sensors Mode-S transponder
4B2A59
ICAO 24-bit transponder address · allocated to Switzerland
Currently assigned to HB-QAZ · Schroeder Fire Balloons 40/24 Hot Air Balloon
- Hex
- 4B2A59
- Octal
- 22625131
- Decimal
- 4,926,041
- Country
- CH
- Tail
- HB-QAZ
- Type
- BALL
- Flights observed
- 12
- Distinct callsigns
- 8
- Country
- CH
- Last broadcast
- Jul 17, 14:30 UTC
Last known position
Country allocation
The ICAO 24-bit address 4B2A59 falls within the block assigned to Switzerland (CH) by ICAO Annex 10, Volume III. Every aircraft registered in Switzerland receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.
Callsign history 8 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| THY8CD | Turkish Airlines | 1 | 2026-06-04 |
| THY6YD | - | 1 | 2026-07-12 |
| THY5LG | Turkish Airlines | 1 | 2026-06-23 |
| THY4HA | - | 1 | 2026-06-17 |
| THY3009 | - | 1 | 2026-07-17 |
| THY2DC | Turkish Airlines | 1 | 2026-06-11 |
| THY1SL | Turkish Airlines | 1 | 2026-05-20 |
| THY1JR | Turkish Airlines | 1 | 2026-06-01 |
Recent flights last 12
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | THY3009 | - | Jul 17, 14:15 UTC | Jul 17, 14:30 UTC | 15m |
| 2026-07-12 | THY6YD | - | Jul 12, 12:55 UTC | Jul 12, 13:10 UTC | 15m |
| 2026-07-08 | - | - | Jul 8, 02:00 UTC | Jul 8, 02:15 UTC | 15m |
| 2026-06-23 | THY5LG | BJV → LED | Jun 23, 07:35 UTC | Jun 23, 07:49 UTC | 15m |
| 2026-06-17 | THY4HA | - | Jun 17, 19:25 UTC | Jun 17, 19:55 UTC | 30m |
| 2026-06-14 | - | - | Jun 14, 14:00 UTC | Jun 14, 14:15 UTC | 15m |
| 2026-06-12 | - | - | Jun 12, 19:35 UTC | Jun 12, 19:50 UTC | 15m |
| 2026-06-11 | THY2DC | LED → BJV | Jun 11, 14:50 UTC | Jun 11, 15:10 UTC | 20m |
| 2026-06-04 | THY8CD | AYT → VKO | Jun 4, 19:05 UTC | Jun 4, 19:20 UTC | 15m |
| 2026-06-01 | THY1JR | IST → STR | Jun 1, 00:50 UTC | Jun 1, 07:35 UTC | 6h 45m |
| 2026-05-23 | - | - | May 23, 10:45 UTC | May 23, 10:55 UTC | 10m |
| 2026-05-20 | THY1SL | IST → ECN | May 20, 01:05 UTC | May 20, 12:05 UTC | 11h 1m |
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 HB-QAZ page for operator, model, and routing details .