sensors Mode-S transponder
39E121
ICAO 24-bit transponder address · allocated to France
Currently assigned to F-HYJB · AIRPLANE FACTORY Sling 2
- Hex
- 39E121
- Octal
- 16360441
- Decimal
- 3,793,185
- Country
- FR
- Tail
- F-HYJB
- Type
- SLG2
- Flights observed
- 83
- Distinct callsigns
- 1
- Country
- FR
- Last broadcast
- Jun 22, 12:19 UTC
Last known position
Country allocation
The ICAO 24-bit address 39E121 falls within the block assigned to France (FR) by ICAO Annex 10, Volume III. Every aircraft registered in France 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| FHYJB | - | 83 | 2026-06-22 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-22 | FHYJB | - | Jun 22, 12:05 UTC | Jun 22, 12:19 UTC | 15m |
| 2026-06-22 | FHYJB | - | Jun 22, 08:19 UTC | Jun 22, 08:44 UTC | 25m |
| 2026-06-21 | FHYJB | - | Jun 21, 13:29 UTC | Jun 21, 13:39 UTC | 10m |
| 2026-06-21 | FHYJB | - | Jun 21, 08:40 UTC | Jun 21, 08:49 UTC | 10m |
| 2026-06-21 | FHYJB | - | Jun 21, 07:14 UTC | Jun 21, 07:55 UTC | 40m |
| 2026-06-20 | FHYJB | - | Jun 20, 17:19 UTC | Jun 20, 17:29 UTC | 10m |
| 2026-06-20 | FHYJB | - | Jun 20, 10:15 UTC | Jun 20, 10:39 UTC | 25m |
| 2026-06-18 | FHYJB | - | Jun 18, 10:20 UTC | Jun 18, 10:35 UTC | 15m |
| 2026-06-17 | FHYJB | - | Jun 17, 14:10 UTC | Jun 17, 14:45 UTC | 35m |
| 2026-06-17 | FHYJB | - | Jun 17, 10:50 UTC | Jun 17, 11:50 UTC | 1h 0m |
| 2026-06-17 | FHYJB | - | Jun 17, 09:35 UTC | Jun 17, 09:55 UTC | 20m |
| 2026-06-15 | FHYJB | - | Jun 15, 11:05 UTC | Jun 15, 11:30 UTC | 25m |
| 2026-06-14 | FHYJB | - | Jun 14, 13:00 UTC | Jun 14, 14:35 UTC | 1h 35m |
| 2026-06-14 | FHYJB | - | Jun 14, 11:35 UTC | Jun 14, 12:00 UTC | 25m |
| 2026-06-14 | FHYJB | - | Jun 14, 08:30 UTC | Jun 14, 10:40 UTC | 2h 10m |
| 2026-06-13 | FHYJB | DOL → DOL | Jun 13, 17:00 UTC | Jun 13, 17:40 UTC | 40m |
| 2026-06-13 | FHYJB | DOL → DOL | Jun 13, 15:10 UTC | Jun 13, 16:05 UTC | 55m |
| 2026-06-13 | FHYJB | - | Jun 13, 13:15 UTC | Jun 13, 13:50 UTC | 35m |
| 2026-06-13 | FHYJB | - | Jun 13, 10:00 UTC | Jun 13, 10:20 UTC | 20m |
| 2026-06-13 | FHYJB | - | Jun 13, 07:30 UTC | Jun 13, 08:00 UTC | 30m |
| 2026-06-10 | FHYJB | - | Jun 10, 08:15 UTC | Jun 10, 08:45 UTC | 30m |
| 2026-06-07 | FHYJB | - | Jun 7, 14:35 UTC | Jun 7, 14:55 UTC | 20m |
| 2026-06-07 | FHYJB | - | Jun 7, 12:40 UTC | Jun 7, 13:30 UTC | 50m |
| 2026-06-01 | FHYJB | - | Jun 1, 13:25 UTC | Jun 1, 13:35 UTC | 10m |
| 2026-05-31 | FHYJB | - | May 31, 15:40 UTC | May 31, 16:30 UTC | 50m |
| 2026-05-31 | FHYJB | - | May 31, 14:20 UTC | May 31, 14:40 UTC | 20m |
| 2026-05-30 | FHYJB | - | May 30, 15:55 UTC | May 30, 16:15 UTC | 20m |
| 2026-05-30 | FHYJB | DOL → DOL | May 30, 13:00 UTC | May 30, 13:35 UTC | 35m |
| 2026-05-29 | FHYJB | - | May 29, 14:10 UTC | May 29, 14:25 UTC | 15m |
| 2026-05-29 | FHYJB | - | May 29, 13:20 UTC | May 29, 13:35 UTC | 15m |
| 2026-05-29 | FHYJB | - | May 29, 09:35 UTC | May 29, 09:45 UTC | 10m |
| 2026-05-27 | FHYJB | - | May 27, 15:00 UTC | May 27, 15:35 UTC | 35m |
| 2026-05-24 | FHYJB | - | May 24, 16:35 UTC | May 24, 16:50 UTC | 15m |
| 2026-05-23 | FHYJB | - | May 23, 11:35 UTC | May 23, 12:00 UTC | 25m |
| 2026-05-22 | FHYJB | - | May 22, 17:15 UTC | May 22, 18:25 UTC | 1h 10m |
| 2026-05-22 | FHYJB | - | May 22, 15:30 UTC | May 22, 16:35 UTC | 1h 5m |
| 2026-05-22 | FHYJB | - | May 22, 07:50 UTC | May 22, 08:30 UTC | 40m |
| 2026-05-20 | FHYJB | - | May 20, 18:05 UTC | May 20, 19:15 UTC | 1h 10m |
| 2026-05-20 | FHYJB | - | May 20, 14:50 UTC | May 20, 15:30 UTC | 40m |
| 2026-05-18 | FHYJB | - | May 18, 13:15 UTC | May 18, 13:40 UTC | 25m |
| 2026-05-17 | FHYJB | - | May 17, 13:50 UTC | May 17, 14:35 UTC | 45m |
| 2026-05-16 | FHYJB | - | May 16, 13:46 UTC | May 16, 14:05 UTC | 20m |
| 2026-05-16 | FHYJB | - | May 16, 10:46 UTC | May 16, 11:11 UTC | 25m |
| 2026-05-16 | FHYJB | - | May 16, 09:10 UTC | May 16, 09:45 UTC | 35m |
| 2026-05-15 | FHYJB | DOL → DOL | May 15, 15:30 UTC | May 15, 15:45 UTC | 15m |
| 2026-05-14 | FHYJB | - | May 14, 12:20 UTC | May 14, 12:50 UTC | 30m |
| 2026-05-11 | FHYJB | - | May 11, 09:15 UTC | May 11, 09:50 UTC | 35m |
| 2026-05-10 | FHYJB | DOL → DOL | May 10, 11:05 UTC | May 10, 11:25 UTC | 20m |
| 2026-05-10 | FHYJB | - | May 10, 09:35 UTC | May 10, 09:55 UTC | 20m |
| 2026-05-09 | FHYJB | - | May 9, 14:25 UTC | May 9, 15:05 UTC | 40m |
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 F-HYJB page for operator, model, and routing details .