Apparatus

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sensors Mode-S transponder

3C66B5

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-AIUU · AIRBUS A-320

Hex
3C66B5
Octal
17063265
Decimal
3,958,453
Country
DE
Tail
D-AIUU
Type
A320
Broadcasting now · callsign OCN1286 · 34,975 ft
Flights observed
351
Distinct callsigns
20
Country
DE
Last broadcast
Jul 26, 21:05 UTC

Current position

3C66B5 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 3C66B5 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
OCN5EG - 21 2026-07-26
OCN424H - 20 2026-07-26
OCN452 O Air 15 2026-07-19
OCN7YP - 14 2026-07-19
OCN3VU - 12 2026-07-23
OCN3TG - 12 2026-07-23
OCN8HK - 11 2026-07-20
OCN5JU - 11 2026-06-24
OCN4AP - 11 2026-07-20
OCN3RH - 11 2026-07-10
OCN1L - 11 2026-06-24
OCN7MP - 10 2026-07-10
OCN5CE O Air 9 2026-07-20
OCN1411 - 9 2026-07-20
OCN6JR - 6 2026-06-29
OCN3PR - 6 2026-07-12
OCN3AV - 6 2026-06-29
OCN314 O Air 6 2026-07-21
OCN1WZ - 6 2026-07-02
OCN7E - 5 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 OCN424H - Jul 26, 17:35 UTCJul 26, 21:05 UTC3h 30m
2026-07-26 OCN5EG - Jul 26, 13:25 UTCJul 26, 16:10 UTC2h 45m
2026-07-26 OCN1XJ - Jul 26, 08:30 UTCJul 26, 11:45 UTC3h 15m
2026-07-26 OCN1286 MUC → LCA Jul 26, 04:10 UTCJul 26, 06:55 UTC2h 46m
2026-07-25 OCN705 FNC → MUC Jul 25, 16:40 UTCJul 25, 20:10 UTC3h 30m
2026-07-25 OCN2SH - Jul 25, 15:30 UTCJul 25, 15:40 UTC10m
2026-07-25 OCN2SH - Jul 25, 11:45 UTCJul 25, 14:55 UTC3h 10m
2026-07-25 OCN47C DJE → MUC Jul 25, 07:25 UTCJul 25, 09:35 UTC2h 10m
2026-07-25 OCN29K MUC → DJE Jul 25, 04:10 UTCJul 25, 06:00 UTC1h 50m
2026-07-24 OCN2X - Jul 24, 09:45 UTCJul 24, 12:20 UTC2h 35m
2026-07-24 OCN4MW MUC → XRY Jul 24, 05:35 UTCJul 24, 08:15 UTC2h 40m
2026-07-23 OCN3TG - Jul 23, 16:50 UTCJul 23, 19:20 UTC2h 30m
2026-07-23 OCN3VU - Jul 23, 13:20 UTCJul 23, 15:25 UTC2h 5m
2026-07-23 OCN1259 - Jul 23, 09:20 UTCJul 23, 11:50 UTC2h 30m
2026-07-23 OCN1258 - Jul 23, 05:50 UTCJul 23, 07:55 UTC2h 5m
2026-07-22 OCN424H - Jul 22, 15:25 UTCJul 22, 18:55 UTC3h 30m
2026-07-22 OCN5EG - Jul 22, 11:30 UTCJul 22, 14:10 UTC2h 40m
2026-07-21 OCN6EG LPA → MUC Jul 21, 16:35 UTCJul 21, 20:20 UTC3h 45m
2026-07-21 OCN314 MUC → LPA Jul 21, 10:45 UTCJul 21, 14:55 UTC4h 10m
2026-07-20 OCN8HK JMK → MUC Jul 20, 16:40 UTCJul 20, 19:00 UTC2h 20m
2026-07-20 OCN4AP - Jul 20, 13:35 UTCJul 20, 15:40 UTC2h 5m
2026-07-20 OCN1411 - Jul 20, 09:20 UTCJul 20, 11:20 UTC2h 0m
