24, 02:30 UTC3h 55m
2026-07-23 ANZ5 LAX → AKL Jul 23, 17:15 UTCJul 23, 17:45 UTC30m
2026-07-23 ANZ5 LAX → AKL Jul 23, 05:35 UTCJul 23, 06:05 UTC30m
2026-07-22 ANZ6 AKL → LAX Jul 22, 19:30 UTCJul 22, 20:10 UTC40m
2026-07-22 ANZ146 BNE → AKL Jul 22, 02:40 UTCJul 22, 05:25 UTC2h 45m
2026-07-21 ANZ145 AKL → BNE Jul 21, 21:40 UTCJul 22, 00:50 UTC3h 10m
2026-07-19 ANZ29 IAH → AKL Jul 19, 03:15 UTCJul 19, 17:10 UTC13h 55m
2026-07-18 ANZ28 AKL → IAH Jul 18, 08:35 UTCJul 18, 21:35 UTC13h 0m
2026-07-18 ANZ104 - Jul 18, 02:40 UTCJul 18, 05:20 UTC2h 41m
2026-07-17 ANZ103 - Jul 17, 21:30 UTCJul 18, 00:19 UTC2h 50m
2026-07-17 ANZ23 YVR → AKL Jul 17, 05:45 UTCJul 17, 18:29 UTC12h 45m
2026-07-16 ANZ24 - Jul 16, 08:35 UTCJul 16, 21:10 UTC12h 35m
2026-07-15 ANZ281 - Jul 15, 12:45 UTCJul 15, 15:40 UTC2h 55m
2026-07-15 ANZ281 - Jul 15, 06:30 UTCJul 15, 06:40 UTC10m
2026-07-14 ANZ282 - Jul 14, 22:20 UTCJul 14, 22:30 UTC10m
2026-07-14 ANZ282 - Jul 14, 12:20 UTCJul 14, 15:30 UTC3h 10m
2026-07-14 ANZ293 - Jul 14, 06:20 UTCJul 14, 06:35 UTC15m
2026-07-13 ANZ293 - Jul 13, 10:25 UTCJul 14, 04:40 UTC18h 15m
2026-07-13 ANZ292 - Jul 13, 08:10 UTCJul 14, 04:40 UTC20h 30m
2026-07-12 ANZ953 - Jul 12, 22:25 UTCJul 13, 05:15 UTC6h 50m
2026-07-12 ANZ283 - Jul 12, 19:55 UTCJul 12, 20:10 UTC15m
2026-07-12 ANZ283 - Jul 12, 11:20 UTCJul 12, 18:15 UTC6h 55m
2026-07-12 ANZ284 - Jul 12, 09:00 UTCJul 12, 09:10 UTC10m
2026-07-11 ANZ284 - Jul 11, 22:55 UTCJul 12, 02:10 UTC3h 15m
2026-07-11 ANZ283 - Jul 11, 20:15 UTCJul 11, 20:35 UTC20m
2026-07-11 ANZ283 - Jul 11, 17:55 UTCJul 11, 18:35 UTC40m
2026-07-11 ANZ284 - Jul 11, 01:30 UTCJul 11, 02:25 UTC55m
2026-07-10 ANZ284 - Jul 10, 23:25 UTCJul 10, 23:35 UTC10m
2026-07-10 ANZ283 - Jul 10, 17:10 UTCJul 10, 19:55 UTC2h 45m
2026-07-10 ANZ283 - Jul 10, 11:05 UTCJul 10, 11:15 UTC10m
2026-07-10 ANZ284 - Jul 10, 08:40 UTCJul 10, 08:50 UTC10m
2026-07-09 ANZ284 - Jul 9, 22:35 UTCJul 10, 01:40 UTC3h 5m
2026-07-09 ANZ283 - Jul 9, 17:10 UTCJul 9, 19:50 UTC2h 40m
2026-07-08 ANZ284 - Jul 8, 22:30 UTCJul 9, 02:40 UTC4h 10m
2026-07-08 ANZ903 PPT → AKL Jul 8, 14:55 UTCJul 8, 20:10 UTC5h 15m
2026-07-08 ANZ902 - Jul 8, 08:35 UTCJul 8, 12:55 UTC4h 20m
2026-07-07 ANZ971 - Jul 7, 23:30 UTCJul 8, 06:15 UTC6h 45m
2026-07-07 ANZ29 - Jul 7, 03:15 UTCJul 7, 17:05 UTC13h 50m
2026-07-06 ANZ28 - Jul 6, 09:20 UTCJul 6, 22:05 UTC12h 45m
2026-07-06 ANZ104 SYD → AKL Jul 6, 02:15 UTCJul 6, 04:45 UTC2h 30m
2026-07-05 ANZ103 AKL → SYD Jul 5, 21:35 UTCJul 6, 00:35 UTC3h 0m

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

Mode-S C81D80 frequently asked

What is Mode-S code C81D80?
C81D80 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-OKN.
Where is Mode-S C81D80 registered?
Mode-S code C81D80 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 C81D80 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81D80, octal 62016600, decimal 13,114,752.
What flights does C81D80 operate?
Mode-S C81D80 has broadcast 20 distinct callsigns, including ANZ284, ANZ283, ANZ282, ANZ281, ANZ5.