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sensors Mode-S transponder

C81D25

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-FDR · BEECH 200 Super King Air

Hex
C81D25
Octal
62016445
Decimal
13,114,661
Country
NZ
Tail
ZK-FDR
Type
BE20
No current signal · last broadcast Jul 25, 23:55 UTC
Flights observed
147
Distinct callsigns
3
Country
NZ
Last broadcast
Jul 25, 23:55 UTC

Last known position

Most recent position reported by Mode-S C81D25.

Country allocation

The ICAO 24-bit address C81D25 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 3 distinct

Callsign Airline Flights Last seen
FDC12 - 126 2026-07-25
FDC22 - 20 2026-07-02
ZKFDR - 1 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 FDC12 - Jul 25, 23:40 UTCJul 25, 23:55 UTC15m
2026-07-25 FDC12 - Jul 25, 21:40 UTCJul 25, 22:00 UTC20m
2026-07-25 FDC12 - Jul 25, 03:15 UTCJul 25, 03:35 UTC20m
2026-07-25 FDC12 - Jul 25, 00:50 UTCJul 25, 02:00 UTC1h 10m
2026-07-24 FDC12 - Jul 24, 22:30 UTCJul 24, 22:45 UTC15m
2026-07-24 FDC12 - Jul 24, 02:15 UTCJul 24, 03:50 UTC1h 35m
2026-07-23 FDC12 - Jul 23, 22:20 UTCJul 24, 00:15 UTC1h 55m
2026-07-23 FDC12 - Jul 23, 08:45 UTCJul 23, 09:30 UTC45m
2026-07-23 FDC12 - Jul 23, 06:30 UTCJul 23, 07:20 UTC50m
2026-07-23 FDC12 - Jul 23, 04:00 UTCJul 23, 04:15 UTC15m
2026-07-23 FDC12 - Jul 23, 02:05 UTCJul 23, 02:25 UTC20m
2026-07-22 FDC12 BHE → CHC Jul 22, 12:00 UTCJul 22, 12:50 UTC50m
2026-07-22 FDC12 - Jul 22, 02:20 UTCJul 22, 04:55 UTC2h 35m
2026-07-21 FDC12 - Jul 21, 22:30 UTCJul 22, 00:20 UTC1h 50m
2026-07-14 FDC12 - Jul 14, 22:30 UTCJul 15, 00:20 UTC1h 49m
2026-07-12 FDC12 - Jul 12, 03:10 UTCJul 12, 03:35 UTC25m
2026-07-12 FDC12 - Jul 12, 01:50 UTCJul 12, 02:20 UTC30m
2026-07-02 ZKFDR - Jul 2, 05:55 UTCJul 2, 06:41 UTC46m
2026-07-02 FDC22 - Jul 2, 04:10 UTCJul 2, 04:30 UTC20m
2026-07-02 FDC22 - Jul 2, 02:25 UTCJul 2, 02:40 UTC15m
2026-07-02 FDC22 - Jul 2, 00:55 UTCJul 2, 01:20 UTC25m
2026-07-01 FDC22 - Jul 1, 22:40 UTCJul 1, 23:10 UTC30m
2026-07-01 FDC22 - Jul 1, 04:50 UTCJul 1, 05:05 UTC15m
2026-07-01 FDC22 - Jul 1, 01:45 UTCJul 1, 03:05 UTC1h 20m
2026-07-01 FDC22 - Jul 1, 00:40 UTCJul 1, 00:55 UTC15m
2026-06-30 FDC22 - Jun 30, 23:05 UTCJun 30, 23:25 UTC20m
2026-06-30 FDC22 - Jun 30, 01:00 UTCJun 30, 01:09 UTC10m
2026-06-29 FDC22 - Jun 29, 02:45 UTCJun 29, 03:20 UTC35m
2026-06-28 FDC12 - Jun 28, 19:44 UTCJun 28, 21:14 UTC1h 30m
2026-06-28 FDC12 - Jun 28, 02:05 UTCJun 28, 02:20 UTC15m
2026-06-28 FDC12 - Jun 28, 00:35 UTCJun 28, 00:50 UTC15m
2026-06-27 FDC12 - Jun 27, 19:09 UTCJun 27, 19:29 UTC20m
2026-06-27 FDC12 - Jun 27, 15:14 UTCJun 27, 15:34 UTC20m
2026-06-25 FDC12 - Jun 25, 02:45 UTCJun 25, 03:24 UTC40m
2026-06-25 FDC12 - Jun 25, 01:09 UTCJun 25, 01:24 UTC15m
2026-06-24 FDC12 - Jun 24, 23:50 UTCJun 25, 00:09 UTC20m
2026-06-24 FDC12 - Jun 24, 21:34 UTCJun 24, 21:54 UTC20m
2026-06-24 FDC12 - Jun 24, 07:30 UTCJun 24, 07:50 UTC20m
2026-06-24 FDC12 - Jun 24, 06:10 UTCJun 24, 06:50 UTC40m
2026-06-24 FDC12 - Jun 24, 02:09 UTCJun 24, 03:44 UTC1h 35m
2026-06-23 FDC12 - Jun 23, 23:34 UTCJun 24, 00:25 UTC50m
2026-06-23 FDC12 - Jun 23, 22:29 UTCJun 23, 22:49 UTC20m
2026-06-23 FDC12 - Jun 23, 20:54 UTCJun 23, 21:14 UTC20m
2026-06-23 FDC12 - Jun 23, 02:20 UTCJun 23, 02:29 UTC10m
2026-06-23 FDC12 - Jun 23, 00:54 UTCJun 23, 01:35 UTC40m
2026-06-22 FDC12 - Jun 22, 21:14 UTCJun 22, 22:59 UTC1h 45m
2026-06-21 FDC12 - Jun 21, 01:49 UTCJun 21, 02:10 UTC20m
2026-06-21 FDC12 - Jun 21, 00:10 UTCJun 21, 00:29 UTC20m
2026-06-20 FDC12 - Jun 20, 09:24 UTCJun 20, 09:39 UTC15m
2026-06-20 FDC12 - Jun 20, 05:39 UTCJun 20, 05:49 UTC10m

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

Mode-S C81D25 frequently asked

What is Mode-S code C81D25?
C81D25 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-FDR.
Where is Mode-S C81D25 registered?
Mode-S code C81D25 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 C81D25 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 23:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81D25, octal 62016445, decimal 13,114,661.
What flights does C81D25 operate?
Mode-S C81D25 has broadcast 3 distinct callsigns, including FDC12, FDC22, ZKFDR.