Apparatus

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sensors Mode-S transponder

3C66B9

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-AIUY · AIRBUS A-320

Hex
3C66B9
Octal
17063271
Decimal
3,958,457
Country
DE
Tail
D-AIUY
Type
A320
No current signal · last broadcast 2h ago
Flights observed
291
Distinct callsigns
20
Country
DE
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 3C66B9.

Country allocation

The ICAO 24-bit address 3C66B9 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
OCN8FE - 15 2026-07-02
OCN4WJ - 15 2026-07-02
OCN803 - 14 2026-07-13
OCN5SG - 12 2026-07-13
OCN6HP O Air 10 2026-07-14
OCN8FC O Air 9 2026-07-14
OCN5AN O Air 9 2026-06-12
OCN9DY - 8 2026-06-12
OCN5MC - 8 2026-06-20
OCN2B O Air 8 2026-06-20
OCN9ZF - 7 2026-07-08
OCN6NH O Air 7 2026-07-10
OCN515 - 7 2026-07-10
OCN4ES - 7 2026-07-08
OCN4EK - 5 2026-07-01
OCN2WK - 5 2026-07-01
OCN8NT - 4 2026-07-09
OCN7YZ - 4 2026-06-06
OCN6GP O Air 4 2026-06-17
OCN4TC - 4 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 OCN8FC JTR → FRA Jul 14, 15:05 UTCJul 14, 16:15 UTC1h 10m
2026-07-14 OCN6HP FRA → JTR Jul 14, 11:20 UTCJul 14, 13:40 UTC2h 20m
2026-07-13 OCN803 - Jul 13, 18:25 UTCJul 13, 20:25 UTC2h 0m
2026-07-13 OCN5SG - Jul 13, 15:50 UTCJul 13, 17:25 UTC1h 35m
2026-07-13 OCN6JG - Jul 13, 11:25 UTCJul 13, 14:00 UTC2h 35m
2026-07-13 OCN3TY - Jul 13, 07:30 UTCJul 13, 10:10 UTC2h 40m
2026-07-12 OCN803 - Jul 12, 16:01 UTCJul 12, 17:45 UTC1h 45m
2026-07-12 OCN5SG - Jul 12, 12:55 UTCJul 12, 14:25 UTC1h 30m
2026-07-12 OCN6QV EFL → FRA Jul 12, 08:25 UTCJul 12, 10:50 UTC2h 25m
2026-07-12 OCN39T FRA → EFL Jul 12, 05:15 UTCJul 12, 07:25 UTC2h 10m
2026-07-11 OCN1343 - Jul 11, 14:10 UTCJul 11, 16:55 UTC2h 45m
2026-07-11 OCN3GB FRA → BOO Jul 11, 10:05 UTCJul 11, 12:45 UTC2h 40m
2026-07-11 OCN2057 PMI → FRA Jul 11, 07:00 UTCJul 11, 08:50 UTC1h 50m
2026-07-11 OCN2056 - Jul 11, 04:01 UTCJul 11, 05:50 UTC1h 50m
2026-07-10 OCN515 - Jul 10, 18:00 UTCJul 10, 19:45 UTC1h 45m
2026-07-10 OCN6NH PMI → MUC Jul 10, 15:15 UTCJul 10, 16:55 UTC1h 40m
2026-07-10 OCN2DE XRY → FRA Jul 10, 11:15 UTCJul 10, 13:45 UTC2h 30m
2026-07-10 OCN3RB FRA → XRY Jul 10, 07:10 UTCJul 10, 09:40 UTC2h 30m
2026-07-09 OCN3EL - Jul 9, 16:10 UTCJul 9, 20:05 UTC3h 55m
2026-07-09 OCN8NT - Jul 9, 10:25 UTCJul 9, 14:40 UTC4h 15m
2026-07-09 OCN2415 - Jul 9, 07:50 UTCJul 9, 09:05 UTC1h 15m
