sensors Mode-S transponder
7CF9FF
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to A54-040 · PILATUS PC-21
- Hex
- 7CF9FF
- Octal
- 37174777
- Decimal
- 8,190,463
- Country
- AU
- Tail
- A54-040
- Type
- PC21
- Flights observed
- 34
- Distinct callsigns
- 20
- Country
- AU
- Last broadcast
- 2d ago
Last known position
Country allocation
The ICAO 24-bit address 7CF9FF 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 |
|---|---|---|---|
| SPIT | - | 3 | 2026-07-06 |
| ALDN78 | - | 3 | 2026-05-15 |
| ROLR35 | - | 2 | 2026-06-24 |
| ROLR22 | - | 2 | 2026-06-29 |
| MUST | - | 2 | 2026-07-14 |
| WASP2 | - | 1 | 2026-04-15 |
| TMPS | - | 1 | 2026-04-27 |
| SPIT2 | - | 1 | 2026-04-22 |
| ROLR5 | - | 1 | 2026-06-26 |
| ROLR44 | - | 1 | 2026-07-09 |
| ROLR40 | - | 1 | 2026-04-29 |
| ROLR39 | - | 1 | 2026-07-16 |
| ROLR31 | - | 1 | 2026-05-14 |
| ROLR26 | - | 1 | 2026-06-22 |
| ROLR23 | - | 1 | 2026-04-20 |
| ROLR20 | - | 1 | 2026-05-11 |
| ROLR2 | - | 1 | 2026-06-30 |
| ROLR06 | - | 1 | 2026-05-04 |
| MERL2 | - | 1 | 2026-04-16 |
| GART | - | 1 | 2026-06-24 |
Recent flights last 34
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-16 | ROLR39 | - | Jul 16, 00:50 UTC | Jul 16, 01:30 UTC | 40m |
| 2026-07-14 | ALDN65 | - | Jul 14, 03:50 UTC | Jul 14, 04:15 UTC | 25m |
| 2026-07-14 | MUST | - | Jul 14, 00:10 UTC | Jul 14, 00:25 UTC | 15m |
| 2026-07-09 | ROLR44 | - | Jul 9, 03:35 UTC | Jul 9, 04:00 UTC | 25m |
| 2026-07-06 | SPIT | - | Jul 6, 03:45 UTC | Jul 6, 04:15 UTC | 30m |
| 2026-06-30 | ROLR2 | - | Jun 30, 23:10 UTC | Jun 30, 23:30 UTC | 20m |
| 2026-06-29 | ROLR22 | - | Jun 29, 02:39 UTC | Jun 29, 02:59 UTC | 20m |
| 2026-06-26 | ROLR5 | - | Jun 26, 02:24 UTC | Jun 26, 02:44 UTC | 20m |
| 2026-06-24 | GART | - | Jun 24, 23:54 UTC | Jun 25, 00:44 UTC | 50m |
| 2026-06-24 | ROLR35 | - | Jun 24, 00:40 UTC | Jun 24, 00:49 UTC | 10m |
| 2026-06-22 | ROLR26 | - | Jun 22, 03:50 UTC | Jun 22, 04:24 UTC | 35m |
| 2026-06-17 | ALDN254 | - | Jun 17, 01:05 UTC | Jun 17, 01:50 UTC | 45m |
| 2026-05-21 | ROLR22 | - | May 21, 01:25 UTC | May 21, 01:55 UTC | 30m |
| 2026-05-20 | BRCT | - | May 20, 00:35 UTC | May 20, 01:10 UTC | 35m |
| 2026-05-18 | SPIT | - | May 18, 00:10 UTC | May 18, 00:55 UTC | 45m |
| 2026-05-15 | ALDN78 | - | May 15, 00:10 UTC | May 15, 00:30 UTC | 20m |
| 2026-05-14 | ROLR31 | - | May 14, 01:40 UTC | May 14, 02:30 UTC | 50m |
| 2026-05-11 | ROLR20 | - | May 11, 01:10 UTC | May 11, 02:00 UTC | 50m |
| 2026-05-07 | ALDN78 | - | May 7, 02:50 UTC | May 7, 03:10 UTC | 20m |
| 2026-05-06 | ALDN78 | - | May 6, 04:55 UTC | May 6, 05:30 UTC | 35m |
| 2026-05-05 | EMBR852 | - | May 5, 05:20 UTC | May 5, 05:50 UTC | 30m |
| 2026-05-04 | ALDN71 | - | May 4, 23:25 UTC | May 5, 00:00 UTC | 35m |
| 2026-05-04 | ROLR06 | - | May 4, 02:19 UTC | May 4, 03:05 UTC | 45m |
| 2026-04-30 | MUST | - | Apr 30, 05:10 UTC | Apr 30, 05:30 UTC | 20m |
| 2026-04-29 | ROLR40 | - | Apr 29, 03:45 UTC | Apr 29, 04:20 UTC | 35m |
| 2026-04-27 | TMPS | - | Apr 27, 06:30 UTC | Apr 27, 06:50 UTC | 20m |
| 2026-04-22 | SPIT2 | - | Apr 22, 05:30 UTC | Apr 22, 05:55 UTC | 25m |
| 2026-04-22 | EMBR858 | - | Apr 22, 02:10 UTC | Apr 22, 02:20 UTC | 10m |
| 2026-04-20 | ROLR23 | - | Apr 20, 01:10 UTC | Apr 20, 01:20 UTC | 10m |
| 2026-04-19 | ALDN52 | - | Apr 19, 22:40 UTC | Apr 19, 23:30 UTC | 50m |
| 2026-04-17 | SPIT | - | Apr 17, 03:20 UTC | Apr 17, 03:45 UTC | 25m |
| 2026-04-16 | MERL2 | - | Apr 16, 01:40 UTC | Apr 16, 01:50 UTC | 10m |
| 2026-04-15 | WASP2 | - | Apr 15, 02:25 UTC | Apr 15, 02:35 UTC | 10m |
| 2026-04-13 | ROLR35 | - | Apr 13, 02:10 UTC | Apr 13, 02:20 UTC | 10m |
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 A54-040 page for operator, model, and routing details .