Apparatus

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sensors Mode-S transponder

C81CAE

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-RDW · B&F TECHNIK FK-9

Hex
C81CAE
Octal
62016256
Decimal
13,114,542
Country
NZ
Tail
ZK-RDW
Type
FK9
No current signal · last broadcast Jul 25, 02:10 UTC
Flights observed
43
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 25, 02:10 UTC

Last known position

Most recent position reported by Mode-S C81CAE.

Country allocation

The ICAO 24-bit address C81CAE 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 1 distinct

Callsign Airline Flights Last seen
ZKRDW - 43 2026-07-25

Recent flights last 43

DateFlightRouteTakeoffLandingDuration
2026-07-25 ZKRDW - Jul 25, 01:40 UTCJul 25, 02:10 UTC30m
2026-07-25 ZKRDW - Jul 25, 01:10 UTCJul 25, 01:30 UTC20m
2026-07-18 ZKRDW - Jul 18, 00:29 UTCJul 18, 01:45 UTC1h 15m
2026-07-17 ZKRDW - Jul 17, 23:00 UTCJul 17, 23:05 UTC5m
2026-07-12 ZKRDW - Jul 12, 03:01 UTCJul 12, 03:15 UTC14m
2026-07-12 ZKRDW - Jul 12, 00:45 UTCJul 12, 01:05 UTC20m
2026-07-11 ZKRDW - Jul 11, 01:45 UTCJul 11, 02:20 UTC35m
2026-07-11 ZKRDW - Jul 11, 00:10 UTCJul 11, 00:50 UTC40m
2026-07-10 ZKRDW - Jul 10, 00:15 UTCJul 10, 00:25 UTC10m
2026-07-05 ZKRDW - Jul 5, 01:35 UTCJul 5, 01:45 UTC10m
2026-07-04 ZKRDW - Jul 4, 23:45 UTCJul 5, 00:05 UTC20m
2026-07-04 ZKRDW - Jul 4, 01:35 UTCJul 4, 02:15 UTC40m
2026-07-04 ZKRDW - Jul 4, 00:45 UTCJul 4, 00:55 UTC10m
2026-07-03 ZKRDW - Jul 3, 22:55 UTCJul 3, 23:20 UTC25m
2026-06-28 ZKRDW - Jun 28, 02:05 UTCJun 28, 02:14 UTC10m
2026-06-28 ZKRDW - Jun 28, 00:35 UTCJun 28, 01:10 UTC35m
2026-06-27 ZKRDW - Jun 27, 00:00 UTCJun 27, 00:14 UTC15m
2026-06-26 ZKRDW - Jun 26, 23:15 UTCJun 26, 23:25 UTC10m
2026-06-20 ZKRDW - Jun 20, 02:00 UTCJun 20, 03:54 UTC1h 55m
2026-06-14 ZKRDW - Jun 14, 01:25 UTCJun 14, 01:40 UTC15m
2026-06-14 ZKRDW - Jun 14, 00:55 UTCJun 14, 01:05 UTC10m
2026-06-13 ZKRDW - Jun 13, 00:50 UTCJun 13, 04:30 UTC3h 39m
2026-06-07 ZKRDW - Jun 7, 02:10 UTCJun 7, 02:50 UTC40m
2026-06-07 ZKRDW - Jun 7, 00:55 UTCJun 7, 01:45 UTC50m
2026-06-06 ZKRDW - Jun 6, 23:19 UTCJun 7, 00:34 UTC1h 15m
2026-05-30 ZKRDW - May 30, 01:15 UTCMay 30, 02:25 UTC1h 10m
2026-05-29 ZKRDW - May 29, 23:35 UTCMay 30, 00:05 UTC30m
2026-05-24 ZKRDW - May 24, 02:05 UTCMay 24, 02:15 UTC10m
2026-05-17 ZKRDW - May 17, 01:00 UTCMay 17, 02:45 UTC1h 45m
2026-05-16 ZKRDW - May 16, 01:30 UTCMay 16, 02:50 UTC1h 20m
2026-05-09 ZKRDW - May 9, 23:05 UTCMay 9, 23:20 UTC15m
2026-05-03 ZKRDW - May 3, 02:45 UTCMay 3, 03:20 UTC35m
2026-05-03 ZKRDW - May 3, 02:00 UTCMay 3, 02:10 UTC10m
2026-05-03 ZKRDW - May 3, 00:20 UTCMay 3, 00:30 UTC10m
2026-05-02 ZKRDW - May 2, 03:25 UTCMay 2, 03:45 UTC20m
2026-05-02 ZKRDW - May 2, 02:35 UTCMay 2, 02:45 UTC10m
2026-05-02 ZKRDW - May 2, 01:05 UTCMay 2, 01:35 UTC30m
2026-04-26 ZKRDW - Apr 26, 01:40 UTCApr 26, 01:50 UTC10m
2026-04-26 ZKRDW - Apr 26, 00:55 UTCApr 26, 01:05 UTC10m
2026-04-25 ZKRDW - Apr 25, 00:05 UTCApr 25, 04:05 UTC4h 0m
2026-04-19 ZKRDW - Apr 19, 01:20 UTCApr 19, 02:40 UTC1h 20m
2026-04-19 ZKRDW - Apr 19, 00:00 UTCApr 19, 00:10 UTC10m
2026-04-17 ZKRDW - Apr 17, 23:55 UTCApr 18, 00:10 UTC15m

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

Mode-S C81CAE frequently asked

What is Mode-S code C81CAE?
C81CAE is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-RDW.
Where is Mode-S C81CAE registered?
Mode-S code C81CAE 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 C81CAE broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 02:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81CAE, octal 62016256, decimal 13,114,542.
What flights does C81CAE operate?
Mode-S C81CAE has broadcast 1 distinct callsign, including ZKRDW.