sensors Mode-S transponder
49D403
ICAO 24-bit transponder address · allocated to Czech Republic
Currently assigned to OK-TST · BOEING 737-800
- Hex
- 49D403
- Octal
- 22352003
- Decimal
- 4,838,403
- Country
- CZ
- Tail
- OK-TST
- Type
- B738
- Flights observed
- 38
- Distinct callsigns
- 6
- Country
- CZ
- Last broadcast
- 18d ago
Last known position
Country allocation
The ICAO 24-bit address 49D403 falls within the block assigned to Czech Republic (CZ) by ICAO Annex 10, Volume III. Every aircraft registered in Czech Republic 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 6 distinct
Recent flights last 38
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-12 | TVS122T | - | May 12, 05:15 UTC | May 12, 07:35 UTC | 2h 20m |
| 2026-05-05 | TVS789P | - | May 5, 21:40 UTC | May 6, 01:40 UTC | 4h 0m |
| 2026-04-28 | KNE265 | RUH → CAI | Apr 28, 18:50 UTC | Apr 28, 19:10 UTC | 20m |
| 2026-04-27 | KNE269 | RUH → CAI | Apr 27, 17:35 UTC | Apr 27, 18:00 UTC | 25m |
| 2026-04-25 | KNE300 | IST → RUH | Apr 25, 18:40 UTC | Apr 25, 20:20 UTC | 1h 40m |
| 2026-04-25 | KNE299 | RUH → IST | Apr 25, 14:55 UTC | Apr 25, 16:50 UTC | 1h 55m |
| 2026-04-24 | KNE299 | RUH → IST | Apr 24, 21:15 UTC | Apr 25, 16:50 UTC | 19h 35m |
| 2026-04-24 | KNE265 | RUH → CAI | Apr 24, 18:55 UTC | Apr 24, 19:20 UTC | 25m |
| 2026-04-23 | KNE300 | IST → RUH | Apr 23, 18:55 UTC | Apr 23, 20:45 UTC | 1h 50m |
| 2026-04-23 | KNE299 | RUH → IST | Apr 23, 14:55 UTC | Apr 23, 16:50 UTC | 1h 55m |
| 2026-04-22 | KNE300 | IST → RUH | Apr 22, 18:50 UTC | Apr 23, 16:50 UTC | 22h 0m |
| 2026-04-22 | KNE300 | IST → RUH | Apr 22, 18:40 UTC | Apr 23, 16:25 UTC | 21h 45m |
| 2026-04-22 | KNE299 | RUH → IST | Apr 22, 14:45 UTC | Apr 22, 16:15 UTC | 1h 30m |
| 2026-04-21 | KNE300 | IST → RUH | Apr 21, 18:50 UTC | Apr 22, 16:15 UTC | 21h 25m |
| 2026-04-21 | KNE300 | IST → RUH | Apr 21, 18:35 UTC | Apr 22, 16:15 UTC | 21h 40m |
| 2026-04-21 | KNE299 | RUH → IST | Apr 21, 14:40 UTC | Apr 21, 16:50 UTC | 2h 10m |
| 2026-04-20 | KNE299 | RUH → IST | Apr 20, 18:50 UTC | Apr 21, 16:50 UTC | 22h 0m |
| 2026-04-20 | KNE299 | RUH → IST | Apr 20, 14:50 UTC | Apr 21, 14:45 UTC | 23h 55m |
| 2026-04-20 | KNE299 | RUH → IST | Apr 20, 14:40 UTC | Apr 20, 20:15 UTC | 5h 35m |
| 2026-04-19 | KNE299 | RUH → IST | Apr 19, 20:50 UTC | Apr 20, 20:15 UTC | 23h 25m |
| 2026-04-19 | KNE300 | IST → RUH | Apr 19, 19:05 UTC | Apr 20, 16:20 UTC | 21h 15m |
| 2026-04-19 | KNE299 | RUH → IST | Apr 19, 15:55 UTC | Apr 19, 17:00 UTC | 1h 5m |
| 2026-04-17 | KNE265 | RUH → CAI | Apr 17, 19:05 UTC | Apr 17, 19:20 UTC | 15m |
| 2026-04-16 | KNE300 | IST → RUH | Apr 16, 19:15 UTC | Apr 16, 20:20 UTC | 1h 5m |
| 2026-04-16 | KNE300 | IST → RUH | Apr 16, 18:35 UTC | Apr 16, 19:10 UTC | 35m |
| 2026-04-16 | KNE299 | - | Apr 16, 15:15 UTC | Apr 16, 16:10 UTC | 55m |
| 2026-04-16 | KNE299 | - | Apr 16, 14:40 UTC | Apr 16, 15:10 UTC | 30m |
| 2026-04-15 | KNE300 | IST → RUH | Apr 15, 19:05 UTC | Apr 15, 20:25 UTC | 1h 20m |
| 2026-04-15 | KNE300 | IST → RUH | Apr 15, 18:45 UTC | Apr 15, 19:00 UTC | 15m |
| 2026-04-14 | KNE300 | IST → RUH | Apr 14, 20:55 UTC | Apr 14, 21:40 UTC | 45m |
| 2026-04-14 | KNE300 | IST → RUH | Apr 14, 20:00 UTC | Apr 14, 20:50 UTC | 50m |
| 2026-04-14 | KNE299 | - | Apr 14, 17:10 UTC | Apr 14, 18:05 UTC | 55m |
| 2026-04-13 | KNE300 | IST → RUH | Apr 13, 19:50 UTC | Apr 13, 20:35 UTC | 45m |
| 2026-04-13 | KNE300 | IST → RUH | Apr 13, 18:55 UTC | Apr 13, 20:10 UTC | 1h 15m |
| 2026-04-13 | KNE299 | - | Apr 13, 16:15 UTC | Apr 13, 16:35 UTC | 20m |
| 2026-04-13 | KNE299 | - | Apr 13, 15:50 UTC | Apr 13, 16:35 UTC | 45m |
| 2026-04-13 | KNE299 | - | Apr 13, 14:55 UTC | Apr 13, 16:15 UTC | 1h 20m |
| 2026-04-12 | KNE300 | IST → RUH | Apr 12, 19:25 UTC | Apr 12, 20:15 UTC | 50m |
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 OK-TST page for operator, model, and routing details .