sensors Mode-S transponder
4C066D
ICAO 24-bit transponder address · allocated to Serbia
Currently assigned to YU-BTN · CESSNA 525B Citation CJ3
- Hex
- 4C066D
- Octal
- 23003155
- Decimal
- 4,982,381
- Country
- RS
- Tail
- YU-BTN
- Type
- C25B
- Flights observed
- 50
- Distinct callsigns
- 1
- Country
- RS
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address 4C066D falls within the block assigned to Serbia (RS) by ICAO Annex 10, Volume III. Every aircraft registered in Serbia 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 |
|---|---|---|---|
| FUU543N | - | 50 | 2026-05-30 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | FUU543N | - | May 30, 08:30 UTC | May 30, 10:25 UTC | 1h 55m |
| 2026-05-29 | FUU543N | MAN → CIA | May 29, 10:10 UTC | May 29, 12:45 UTC | 2h 35m |
| 2026-05-28 | FUU543N | - | May 28, 16:15 UTC | May 28, 16:50 UTC | 35m |
| 2026-05-28 | FUU543N | - | May 28, 13:25 UTC | May 28, 15:20 UTC | 1h 55m |
| 2026-05-26 | FUU543N | - | May 26, 13:19 UTC | May 26, 14:30 UTC | 1h 10m |
| 2026-05-26 | FUU543N | - | May 26, 10:20 UTC | May 26, 11:15 UTC | 55m |
| 2026-05-25 | FUU543N | ATH → BEG | May 25, 19:05 UTC | May 25, 20:30 UTC | 1h 25m |
| 2026-05-23 | FUU543N | - | May 23, 19:20 UTC | May 24, 15:10 UTC | 19h 50m |
| 2026-05-23 | FUU543N | - | May 23, 18:30 UTC | May 24, 15:10 UTC | 20h 40m |
| 2026-05-23 | FUU543N | - | May 23, 14:35 UTC | May 23, 16:30 UTC | 1h 55m |
| 2026-05-22 | FUU543N | - | May 22, 17:35 UTC | May 22, 18:45 UTC | 1h 10m |
| 2026-05-22 | FUU543N | - | May 22, 14:55 UTC | May 22, 16:40 UTC | 1h 45m |
| 2026-05-22 | FUU543N | - | May 22, 13:05 UTC | May 22, 13:40 UTC | 35m |
| 2026-05-21 | FUU543N | - | May 21, 15:10 UTC | May 21, 17:25 UTC | 2h 15m |
| 2026-05-21 | FUU543N | ATH → CIA | May 21, 12:15 UTC | May 21, 14:00 UTC | 1h 45m |
| 2026-05-21 | FUU543N | BEG → ATH | May 21, 08:35 UTC | May 21, 10:00 UTC | 1h 25m |
| 2026-05-17 | FUU543N | IBZ → BEG | May 17, 16:01 UTC | May 17, 18:35 UTC | 2h 35m |
| 2026-05-14 | FUU543N | BEG → IBZ | May 14, 07:20 UTC | May 14, 10:20 UTC | 3h 0m |
| 2026-05-11 | FUU543N | - | May 11, 15:15 UTC | May 11, 16:05 UTC | 50m |
| 2026-05-11 | FUU543N | - | May 11, 13:35 UTC | May 11, 14:00 UTC | 25m |
| 2026-05-09 | FUU543N | ATH → BEG | May 9, 11:30 UTC | May 9, 13:05 UTC | 1h 35m |
| 2026-05-09 | FUU543N | BEG → ATH | May 9, 07:15 UTC | May 9, 08:35 UTC | 1h 20m |
| 2026-05-07 | FUU543N | MAD → BEG | May 7, 20:45 UTC | May 7, 23:29 UTC | 2h 45m |
| 2026-05-04 | FUU543N | - | May 4, 08:55 UTC | May 4, 09:50 UTC | 55m |
| 2026-05-03 | FUU543N | - | May 3, 15:40 UTC | May 3, 18:09 UTC | 2h 30m |
| 2026-05-03 | FUU543N | - | May 3, 10:10 UTC | May 3, 11:20 UTC | 1h 10m |
| 2026-05-03 | FUU543N | - | May 3, 08:20 UTC | May 3, 09:05 UTC | 45m |
| 2026-05-02 | FUU543N | - | May 2, 11:40 UTC | May 2, 14:00 UTC | 2h 20m |
| 2026-05-01 | FUU543N | - | May 1, 09:15 UTC | May 1, 12:20 UTC | 3h 5m |
| 2026-04-29 | FUU543N | - | Apr 29, 12:10 UTC | Apr 29, 13:35 UTC | 1h 25m |
| 2026-04-29 | FUU543N | MLA → FMO | Apr 29, 08:10 UTC | Apr 29, 11:10 UTC | 3h 1m |
| 2026-04-28 | FUU543N | - | Apr 28, 06:20 UTC | Apr 28, 09:05 UTC | 2h 45m |
| 2026-04-27 | FUU543N | NWI → FMO | Apr 27, 16:00 UTC | Apr 27, 16:50 UTC | 50m |
| 2026-04-26 | FUU543N | NCE → NWI | Apr 26, 16:25 UTC | Apr 26, 18:20 UTC | 1h 55m |
| 2026-04-25 | FUU543N | DBV → NCE | Apr 25, 15:40 UTC | Apr 25, 17:15 UTC | 1h 35m |
| 2026-04-25 | FUU543N | - | Apr 25, 14:05 UTC | Apr 25, 14:40 UTC | 35m |
| 2026-04-25 | FUU543N | - | Apr 25, 13:05 UTC | Apr 25, 13:30 UTC | 25m |
| 2026-04-25 | FUU543N | - | Apr 25, 10:45 UTC | Apr 25, 11:20 UTC | 35m |
| 2026-04-22 | FUU543N | NOC → BEG | Apr 22, 09:15 UTC | Apr 22, 12:40 UTC | 3h 25m |
| 2026-04-22 | FUU543N | - | Apr 22, 07:05 UTC | Apr 22, 08:15 UTC | 1h 10m |
| 2026-04-19 | FUU543N | FRL → LTN | Apr 19, 18:50 UTC | Apr 19, 21:10 UTC | 2h 20m |
| 2026-04-19 | FUU543N | - | Apr 19, 16:30 UTC | Apr 19, 17:15 UTC | 45m |
| 2026-04-18 | FUU543N | - | Apr 18, 11:40 UTC | Apr 18, 13:50 UTC | 2h 10m |
| 2026-04-17 | FUU543N | - | Apr 17, 15:20 UTC | Apr 17, 17:15 UTC | 1h 55m |
| 2026-04-17 | FUU543N | - | Apr 17, 14:25 UTC | Apr 17, 15:15 UTC | 49m |
| 2026-04-17 | FUU543N | LBA → DUB | Apr 17, 12:25 UTC | Apr 17, 13:05 UTC | 40m |
| 2026-04-16 | FUU543N | - | Apr 16, 17:15 UTC | Apr 16, 18:05 UTC | 50m |
| 2026-04-16 | FUU543N | - | Apr 16, 16:20 UTC | Apr 16, 17:10 UTC | 50m |
| 2026-04-13 | FUU543N | - | Apr 13, 18:15 UTC | Apr 13, 19:35 UTC | 1h 20m |
| 2026-04-13 | FUU543N | MAN → NHT | Apr 13, 16:40 UTC | Apr 13, 17:15 UTC | 35m |
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 YU-BTN page for operator, model, and routing details .