Apparatus

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sensors Mode-S transponder

3C5421

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-AEAA · AIRBUS A-300-600

Hex
3C5421
Octal
17052041
Decimal
3,953,697
Country
DE
Tail
D-AEAA
Type
A306
No current signal · last broadcast 7h ago
Flights observed
142
Distinct callsigns
20
Country
DE
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 3C5421.

Country allocation

The ICAO 24-bit address 3C5421 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
BCS2EV - 16 2026-07-08
BCS48B - 13 2026-07-08
BCS55K European Air Transport 8 2026-07-06
BCS3LR - 7 2026-07-06
BCS9TC - 5 2026-07-02
BCS73B - 5 2026-07-09
BCS90Y - 4 2026-06-14
BCS4GC European Air Transport 4 2026-05-07
BCS44C - 4 2026-06-24
BCS20A - 4 2026-06-24
BCS1MU European Air Transport 4 2026-05-08
BCS58L European Air Transport 3 2026-06-18
BCS2FC - 3 2026-07-09
BCS1LG - 3 2026-07-09
BCS198 - 3 2026-06-30
BCS186 - 3 2026-07-10
BCS6GA - 2 2026-07-14
BCS6769 European Air Transport 2 2026-06-14
BCS5WE - 2 2026-06-25
BCS3265 - 2 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 BCS48D - Jul 14, 06:35 UTCJul 14, 07:25 UTC50m
2026-07-14 BCS6GA BRU → MXP Jul 14, 01:15 UTCJul 14, 02:20 UTC1h 5m
2026-07-13 BCS2UR MAD → BRU Jul 13, 20:20 UTCJul 13, 21:55 UTC1h 35m
2026-07-12 BCS230P ATH → MAD Jul 12, 23:55 UTCJul 13, 03:10 UTC3h 15m
2026-07-12 BCS6045 OPO → ATH Jul 12, 18:40 UTCJul 12, 21:55 UTC3h 15m
2026-07-12 BCS231P CDG → ATH Jul 12, 12:35 UTCJul 12, 13:30 UTC55m
2026-07-11 BCS7CK MXP → MAD Jul 11, 01:25 UTCJul 11, 03:05 UTC1h 40m
2026-07-10 BCS37R - Jul 10, 22:10 UTCJul 10, 23:55 UTC1h 45m
2026-07-10 BCS6360 - Jul 10, 17:05 UTCJul 10, 19:20 UTC2h 15m
2026-07-10 BCS186 - Jul 10, 02:35 UTCJul 10, 03:15 UTC40m
2026-07-09 BCS1LG LIS → LEJ Jul 9, 18:55 UTCJul 9, 21:50 UTC2h 55m
2026-07-09 BCS2FC - Jul 9, 05:20 UTCJul 9, 06:35 UTC1h 15m
2026-07-09 BCS73B - Jul 9, 00:40 UTCJul 9, 02:35 UTC1h 55m
2026-07-08 BCS48B - Jul 8, 20:55 UTCJul 8, 22:00 UTC1h 5m
2026-07-08 BCS2EV LEJ → CDG Jul 8, 00:35 UTCJul 8, 01:40 UTC1h 5m
2026-07-07 BCS48B - Jul 7, 21:10 UTCJul 7, 22:20 UTC1h 10m
2026-07-07 BCS2EV LEJ → CDG Jul 7, 00:40 UTCJul 7, 01:50 UTC1h 10m
2026-07-06 BCS55K BCN → LEJ Jul 6, 20:15 UTCJul 6, 22:15 UTC2h 0m
2026-07-06 BCS3LR LEJ → BCN Jul 6, 00:20 UTCJul 6, 02:10 UTC1h 50m
2026-07-04 BCS6RN - Jul 4, 18:50 UTCJul 4, 19:40 UTC50m
