Apparatus

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sensors Mode-S transponder

C821C1

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-OXG · AIRBUS A-320

Hex
C821C1
Octal
62020701
Decimal
13,115,841
Country
NZ
Tail
ZK-OXG
Type
A320
No current signal · last broadcast Jul 26, 21:25 UTC
Flights observed
533
Distinct callsigns
20
Country
NZ
Last broadcast
Jul 26, 21:25 UTC

Last known position

Most recent position reported by Mode-S C821C1.

Country allocation

The ICAO 24-bit address C821C1 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
ANZ542 Air New Zealand 11 2026-07-23
ANZ638 Air New Zealand 10 2026-07-19
ANZ623 Air New Zealand 10 2026-07-22
ANZ582 - 10 2026-07-11
ANZ457 Air New Zealand 10 2026-07-26
ANZ406 Air New Zealand 10 2026-07-26
ANZ384 - 10 2026-07-03
ANZ377 - 10 2026-07-03
ANZ659 Air New Zealand 9 2026-07-22
ANZ644 Air New Zealand 9 2026-07-22
ANZ626 - 9 2026-07-18
ANZ605 - 9 2026-07-02
ANZ551 Air New Zealand 9 2026-07-25
ANZ547 - 9 2026-07-19
ANZ676 Air New Zealand 8 2026-07-23
ANZ625 - 8 2026-06-17
ANZ570 Air New Zealand 8 2026-07-21
ANZ558 - 8 2026-07-19
ANZ327 Air New Zealand 8 2026-07-22
ANZ686 - 7 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ANZ409 AKL → WLG Jul 26, 20:30 UTCJul 26, 21:20 UTC50m
2026-07-26 ANZ406 WLG → AKL Jul 26, 18:45 UTCJul 26, 19:30 UTC45m
2026-07-26 ANZ457 AKL → WLG Jul 26, 08:25 UTCJul 26, 09:15 UTC50m
2026-07-26 ANZ448 WLG → AKL Jul 26, 06:05 UTCJul 26, 06:50 UTC46m
2026-07-26 ANZ441 AKL → WLG Jul 26, 04:15 UTCJul 26, 05:05 UTC50m
2026-07-26 ANZ620 ZQN → AKL Jul 26, 01:40 UTCJul 26, 03:05 UTC1h 25m
2026-07-25 ANZ617 AKL → ZQN Jul 25, 22:45 UTCJul 26, 00:05 UTC1h 20m
2026-07-25 ANZ534 CHC → AKL Jul 25, 20:35 UTCJul 25, 21:40 UTC1h 5m
2026-07-25 ANZ551 AKL → CHC Jul 25, 03:10 UTCJul 25, 04:15 UTC1h 5m
2026-07-25 ANZ616 ZQN → AKL Jul 25, 00:30 UTCJul 25, 01:55 UTC1h 25m
2026-07-24 ANZ635 AKL → ZQN Jul 24, 22:00 UTCJul 24, 23:20 UTC1h 20m
2026-07-24 ANZ406 WLG → AKL Jul 24, 18:45 UTCJul 24, 19:35 UTC50m
2026-07-24 ANZ457 AKL → WLG Jul 24, 09:35 UTCJul 24, 10:20 UTC45m
2026-07-24 ANZ450 WLG → AKL Jul 24, 07:45 UTCJul 24, 08:35 UTC50m
2026-07-24 ANZ690 DUD → WLG Jul 24, 05:40 UTCJul 24, 06:40 UTC1h 0m
2026-07-24 ANZ689 WLG → DUD Jul 24, 03:45 UTCJul 24, 04:45 UTC1h 0m
2026-07-24 ANZ425 AKL → WLG Jul 24, 00:30 UTCJul 24, 01:15 UTC45m
2026-07-23 ANZ676 DUD → AKL Jul 23, 21:40 UTCJul 23, 23:10 UTC1h 30m
2026-07-23 ANZ673 AKL → DUD Jul 23, 19:20 UTCJul 23, 20:45 UTC1h 25m
2026-07-23 ANZ456 WLG → AKL Jul 23, 08:20 UTCJul 23, 09:05 UTC45m
