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
Broadcasting now · callsign OCN4XK · 36,000 ft
Flights observed
339
Distinct callsigns
20
Country
DE
Last broadcast
Jul 26, 19:00 UTC

Current position

3C66B9 is currently broadcasting. Map zoomed to live position.

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
OCN803 O Air 17 2026-07-25
OCN8FE - 16 2026-07-19
OCN4WJ O Air 16 2026-07-19
OCN5SG - 15 2026-07-25
OCN6HP O Air 10 2026-07-14
OCN8FC O Air 9 2026-07-14
OCN6NH O Air 9 2026-07-25
OCN5AN O Air 9 2026-06-12
OCN515 O Air 9 2026-07-25
OCN9DY - 8 2026-06-12
OCN5MC - 8 2026-06-20
OCN2B O Air 8 2026-06-20
OCN9ZF - 7 2026-07-08
OCN4ES - 7 2026-07-08
OCN4EK - 7 2026-07-26
OCN2WK - 7 2026-07-26
OCN7YZ - 6 2026-07-20
OCN3ME O Air 6 2026-07-20
OCN34D - 6 2026-07-18
OCN2JV - 6 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 OCN2WK - Jul 26, 17:30 UTCJul 26, 18:55 UTC1h 25m
2026-07-26 OCN4EK - Jul 26, 14:50 UTCJul 26, 15:55 UTC1h 5m
2026-07-26 OCN7KN ZTH → FRA Jul 26, 09:35 UTCJul 26, 12:05 UTC2h 30m
2026-07-26 OCN1214 FRA → ZTH Jul 26, 06:15 UTCJul 26, 08:25 UTC2h 11m
2026-07-25 OCN515 PMI → FRA Jul 25, 19:55 UTCJul 25, 21:40 UTC1h 45m
2026-07-25 OCN6NH PMI → MUC Jul 25, 16:55 UTCJul 25, 18:50 UTC1h 55m
2026-07-25 OCN537 MAH → FRA Jul 25, 13:50 UTCJul 25, 15:30 UTC1h 40m
2026-07-25 OCN9PG FRA → MAH Jul 25, 09:55 UTCJul 25, 11:35 UTC1h 40m
2026-07-25 OCN803 BRI → FRA Jul 25, 05:50 UTCJul 25, 07:35 UTC1h 45m
2026-07-25 OCN5SG - Jul 25, 03:00 UTCJul 25, 04:30 UTC1h 30m
2026-07-24 OCN1213 RAK → RAK Jul 24, 17:15 UTCJul 24, 19:45 UTC2h 30m
2026-07-24 OCN3FB FRA → JSI Jul 24, 14:00 UTCJul 24, 16:15 UTC2h 15m
2026-07-24 OCN807 BDS → FRA Jul 24, 09:45 UTCJul 24, 11:40 UTC1h 55m
2026-07-24 OCN806 FRA → BDS Jul 24, 06:50 UTCJul 24, 08:25 UTC1h 35m
2026-07-23 OCN519 PMI → FRA Jul 23, 15:50 UTCJul 23, 17:50 UTC2h 0m
2026-07-23 OCN518 FRA → PMI Jul 23, 12:45 UTCJul 23, 14:35 UTC1h 50m
2026-07-23 OCN803 - Jul 23, 09:05 UTCJul 23, 11:05 UTC2h 0m
2026-07-23 OCN5SG - Jul 23, 06:15 UTCJul 23, 07:40 UTC1h 25m
2026-07-22 OCN515 - Jul 22, 18:30 UTCJul 22, 20:25 UTC1h 55m
2026-07-22 OCN6NH PMI → MUC Jul 22, 15:30 UTCJul 22, 17:10 UTC1h 40m
2026-07-22 OCN2JV - Jul 22, 10:20 UTCJul 22, 13:55 UTC3h 35m
2026-07-20 OCN3ME HER → FRA Jul 20, 17:35 UTCJul 20, 20:30 UTC2h 55m
2026-07-20 OCN7YZ - Jul 20, 13:35 UTCJul 20, 16:00 UTC2h 25m
2026-07-20 OCN2JV KGS → FRA Jul 20, 06:50 UTCJul 20, 09:45 UTC2h 55m
2026-07-20 OCN4TC FRA → KGS Jul 20, 03:05 UTCJul 20, 05:45 UTC2h 40m
2026-07-19 OCN2WK - Jul 19, 17:20 UTCJul 19, 18:40 UTC1h 20m
2026-07-19 OCN4EK - Jul 19, 14:55 UTCJul 19, 15:55 UTC1h 0m
2026-07-19 OCN8FE - Jul 19, 12:00 UTCJul 19, 13:45 UTC1h 45m
2026-07-19 OCN4WJ FRA → PMI Jul 19, 08:50 UTCJul 19, 10:35 UTC1h 45m
2026-07-19 OCN6GP ZAD → FRA Jul 19, 05:40 UTCJul 19, 07:00 UTC1h 20m
2026-07-19 OCN910 FRA → ZAD Jul 19, 03:35 UTCJul 19, 04:30 UTC55m
2026-07-18 OCN1225 HER → FRA Jul 18, 19:25 UTCJul 18, 19:50 UTC25m
2026-07-18 OCN3ME - Jul 18, 14:55 UTCJul 18, 17:50 UTC2h 55m
2026-07-18 OCN7YZ - Jul 18, 10:45 UTCJul 18, 13:15 UTC2h 30m
2026-07-18 OCN34D - Jul 18, 06:50 UTCJul 18, 09:05 UTC2h 15m
2026-07-18 OCN1408 - Jul 18, 03:20 UTCJul 18, 05:35 UTC2h 15m
2026-07-17 OCN6AR - Jul 17, 17:20 UTCJul 17, 19:15 UTC1h 55m
2026-07-17 OCN6MC - Jul 17, 12:55 UTCJul 17, 14:30 UTC1h 35m
2026-07-17 OCN2153 HER → FRA Jul 17, 08:25 UTCJul 17, 11:10 UTC2h 45m
2026-07-17 OCN1EL FRA → HER Jul 17, 04:14 UTCJul 17, 06:40 UTC2h 25m
2026-07-16 OCN519 PMI → FRA Jul 16, 16:19 UTCJul 16, 18:10 UTC1h 50m
2026-07-16 OCN518 FRA → PMI Jul 16, 13:20 UTCJul 16, 15:14 UTC1h 55m
2026-07-16 OCN803 - Jul 16, 09:35 UTCJul 16, 11:20 UTC1h 45m
2026-07-16 OCN5SG FRA → BRI Jul 16, 06:15 UTCJul 16, 07:45 UTC1h 30m
2026-07-15 OCN34D - Jul 15, 18:05 UTCJul 15, 20:30 UTC2h 25m
2026-07-15 OCN1408 - Jul 15, 14:05 UTCJul 15, 16:00 UTC1h 55m
2026-07-15 OCN4XK RHO → FRA Jul 15, 09:05 UTCJul 15, 12:20 UTC3h 15m
2026-07-15 OCN6AQ FRA → RHO Jul 15, 04:50 UTCJul 15, 07:30 UTC2h 40m
2026-07-14 OCN8FC JTR → FRA Jul 14, 15:05 UTCJul 14, 18:05 UTC3h 0m
2026-07-14 OCN6HP FRA → JTR Jul 14, 11:20 UTCJul 14, 13:40 UTC2h 20m

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?
Yes. Mode-S 3C66B9 is currently airborne.
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 OCN803, OCN8FE, OCN4WJ, OCN5SG, OCN6HP.