sensors Mode-S transponder
503900
ICAO 24-bit transponder address
- Hex
- 503900
- Octal
- 24034400
- Decimal
- 5,257,472
- Flights observed
- 5
- Distinct callsigns
- 3
- Country
- -
- Last broadcast
- 1h ago
Last known position
Callsign history 3 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| MLH8452 | - | 2 | 2026-06-14 |
| NVD8530 | Nordic Solutions | 1 | 2026-06-16 |
| NVD8321 | Nordic Solutions | 1 | 2026-06-25 |
Recent flights last 5
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-25 | NVD8321 | VNO → HER | Jun 25, 01:50 UTC | Jun 25, 01:59 UTC | 10m |
| 2026-06-16 | NVD8530 | AYT → VNO | Jun 16, 18:09 UTC | Jun 16, 18:35 UTC | 25m |
| 2026-06-14 | MLH8452 | - | Jun 14, 16:35 UTC | Jun 14, 16:50 UTC | 15m |
| 2026-06-13 | MLH8452 | - | Jun 13, 18:20 UTC | Jun 14, 16:50 UTC | 22h 30m |
| 2026-06-09 | - | - | Jun 9, 19:40 UTC | Jun 9, 20:05 UTC | 25m |
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.