sensors Mode-S transponder
4984FB
ICAO 24-bit transponder address · allocated to Czech Republic
- Hex
- 4984FB
- Octal
- 22302373
- Decimal
- 4,818,171
- Country
- CZ
- Flights observed
- 39
- Distinct callsigns
- 14
- Country
- CZ
- Last broadcast
- 11h ago
Last known position
Country allocation
The ICAO 24-bit address 4984FB 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 14 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| BTLE81 | - | 10 | 2026-07-09 |
| BTLE21 | - | 5 | 2026-07-21 |
| BTLE91 | - | 4 | 2026-07-09 |
| BTLE11 | - | 4 | 2026-05-06 |
| BTLE41 | - | 3 | 2026-05-26 |
| BTLE13 | - | 3 | 2026-07-21 |
| BTLE83 | - | 2 | 2026-05-27 |
| BTLE32 | - | 2 | 2026-07-09 |
| BTLE93 | - | 1 | 2026-06-12 |
| BTLE92 | - | 1 | 2026-07-16 |
| BTLE84 | - | 1 | 2026-06-24 |
| BTLE35 | - | 1 | 2026-05-25 |
| BTLE33 | - | 1 | 2026-04-22 |
| BTLE31 | - | 1 | 2026-05-26 |
Recent flights last 39
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-21 | BTLE21 | - | Jul 21, 13:45 UTC | Jul 21, 14:50 UTC | 1h 5m |
| 2026-07-21 | BTLE13 | - | Jul 21, 11:30 UTC | Jul 21, 12:30 UTC | 1h 0m |
| 2026-07-16 | BTLE92 | - | Jul 16, 09:20 UTC | Jul 16, 10:15 UTC | 55m |
| 2026-07-09 | BTLE32 | - | Jul 9, 15:00 UTC | Jul 9, 15:55 UTC | 55m |
| 2026-07-09 | BTLE21 | - | Jul 9, 13:00 UTC | Jul 9, 13:55 UTC | 55m |
| 2026-07-09 | BTLE91 | - | Jul 9, 09:25 UTC | Jul 9, 10:15 UTC | 50m |
| 2026-07-09 | BTLE81 | - | Jul 9, 07:25 UTC | Jul 9, 08:10 UTC | 45m |
| 2026-07-07 | BTLE81 | - | Jul 7, 09:05 UTC | Jul 7, 10:00 UTC | 55m |
| 2026-06-29 | BTLE81 | - | Jun 29, 07:59 UTC | Jun 29, 09:10 UTC | 1h 10m |
| 2026-06-24 | BTLE84 | PED → PED | Jun 24, 07:24 UTC | Jun 24, 07:34 UTC | 10m |
| 2026-06-22 | BTLE81 | - | Jun 22, 10:10 UTC | Jun 22, 11:24 UTC | 1h 15m |
| 2026-06-12 | BTLE13 | - | Jun 12, 11:05 UTC | Jun 12, 12:00 UTC | 55m |
| 2026-06-12 | BTLE93 | PED → PED | Jun 12, 09:20 UTC | Jun 12, 10:15 UTC | 55m |
| 2026-05-28 | BTLE91 | - | May 28, 09:35 UTC | May 28, 10:30 UTC | 55m |
| 2026-05-28 | BTLE81 | PED → PED | May 28, 07:10 UTC | May 28, 08:10 UTC | 1h 0m |
| 2026-05-27 | BTLE83 | - | May 27, 07:35 UTC | May 27, 08:35 UTC | 1h 0m |
| 2026-05-26 | BTLE41 | - | May 26, 18:10 UTC | May 26, 18:59 UTC | 50m |
| 2026-05-26 | BTLE31 | - | May 26, 15:24 UTC | May 26, 16:24 UTC | 1h 0m |
| 2026-05-26 | BTLE21 | - | May 26, 13:54 UTC | May 26, 14:35 UTC | 40m |
| 2026-05-25 | BTLE35 | - | May 25, 17:30 UTC | May 25, 18:30 UTC | 1h 0m |
| 2026-05-25 | BTLE21 | PED → PED | May 25, 14:50 UTC | May 25, 16:05 UTC | 1h 15m |
| 2026-05-25 | BTLE13 | - | May 25, 12:30 UTC | May 25, 13:20 UTC | 50m |
| 2026-05-25 | BTLE83 | - | May 25, 08:15 UTC | May 25, 09:15 UTC | 1h 0m |
| 2026-05-06 | BTLE11 | - | May 6, 11:15 UTC | May 6, 12:25 UTC | 1h 10m |
| 2026-05-06 | BTLE81 | - | May 6, 07:35 UTC | May 6, 08:50 UTC | 1h 15m |
| 2026-04-29 | BTLE81 | PED → PED | Apr 29, 08:15 UTC | Apr 29, 09:10 UTC | 56m |
| 2026-04-28 | BTLE32 | - | Apr 28, 17:00 UTC | Apr 28, 17:55 UTC | 55m |
| 2026-04-28 | BTLE11 | - | Apr 28, 12:00 UTC | Apr 28, 13:05 UTC | 1h 5m |
| 2026-04-28 | BTLE91 | - | Apr 28, 10:15 UTC | Apr 28, 11:00 UTC | 45m |
| 2026-04-28 | BTLE81 | - | Apr 28, 07:55 UTC | Apr 28, 09:00 UTC | 1h 5m |
| 2026-04-27 | BTLE41 | - | Apr 27, 17:00 UTC | Apr 27, 18:00 UTC | 1h 0m |
| 2026-04-23 | BTLE11 | - | Apr 23, 12:10 UTC | Apr 23, 13:15 UTC | 1h 5m |
| 2026-04-23 | BTLE91 | - | Apr 23, 09:15 UTC | Apr 23, 10:05 UTC | 50m |
| 2026-04-23 | BTLE81 | - | Apr 23, 07:05 UTC | Apr 23, 08:20 UTC | 1h 15m |
| 2026-04-22 | BTLE41 | - | Apr 22, 17:10 UTC | Apr 22, 18:15 UTC | 1h 5m |
| 2026-04-22 | BTLE33 | - | Apr 22, 15:00 UTC | Apr 22, 16:00 UTC | 1h 0m |
| 2026-04-22 | BTLE21 | - | Apr 22, 12:10 UTC | Apr 22, 13:00 UTC | 50m |
| 2026-04-22 | BTLE11 | - | Apr 22, 10:10 UTC | Apr 22, 11:30 UTC | 1h 20m |
| 2026-04-22 | BTLE81 | - | Apr 22, 07:30 UTC | Apr 22, 08:01 UTC | 30m |
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.