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sensors Mode-S transponder

C81C56

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-LJD · PIPER PA-28-140/150/160/180

Hex
C81C56
Octal
62016126
Decimal
13,114,454
Country
NZ
Tail
ZK-LJD
Type
P28A
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
280
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S C81C56.

Country allocation

The ICAO 24-bit address C81C56 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
ZKLJD - 280 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ZKLJD - Jul 26, 20:50 UTCJul 26, 21:30 UTC40m
2026-07-26 ZKLJD - Jul 26, 00:15 UTCJul 26, 03:10 UTC2h 55m
2026-07-25 ZKLJD - Jul 25, 22:35 UTCJul 25, 23:40 UTC1h 5m
2026-07-25 ZKLJD CHC → CHC Jul 25, 20:55 UTCJul 25, 21:55 UTC1h 0m
2026-07-25 ZKLJD - Jul 25, 01:35 UTCJul 25, 02:20 UTC45m
2026-07-24 ZKLJD CHC → CHC Jul 24, 03:25 UTCJul 24, 04:25 UTC1h 0m
2026-07-23 ZKLJD CHC → CHC Jul 23, 23:15 UTCJul 24, 00:30 UTC1h 15m
2026-07-23 ZKLJD - Jul 23, 20:35 UTCJul 23, 21:40 UTC1h 5m
2026-07-23 ZKLJD - Jul 23, 03:40 UTCJul 23, 05:00 UTC1h 20m
2026-07-23 ZKLJD - Jul 23, 01:40 UTCJul 23, 02:55 UTC1h 15m
2026-07-22 ZKLJD CHC → CHC Jul 22, 23:30 UTCJul 23, 00:45 UTC1h 15m
2026-07-22 ZKLJD - Jul 22, 20:15 UTCJul 22, 21:45 UTC1h 30m
2026-07-22 ZKLJD - Jul 22, 03:25 UTCJul 22, 04:45 UTC1h 20m
2026-07-22 ZKLJD - Jul 22, 01:00 UTCJul 22, 02:45 UTC1h 45m
2026-07-21 ZKLJD - Jul 21, 22:40 UTCJul 21, 23:30 UTC50m
2026-07-21 ZKLJD - Jul 21, 20:35 UTCJul 21, 21:45 UTC1h 10m
2026-07-21 ZKLJD - Jul 21, 06:45 UTCJul 21, 08:30 UTC1h 45m
2026-07-21 ZKLJD - Jul 21, 03:20 UTCJul 21, 04:35 UTC1h 15m
2026-07-21 ZKLJD - Jul 21, 01:20 UTCJul 21, 02:30 UTC1h 10m
2026-07-20 ZKLJD - Jul 20, 22:35 UTCJul 20, 23:35 UTC1h 0m
2026-07-20 ZKLJD - Jul 20, 08:25 UTCJul 20, 09:35 UTC1h 10m
2026-07-20 ZKLJD - Jul 20, 06:30 UTCJul 20, 07:50 UTC1h 20m
2026-07-20 ZKLJD - Jul 20, 03:20 UTCJul 20, 05:00 UTC1h 40m
2026-07-20 ZKLJD CHC → CHC Jul 20, 01:40 UTCJul 20, 02:40 UTC1h 0m
2026-07-19 ZKLJD - Jul 19, 22:10 UTCJul 19, 23:55 UTC1h 45m
2026-07-17 ZKLJD - Jul 17, 22:25 UTCJul 17, 23:39 UTC1h 15m
2026-07-17 ZKLJD - Jul 17, 20:44 UTCJul 17, 21:25 UTC40m
2026-07-17 ZKLJD - Jul 17, 03:25 UTCJul 17, 04:49 UTC1h 25m
2026-07-17 ZKLJD - Jul 17, 01:15 UTCJul 17, 02:54 UTC1h 40m
2026-07-16 ZKLJD - Jul 16, 20:39 UTCJul 16, 21:55 UTC1h 15m
2026-07-16 ZKLJD CHC → CHC Jul 16, 08:20 UTCJul 16, 09:20 UTC1h 0m
2026-07-16 ZKLJD CHC → CHC Jul 16, 03:15 UTCJul 16, 04:15 UTC1h 0m
2026-07-16 ZKLJD - Jul 16, 01:30 UTCJul 16, 02:25 UTC55m
2026-07-15 ZKLJD CHC → CHC Jul 15, 22:25 UTCJul 15, 23:40 UTC1h 15m
2026-07-15 ZKLJD CHC → CHC Jul 15, 20:35 UTCJul 15, 21:45 UTC1h 10m
2026-07-15 ZKLJD - Jul 15, 06:50 UTCJul 15, 08:00 UTC1h 10m
2026-07-15 ZKLJD - Jul 15, 03:35 UTCJul 15, 04:40 UTC1h 5m
2026-07-15 ZKLJD - Jul 15, 00:50 UTCJul 15, 02:45 UTC1h 55m
2026-07-14 ZKLJD - Jul 14, 22:40 UTCJul 14, 23:45 UTC1h 4m
2026-07-14 ZKLJD - Jul 14, 20:40 UTCJul 14, 21:45 UTC1h 5m
2026-07-14 ZKLJD - Jul 14, 06:40 UTCJul 14, 08:00 UTC1h 20m
2026-07-14 ZKLJD - Jul 14, 01:40 UTCJul 14, 02:40 UTC1h 0m
2026-07-13 ZKLJD - Jul 13, 22:35 UTCJul 13, 23:25 UTC50m
2026-07-13 ZKLJD - Jul 13, 20:50 UTCJul 13, 21:40 UTC50m
2026-07-13 ZKLJD CHC → CHC Jul 13, 03:40 UTCJul 13, 04:40 UTC1h 0m
2026-07-13 ZKLJD CHC → CHC Jul 13, 01:25 UTCJul 13, 02:15 UTC50m
2026-07-12 ZKLJD - Jul 12, 23:20 UTCJul 13, 00:01 UTC40m
2026-07-12 ZKLJD CHC → CHC Jul 12, 21:00 UTCJul 12, 22:25 UTC1h 25m
2026-07-12 ZKLJD - Jul 12, 04:15 UTCJul 12, 04:25 UTC10m
2026-07-12 ZKLJD - Jul 12, 00:50 UTCJul 12, 02:20 UTC1h 30m

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

Mode-S C81C56 frequently asked

What is Mode-S code C81C56?
C81C56 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-LJD.
Where is Mode-S C81C56 registered?
Mode-S code C81C56 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 C81C56 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81C56, octal 62016126, decimal 13,114,454.
What flights does C81C56 operate?
Mode-S C81C56 has broadcast 1 distinct callsign, including ZKLJD.