sensors Mode-S transponder
440D5D
ICAO 24-bit transponder address · allocated to Austria
Currently assigned to OE-FRH · CESSNA 525A Citation CJ2
- Hex
- 440D5D
- Octal
- 21006535
- Decimal
- 4,459,869
- Country
- AT
- Tail
- OE-FRH
- Type
- C25A
- Flights observed
- 30
- Distinct callsigns
- 2
- Country
- AT
- Last broadcast
- 11h ago
Last known position
Country allocation
The ICAO 24-bit address 440D5D falls within the block assigned to Austria (AT) by ICAO Annex 10, Volume III. Every aircraft registered in Austria 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 2 distinct
Recent flights last 30
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | MCK305 | - | Jun 2, 15:15 UTC | Jun 2, 16:05 UTC | 50m |
| 2026-06-01 | MCK305 | - | Jun 1, 09:40 UTC | Jun 1, 12:30 UTC | 2h 50m |
| 2026-05-31 | MCK305 | - | May 31, 11:55 UTC | May 31, 13:05 UTC | 1h 10m |
| 2026-05-31 | MCK305 | - | May 31, 09:15 UTC | May 31, 10:20 UTC | 1h 5m |
| 2026-05-30 | MCK305 | - | May 30, 17:35 UTC | May 30, 20:20 UTC | 2h 45m |
| 2026-05-30 | MCK305 | - | May 30, 15:10 UTC | May 30, 16:20 UTC | 1h 10m |
| 2026-05-30 | MCK305 | - | May 30, 10:45 UTC | May 30, 13:05 UTC | 2h 20m |
| 2026-05-29 | MCK305 | RBM → HAM | May 29, 17:15 UTC | May 29, 18:25 UTC | 1h 10m |
| 2026-05-27 | MCK305 | MUC → RBM | May 27, 08:35 UTC | May 27, 09:20 UTC | 45m |
| 2026-05-25 | MCK305 | - | May 25, 10:05 UTC | May 25, 10:45 UTC | 40m |
| 2026-05-25 | MCK305 | - | May 25, 08:15 UTC | May 25, 09:10 UTC | 55m |
| 2026-05-24 | MCK305 | - | May 24, 19:05 UTC | May 24, 20:55 UTC | 1h 50m |
| 2026-05-24 | MCK305 | MUC → BQH | May 24, 16:15 UTC | May 24, 17:50 UTC | 1h 35m |
| 2026-05-22 | MCK305 | - | May 22, 17:05 UTC | May 22, 19:15 UTC | 2h 10m |
| 2026-05-22 | MCK305 | - | May 22, 13:45 UTC | May 22, 15:45 UTC | 2h 0m |
| 2026-05-22 | MCK305 | - | May 22, 10:25 UTC | May 22, 11:40 UTC | 1h 15m |
| 2026-05-21 | MCK305 | - | May 21, 12:35 UTC | May 21, 14:10 UTC | 1h 35m |
| 2026-05-19 | MCK305 | - | May 19, 10:35 UTC | May 19, 12:50 UTC | 2h 15m |
| 2026-05-18 | MCK305 | - | May 18, 09:35 UTC | May 18, 09:55 UTC | 20m |
| 2026-05-17 | MCK305 | - | May 17, 19:35 UTC | May 17, 20:50 UTC | 1h 15m |
| 2026-05-17 | MCK305 | - | May 17, 16:25 UTC | May 17, 17:50 UTC | 1h 25m |
| 2026-05-17 | MCK305 | - | May 17, 13:10 UTC | May 17, 13:35 UTC | 25m |
| 2026-05-16 | MCK305 | - | May 16, 12:05 UTC | May 16, 13:51 UTC | 1h 45m |
| 2026-05-15 | MCK305 | - | May 15, 14:35 UTC | May 15, 16:30 UTC | 1h 54m |
| 2026-05-15 | MCK305 | - | May 15, 10:10 UTC | May 15, 12:30 UTC | 2h 20m |
| 2026-05-15 | MCK305 | - | May 15, 07:55 UTC | May 15, 08:40 UTC | 45m |
| 2026-05-13 | MCK305 | - | May 13, 11:10 UTC | May 13, 11:25 UTC | 15m |
| 2026-04-28 | MCK313 | RBM → RBM | Apr 28, 08:30 UTC | Apr 28, 09:35 UTC | 1h 5m |
| 2026-04-28 | MCK313 | RBM → RBM | Apr 28, 07:45 UTC | Apr 28, 08:10 UTC | 25m |
| 2026-04-18 | MCK313 | - | Apr 18, 10:55 UTC | Apr 18, 11:40 UTC | 45m |
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 OE-FRH page for operator, model, and routing details .