sensors Mode-S transponder
D5500F
ICAO 24-bit transponder address
- Hex
- D5500F
- Octal
- 65250017
- Decimal
- 13,979,663
- Flights observed
- 1
- Distinct callsigns
- 0
- Country
- -
- Last broadcast
- 27d ago
Last known position
Recent flights last 1
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-12 | - | - | Jul 12, 17:35 UTC | Jul 12, 18:10 UTC | 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.