sensors Mode-S transponder
7C1BDD
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to VH-FSF · CIRRUS SR-22 · operated by ROYAL FLYING DOCTOR SERVICE OF AUSTRALIA CENTRAL OPERATIONS
- Hex
- 7C1BDD
- Octal
- 37015735
- Decimal
- 8,133,597
- Country
- AU
- Tail
- VH-FSF
- Type
- SR22
- Flights observed
- 113
- Distinct callsigns
- 20
- Country
- AU
- Last broadcast
- 3d ago
Last known position
Country allocation
The ICAO 24-bit address 7C1BDD 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 |
|---|---|---|---|
| FD583 | Thai AirAsia | 13 | 2026-06-10 |
| FD532 | Thai AirAsia | 9 | 2026-06-16 |
| FD516 | - | 7 | 2026-07-11 |
| FD536 | - | 6 | 2026-05-26 |
| FD533 | - | 6 | 2026-06-29 |
| FD514 | - | 6 | 2026-05-21 |
| FD580 | - | 5 | 2026-06-15 |
| FD546 | - | 5 | 2026-04-24 |
| FD544 | - | 4 | 2026-06-29 |
| FD539 | - | 4 | 2026-05-26 |
| FD531 | - | 4 | 2026-06-24 |
| FD528 | - | 4 | 2026-06-27 |
| FD526 | - | 4 | 2026-06-02 |
| FD525 | - | 4 | 2026-07-08 |
| FD524 | - | 4 | 2026-05-14 |
| FD517 | - | 4 | 2026-04-18 |
| FD593 | - | 2 | 2026-06-26 |
| FD591 | - | 2 | 2026-04-30 |
| FD573 | - | 2 | 2026-06-12 |
| FD567 | Thai AirAsia | 2 | 2026-05-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-11 | FD516 | - | Jul 11, 06:25 UTC | Jul 11, 06:55 UTC | 30m |
| 2026-07-10 | FD538 | ADL → ADL | Jul 10, 07:30 UTC | Jul 10, 08:55 UTC | 1h 25m |
| 2026-07-10 | FD545 | ADL → ADL | Jul 10, 04:10 UTC | Jul 10, 05:15 UTC | 1h 5m |
| 2026-07-08 | FD525 | - | Jul 8, 06:55 UTC | Jul 8, 07:30 UTC | 35m |
| 2026-07-07 | FD525 | - | Jul 7, 23:40 UTC | Jul 8, 00:30 UTC | 50m |
| 2026-06-29 | FD544 | - | Jun 29, 09:54 UTC | Jun 29, 10:29 UTC | 35m |
| 2026-06-29 | FD544 | - | Jun 29, 05:50 UTC | Jun 29, 06:19 UTC | 30m |
| 2026-06-29 | FD533 | - | Jun 29, 03:25 UTC | Jun 29, 04:00 UTC | 35m |
| 2026-06-29 | FD533 | - | Jun 29, 00:29 UTC | Jun 29, 01:10 UTC | 40m |
| 2026-06-27 | FD528 | - | Jun 27, 06:35 UTC | Jun 27, 07:15 UTC | 40m |
| 2026-06-26 | FD528 | - | Jun 26, 23:00 UTC | Jun 26, 23:44 UTC | 45m |
| 2026-06-26 | FD545 | ADL → ADL | Jun 26, 07:35 UTC | Jun 26, 09:39 UTC | 2h 5m |
| 2026-06-26 | FD593 | ADL → ADL | Jun 26, 04:59 UTC | Jun 26, 06:09 UTC | 1h 10m |
| 2026-06-25 | FD544 | KGC → ADL | Jun 25, 02:19 UTC | Jun 25, 03:10 UTC | 50m |
| 2026-06-25 | FD544 | - | Jun 25, 00:24 UTC | Jun 25, 00:55 UTC | 30m |
| 2026-06-24 | FD531 | - | Jun 24, 06:10 UTC | Jun 24, 06:45 UTC | 35m |
| 2026-06-23 | FD531 | - | Jun 23, 23:39 UTC | Jun 24, 00:15 UTC | 35m |
| 2026-06-23 | FD518 | DMK → HKG | Jun 23, 08:54 UTC | Jun 23, 09:34 UTC | 40m |
