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
Broadcasting now · callsign ANZ428 · 4,375 ft
Flights observed
212
Distinct callsigns
20
Country
NZ
Last broadcast
1h ago

Current position

C821C1 is currently broadcasting. Map zoomed to live position.

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
ANZ637 Air New Zealand 5 2026-05-05
ANZ634 Air New Zealand 5 2026-05-05
ANZ625 Air New Zealand 5 2026-05-27
ANZ608 Air New Zealand 5 2026-05-01
ANZ605 Air New Zealand 5 2026-04-30
ANZ457 Air New Zealand 5 2026-05-25
ANZ407 Air New Zealand 5 2026-05-04
ANZ377 Air New Zealand 5 2026-04-30
ANZ686 Air New Zealand 4 2026-05-29
ANZ681 Air New Zealand 4 2026-05-29
ANZ676 Air New Zealand 4 2026-04-29
ANZ607 Air New Zealand 4 2026-05-01
ANZ600 Air New Zealand 4 2026-04-30
ANZ570 Air New Zealand 4 2026-04-15
ANZ567 Air New Zealand 4 2026-05-28
ANZ547 Air New Zealand 4 2026-05-28
ANZ542 Air New Zealand 4 2026-05-26
ANZ440 Air New Zealand 4 2026-05-27
ANZ433 Air New Zealand 4 2026-05-27
ANZ406 Air New Zealand 4 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ANZ686 DUD → WLG May 29, 23:05 UTCMay 30, 00:00 UTC55m
2026-05-29 ANZ681 WLG → DUD May 29, 21:05 UTCMay 29, 22:05 UTC1h 0m
2026-05-29 ANZ405 AKL → WLG May 29, 19:10 UTCMay 29, 20:00 UTC50m
2026-05-29 ANZ574 CHC → AKL May 29, 08:45 UTCMay 29, 09:50 UTC1h 5m
2026-05-29 ANZ563 AKL → CHC May 29, 06:35 UTCMay 29, 07:45 UTC1h 10m
2026-05-28 ANZ612 ZQN → AKL May 28, 23:00 UTCMay 29, 00:15 UTC1h 15m
2026-05-28 ANZ613 AKL → ZQN May 28, 20:15 UTCMay 28, 21:50 UTC1h 35m
2026-05-28 ANZ582 CHC → AKL May 28, 18:00 UTCMay 28, 19:00 UTC1h 0m
2026-05-28 ANZ567 AKL → CHC May 28, 07:25 UTCMay 28, 08:35 UTC1h 10m
2026-05-28 ANZ558 CHC → AKL May 28, 04:20 UTCMay 28, 05:25 UTC1h 5m
2026-05-28 ANZ547 AKL → CHC May 28, 02:10 UTCMay 28, 03:20 UTC1h 10m
2026-05-28 ANZ424 WLG → AKL May 28, 00:10 UTCMay 28, 00:55 UTC45m
2026-05-27 ANZ417 AKL → WLG May 27, 22:20 UTCMay 27, 23:10 UTC50m
2026-05-27 ANZ638 ZQN → AKL May 27, 19:25 UTCMay 27, 20:45 UTC1h 20m
2026-05-27 ANZ625 AKL → ZQN May 27, 06:09 UTCMay 27, 07:45 UTC1h 35m
2026-05-27 ANZ440 WLG → AKL May 27, 04:14 UTCMay 27, 05:04 UTC50m
2026-05-27 ANZ433 AKL → WLG May 27, 02:19 UTCMay 27, 03:09 UTC50m
2026-05-26 ANZ538 CHC → AKL May 26, 23:19 UTCMay 27, 00:25 UTC1h 5m
