sensors Mode-S transponder
4A524B
ICAO 24-bit transponder address · allocated to Romania
Currently assigned to YR-TRK · CESSNA 525C Citation CJ4
- Hex
- 4A524B
- Octal
- 22451113
- Decimal
- 4,870,731
- Country
- RO
- Tail
- YR-TRK
- Type
- C25C
- Flights observed
- 58
- Distinct callsigns
- 20
- Country
- RO
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 4A524B falls within the block assigned to Romania (RO) by ICAO Annex 10, Volume III. Every aircraft registered in Romania 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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| TOY531 | - | 3 | 2026-05-15 |
| TOY527 | - | 3 | 2026-05-13 |
| TOY558 | - | 2 | 2026-05-29 |
| TOY540 | - | 2 | 2026-05-20 |
| TOY534 | - | 2 | 2026-04-17 |
| TOY532 | - | 2 | 2026-05-16 |
| TOY526 | - | 2 | 2026-05-13 |
| TOY518 | - | 2 | 2026-05-09 |
| TOY563 | - | 1 | 2026-05-31 |
| TOY562 | - | 1 | 2026-05-31 |
| TOY561 | - | 1 | 2026-05-30 |
| TOY560 | - | 1 | 2026-05-30 |
| TOY557 | - | 1 | 2026-05-29 |
| TOY556 | - | 1 | 2026-05-28 |
| TOY555 | - | 1 | 2026-05-28 |
| TOY554 | - | 1 | 2026-04-27 |
| TOY550 | - | 1 | 2026-05-25 |
| TOY548 | - | 1 | 2026-04-24 |
| TOY547 | - | 1 | 2026-04-24 |
| TOY546 | - | 1 | 2026-05-23 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-01 | TOY502 | - | Jun 1, 11:00 UTC | Jun 1, 12:45 UTC | 1h 45m |
| 2026-05-31 | TOY501 | - | May 31, 17:45 UTC | May 31, 19:15 UTC | 1h 30m |
| 2026-05-31 | TOY563 | - | May 31, 14:50 UTC | May 31, 16:30 UTC | 1h 40m |
| 2026-05-31 | TOY562 | - | May 31, 00:00 UTC | May 31, 00:55 UTC | 55m |
| 2026-05-30 | TOY561 | - | May 30, 21:20 UTC | May 30, 23:15 UTC | 1h 55m |
| 2026-05-30 | TOY560 | - | May 30, 15:30 UTC | May 30, 18:50 UTC | 3h 20m |
| 2026-05-29 | TOY558 | - | May 29, 14:05 UTC | May 29, 15:55 UTC | 1h 51m |
| 2026-05-29 | TOY557 | - | May 29, 07:15 UTC | May 29, 09:05 UTC | 1h 50m |
| 2026-05-28 | TOY556 | - | May 28, 14:00 UTC | May 28, 16:45 UTC | 2h 45m |
| 2026-05-28 | TOY555 | - | May 28, 07:55 UTC | May 28, 11:20 UTC | 3h 25m |
| 2026-05-25 | TOY550 | - | May 25, 11:30 UTC | May 25, 13:25 UTC | 1h 55m |
| 2026-05-23 | TOY546 | - | May 23, 12:55 UTC | May 23, 14:30 UTC | 1h 35m |
| 2026-05-23 | TOY545 | - | May 23, 08:50 UTC | May 23, 10:30 UTC | 1h 40m |
| 2026-05-22 | TOY544 | - | May 22, 13:10 UTC | May 22, 15:05 UTC | 1h 55m |
| 2026-05-20 | TOY540 | - | May 20, 17:20 UTC | May 20, 19:20 UTC | 2h 0m |
| 2026-05-20 | TOY539A | - | May 20, 13:35 UTC | May 20, 14:35 UTC | 1h 0m |
| 2026-05-20 | TOY539 | - | May 20, 10:55 UTC | May 20, 12:30 UTC | 1h 35m |
| 2026-05-19 | TOY538 | - | May 19, 09:40 UTC | May 19, 11:20 UTC | 1h 40m |