| 2026-06-16 | FD532 | DMK → CAN | Jun 16, 21:45 UTC | Jun 16, 22:20 UTC | 35m |
| 2026-06-15 | FSF | - | Jun 15, 05:10 UTC | Jun 15, 06:04 UTC | 55m |
| 2026-06-15 | FD580 | - | Jun 15, 01:25 UTC | Jun 15, 02:04 UTC | 40m |
| 2026-06-14 | FD580 | - | Jun 14, 07:15 UTC | Jun 14, 07:55 UTC | 40m |
| 2026-06-13 | FD580 | ADL → PLO | Jun 13, 23:20 UTC | Jun 14, 00:00 UTC | 40m |
| 2026-06-12 | FD573 | ADL → ADL | Jun 12, 07:50 UTC | Jun 12, 09:05 UTC | 1h 15m |
| 2026-06-11 | FD518 | DMK → HKG | Jun 11, 07:20 UTC | Jun 11, 09:15 UTC | 1h 55m |
| 2026-06-10 | FD583 | KMG → DMK | Jun 10, 07:40 UTC | Jun 10, 08:10 UTC | 30m |
| 2026-06-09 | FD583 | KMG → DMK | Jun 9, 23:55 UTC | Jun 10, 00:45 UTC | 50m |
| 2026-06-09 | FD573 | WUH → DMK | Jun 9, 07:20 UTC | Jun 9, 08:50 UTC | 1h 30m |
| 2026-06-05 | FD583 | KMG → DMK | Jun 5, 02:30 UTC | Jun 5, 03:15 UTC | 45m |
| 2026-06-04 | FD583 | KMG → DMK | Jun 4, 23:45 UTC | Jun 5, 00:20 UTC | 35m |
| 2026-06-04 | FD578 | ADL → ADL | Jun 4, 07:50 UTC | Jun 4, 08:55 UTC | 1h 5m |
| 2026-06-03 | FD583 | KMG → DMK | Jun 3, 04:10 UTC | Jun 3, 04:50 UTC | 40m |
| 2026-06-02 | FD583 | KMG → DMK | Jun 2, 23:50 UTC | Jun 3, 00:35 UTC | 45m |
| 2026-06-02 | FD526 | - | Jun 2, 09:20 UTC | Jun 2, 09:55 UTC | 35m |
| 2026-06-02 | FD526 | - | Jun 2, 06:45 UTC | Jun 2, 07:05 UTC | 20m |
| 2026-06-01 | FD583 | KMG → DMK | Jun 1, 03:10 UTC | Jun 1, 03:40 UTC | 30m |
| 2026-05-31 | FD583 | KMG → DMK | May 31, 23:50 UTC | Jun 1, 00:30 UTC | 40m |
| 2026-05-28 | FD532 | DMK → CAN | May 28, 10:30 UTC | May 28, 11:00 UTC | 30m |
| 2026-05-28 | FD532 | DMK → CAN | May 28, 04:30 UTC | May 28, 04:55 UTC | 25m |
| 2026-05-27 | FD529 | ADL → ADL | May 27, 10:15 UTC | May 27, 11:05 UTC | 50m |
| 2026-05-27 | FD583 | KMG → DMK | May 27, 08:55 UTC | May 27, 09:40 UTC | 45m |
| 2026-05-26 | FD583 | KMG → DMK | May 26, 23:54 UTC | May 27, 00:30 UTC | 35m |
| 2026-05-26 | FD536 | - | May 26, 09:25 UTC | May 26, 09:49 UTC | 25m |
| 2026-05-26 | FD536 | - | May 26, 06:14 UTC | May 26, 06:44 UTC | 30m |
| 2026-05-26 | FD539 | - | May 26, 02:49 UTC | May 26, 03:15 UTC | 25m |
| 2026-05-26 | FD539 | - | May 26, 00:54 UTC | May 26, 01:20 UTC | 25m |
| 2026-05-25 | FD536 | - | May 25, 06:10 UTC | May 25, 06:40 UTC | 30m |
| 2026-05-25 | FD536 | - | May 25, 03:35 UTC | May 25, 04:05 UTC | 30m |
| 2026-05-22 | FD580 | - | May 22, 08:45 UTC | May 22, 09:25 UTC | 40m |
| 2026-05-22 | FD580 | - | May 22, 06:55 UTC | May 22, 07:15 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 VH-FSF page for operator, model, and routing details .