Apparatus

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sensors Mode-S transponder

3C4439

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-AAAY · BOMBARDIER CL-600 Challenger

Hex
3C4439
Octal
17042071
Decimal
3,949,625
Country
DE
Tail
D-AAAY
Type
CL60
No current signal · last broadcast 16h ago
Flights observed
104
Distinct callsigns
1
Country
DE
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S 3C4439.

Country allocation

The ICAO 24-bit address 3C4439 falls within the block assigned to Germany (DE) by ICAO Annex 10, Volume III. Every aircraft registered in Germany 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
DAAAY - 104 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 DAAAY NCE → LBG Jul 17, 09:20 UTCJul 17, 10:30 UTC1h 10m
2026-07-16 DAAAY - Jul 16, 13:30 UTCJul 16, 13:49 UTC20m
2026-07-16 DAAAY - Jul 16, 09:15 UTCJul 16, 10:55 UTC1h 40m
2026-07-16 DAAAY OBF → BQH Jul 16, 05:45 UTCJul 16, 07:20 UTC1h 35m
2026-07-14 DAAAY - Jul 14, 14:30 UTCJul 14, 15:55 UTC1h 25m
2026-07-14 DAAAY - Jul 14, 11:55 UTCJul 14, 12:45 UTC50m
2026-07-14 DAAAY - Jul 14, 10:10 UTCJul 14, 10:45 UTC35m
2026-07-13 DAAAY - Jul 13, 12:55 UTCJul 13, 13:40 UTC45m
2026-07-12 DAAAY - Jul 12, 13:45 UTCJul 12, 14:50 UTC1h 5m
2026-07-12 DAAAY NCE → LBG Jul 12, 11:20 UTCJul 12, 12:30 UTC1h 10m
2026-07-11 DAAAY IBZ → NCE Jul 11, 19:10 UTCJul 11, 20:20 UTC1h 10m
2026-07-11 DAAAY OLB → IBZ Jul 11, 17:10 UTCJul 11, 18:30 UTC1h 20m
2026-07-10 DAAAY - Jul 10, 12:40 UTCJul 10, 14:35 UTC1h 55m
2026-07-10 DAAAY - Jul 10, 09:40 UTCJul 10, 10:20 UTC40m
2026-07-10 DAAAY BQH → LBG Jul 10, 06:40 UTCJul 10, 07:25 UTC45m
2026-07-09 DAAAY - Jul 9, 08:20 UTCJul 9, 09:00 UTC40m
2026-07-09 DAAAY - Jul 9, 06:40 UTCJul 9, 07:30 UTC50m
2026-07-08 DAAAY - Jul 8, 17:10 UTCJul 8, 18:00 UTC50m
2026-07-08 DAAAY - Jul 8, 14:50 UTCJul 8, 16:25 UTC1h 35m
2026-07-08 DAAAY - Jul 8, 12:00 UTCJul 8, 13:40 UTC1h 40m
2026-07-07 DAAAY - Jul 7, 16:20 UTCJul 7, 16:55 UTC35m
2026-07-07 DAAAY - Jul 7, 13:40 UTCJul 7, 14:50 UTC1h 10m
2026-07-06 DAAAY HAM → ZRH Jul 6, 08:55 UTCJul 6, 10:15 UTC1h 20m
2026-07-06 DAAAY - Jul 6, 06:15 UTCJul 6, 07:30 UTC1h 15m
2026-07-05 DAAAY - Jul 5, 14:00 UTCJul 5, 15:10 UTC1h 10m
2026-07-05 DAAAY - Jul 5, 11:00 UTCJul 5, 11:50 UTC50m
2026-07-05 DAAAY - Jul 5, 08:10 UTCJul 5, 08:50 UTC40m
2026-07-05 DAAAY - Jul 5, 05:45 UTCJul 5, 07:05 UTC1h 20m
2026-07-04 DAAAY OBF → CFE Jul 4, 10:30 UTCJul 4, 13:05 UTC2h 35m
2026-06-22 DAAAY LBG → OBF Jun 22, 05:44 UTCJun 22, 06:54 UTC1h 10m
2026-06-21 DAAAY - Jun 21, 10:09 UTCJun 21, 11:55 UTC1h 45m
2026-06-21 DAAAY - Jun 21, 07:34 UTCJun 21, 08:04 UTC30m
2026-06-19 DAAAY - Jun 19, 12:34 UTCJun 19, 12:59 UTC25m
2026-06-19 DAAAY - Jun 19, 10:44 UTCJun 19, 11:39 UTC55m
2026-06-18 DAAAY FCO → LIN Jun 18, 14:40 UTCJun 18, 15:35 UTC55m
2026-06-18 DAAAY LIN → FCO Jun 18, 09:15 UTCJun 18, 10:00 UTC45m
2026-06-17 DAAAY - Jun 17, 13:20 UTCJun 17, 13:40 UTC20m
2026-06-17 DAAAY - Jun 17, 11:25 UTCJun 17, 12:00 UTC35m
2026-06-17 DAAAY BER → NCE Jun 17, 07:10 UTCJun 17, 08:45 UTC1h 35m
2026-06-15 DAAAY - Jun 15, 13:15 UTCJun 15, 14:40 UTC1h 25m
2026-06-14 DAAAY LYN → LBG Jun 14, 12:05 UTCJun 14, 12:55 UTC50m
2026-06-13 DAAAY BER → LYN Jun 13, 10:20 UTCJun 13, 11:50 UTC1h 30m
2026-06-12 DAAAY - Jun 12, 16:10 UTCJun 12, 17:00 UTC50m
2026-06-11 DAAAY - Jun 11, 11:25 UTCJun 11, 14:05 UTC2h 40m
2026-06-09 DAAAY - Jun 9, 14:35 UTCJun 9, 18:00 UTC3h 25m
2026-06-09 DAAAY - Jun 9, 10:40 UTCJun 9, 12:25 UTC1h 45m
2026-06-08 DAAAY - Jun 8, 14:05 UTCJun 8, 14:55 UTC50m
2026-06-08 DAAAY NCE → LBG Jun 8, 09:55 UTCJun 8, 11:05 UTC1h 10m
2026-06-07 DAAAY NUE → NCE Jun 7, 19:30 UTCJun 7, 20:40 UTC1h 10m
2026-06-07 DAAAY - Jun 7, 14:25 UTCJun 7, 16:55 UTC2h 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 D-AAAY page for operator, model, and routing details .

Mode-S 3C4439 frequently asked

What is Mode-S code 3C4439?
3C4439 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AAAY.
Where is Mode-S 3C4439 registered?
Mode-S code 3C4439 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C4439 broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C4439, octal 17042071, decimal 3,949,625.
What flights does 3C4439 operate?
Mode-S 3C4439 has broadcast 1 distinct callsign, including DAAAY.