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sensors Mode-S transponder

3C66A4

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-AIUD · AIRBUS A-320

Hex
3C66A4
Octal
17063244
Decimal
3,958,436
Country
DE
Tail
D-AIUD
Type
A320
No current signal · last broadcast 54m ago
Flights observed
557
Distinct callsigns
20
Country
DE
Last broadcast
54m ago

Last known position

Most recent position reported by Mode-S 3C66A4.

Country allocation

The ICAO 24-bit address 3C66A4 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 20 distinct

Callsign Airline Flights Last seen
DLH69H - 8 2026-07-11
DLH4UV - 8 2026-07-05
DLH4T - 8 2026-07-04
DLH33P - 8 2026-07-03
DLH93U - 7 2026-07-04
DLH4JA - 7 2026-07-15
DLH3NC - 7 2026-07-15
DLH05Y - 7 2026-07-11
DLH9XC - 6 2026-07-02
DLH99H - 6 2026-07-07
DLH6CJ - 6 2026-07-02
DLH06H - 6 2026-07-07
DLH8VC - 5 2026-07-10
DLH8PN Lufthansa 5 2026-06-10
DLH7FM Lufthansa 5 2026-06-15
DLH5UW Lufthansa 5 2026-06-10
DLH5HV Lufthansa 5 2026-05-16
DLH4LY - 5 2026-06-16
DLH4KX Lufthansa 5 2026-06-15
DLH1LY - 5 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 DLH02P - Jul 17, 20:50 UTCJul 17, 22:35 UTC1h 45m
2026-07-17 DLH8AJ PMO → MUC Jul 17, 16:55 UTCJul 17, 18:34 UTC1h 40m
2026-07-17 DLH3YJ - Jul 17, 14:10 UTCJul 17, 15:49 UTC1h 40m
2026-07-17 DLH57P - Jul 17, 10:25 UTCJul 17, 12:15 UTC1h 50m
2026-07-17 DLH95N - Jul 17, 06:35 UTCJul 17, 08:49 UTC2h 15m
2026-07-16 DLH6AN - Jul 16, 18:05 UTCJul 16, 18:55 UTC50m
2026-07-16 DLH4HX - Jul 16, 16:25 UTCJul 16, 17:14 UTC50m
2026-07-16 DLH3FN - Jul 16, 13:30 UTCJul 16, 15:19 UTC1h 50m
2026-07-16 DLH8XM - Jul 16, 10:40 UTCJul 16, 12:30 UTC1h 50m
2026-07-16 DLH4RV DUS → MUC Jul 16, 08:25 UTCJul 16, 09:15 UTC50m
2026-07-16 DLH2TY - Jul 16, 06:30 UTCJul 16, 07:20 UTC50m
2026-07-16 DLH1KV - Jul 16, 03:15 UTCJul 16, 04:55 UTC1h 40m
2026-07-15 DLH1CK - Jul 15, 19:35 UTCJul 15, 21:00 UTC1h 25m
2026-07-15 DLH08X - Jul 15, 17:25 UTCJul 15, 18:30 UTC1h 5m
2026-07-15 DLH16A - Jul 15, 14:20 UTCJul 15, 15:40 UTC1h 20m
2026-07-15 DLH3NC - Jul 15, 11:20 UTCJul 15, 13:00 UTC1h 40m
2026-07-15 DLH4JA - Jul 15, 07:40 UTCJul 15, 09:10 UTC1h 30m
2026-07-15 DLH01J - Jul 15, 04:20 UTCJul 15, 05:35 UTC1h 15m
2026-07-14 DLH92A - Jul 14, 18:15 UTCJul 14, 19:30 UTC1h 15m
2026-07-14 DLH5AH - Jul 14, 15:50 UTCJul 14, 16:50 UTC1h 0m
2026-07-14 DLH6JF - Jul 14, 13:10 UTCJul 14, 14:15 UTC1h 5m
