sensors Mode-S transponder
44BF33
ICAO 24-bit transponder address · allocated to Belgium
Currently assigned to OO-OYS · CESSNA 510 Citation Mustang
- Hex
- 44BF33
- Octal
- 21137463
- Decimal
- 4,505,395
- Country
- BE
- Tail
- OO-OYS
- Type
- C510
- Flights observed
- 49
- Distinct callsigns
- 1
- Country
- BE
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 44BF33 falls within the block assigned to Belgium (BE) by ICAO Annex 10, Volume III. Every aircraft registered in Belgium 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 |
|---|---|---|---|
| OOOYS | - | 49 | 2026-06-14 |
Recent flights last 49
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-14 | OOOYS | - | Jun 14, 16:05 UTC | Jun 14, 18:05 UTC | 2h 0m |
| 2026-06-14 | OOOYS | - | Jun 14, 12:45 UTC | Jun 14, 14:30 UTC | 1h 45m |
| 2026-06-14 | OOOYS | - | Jun 14, 09:15 UTC | Jun 14, 10:55 UTC | 1h 40m |
| 2026-06-14 | OOOYS | - | Jun 14, 06:10 UTC | Jun 14, 07:35 UTC | 1h 25m |
| 2026-06-13 | OOOYS | - | Jun 13, 13:40 UTC | Jun 13, 15:30 UTC | 1h 50m |
| 2026-06-13 | OOOYS | - | Jun 13, 11:25 UTC | Jun 13, 12:40 UTC | 1h 15m |
| 2026-06-11 | OOOYS | - | Jun 11, 15:55 UTC | Jun 11, 16:35 UTC | 40m |
| 2026-06-11 | OOOYS | - | Jun 11, 05:30 UTC | Jun 11, 06:10 UTC | 40m |
| 2026-06-10 | OOOYS | LYN → ANR | Jun 10, 15:00 UTC | Jun 10, 16:20 UTC | 1h 20m |
| 2026-06-10 | OOOYS | ANR → LYN | Jun 10, 10:05 UTC | Jun 10, 11:25 UTC | 1h 20m |
| 2026-06-09 | OOOYS | - | Jun 9, 13:50 UTC | Jun 9, 14:35 UTC | 45m |
| 2026-06-09 | OOOYS | ANR → OXF | Jun 9, 11:25 UTC | Jun 9, 12:30 UTC | 1h 5m |
| 2026-06-08 | OOOYS | HAM → ANR | Jun 8, 14:20 UTC | Jun 8, 15:25 UTC | 1h 5m |
| 2026-06-08 | OOOYS | - | Jun 8, 07:10 UTC | Jun 8, 08:10 UTC | 1h 0m |
| 2026-06-07 | OOOYS | - | Jun 7, 17:40 UTC | Jun 7, 18:35 UTC | 55m |
| 2026-06-07 | OOOYS | - | Jun 7, 16:00 UTC | Jun 7, 17:05 UTC | 1h 5m |
| 2026-06-05 | OOOYS | EMA → CRL | Jun 5, 19:00 UTC | Jun 5, 20:05 UTC | 1h 5m |
| 2026-06-05 | OOOYS | LGG → EMA | Jun 5, 16:25 UTC | Jun 5, 17:35 UTC | 1h 10m |
| 2026-06-03 | OOOYS | - | Jun 3, 16:15 UTC | Jun 3, 17:40 UTC | 1h 25m |
| 2026-06-02 | OOOYS | - | Jun 2, 09:30 UTC | Jun 2, 09:50 UTC | 20m |
| 2026-06-01 | OOOYS | - | Jun 1, 15:00 UTC | Jun 1, 16:35 UTC | 1h 35m |
| 2026-06-01 | OOOYS | - | Jun 1, 08:10 UTC | Jun 1, 10:30 UTC | 2h 20m |
| 2026-06-01 | OOOYS | - | Jun 1, 05:45 UTC | Jun 1, 06:15 UTC | 30m |
| 2026-05-30 | OOOYS | - | May 30, 18:50 UTC | May 30, 20:25 UTC | 1h 35m |
| 2026-05-30 | OOOYS | - | May 30, 09:55 UTC | May 30, 10:15 UTC | 20m |
| 2026-05-30 | OOOYS | - | May 30, 06:45 UTC | May 30, 08:15 UTC | 1h 30m |
| 2026-05-29 | OOOYS | RTM → KJK | May 29, 16:35 UTC | May 29, 17:05 UTC | 30m |
| 2026-05-29 | OOOYS | WAW → RTM | May 29, 13:15 UTC | May 29, 15:25 UTC | 2h 10m |
| 2026-05-28 | OOOYS | RTM → WAW | May 28, 06:10 UTC | May 28, 08:05 UTC | 1h 55m |
| 2026-05-24 | OOOYS | - | May 24, 23:15 UTC | May 24, 23:46 UTC | 31m |
| 2026-05-24 | OOOYS | - | May 24, 20:45 UTC | May 24, 21:30 UTC | 45m |
| 2026-05-24 | OOOYS | - | May 24, 12:35 UTC | May 24, 13:10 UTC | 35m |
| 2026-05-24 | OOOYS | ANR → LTN | May 24, 10:25 UTC | May 24, 11:20 UTC | 55m |
| 2026-05-20 | OOOYS | FRL → ANR | May 20, 07:05 UTC | May 20, 09:05 UTC | 2h 0m |
| 2026-05-18 | OOOYS | ANR → FRL | May 18, 05:10 UTC | May 18, 06:55 UTC | 1h 45m |
| 2026-05-16 | OOOYS | HAM → ANR | May 16, 11:51 UTC | May 16, 12:45 UTC | 55m |
| 2026-05-15 | OOOYS | ANR → HAM | May 15, 11:10 UTC | May 15, 12:10 UTC | 1h 0m |
| 2026-05-13 | OOOYS | - | May 13, 10:05 UTC | May 13, 12:20 UTC | 2h 15m |
| 2026-05-11 | OOOYS | ANR → KRK | May 11, 07:35 UTC | May 11, 09:30 UTC | 1h 55m |
| 2026-05-10 | OOOYS | - | May 10, 13:14 UTC | May 10, 13:25 UTC | 10m |
| 2026-05-10 | OOOYS | - | May 10, 11:00 UTC | May 10, 12:30 UTC | 1h 30m |
| 2026-05-10 | OOOYS | ANR → NCE | May 10, 07:45 UTC | May 10, 09:24 UTC | 1h 40m |
| 2026-05-06 | OOOYS | - | May 6, 11:50 UTC | May 6, 13:50 UTC | 2h 0m |
| 2026-05-06 | OOOYS | - | May 6, 08:10 UTC | May 6, 09:50 UTC | 1h 40m |
| 2026-05-05 | OOOYS | - | May 5, 16:15 UTC | May 5, 17:55 UTC | 1h 40m |
| 2026-05-05 | OOOYS | - | May 5, 05:30 UTC | May 5, 07:25 UTC | 1h 55m |
| 2026-05-01 | OOOYS | BQH → ANR | May 1, 17:50 UTC | May 1, 18:30 UTC | 40m |
| 2026-05-01 | OOOYS | - | May 1, 12:05 UTC | May 1, 12:50 UTC | 45m |
| 2026-04-27 | OOOYS | - | Apr 27, 18:15 UTC | Apr 27, 19:20 UTC | 1h 5m |
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 OO-OYS page for operator, model, and routing details .