2026-07-20 OCN5CE MUC → VAR Jul 20, 06:35 UTCJul 20, 08:10 UTC1h 35m
2026-07-19 OCN7YP - Jul 19, 17:45 UTCJul 19, 19:25 UTC1h 40m
2026-07-19 OCN452 MUC → PMI Jul 19, 14:25 UTCJul 19, 16:20 UTC1h 55m
2026-07-19 OCN1267 ZTH → MUC Jul 19, 10:30 UTCJul 19, 12:45 UTC2h 15m
2026-07-18 OCN2G - Jul 18, 17:20 UTCJul 18, 19:25 UTC2h 5m
2026-07-18 OCN8HK - Jul 18, 11:05 UTCJul 18, 13:35 UTC2h 30m
2026-07-18 OCN4AP - Jul 18, 07:30 UTCJul 18, 09:35 UTC2h 5m
2026-07-17 OCN424H LCA → MUC Jul 17, 18:15 UTCJul 17, 21:34 UTC3h 20m
2026-07-17 OCN5EG - Jul 17, 14:15 UTCJul 17, 17:09 UTC2h 55m
2026-07-17 OCN1XJ - Jul 17, 08:40 UTCJul 17, 11:55 UTC3h 15m
2026-07-17 OCN1286 MUC → LCA Jul 17, 04:25 UTCJul 17, 07:14 UTC2h 50m
2026-07-16 OCN424H LCA → MUC Jul 16, 15:40 UTCJul 16, 19:05 UTC3h 25m
2026-07-16 OCN5EG - Jul 16, 11:10 UTCJul 16, 14:10 UTC3h 0m
2026-07-16 OCN3MY - Jul 16, 07:30 UTCJul 16, 09:10 UTC1h 40m
2026-07-16 OCN9VK - Jul 16, 04:25 UTCJul 16, 05:50 UTC1h 25m
2026-07-15 OCN1411 - Jul 15, 18:40 UTCJul 15, 20:50 UTC2h 10m
2026-07-15 OCN5CE - Jul 15, 15:55 UTCJul 15, 17:40 UTC1h 45m
2026-07-15 OCN705 FNC → MUC Jul 15, 11:15 UTCJul 15, 14:45 UTC3h 30m
2026-07-15 OCN2SH MUC → FNC Jul 15, 05:40 UTCJul 15, 09:55 UTC4h 15m
2026-07-14 OCN6EG LPA → MUC Jul 14, 16:30 UTCJul 14, 20:05 UTC3h 35m
2026-07-14 OCN314 MUC → LPA Jul 14, 10:30 UTCJul 14, 13:45 UTC3h 15m
2026-07-13 OCN424H LCA → MUC Jul 13, 15:25 UTCJul 13, 18:45 UTC3h 20m
2026-07-13 OCN5EG MUC → LCA Jul 13, 11:05 UTCJul 13, 13:55 UTC2h 50m
2026-07-12 OCN7E - Jul 12, 17:10 UTCJul 12, 20:50 UTC3h 40m
2026-07-12 OCN3PR - Jul 12, 11:01 UTCJul 12, 15:20 UTC4h 20m
2026-07-11 OCN431 MAH → MUC Jul 11, 19:00 UTCJul 11, 20:45 UTC1h 45m
2026-07-11 OCN6L MUC → MUC Jul 11, 15:45 UTCJul 11, 17:30 UTC1h 45m
2026-07-11 OCN1307 - Jul 11, 11:50 UTCJul 11, 14:35 UTC2h 45m

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

Mode-S 3C66B5 frequently asked

What is Mode-S code 3C66B5?
3C66B5 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AIUU.
Where is Mode-S 3C66B5 registered?
Mode-S code 3C66B5 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C66B5 broadcasting right now?
Yes. Mode-S 3C66B5 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C66B5, octal 17063265, decimal 3,958,453.
What flights does 3C66B5 operate?
Mode-S 3C66B5 has broadcast 20 distinct callsigns, including OCN5EG, OCN424H, OCN452, OCN7YP, OCN3VU.