2026-07-09 OCN2414 - Jul 9, 05:05 UTCJul 9, 06:25 UTC1h 20m
2026-07-08 OCN517 PMI → FRA Jul 8, 15:20 UTCJul 8, 17:15 UTC1h 55m
2026-07-08 OCN1EJ FRA → PMI Jul 8, 12:30 UTCJul 8, 14:10 UTC1h 40m
2026-07-08 OCN4ES - Jul 8, 07:00 UTCJul 8, 09:55 UTC2h 55m
2026-07-08 OCN9ZF - Jul 8, 03:05 UTCJul 8, 05:35 UTC2h 30m
2026-07-07 OCN1343 - Jul 7, 11:55 UTCJul 7, 14:20 UTC2h 25m
2026-07-07 OCN3GB - Jul 7, 08:10 UTCJul 7, 10:55 UTC2h 45m
2026-07-06 OCN8FC JTR → FRA Jul 6, 11:35 UTCJul 6, 14:25 UTC2h 50m
2026-07-06 OCN6HP FRA → JTR Jul 6, 07:35 UTCJul 6, 10:00 UTC2h 25m
2026-07-05 OCN301 - Jul 5, 16:35 UTCJul 5, 20:35 UTC4h 0m
2026-07-05 OCN1CF FRA → FUE Jul 5, 11:35 UTCJul 5, 15:30 UTC3h 55m
2026-07-05 OCN34D - Jul 5, 06:50 UTCJul 5, 09:15 UTC2h 25m
2026-07-05 OCN1408 - Jul 5, 03:15 UTCJul 5, 05:15 UTC2h 0m
2026-07-04 OCN515 - Jul 4, 18:50 UTCJul 4, 20:40 UTC1h 50m
2026-07-04 OCN6NH PMI → MUC Jul 4, 15:50 UTCJul 4, 17:40 UTC1h 50m
2026-07-04 OCN537 MAH → FRA Jul 4, 12:20 UTCJul 4, 14:10 UTC1h 50m
2026-07-04 OCN9PG FRA → MAH Jul 4, 09:20 UTCJul 4, 11:10 UTC1h 50m
2026-07-04 OCN803 - Jul 4, 05:50 UTCJul 4, 07:40 UTC1h 50m
2026-07-04 OCN5SG - Jul 4, 03:00 UTCJul 4, 04:45 UTC1h 45m
2026-07-03 OCN6JG - Jul 3, 11:25 UTCJul 3, 14:05 UTC2h 40m
2026-07-03 OCN3TY - Jul 3, 07:15 UTCJul 3, 09:45 UTC2h 30m
2026-07-02 OCN515 - Jul 2, 18:15 UTCJul 2, 20:05 UTC1h 50m
2026-07-02 OCN6NH PMI → MUC Jul 2, 15:20 UTCJul 2, 17:00 UTC1h 40m
2026-07-02 OCN8FE - Jul 2, 11:35 UTCJul 2, 13:30 UTC1h 55m
2026-07-02 OCN4WJ - Jul 2, 08:45 UTCJul 2, 10:25 UTC1h 40m
2026-07-02 OCN1001 MUC → FRA Jul 2, 06:51 UTCJul 2, 07:30 UTC39m
2026-07-02 OCN1000 FRA → MUC Jul 2, 05:05 UTCJul 2, 05:50 UTC45m
2026-07-01 OCN2WK - Jul 1, 18:30 UTCJul 1, 19:50 UTC1h 20m
2026-07-01 OCN4EK - Jul 1, 15:30 UTCJul 1, 16:45 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-AIUY page for operator, model, and routing details .

Mode-S 3C66B9 frequently asked

What is Mode-S code 3C66B9?
3C66B9 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AIUY.
Where is Mode-S 3C66B9 registered?
Mode-S code 3C66B9 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C66B9 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C66B9, octal 17063271, decimal 3,958,457.
What flights does 3C66B9 operate?
Mode-S 3C66B9 has broadcast 20 distinct callsigns, including OCN8FE, OCN4WJ, OCN803, OCN5SG, OCN6HP.