sensors Mode-S transponder
7CF9F4
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to A54-029 · PILATUS PC-21
- Hex
- 7CF9F4
- Octal
- 37174764
- Decimal
- 8,190,452
- Country
- AU
- Tail
- A54-029
- Type
- PC21
- Flights observed
- 30
- Distinct callsigns
- 20
- Country
- AU
- Last broadcast
- 3d ago
Last known position
Country allocation
The ICAO 24-bit address 7CF9F4 falls within the block assigned to Australia (AU) by ICAO Annex 10, Volume III. Every aircraft registered in Australia 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 |
|---|---|---|---|
| ROLR40 | - | 3 | 2026-06-25 |
| ALDN63 | - | 3 | 2026-05-28 |
| ALDN52 | - | 3 | 2026-07-20 |
| ROLR38 | - | 2 | 2026-07-03 |
| ROLR26 | - | 2 | 2026-07-20 |
| ROLR16 | - | 2 | 2026-05-31 |
| TMPS2 | - | 1 | 2026-05-28 |
| ROLR45 | - | 1 | 2026-06-14 |
| ROLR4 | - | 1 | 2026-05-26 |
| ROLR35 | - | 1 | 2026-06-23 |
| ROLR30 | - | 1 | 2026-05-14 |
| RLTS6 | - | 1 | 2026-06-18 |
| MUST2 | - | 1 | 2026-06-23 |
| MUST | - | 1 | 2026-05-05 |
| EMBR850 | - | 1 | 2026-05-21 |
| CHCK9 | - | 1 | 2026-07-23 |
| CHCK32 | - | 1 | 2026-06-22 |
| ALDN55 | - | 1 | 2026-07-23 |
| ALDN51 | - | 1 | 2026-07-15 |
| ALDN256 | - | 1 | 2026-06-26 |
Recent flights last 30
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-23 | CHCK9 | - | Jul 23, 09:10 UTC | Jul 23, 09:30 UTC | 20m |
| 2026-07-23 | ALDN55 | - | Jul 23, 03:30 UTC | Jul 23, 03:40 UTC | 10m |
| 2026-07-20 | ROLR26 | - | Jul 20, 03:30 UTC | Jul 20, 04:25 UTC | 55m |
| 2026-07-20 | ALDN52 | - | Jul 20, 01:05 UTC | Jul 20, 01:25 UTC | 20m |
| 2026-07-15 | ALDN51 | - | Jul 15, 00:45 UTC | Jul 15, 01:15 UTC | 30m |
| 2026-07-03 | ROLR38 | - | Jul 3, 01:55 UTC | Jul 3, 02:20 UTC | 25m |
| 2026-07-01 | ALDN252 | - | Jul 1, 05:50 UTC | Jul 1, 06:10 UTC | 20m |
| 2026-06-26 | ROLR26 | - | Jun 26, 04:24 UTC | Jun 26, 04:39 UTC | 15m |
| 2026-06-26 | ALDN256 | - | Jun 26, 01:45 UTC | Jun 26, 02:05 UTC | 20m |
| 2026-06-25 | ROLR40 | - | Jun 25, 00:09 UTC | Jun 25, 00:40 UTC | 30m |
| 2026-06-23 | MUST2 | - | Jun 23, 03:54 UTC | Jun 23, 04:14 UTC | 20m |
| 2026-06-23 | ROLR35 | - | Jun 23, 00:30 UTC | Jun 23, 01:04 UTC | 35m |
| 2026-06-22 | CHCK32 | - | Jun 22, 04:49 UTC | Jun 22, 05:20 UTC | 30m |
| 2026-06-18 | RLTS6 | - | Jun 18, 02:40 UTC | Jun 18, 02:45 UTC | 5m |
| 2026-06-14 | ROLR45 | - | Jun 14, 22:25 UTC | Jun 14, 22:50 UTC | 25m |
| 2026-05-31 | ROLR16 | - | May 31, 23:00 UTC | May 31, 23:35 UTC | 35m |
| 2026-05-28 | TMPS2 | - | May 28, 05:00 UTC | May 28, 05:25 UTC | 25m |
| 2026-05-28 | ALDN63 | - | May 28, 02:15 UTC | May 28, 02:45 UTC | 30m |
| 2026-05-26 | ROLR4 | - | May 26, 04:10 UTC | May 26, 04:20 UTC | 10m |
| 2026-05-21 | EMBR850 | - | May 21, 02:10 UTC | May 21, 02:40 UTC | 30m |
| 2026-05-14 | ROLR38 | - | May 14, 23:25 UTC | May 14, 23:40 UTC | 15m |
| 2026-05-14 | ROLR30 | - | May 14, 01:45 UTC | May 14, 02:40 UTC | 55m |
| 2026-05-07 | ALDN52 | - | May 7, 23:59 UTC | May 8, 00:25 UTC | 25m |
| 2026-05-07 | ALDN52 | - | May 7, 05:00 UTC | May 7, 05:30 UTC | 30m |
| 2026-05-07 | ALDN63 | - | May 7, 02:35 UTC | May 7, 02:55 UTC | 20m |
| 2026-05-06 | ALDN63 | - | May 6, 04:40 UTC | May 6, 05:15 UTC | 35m |
| 2026-05-05 | MUST | - | May 5, 00:15 UTC | May 5, 00:25 UTC | 10m |
| 2026-05-04 | ROLR16 | - | May 4, 03:24 UTC | May 4, 03:54 UTC | 30m |
| 2026-04-24 | ROLR40 | - | Apr 24, 05:25 UTC | Apr 24, 06:20 UTC | 55m |
| 2026-04-24 | ROLR40 | - | Apr 24, 04:20 UTC | Apr 24, 04:40 UTC | 20m |
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 A54-029 page for operator, model, and routing details .