2026-07-04 BCS4958 - Jul 4, 06:00 UTCJul 4, 06:25 UTC25m
2026-07-04 BCS53A LEJ → GVA Jul 4, 02:55 UTCJul 4, 04:10 UTC1h 15m
2026-07-03 BCS3265 - Jul 3, 20:15 UTCJul 3, 21:20 UTC1h 5m
2026-07-03 BCS51M - Jul 3, 18:20 UTCJul 3, 18:45 UTC25m
2026-07-03 BCS3906 - Jul 3, 05:45 UTCJul 3, 06:20 UTC35m
2026-07-03 BCS3264 - Jul 3, 03:00 UTCJul 3, 04:05 UTC1h 5m
2026-07-02 BCS9TC - Jul 2, 21:10 UTCJul 2, 23:05 UTC1h 55m
2026-06-30 BCS198 - Jun 30, 02:10 UTCJun 30, 04:10 UTC2h 0m
2026-06-29 BCS3YK OPO → LEJ Jun 29, 19:09 UTCJun 29, 21:44 UTC2h 35m
2026-06-29 BCS57D - Jun 29, 04:09 UTCJun 29, 05:04 UTC55m
2026-06-28 BCS73B - Jun 28, 21:50 UTCJun 28, 23:50 UTC2h 0m
2026-06-26 BCS9TC - Jun 26, 21:45 UTCJun 26, 23:44 UTC2h 0m
2026-06-25 BCS36V - Jun 25, 18:24 UTCJun 25, 19:15 UTC50m
2026-06-25 BCS5WE - Jun 25, 06:09 UTCJun 25, 07:15 UTC1h 5m
2026-06-25 BCS198 - Jun 25, 01:59 UTCJun 25, 03:54 UTC1h 55m
2026-06-24 BCS44C CPH → LEJ Jun 24, 21:29 UTCJun 24, 22:14 UTC45m
2026-06-24 BCS20A LEJ → CPH Jun 24, 02:09 UTCJun 24, 03:00 UTC50m
2026-06-23 BCS9TC - Jun 23, 21:20 UTCJun 23, 23:19 UTC2h 0m
2026-06-23 BCS73B - Jun 23, 00:39 UTCJun 23, 02:34 UTC1h 55m
2026-06-22 BCS20D BSL → LEJ Jun 22, 20:44 UTCJun 22, 21:35 UTC50m
2026-06-22 BCS77G LEJ → BSL Jun 22, 02:25 UTCJun 22, 03:10 UTC45m
2026-06-19 BCS6VC STR → LEJ Jun 19, 20:19 UTCJun 19, 21:04 UTC45m
2026-06-19 BCS3LF LEJ → STR Jun 19, 04:04 UTCJun 19, 04:44 UTC40m
2026-06-18 BCS58L CDG → LEJ Jun 18, 22:50 UTCJun 18, 23:55 UTC1h 5m
2026-06-18 BCS2EV - Jun 18, 00:25 UTCJun 18, 01:35 UTC1h 10m
2026-06-17 BCS48B - Jun 17, 21:05 UTCJun 17, 22:15 UTC1h 10m
2026-06-17 BCS2EV LEJ → CDG Jun 17, 01:00 UTCJun 17, 02:10 UTC1h 10m
2026-06-16 BCS48B - Jun 16, 21:05 UTCJun 16, 22:15 UTC1h 10m
2026-06-16 BCS2EV LEJ → CDG Jun 16, 00:55 UTCJun 16, 02:00 UTC1h 5m
2026-06-15 BCS48B - Jun 15, 21:09 UTCJun 15, 22:20 UTC1h 10m

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

Mode-S 3C5421 frequently asked

What is Mode-S code 3C5421?
3C5421 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AEAA.
Where is Mode-S 3C5421 registered?
Mode-S code 3C5421 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C5421 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C5421, octal 17052041, decimal 3,953,697.
What flights does 3C5421 operate?
Mode-S 3C5421 has broadcast 20 distinct callsigns, including BCS2EV, BCS48B, BCS55K, BCS3LR, BCS9TC.