| 2026-05-19 | TOY537 | - | May 19, 05:30 UTC | May 19, 06:20 UTC | 50m |
| 2026-05-17 | TOY535 | - | May 17, 15:20 UTC | May 17, 18:15 UTC | 2h 55m |
| 2026-05-17 | TOY534A | BEG → JMK | May 17, 13:05 UTC | May 17, 14:30 UTC | 1h 25m |
| 2026-05-16 | TOY532 | - | May 16, 12:35 UTC | May 16, 14:11 UTC | 1h 35m |
| 2026-05-16 | TOY531A | - | May 16, 09:31 UTC | May 16, 09:51 UTC | 20m |
| 2026-05-15 | TOY531 | - | May 15, 15:05 UTC | May 15, 17:45 UTC | 2h 40m |
| 2026-05-15 | TOY530A | - | May 15, 09:40 UTC | May 15, 10:40 UTC | 1h 0m |
| 2026-05-15 | TOY530 | - | May 15, 07:10 UTC | May 15, 08:30 UTC | 1h 20m |
| 2026-05-14 | TOY529A | MST → BBU | May 14, 15:25 UTC | May 14, 18:00 UTC | 2h 35m |
| 2026-05-14 | TOY529 | - | May 14, 11:20 UTC | May 14, 14:40 UTC | 3h 20m |
| 2026-05-14 | TOY528 | ATH → JMK | May 14, 09:10 UTC | May 14, 09:35 UTC | 25m |
| 2026-05-13 | TOY527 | - | May 13, 14:51 UTC | May 13, 16:55 UTC | 2h 5m |
| 2026-05-13 | TOY526 | - | May 13, 09:05 UTC | May 13, 10:45 UTC | 1h 40m |
| 2026-05-12 | TOY525 | - | May 12, 06:10 UTC | May 12, 07:50 UTC | 1h 40m |
| 2026-05-12 | TOY524 | WRO → BER | May 12, 04:35 UTC | May 12, 05:10 UTC | 35m |
| 2026-05-10 | TOY520 | - | May 10, 16:34 UTC | May 10, 20:00 UTC | 3h 25m |
| 2026-05-09 | TOY518 | - | May 9, 10:50 UTC | May 9, 12:00 UTC | 1h 10m |
| 2026-05-09 | TOY518 | - | May 9, 07:40 UTC | May 9, 10:10 UTC | 2h 30m |
| 2026-05-08 | TOY516 | - | May 8, 15:10 UTC | May 8, 15:55 UTC | 45m |
| 2026-05-07 | TOY514 | - | May 7, 16:40 UTC | May 7, 17:40 UTC | 1h 0m |
| 2026-05-05 | TOY510 | - | May 5, 08:05 UTC | May 5, 09:15 UTC | 1h 10m |
| 2026-05-04 | TOY509 | - | May 4, 16:50 UTC | May 4, 17:45 UTC | 55m |
| 2026-05-04 | TOY508 | - | May 4, 13:30 UTC | May 4, 15:45 UTC | 2h 15m |
| 2026-05-03 | TOY506 | - | May 3, 12:15 UTC | May 3, 13:55 UTC | 1h 40m |
| 2026-05-03 | TOY505 | OTP → RMI | May 3, 08:10 UTC | May 3, 09:40 UTC | 1h 30m |
| 2026-05-02 | TOY504 | - | May 2, 11:40 UTC | May 2, 13:15 UTC | 1h 35m |
| 2026-04-29 | TOY558 | - | Apr 29, 06:25 UTC | Apr 29, 07:50 UTC | 1h 25m |
| 2026-04-27 | TOY554 | - | Apr 27, 05:50 UTC | Apr 27, 07:35 UTC | 1h 45m |
| 2026-04-24 | TOY548 | - | Apr 24, 12:20 UTC | Apr 24, 14:10 UTC | 1h 50m |
| 2026-04-24 | TOY547 | ZRH → GHV | Apr 24, 09:05 UTC | Apr 24, 11:05 UTC | 2h 0m |
| 2026-04-19 | TOY540 | BER → ZRH | Apr 19, 15:25 UTC | Apr 19, 16:40 UTC | 1h 15m |
| 2026-04-17 | TOY534 | - | Apr 17, 15:20 UTC | Apr 17, 16:00 UTC | 40m |
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 YR-TRK page for operator, model, and routing details .