Apparatus

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sensors Mode-S transponder

3C5821

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-AFAA · BOMBARDIER CL-600 Challenger

Hex
3C5821
Octal
17054041
Decimal
3,954,721
Country
DE
Tail
D-AFAA
Type
CL60
No current signal · last broadcast 1d ago
Flights observed
55
Distinct callsigns
18
Country
DE
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 3C5821.

Country allocation

The ICAO 24-bit address 3C5821 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 18 distinct

Callsign Airline Flights Last seen
IFA1163 - 8 2026-05-20
IFA4043 - 6 2026-05-23
IFA4050 - 4 2026-06-28
IFA1221 - 4 2026-06-24
IFA1140 - 4 2026-05-01
IFA4045 - 3 2026-06-09
IFA1257 - 3 2026-07-16
IFA1229 - 3 2026-07-03
IFA1216 - 3 2026-06-21
IFA1192 - 3 2026-06-06
IFA1133 - 3 2026-04-23
IFA1201 - 2 2026-06-14
IFA1188 - 2 2026-06-04
IFA1144 - 2 2026-05-03
IFA1131 - 2 2026-04-19
IFA4038 - 1 2026-05-03
IFA1194 - 1 2026-06-11
IFA1119 - 1 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 IFA1257 KEF → TEB Jul 16, 17:25 UTCJul 16, 22:55 UTC5h 30m
2026-07-16 IFA1257 - Jul 16, 11:20 UTCJul 16, 16:30 UTC5h 10m
2026-07-15 IFA1257 - Jul 15, 21:10 UTCJul 15, 23:00 UTC1h 50m
2026-07-03 IFA1229 - Jul 3, 12:00 UTCJul 3, 12:50 UTC50m
2026-06-30 IFA1229 - Jun 30, 16:25 UTCJun 30, 20:05 UTC3h 40m
2026-06-30 IFA1229 - Jun 30, 05:15 UTCJun 30, 11:20 UTC6h 5m
2026-06-28 IFA4050 KEF → BED Jun 28, 19:59 UTCJun 29, 00:54 UTC4h 55m
2026-06-28 IFA4050 NUE → KEF Jun 28, 15:40 UTCJun 28, 18:44 UTC3h 5m
2026-06-28 IFA4050 - Jun 28, 07:29 UTCJun 28, 14:04 UTC6h 35m
2026-06-27 IFA4050 - Jun 27, 08:29 UTCJun 27, 15:05 UTC6h 35m
2026-06-24 IFA1221 - Jun 24, 23:29 UTCJun 24, 23:40 UTC10m
2026-06-24 IFA1221 - Jun 24, 22:55 UTCJun 24, 23:24 UTC30m
2026-06-24 IFA1221 IBZ → RTM Jun 24, 18:25 UTCJun 24, 20:24 UTC2h 0m
2026-06-24 IFA1221 NUE → IBZ Jun 24, 14:29 UTCJun 24, 16:29 UTC2h 0m
2026-06-21 IFA1216 ERF → NUE Jun 21, 16:04 UTCJun 21, 16:30 UTC25m
2026-06-21 IFA1216 - Jun 21, 12:04 UTCJun 21, 13:44 UTC1h 40m
2026-06-20 IFA1216 NUE → DUS Jun 20, 09:09 UTCJun 20, 19:24 UTC10h 15m
2026-06-14 IFA1201 - Jun 14, 19:45 UTCJun 14, 20:25 UTC40m
2026-06-13 IFA1201 - Jun 13, 09:20 UTCJun 13, 20:25 UTC11h 5m
2026-06-11 IFA1194 - Jun 11, 14:00 UTCJun 11, 17:25 UTC3h 25m
2026-06-09 IFA4045 - Jun 9, 14:30 UTCJun 9, 18:10 UTC3h 40m
2026-06-09 IFA4045 CGN → NUE Jun 9, 12:25 UTCJun 9, 13:05 UTC40m
2026-06-09 IFA4045 NUE → CGN Jun 9, 08:30 UTCJun 9, 09:10 UTC40m
2026-06-06 IFA1192 EDI → NUE Jun 6, 15:50 UTCJun 6, 17:29 UTC1h 40m
2026-06-06 IFA1192 - Jun 6, 09:39 UTCJun 6, 13:05 UTC3h 25m
2026-06-06 IFA1192 - Jun 6, 05:40 UTCJun 6, 07:15 UTC1h 35m
2026-06-04 IFA1188 - Jun 4, 04:45 UTCJun 4, 09:05 UTC4h 20m
2026-06-02 IFA1188 - Jun 2, 16:40 UTCJun 2, 20:20 UTC3h 40m
2026-05-23 IFA4043 - May 23, 10:10 UTCMay 23, 11:20 UTC1h 10m
2026-05-22 IFA4043 NUE → STN May 22, 02:10 UTCMay 22, 03:25 UTC1h 15m
2026-05-21 IFA4043 - May 21, 18:00 UTCMay 22, 01:10 UTC7h 10m
2026-05-21 IFA4043 - May 21, 00:20 UTCMay 22, 00:15 UTC23h 55m
2026-05-20 IFA4043 - May 20, 22:20 UTCMay 21, 22:15 UTC23h 55m
2026-05-20 IFA4043 - May 20, 21:05 UTCMay 21, 18:35 UTC21h 30m
2026-05-20 IFA1163 - May 20, 10:10 UTCMay 20, 10:40 UTC30m
2026-05-17 IFA1163 - May 17, 19:10 UTCMay 17, 21:10 UTC2h 0m
2026-05-17 IFA1163 - May 17, 17:55 UTCMay 17, 18:05 UTC10m
2026-05-17 IFA1163 - May 17, 09:10 UTCMay 17, 17:05 UTC7h 55m
2026-05-16 IFA1163 - May 16, 07:45 UTCMay 16, 09:40 UTC1h 55m
2026-05-15 IFA1163 - May 15, 10:20 UTCMay 16, 09:40 UTC23h 20m
2026-05-15 IFA1163 - May 15, 08:20 UTCMay 16, 08:16 UTC23h 55m
2026-05-15 IFA1163 - May 15, 07:05 UTCMay 15, 10:50 UTC3h 45m
2026-05-03 IFA4038 NUE → NUE May 3, 14:35 UTCMay 3, 14:45 UTC10m
2026-05-03 IFA1144 - May 3, 11:50 UTCMay 3, 13:00 UTC1h 10m
2026-05-01 IFA1144 NUE → WMI May 1, 23:35 UTCMay 2, 15:00 UTC15h 25m
2026-05-01 IFA1140 LPL → NUE May 1, 20:10 UTCMay 1, 21:40 UTC1h 30m
2026-04-30 IFA1140 - Apr 30, 20:00 UTCApr 30, 21:35 UTC1h 35m
2026-04-30 IFA1140 - Apr 30, 05:45 UTCApr 30, 19:20 UTC13h 35m
2026-04-28 IFA1140 - Apr 28, 21:50 UTCApr 29, 10:05 UTC12h 16m
2026-04-23 IFA1133 - Apr 23, 09:20 UTCApr 23, 10:05 UTC45m

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

Mode-S 3C5821 frequently asked

What is Mode-S code 3C5821?
3C5821 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-AFAA.
Where is Mode-S 3C5821 registered?
Mode-S code 3C5821 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C5821 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C5821, octal 17054041, decimal 3,954,721.
What flights does 3C5821 operate?
Mode-S 3C5821 has broadcast 18 distinct callsigns, including IFA1163, IFA4043, IFA4050, IFA1221, IFA1140.