sensors Mode-S transponder
AE1859
ICAO 24-bit transponder address
Currently assigned to 04-03739 · BOEING-VERTOL CH-47 Chinook
- Hex
- AE1859
- Octal
- 53414131
- Decimal
- 11,409,497
- Tail
- 04-03739
- Type
- H47
- Flights observed
- 34
- Distinct callsigns
- 10
- Country
- -
- Last broadcast
- 17d ago
Last known position
Callsign history 10 distinct
Recent flights last 34
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-30 | FENCE44 | - | Jun 30, 22:55 UTC | Jun 30, 23:25 UTC | 30m |
| 2026-06-30 | FENCE44 | - | Jun 30, 20:20 UTC | Jun 30, 21:25 UTC | 1h 5m |
| 2026-06-29 | FENCE44 | - | Jun 29, 19:39 UTC | Jun 29, 19:54 UTC | 15m |
| 2026-06-29 | FENCE44 | - | Jun 29, 17:14 UTC | Jun 29, 17:49 UTC | 35m |
| 2026-06-26 | FENCE44 | HOP → HOP | Jun 26, 18:49 UTC | Jun 26, 20:10 UTC | 1h 20m |
| 2026-06-26 | FENCE44 | HOP → HOP | Jun 26, 17:15 UTC | Jun 26, 18:09 UTC | 55m |
| 2026-06-24 | FENCE41 | - | Jun 24, 01:39 UTC | Jun 24, 02:49 UTC | 1h 10m |
| 2026-06-24 | FENCE41 | - | Jun 24, 00:05 UTC | Jun 24, 00:44 UTC | 40m |
| 2026-06-23 | FENCE41 | - | Jun 23, 23:19 UTC | Jun 23, 23:34 UTC | 15m |
| 2026-06-10 | FENCE52 | - | Jun 10, 03:00 UTC | Jun 10, 03:20 UTC | 20m |
| 2026-06-04 | FENCE42 | - | Jun 4, 04:20 UTC | Jun 4, 05:20 UTC | 1h 0m |
| 2026-06-04 | FENCE42 | - | Jun 4, 02:05 UTC | Jun 4, 03:00 UTC | 55m |
| 2026-06-01 | PUTT81 | - | Jun 1, 14:00 UTC | Jun 1, 17:15 UTC | 3h 15m |
| 2026-05-28 | PUTT81 | - | May 28, 03:35 UTC | May 28, 04:05 UTC | 30m |
| 2026-05-28 | PUTT81 | - | May 28, 00:55 UTC | May 28, 02:35 UTC | 1h 40m |
| 2026-05-26 | PUTT81 | - | May 26, 16:20 UTC | May 26, 17:59 UTC | 1h 40m |
| 2026-05-26 | PUTT81 | - | May 26, 15:05 UTC | May 26, 15:20 UTC | 15m |
| 2026-05-15 | PUTT41 | - | May 15, 20:25 UTC | May 15, 20:45 UTC | 20m |
| 2026-05-15 | PUTT41 | - | May 15, 18:30 UTC | May 15, 18:40 UTC | 10m |
| 2026-05-13 | PUTT42 | HOP → HOP | May 13, 01:35 UTC | May 13, 02:55 UTC | 1h 20m |
| 2026-05-09 | PUTT81 | - | May 9, 22:55 UTC | May 10, 00:00 UTC | 1h 5m |
| 2026-05-09 | PUTT81 | - | May 9, 20:20 UTC | May 9, 22:00 UTC | 1h 40m |
| 2026-05-09 | PUTT81 | - | May 9, 18:20 UTC | May 9, 18:45 UTC | 25m |
| 2026-05-09 | PUTT81 | - | May 9, 15:25 UTC | May 9, 15:35 UTC | 10m |
| 2026-05-08 | PUTT81 | - | May 8, 04:29 UTC | May 8, 05:29 UTC | 1h 0m |
| 2026-05-08 | PUTT81 | - | May 8, 02:24 UTC | May 8, 02:44 UTC | 20m |
| 2026-05-04 | PUTT81 | - | May 4, 03:30 UTC | May 4, 05:20 UTC | 1h 50m |
| 2026-05-04 | PUTT81 | - | May 4, 03:15 UTC | May 4, 03:24 UTC | 10m |
| 2026-05-04 | PUTT81 | - | May 4, 02:15 UTC | May 4, 03:09 UTC | 55m |
| 2026-05-01 | PUTT82 | - | May 1, 20:10 UTC | May 1, 20:25 UTC | 15m |
| 2026-04-30 | JAGGY81 | - | Apr 30, 00:05 UTC | Apr 30, 00:20 UTC | 15m |
| 2026-04-29 | JAGGY81 | - | Apr 29, 18:50 UTC | Apr 29, 20:10 UTC | 1h 20m |
| 2026-04-29 | JAGGY81 | - | Apr 29, 16:45 UTC | Apr 29, 18:00 UTC | 1h 15m |
| 2026-04-13 | JAGGY51 | - | Apr 13, 20:35 UTC | Apr 13, 20:50 UTC | 15m |
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 04-03739 page for operator, model, and routing details .