sensors Mode-S transponder
AE1239
ICAO 24-bit transponder address
Currently assigned to 04-4129 · Boeing C-17A Globemaster III
- Hex
- AE1239
- Octal
- 53411071
- Decimal
- 11,407,929
- Tail
- 04-4129
- Type
- C17
- Flights observed
- 3
- Distinct callsigns
- 1
- Country
- -
- Last broadcast
- 18h ago
Last known position
Callsign history 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| RCH429 | Air Mobility Command | 3 | 2026-04-14 |
Recent flights last 3
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 04-4129 page for operator, model, and routing details .