sensors Mode-S transponder
AF8421
ICAO 24-bit transponder address
- Hex
- AF8421
- Octal
- 53702041
- Decimal
- 11,502,625
- Type
- Q9
- Flights observed
- 41
- Distinct callsigns
- 5
- Country
- -
- Last broadcast
- 1d ago
Last known position
Callsign history 5 distinct
Recent flights last 41
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | TROY709 | - | Jul 13, 21:40 UTC | Jul 13, 22:15 UTC | 35m |
| 2026-07-13 | TROY709 | - | Jul 13, 13:45 UTC | Jul 13, 14:00 UTC | 15m |
| 2026-07-10 | CBP245 | - | Jul 10, 14:55 UTC | Jul 10, 21:55 UTC | 7h 0m |
| 2026-07-09 | CBP245 | - | Jul 9, 13:50 UTC | Jul 9, 22:25 UTC | 8h 35m |
| 2026-07-08 | CBP245 | - | Jul 8, 13:45 UTC | Jul 8, 21:50 UTC | 8h 5m |
| 2026-07-07 | TROY709 | - | Jul 7, 13:40 UTC | Jul 7, 16:55 UTC | 3h 15m |
| 2026-07-02 | TROY709 | - | Jul 2, 13:30 UTC | Jul 2, 15:20 UTC | 1h 50m |
| 2026-07-01 | TROY709 | - | Jul 1, 21:50 UTC | Jul 1, 22:10 UTC | 20m |
| 2026-06-30 | CBP245 | - | Jun 30, 21:40 UTC | Jun 30, 21:50 UTC | 10m |
| 2026-06-30 | CBP245 | - | Jun 30, 13:45 UTC | Jun 30, 14:40 UTC | 55m |
| 2026-06-26 | TY709 | - | Jun 26, 13:49 UTC | Jun 26, 17:29 UTC | 3h 40m |
| 2026-06-25 | T709 | FAR → FAR | Jun 25, 15:24 UTC | Jun 25, 21:35 UTC | 6h 10m |
| 2026-06-22 | T709 | - | Jun 22, 21:00 UTC | Jun 22, 21:25 UTC | 25m |
| 2026-06-22 | T709 | - | Jun 22, 13:44 UTC | Jun 22, 13:59 UTC | 15m |
| 2026-06-18 | TROY709 | - | Jun 18, 16:55 UTC | Jun 18, 21:10 UTC | 4h 15m |
| 2026-06-16 | TROY709 | - | Jun 16, 15:30 UTC | Jun 16, 20:25 UTC | 4h 56m |
| 2026-06-16 | TROY709 | - | Jun 16, 13:50 UTC | Jun 16, 14:15 UTC | 25m |
| 2026-06-15 | T709 | FAR → FAR | Jun 15, 13:40 UTC | Jun 15, 18:55 UTC | 5h 15m |
| 2026-06-12 | TROY709 | - | Jun 12, 17:20 UTC | Jun 12, 17:45 UTC | 25m |
| 2026-06-12 | TROY709 | - | Jun 12, 13:30 UTC | Jun 12, 15:45 UTC | 2h 15m |
| 2026-06-09 | TROY709 | - | Jun 9, 13:20 UTC | Jun 9, 13:50 UTC | 30m |
| 2026-06-08 | TROY709 | - | Jun 8, 22:00 UTC | Jun 8, 22:15 UTC | 15m |
| 2026-06-08 | TROY709 | - | Jun 8, 15:20 UTC | Jun 8, 15:55 UTC | 35m |
| 2026-06-04 | TROY709 | - | Jun 4, 19:35 UTC | Jun 4, 20:15 UTC | 40m |
| 2026-06-02 | TROY709 | - | Jun 2, 21:35 UTC | Jun 2, 22:05 UTC | 30m |
| 2026-06-02 | TROY709 | - | Jun 2, 17:25 UTC | Jun 2, 19:00 UTC | 1h 35m |
| 2026-06-02 | TROY709 | - | Jun 2, 16:10 UTC | Jun 2, 16:40 UTC | 30m |
| 2026-06-02 | TROY709 | - | Jun 2, 13:30 UTC | Jun 2, 15:20 UTC | 1h 50m |
| 2026-05-29 | T709 | - | May 29, 13:20 UTC | May 29, 13:45 UTC | 25m |
| 2026-05-28 | T709 | - | May 28, 13:30 UTC | May 28, 13:45 UTC | 15m |
| 2026-05-27 | T709 | - | May 27, 20:25 UTC | May 27, 22:20 UTC | 1h 55m |
| 2026-05-27 | T709 | - | May 27, 19:15 UTC | May 27, 19:45 UTC | 30m |
| 2026-05-27 | T709 | - | May 27, 13:35 UTC | May 27, 18:30 UTC | 4h 55m |
| 2026-05-26 | T709 | - | May 26, 13:34 UTC | May 26, 21:59 UTC | 8h 25m |
| 2026-05-22 | T709 | - | May 22, 13:20 UTC | May 22, 16:15 UTC | 2h 55m |
| 2026-05-11 | TROY709 | - | May 11, 14:15 UTC | May 11, 15:25 UTC | 1h 10m |
| 2026-04-28 | 709 | - | Apr 28, 21:05 UTC | Apr 28, 21:25 UTC | 20m |
| 2026-04-28 | 709 | - | Apr 28, 13:35 UTC | Apr 28, 14:50 UTC | 1h 15m |
| 2026-04-24 | T709 | - | Apr 24, 19:20 UTC | Apr 24, 22:15 UTC | 2h 55m |
| 2026-04-24 | T709 | - | Apr 24, 13:50 UTC | Apr 24, 14:30 UTC | 40m |
| 2026-04-22 | T709 | - | Apr 22, 13:55 UTC | Apr 22, 14:05 UTC | 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.