sensors Mode-S transponder
49C30B
ICAO 24-bit transponder address · allocated to Czech Republic
Currently assigned to OK-AUR21 · DIRECT FLY Alto
- Hex
- 49C30B
- Octal
- 22341413
- Decimal
- 4,834,059
- Country
- CZ
- Tail
- OK-AUR21
- Type
- ALTO
- Flights observed
- 39
- Distinct callsigns
- 1
- Country
- CZ
- Last broadcast
- Jul 26, 18:35 UTC
Last known position
Country allocation
The ICAO 24-bit address 49C30B 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| OKAUR21 | - | 39 | 2026-07-26 |
Recent flights last 39
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | OKAUR21 | - | Jul 26, 17:30 UTC | Jul 26, 18:35 UTC | 1h 5m |
| 2026-07-25 | OKAUR21 | - | Jul 25, 05:50 UTC | Jul 25, 09:40 UTC | 3h 50m |
| 2026-07-22 | OKAUR21 | - | Jul 22, 18:15 UTC | Jul 22, 18:55 UTC | 40m |
| 2026-07-20 | OKAUR21 | - | Jul 20, 18:10 UTC | Jul 20, 18:45 UTC | 35m |
| 2026-07-18 | OKAUR21 | - | Jul 18, 17:40 UTC | Jul 18, 19:00 UTC | 1h 20m |
| 2026-07-12 | OKAUR21 | - | Jul 12, 18:30 UTC | Jul 12, 19:01 UTC | 30m |
| 2026-06-27 | OKAUR21 | - | Jun 27, 02:39 UTC | Jun 27, 03:44 UTC | 1h 5m |
| 2026-06-26 | OKAUR21 | - | Jun 26, 03:54 UTC | Jun 26, 04:50 UTC | 55m |
| 2026-06-23 | OKAUR21 | - | Jun 23, 15:59 UTC | Jun 23, 16:09 UTC | 10m |
| 2026-06-19 | OKAUR21 | - | Jun 19, 18:20 UTC | Jun 19, 18:59 UTC | 40m |
| 2026-06-15 | OKAUR21 | - | Jun 15, 17:30 UTC | Jun 15, 17:59 UTC | 30m |
| 2026-06-13 | OKAUR21 | - | Jun 13, 18:40 UTC | Jun 13, 19:15 UTC | 35m |
| 2026-06-08 | OKAUR21 | - | Jun 8, 17:40 UTC | Jun 8, 19:05 UTC | 1h 25m |
| 2026-06-06 | OKAUR21 | - | Jun 6, 18:25 UTC | Jun 6, 19:04 UTC | 40m |
| 2026-06-04 | OKAUR21 | - | Jun 4, 17:35 UTC | Jun 4, 18:50 UTC | 1h 15m |
| 2026-06-02 | OKAUR21 | - | Jun 2, 17:45 UTC | Jun 2, 18:20 UTC | 35m |
| 2026-05-30 | OKAUR21 | - | May 30, 15:20 UTC | May 30, 15:45 UTC | 25m |
| 2026-05-30 | OKAUR21 | - | May 30, 14:05 UTC | May 30, 14:25 UTC | 20m |
| 2026-05-26 | OKAUR21 | - | May 26, 17:39 UTC | May 26, 18:40 UTC | 1h 0m |
| 2026-05-24 | OKAUR21 | - | May 24, 08:05 UTC | May 24, 09:05 UTC | 1h 0m |
| 2026-05-24 | OKAUR21 | - | May 24, 06:00 UTC | May 24, 07:15 UTC | 1h 15m |
| 2026-05-23 | OKAUR21 | - | May 23, 05:40 UTC | May 23, 05:50 UTC | 10m |
| 2026-05-23 | OKAUR21 | - | May 23, 04:55 UTC | May 23, 05:05 UTC | 10m |
| 2026-05-22 | OKAUR21 | - | May 22, 18:10 UTC | May 22, 18:35 UTC | 25m |
| 2026-05-20 | OKAUR21 | - | May 20, 17:55 UTC | May 20, 18:30 UTC | 35m |
| 2026-05-10 | OKAUR21 | - | May 10, 17:30 UTC | May 10, 18:25 UTC | 55m |
| 2026-05-07 | OKAUR21 | - | May 7, 17:50 UTC | May 7, 18:30 UTC | 40m |
| 2026-05-02 | OKAUR21 | - | May 2, 17:45 UTC | May 2, 18:05 UTC | 20m |
| 2026-05-01 | OKAUR21 | - | May 1, 17:30 UTC | May 1, 17:50 UTC | 20m |
| 2026-05-01 | OKAUR21 | - | May 1, 14:55 UTC | May 1, 15:10 UTC | 15m |
| 2026-05-01 | OKAUR21 | - | May 1, 09:50 UTC | May 1, 10:00 UTC | 10m |
| 2026-05-01 | OKAUR21 | - | May 1, 08:45 UTC | May 1, 09:05 UTC | 20m |
| 2026-04-27 | OKAUR21 | - | Apr 27, 16:35 UTC | Apr 27, 18:00 UTC | 1h 25m |
| 2026-04-19 | OKAUR21 | - | Apr 19, 08:55 UTC | Apr 19, 09:05 UTC | 10m |
| 2026-04-19 | OKAUR21 | - | Apr 19, 06:40 UTC | Apr 19, 08:05 UTC | 1h 25m |
| 2026-04-18 | OKAUR21 | - | Apr 18, 17:50 UTC | Apr 18, 18:15 UTC | 25m |
| 2026-04-18 | OKAUR21 | - | Apr 18, 07:25 UTC | Apr 18, 08:30 UTC | 1h 5m |
| 2026-04-18 | OKAUR21 | - | Apr 18, 07:00 UTC | Apr 18, 07:20 UTC | 20m |
| 2026-04-17 | OKAUR21 | - | Apr 17, 15:00 UTC | Apr 17, 15:15 UTC | 15m |
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-AUR21 page for operator, model, and routing details .