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
- Flights observed
- 28
- Distinct callsigns
- 9
- Country
- DE
- Last broadcast
- 8h ago
Last known position
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 9 distinct
Recent flights last 28
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | IFA1188 | - | Jun 2, 16:40 UTC | Jun 2, 20:20 UTC | 3h 40m |
| 2026-05-23 | IFA4043 | - | May 23, 10:10 UTC | May 23, 11:20 UTC | 1h 10m |
| 2026-05-22 | IFA4043 | NUE → STN | May 22, 02:10 UTC | May 22, 03:25 UTC | 1h 15m |
| 2026-05-21 | IFA4043 | - | May 21, 18:00 UTC | May 22, 01:10 UTC | 7h 10m |
| 2026-05-21 | IFA4043 | - | May 21, 00:20 UTC | May 22, 00:15 UTC | 23h 55m |
| 2026-05-20 | IFA4043 | - | May 20, 22:20 UTC | May 21, 22:15 UTC | 23h 55m |
| 2026-05-20 | IFA4043 | - | May 20, 21:05 UTC | May 21, 18:35 UTC | 21h 30m |
| 2026-05-20 | IFA1163 | - | May 20, 10:10 UTC | May 20, 10:40 UTC | 30m |
| 2026-05-17 | IFA1163 | - | May 17, 19:10 UTC | May 17, 21:10 UTC | 2h 0m |
| 2026-05-17 | IFA1163 | - | May 17, 17:55 UTC | May 17, 18:05 UTC | 10m |
| 2026-05-17 | IFA1163 | - | May 17, 09:10 UTC | May 17, 17:05 UTC | 7h 55m |
| 2026-05-16 | IFA1163 | - | May 16, 07:45 UTC | May 16, 09:40 UTC | 1h 55m |
| 2026-05-15 | IFA1163 | - | May 15, 10:20 UTC | May 16, 09:40 UTC | 23h 20m |
| 2026-05-15 | IFA1163 | - | May 15, 08:20 UTC | May 16, 08:16 UTC | 23h 55m |
| 2026-05-15 | IFA1163 | - | May 15, 07:05 UTC | May 15, 10:50 UTC | 3h 45m |
| 2026-05-03 | IFA4038 | NUE → NUE | May 3, 14:35 UTC | May 3, 14:45 UTC | 10m |
| 2026-05-03 | IFA1144 | - | May 3, 11:50 UTC | May 3, 13:00 UTC | 1h 10m |
| 2026-05-01 | IFA1144 | NUE → WMI | May 1, 23:35 UTC | May 2, 15:00 UTC | 15h 25m |
| 2026-05-01 | IFA1140 | LPL → NUE | May 1, 20:10 UTC | May 1, 21:40 UTC | 1h 30m |
| 2026-04-30 | IFA1140 | - | Apr 30, 20:00 UTC | Apr 30, 21:35 UTC | 1h 35m |
| 2026-04-30 | IFA1140 | - | Apr 30, 05:45 UTC | Apr 30, 19:20 UTC | 13h 35m |
| 2026-04-28 | IFA1140 | - | Apr 28, 21:50 UTC | Apr 29, 10:05 UTC | 12h 16m |
| 2026-04-23 | IFA1133 | - | Apr 23, 09:20 UTC | Apr 23, 10:05 UTC | 45m |
| 2026-04-21 | IFA1133 | - | Apr 21, 21:15 UTC | Apr 21, 23:40 UTC | 2h 25m |
| 2026-04-21 | IFA1133 | - | Apr 21, 15:31 UTC | Apr 21, 18:20 UTC | 2h 50m |
| 2026-04-19 | IFA1131 | - | Apr 19, 00:45 UTC | Apr 19, 01:15 UTC | 30m |
| 2026-04-18 | IFA1131 | NUE → RMS | Apr 18, 12:05 UTC | Apr 19, 00:00 UTC | 11h 55m |
| 2026-04-15 | IFA1119 | - | Apr 15, 13:45 UTC | Apr 15, 14:55 UTC | 1h 9m |
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 .