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sensors Mode-S transponder

C81A43

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-JSD · CESSNA 172 Skyhawk

Hex
C81A43
Octal
62015103
Decimal
13,113,923
Country
NZ
Tail
ZK-JSD
Type
C172
No current signal · last broadcast Jul 24, 00:10 UTC
Flights observed
86
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 24, 00:10 UTC

Last known position

Most recent position reported by Mode-S C81A43.

Country allocation

The ICAO 24-bit address C81A43 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
ZKJSD - 86 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 ZKJSD - Jul 23, 23:20 UTCJul 24, 00:10 UTC50m
2026-07-23 ZKJSD - Jul 23, 02:55 UTCJul 23, 04:50 UTC1h 55m
2026-07-22 ZKJSD - Jul 22, 22:05 UTCJul 22, 23:40 UTC1h 35m
2026-07-21 ZKJSD - Jul 21, 03:55 UTCJul 21, 04:30 UTC35m
2026-07-21 ZKJSD NPE → NPE Jul 21, 02:00 UTCJul 21, 02:45 UTC45m
2026-07-20 ZKJSD NPE → NPE Jul 20, 23:55 UTCJul 21, 00:20 UTC25m
2026-07-20 ZKJSD - Jul 20, 21:45 UTCJul 20, 22:50 UTC1h 5m
2026-07-20 ZKJSD - Jul 20, 04:00 UTCJul 20, 04:40 UTC40m
2026-07-20 ZKJSD - Jul 20, 01:45 UTCJul 20, 02:40 UTC55m
2026-07-19 ZKJSD - Jul 19, 23:10 UTCJul 20, 00:00 UTC50m
2026-07-18 ZKJSD - Jul 18, 00:35 UTCJul 18, 02:50 UTC2h 16m
2026-07-17 ZKJSD - Jul 17, 21:15 UTCJul 17, 23:14 UTC2h 0m
2026-07-17 ZKJSD NPE → NPE Jul 17, 02:54 UTCJul 17, 03:10 UTC15m
2026-07-16 ZKJSD NPE → NPE Jul 16, 23:49 UTCJul 17, 00:20 UTC30m
2026-07-16 ZKJSD - Jul 16, 21:45 UTCJul 16, 22:55 UTC1h 10m
2026-07-15 ZKJSD - Jul 15, 02:30 UTCJul 15, 04:40 UTC2h 10m
2026-07-14 ZKJSD - Jul 14, 23:00 UTCJul 14, 23:55 UTC55m
2026-07-14 ZKJSD NPE → NPE Jul 14, 21:10 UTCJul 14, 21:50 UTC40m
2026-07-13 ZKJSD NPE → NPE Jul 13, 22:45 UTCJul 14, 00:15 UTC1h 30m
2026-07-07 ZKJSD NPE → NPE Jul 7, 21:00 UTCJul 7, 21:55 UTC55m
2026-07-07 ZKJSD - Jul 7, 01:40 UTCJul 7, 04:00 UTC2h 20m
2026-07-07 ZKJSD - Jul 7, 00:00 UTCJul 7, 00:30 UTC30m
2026-07-05 ZKJSD NPE → NPE Jul 5, 21:15 UTCJul 5, 21:50 UTC35m
2026-07-04 ZKJSD - Jul 4, 00:35 UTCJul 4, 01:35 UTC1h 0m
2026-07-03 ZKJSD NPL → NPE Jul 3, 03:15 UTCJul 3, 04:45 UTC1h 30m
2026-07-03 ZKJSD - Jul 3, 00:40 UTCJul 3, 02:45 UTC2h 5m
2026-07-02 ZKJSD NPE → NPE Jul 2, 22:45 UTCJul 2, 23:10 UTC25m
2026-07-02 ZKJSD NPE → NPE Jul 2, 21:10 UTCJul 2, 22:00 UTC50m
2026-07-02 ZKJSD - Jul 2, 03:45 UTCJul 2, 05:05 UTC1h 20m
2026-07-02 ZKJSD NPE → HLZ Jul 2, 01:20 UTCJul 2, 03:00 UTC1h 40m
2026-07-01 ZKJSD NPE → NPE Jul 1, 21:30 UTCJul 1, 21:55 UTC25m
2026-07-01 ZKJSD NPE → NPE Jul 1, 04:10 UTCJul 1, 04:50 UTC40m
2026-07-01 ZKJSD - Jul 1, 01:45 UTCJul 1, 03:05 UTC1h 20m
2026-06-30 ZKJSD - Jun 30, 23:00 UTCJul 1, 00:35 UTC1h 35m
2026-06-30 ZKJSD - Jun 30, 04:15 UTCJun 30, 04:35 UTC20m
2026-06-30 ZKJSD - Jun 30, 01:45 UTCJun 30, 02:10 UTC25m
2026-06-24 ZKJSD NPE → NPE Jun 24, 23:54 UTCJun 25, 00:24 UTC30m
2026-06-24 ZKJSD - Jun 24, 21:44 UTCJun 24, 22:29 UTC45m
2026-06-23 ZKJSD NPE → NPE Jun 23, 21:24 UTCJun 24, 00:25 UTC3h 0m
2026-06-23 ZKJSD - Jun 23, 01:40 UTCJun 23, 03:49 UTC2h 10m
2026-06-22 ZKJSD - Jun 22, 03:35 UTCJun 22, 04:00 UTC25m
2026-06-22 ZKJSD - Jun 22, 01:55 UTCJun 22, 02:14 UTC20m
2026-06-13 ZKJSD - Jun 13, 02:20 UTCJun 13, 03:15 UTC55m
2026-06-13 ZKJSD - Jun 13, 01:00 UTCJun 13, 01:45 UTC45m
2026-06-11 ZKJSD - Jun 11, 01:25 UTCJun 11, 02:30 UTC1h 5m
2026-06-10 ZKJSD NPE → NPE Jun 10, 22:05 UTCJun 10, 22:50 UTC45m
2026-06-03 ZKJSD - Jun 3, 23:00 UTCJun 3, 23:50 UTC50m
2026-06-03 ZKJSD NPE → NPE Jun 3, 21:00 UTCJun 3, 21:45 UTC45m
2026-06-03 ZKJSD - Jun 3, 03:45 UTCJun 3, 04:30 UTC45m
2026-06-03 ZKJSD - Jun 3, 01:35 UTCJun 3, 02:25 UTC50m

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

Mode-S C81A43 frequently asked

What is Mode-S code C81A43?
C81A43 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-JSD.
Where is Mode-S C81A43 registered?
Mode-S code C81A43 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 C81A43 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 00:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81A43, octal 62015103, decimal 13,113,923.
What flights does C81A43 operate?
Mode-S C81A43 has broadcast 1 distinct callsign, including ZKJSD.