2026-07-14 DLH2013 DUS → MUC Jul 14, 10:50 UTCJul 14, 11:40 UTC50m
2026-07-14 DLH2012 MUC → DUS Jul 14, 08:50 UTCJul 14, 09:45 UTC55m
2026-07-14 DLH4HF CGN → MUC Jul 14, 06:50 UTCJul 14, 07:30 UTC40m
2026-07-14 DLH8VV - Jul 14, 04:50 UTCJul 14, 05:40 UTC50m
2026-07-13 DLH7E HAM → MUC Jul 13, 16:55 UTCJul 13, 17:50 UTC55m
2026-07-13 DLH2HL MUC → HAM Jul 13, 14:55 UTCJul 13, 15:50 UTC55m
2026-07-13 DLH66J - Jul 13, 12:00 UTCJul 13, 13:30 UTC1h 30m
2026-07-13 DLH09Y MUC → BCN Jul 13, 08:45 UTCJul 13, 10:35 UTC1h 50m
2026-07-13 DLH99P - Jul 13, 05:31 UTCJul 13, 07:05 UTC1h 35m
2026-07-12 DLH02P - Jul 12, 19:25 UTCJul 12, 21:15 UTC1h 50m
2026-07-12 DLH3NF SKG → MUC Jul 12, 16:20 UTCJul 12, 18:10 UTC1h 50m
2026-07-12 DLH1VT WRO → FRA Jul 12, 13:35 UTCJul 12, 15:15 UTC1h 40m
2026-07-12 DLH2MF - Jul 12, 10:35 UTCJul 12, 12:20 UTC1h 45m
2026-07-12 DLH7PW - Jul 12, 07:50 UTCJul 12, 09:10 UTC1h 20m
2026-07-11 DLH69H ALC → MUC Jul 11, 16:55 UTCJul 11, 18:55 UTC2h 0m
2026-07-11 DLH05Y MUC → ALC Jul 11, 13:15 UTCJul 11, 15:50 UTC2h 35m
2026-07-11 DLH3NC - Jul 11, 10:05 UTCJul 11, 11:55 UTC1h 50m
2026-07-11 DLH4JA - Jul 11, 07:15 UTCJul 11, 08:50 UTC1h 35m
2026-07-11 DLH7LA DUS → MUC Jul 11, 04:40 UTCJul 11, 05:25 UTC45m
2026-07-10 DLH3LR MUC → DUS Jul 10, 19:35 UTCJul 10, 20:25 UTC50m
2026-07-10 DLH1LY - Jul 10, 16:45 UTCJul 10, 18:40 UTC1h 55m
2026-07-10 DLH8VC - Jul 10, 14:25 UTCJul 10, 15:50 UTC1h 25m
2026-07-10 DLH1ME - Jul 10, 12:00 UTCJul 10, 12:50 UTC50m
2026-07-10 DLH1PJ - Jul 10, 10:05 UTCJul 10, 10:45 UTC40m
2026-07-10 DLH6AC BUD → MUC Jul 10, 07:30 UTCJul 10, 08:30 UTC1h 0m
2026-07-10 DLH5JW MUC → BUD Jul 10, 05:30 UTCJul 10, 06:25 UTC55m
2026-07-09 DLH8KM - Jul 9, 17:35 UTCJul 9, 19:05 UTC1h 30m
2026-07-09 DLH6RF - Jul 9, 14:40 UTCJul 9, 16:20 UTC1h 40m
2026-07-09 DLH97J - Jul 9, 12:20 UTCJul 9, 13:35 UTC1h 15m

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

Mode-S 3C66A4 frequently asked

What is Mode-S code 3C66A4?
3C66A4 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AIUD.
Where is Mode-S 3C66A4 registered?
Mode-S code 3C66A4 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C66A4 broadcasting right now?
No active broadcast right now. Last signal was 54m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C66A4, octal 17063244, decimal 3,958,436.
What flights does 3C66A4 operate?
Mode-S 3C66A4 has broadcast 20 distinct callsigns, including DLH69H, DLH4UV, DLH4T, DLH33P, DLH93U.