2026-07-23 ANZ449 AKL → WLG Jul 23, 06:35 UTCJul 23, 07:20 UTC45m
2026-07-23 ANZ440 WLG → AKL Jul 23, 04:45 UTCJul 23, 05:30 UTC45m
2026-07-23 ANZ433 AKL → WLG Jul 23, 02:55 UTCJul 23, 03:40 UTC45m
2026-07-23 ANZ542 CHC → AKL Jul 23, 00:25 UTCJul 23, 01:35 UTC1h 10m
2026-07-22 ANZ644 ZQN → AKL Jul 22, 22:55 UTCJul 22, 23:30 UTC35m
2026-07-22 ANZ659 CHC → ZQN Jul 22, 21:00 UTCJul 22, 21:40 UTC40m
2026-07-22 ANZ327 WLG → CHC Jul 22, 19:05 UTCJul 22, 19:45 UTC40m
2026-07-22 ANZ623 AKL → ZQN Jul 22, 02:50 UTCJul 22, 04:15 UTC1h 25m
2026-07-22 ANZ542 CHC → AKL Jul 22, 00:15 UTCJul 22, 01:15 UTC1h 0m
2026-07-21 ANZ644 ZQN → AKL Jul 21, 22:40 UTCJul 21, 23:15 UTC35m
2026-07-21 ANZ659 CHC → ZQN Jul 21, 20:50 UTCJul 21, 21:30 UTC40m
2026-07-21 ANZ327 WLG → CHC Jul 21, 19:05 UTCJul 21, 19:45 UTC40m
2026-07-21 ANZ461 AKL → WLG Jul 21, 09:30 UTCJul 21, 10:20 UTC50m
2026-07-21 ANZ570 CHC → AKL Jul 21, 07:30 UTCJul 21, 08:30 UTC1h 0m
2026-07-21 ANZ1239 AKL → CHC Jul 21, 00:20 UTCJul 21, 01:30 UTC1h 10m
2026-07-20 ANZ422 WLG → AKL Jul 20, 22:30 UTCJul 20, 23:20 UTC50m
2026-07-20 ANZ409 AKL → WLG Jul 20, 20:30 UTCJul 20, 21:25 UTC55m
2026-07-20 ANZ406 WLG → AKL Jul 20, 18:50 UTCJul 20, 19:30 UTC40m
2026-07-20 ANZ449 AKL → WLG Jul 20, 08:35 UTCJul 20, 09:15 UTC40m
2026-07-20 ANZ578 CHC → AKL Jul 20, 06:25 UTCJul 20, 07:25 UTC1h 0m
2026-07-20 ANZ551 AKL → CHC Jul 20, 03:50 UTCJul 20, 05:00 UTC1h 10m
2026-07-20 ANZ616 - Jul 20, 01:20 UTCJul 20, 02:35 UTC1h 15m
2026-07-19 ANZ635 AKL → ZQN Jul 19, 22:40 UTCJul 20, 00:15 UTC1h 35m
2026-07-19 ANZ638 ZQN → AKL Jul 19, 19:35 UTCJul 19, 21:10 UTC1h 35m
2026-07-19 ANZ627 AKL → ZQN Jul 19, 07:35 UTCJul 19, 09:00 UTC1h 25m
2026-07-19 ANZ558 - Jul 19, 04:15 UTCJul 19, 05:20 UTC1h 5m
2026-07-19 ANZ547 - Jul 19, 02:10 UTCJul 19, 03:15 UTC1h 5m
2026-07-19 ANZ424 WLG → AKL Jul 19, 00:00 UTCJul 19, 00:45 UTC45m
2026-07-18 ANZ417 AKL → WLG Jul 18, 22:15 UTCJul 18, 23:00 UTC45m
2026-07-18 ANZ534 - Jul 18, 20:15 UTCJul 18, 21:15 UTC1h 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-OXG page for operator, model, and routing details .

Mode-S C821C1 frequently asked

What is Mode-S code C821C1?
C821C1 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-OXG.
Where is Mode-S C821C1 registered?
Mode-S code C821C1 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 C821C1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C821C1, octal 62020701, decimal 13,115,841.
What flights does C821C1 operate?
Mode-S C821C1 has broadcast 20 distinct callsigns, including ANZ542, ANZ638, ANZ623, ANZ582, ANZ457.