sensors Mode-S transponder
4B2A49
ICAO 24-bit transponder address · allocated to Switzerland
- Hex
- 4B2A49
- Octal
- 22625111
- Decimal
- 4,926,025
- Country
- CH
- Flights observed
- 26
- Distinct callsigns
- 10
- Country
- CH
- Last broadcast
- Jul 26, 14:45 UTC
Last known position
Country allocation
The ICAO 24-bit address 4B2A49 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 10 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| THY3HJ | Turkish Airlines | 3 | 2026-07-26 |
| THY2GR | Turkish Airlines | 2 | 2026-07-23 |
| THY2AL | Turkish Airlines | 2 | 2026-06-08 |
| THY8NC | Turkish Airlines | 1 | 2026-06-09 |
| THY8AV | Turkish Airlines | 1 | 2026-07-25 |
| THY7JT | Turkish Airlines | 1 | 2026-06-06 |
| THY4TJ | Turkish Airlines | 1 | 2026-05-23 |
| THY4KR | - | 1 | 2026-06-26 |
| THY2CU | Turkish Airlines | 1 | 2026-06-22 |
| THY1KB | - | 1 | 2026-07-14 |
Recent flights last 26
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | THY3HJ | AYT → VKO | Jul 26, 09:15 UTC | Jul 26, 14:45 UTC | 5h 30m |
| 2026-07-25 | THY3HJ | AYT → VKO | Jul 25, 11:25 UTC | Jul 26, 09:35 UTC | 22h 11m |
| 2026-07-25 | THY8AV | IST → PRG | Jul 25, 07:00 UTC | Jul 25, 11:25 UTC | 4h 25m |
| 2026-07-23 | THY2GR | AMS → IST | Jul 23, 21:15 UTC | Jul 23, 21:30 UTC | 15m |
| 2026-07-23 | THY2GR | AMS → IST | Jul 23, 01:25 UTC | Jul 23, 21:30 UTC | 20h 5m |
| 2026-07-22 | - | - | Jul 22, 20:25 UTC | Jul 23, 01:45 UTC | 5h 20m |
| 2026-07-19 | - | - | Jul 19, 07:00 UTC | Jul 19, 20:00 UTC | 13h 0m |
| 2026-07-14 | THY1KB | - | Jul 14, 07:10 UTC | Jul 14, 21:15 UTC | 14h 5m |
| 2026-06-27 | - | - | Jun 27, 19:00 UTC | Jun 28, 06:40 UTC | 11h 40m |
| 2026-06-26 | THY4KR | - | Jun 26, 01:29 UTC | Jun 26, 07:50 UTC | 6h 20m |
| 2026-06-23 | THY3HJ | AYT → VKO | Jun 23, 20:10 UTC | Jun 24, 07:59 UTC | 11h 50m |
| 2026-06-22 | THY2CU | IST → HTY | Jun 22, 19:44 UTC | Jun 22, 20:04 UTC | 20m |
| 2026-06-18 | - | - | Jun 18, 21:05 UTC | Jun 19, 01:59 UTC | 4h 54m |
| 2026-06-15 | - | - | Jun 15, 20:00 UTC | Jun 15, 20:10 UTC | 10m |
| 2026-06-11 | - | - | Jun 11, 02:25 UTC | Jun 11, 22:05 UTC | 19h 40m |
| 2026-06-10 | - | - | Jun 10, 19:40 UTC | Jun 11, 14:25 UTC | 18h 45m |
| 2026-06-10 | - | - | Jun 10, 13:05 UTC | Jun 11, 02:30 UTC | 13h 25m |
| 2026-06-09 | THY8NC | VIE → ASR | Jun 9, 01:20 UTC | Jun 9, 07:20 UTC | 6h 0m |
| 2026-06-08 | THY2AL | AYT → LED | Jun 8, 06:55 UTC | Jun 9, 01:30 UTC | 18h 35m |
| 2026-06-08 | THY2AL | AYT → LED | Jun 8, 00:10 UTC | Jun 8, 06:55 UTC | 6h 45m |
| 2026-06-06 | THY7JT | AYT → VKO | Jun 6, 08:15 UTC | Jun 6, 08:25 UTC | 10m |
| 2026-06-05 | - | - | Jun 5, 01:05 UTC | Jun 5, 01:15 UTC | 10m |
| 2026-05-30 | - | - | May 30, 19:50 UTC | May 30, 20:10 UTC | 20m |
| 2026-05-23 | THY4TJ | MSR → IST | May 23, 19:45 UTC | May 23, 20:10 UTC | 25m |
| 2026-05-15 | - | - | May 15, 02:10 UTC | May 15, 02:25 UTC | 15m |
| 2026-05-14 | - | - | May 14, 07:05 UTC | May 15, 02:25 UTC | 19h 20m |
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.