sensors Mode-S transponder
AE1238
ICAO 24-bit transponder address
Currently assigned to 03-3127 · Boeing C-17A Globemaster III
- Hex
- AE1238
- Octal
- 53411070
- Decimal
- 11,407,928
- Tail
- 03-3127
- Type
- C17
- Flights observed
- 12
- Distinct callsigns
- 7
- Country
- -
- Last broadcast
- 1d ago
Last known position
Callsign history 7 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| RCH215 | - | 3 | 2026-07-10 |
| RCH864 | - | 2 | 2026-06-24 |
| RCH343 | Air Mobility Command | 2 | 2026-04-25 |
| RCH115 | - | 2 | 2026-06-28 |
| RCH293 | Air Mobility Command | 1 | 2026-06-06 |
| RCH238 | Air Mobility Command | 1 | 2026-04-21 |
| RCH195 | Air Mobility Command | 1 | 2026-05-01 |
Recent flights last 12
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-10 | RCH215 | - | Jul 10, 01:00 UTC | Jul 10, 01:20 UTC | 20m |
| 2026-07-09 | RCH215 | - | Jul 9, 01:45 UTC | Jul 9, 06:55 UTC | 5h 10m |
| 2026-07-08 | RCH215 | - | Jul 8, 14:10 UTC | Jul 8, 15:45 UTC | 1h 35m |
| 2026-06-28 | RCH115 | MHT → OZP | Jun 28, 11:04 UTC | Jun 28, 17:19 UTC | 6h 15m |
| 2026-06-28 | RCH115 | - | Jun 28, 03:50 UTC | Jun 28, 04:15 UTC | 25m |
| 2026-06-24 | RCH864 | - | Jun 24, 20:44 UTC | Jun 25, 03:54 UTC | 7h 10m |
| 2026-06-23 | RCH864 | - | Jun 23, 17:15 UTC | Jun 23, 21:45 UTC | 4h 30m |
| 2026-06-06 | RCH293 | UAB → RMS | Jun 6, 18:55 UTC | Jun 7, 03:10 UTC | 8h 15m |
| 2026-05-01 | RCH195 | RMS → RZE | May 1, 07:55 UTC | May 1, 17:45 UTC | 9h 50m |
| 2026-04-25 | RCH343 | RMS → RMS | Apr 25, 00:35 UTC | Apr 25, 09:05 UTC | 8h 30m |
| 2026-04-24 | RCH343 | RMS → RMS | Apr 24, 20:50 UTC | Apr 24, 21:55 UTC | 1h 5m |
| 2026-04-21 | RCH238 | MHZ → MHZ | Apr 21, 22:40 UTC | Apr 22, 05:15 UTC | 6h 35m |
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 03-3127 page for operator, model, and routing details .