2026-05-26 ANZ527 AKL → CHC May 26, 21:14 UTCMay 26, 22:25 UTC1h 10m
2026-05-26 ANZ406 WLG → AKL May 26, 18:40 UTCMay 26, 19:25 UTC45m
2026-05-26 ANZ455 WLG → CHC May 26, 07:40 UTCMay 26, 08:24 UTC45m
2026-05-26 ANZ542 CHC → AKL May 26, 00:09 UTCMay 26, 01:10 UTC1h 0m
2026-05-25 ANZ644 ZQN → AKL May 25, 22:34 UTCMay 25, 23:14 UTC40m
2026-05-25 ANZ659 CHC → ZQN May 25, 20:50 UTCMay 25, 21:15 UTC25m
2026-05-25 ANZ327 WLG → CHC May 25, 19:05 UTCMay 25, 19:40 UTC35m
2026-05-25 ANZ457 AKL → WLG May 25, 08:15 UTCMay 25, 09:05 UTC50m
2026-05-25 ANZ626 ZQN → AKL May 25, 05:50 UTCMay 25, 07:10 UTC1h 20m
2026-05-25 ANZ623 AKL → ZQN May 25, 03:20 UTCMay 25, 04:40 UTC1h 20m
2026-05-24 ANZ686 DUD → WLG May 24, 23:15 UTCMay 24, 23:46 UTC31m
2026-05-24 ANZ681 WLG → DUD May 24, 21:35 UTCMay 24, 21:45 UTC10m
2026-05-24 ANZ332 CHC → WLG May 24, 19:55 UTCMay 24, 20:25 UTC30m
2026-05-24 ANZ325 HLZ → CHC May 24, 05:15 UTCMay 24, 06:20 UTC1h 5m
2026-05-24 ANZ324 CHC → HLZ May 24, 03:15 UTCMay 24, 04:10 UTC55m
2026-05-23 ANZ523 AKL → CHC May 23, 20:15 UTCMay 23, 21:25 UTC1h 10m
2026-05-23 ANZ582 CHC → AKL May 23, 17:55 UTCMay 23, 18:55 UTC1h 0m
2026-05-10 ANZ547 AKL → CHC May 10, 02:14 UTCMay 10, 03:30 UTC1h 15m
2026-05-09 ANZ538 CHC → AKL May 9, 23:44 UTCMay 10, 00:45 UTC1h 0m
2026-05-09 ANZ527 AKL → CHC May 9, 21:25 UTCMay 9, 22:34 UTC1h 10m
2026-05-09 ANZ574 CHC → AKL May 9, 08:15 UTCMay 9, 09:15 UTC1h 0m
2026-05-09 ANZ563 AKL → CHC May 9, 06:00 UTCMay 9, 07:10 UTC1h 10m
2026-05-09 ANZ550 CHC → AKL May 9, 02:10 UTCMay 9, 03:15 UTC1h 5m
2026-05-09 ANZ539 AKL → CHC May 9, 00:15 UTCMay 9, 01:20 UTC1h 5m
2026-05-08 ANZ548 CHC → AKL May 8, 22:00 UTCMay 8, 23:10 UTC1h 10m
2026-05-08 ANZ567 AKL → CHC May 8, 07:20 UTCMay 8, 08:24 UTC1h 5m
2026-05-08 ANZ560 CHC → AKL May 8, 05:00 UTCMay 8, 06:14 UTC1h 15m
2026-05-08 ANZ549 AKL → CHC May 8, 02:59 UTCMay 8, 04:04 UTC1h 5m
2026-05-08 ANZ542 CHC → AKL May 8, 00:20 UTCMay 8, 01:29 UTC1h 10m
2026-05-07 ANZ644 ZQN → AKL May 7, 22:54 UTCMay 7, 23:24 UTC30m
2026-05-07 ANZ659 CHC → ZQN May 7, 20:55 UTCMay 7, 21:40 UTC45m
2026-05-07 ANZ327 WLG → CHC May 7, 19:10 UTCMay 7, 19:50 UTC40m

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?
Yes. Mode-S C821C1 is currently airborne.
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 ANZ637, ANZ634, ANZ625, ANZ608, ANZ605.