sensors Mode-S transponder
7C5D89
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to VH-SRF · EUROCOPTER BK117 C-1/2 · operated by HELISTAR AVIATION PTY LTD
- Hex
- 7C5D89
- Octal
- 37056611
- Decimal
- 8,150,409
- Country
- AU
- Tail
- VH-SRF
- Type
- BK17
- Flights observed
- 29
- Distinct callsigns
- 1
- Country
- AU
- Last broadcast
- 4d ago
Last known position
Country allocation
The ICAO 24-bit address 7C5D89 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| LIFE21 | - | 29 | 2026-05-26 |
Recent flights last 29
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-26 | LIFE21 | - | May 26, 02:10 UTC | May 26, 02:29 UTC | 20m |
| 2026-05-25 | LIFE21 | - | May 25, 23:10 UTC | May 26, 00:39 UTC | 1h 30m |
| 2026-05-25 | LIFE21 | - | May 25, 05:15 UTC | May 25, 06:40 UTC | 1h 25m |
| 2026-05-25 | LIFE21 | - | May 25, 03:35 UTC | May 25, 03:45 UTC | 10m |
| 2026-05-25 | LIFE21 | - | May 25, 01:55 UTC | May 25, 02:50 UTC | 55m |
| 2026-05-23 | LIFE21 | - | May 23, 03:20 UTC | May 23, 04:00 UTC | 40m |
| 2026-05-20 | LIFE21 | - | May 20, 05:45 UTC | May 20, 06:55 UTC | 1h 10m |
| 2026-05-20 | LIFE21 | - | May 20, 04:25 UTC | May 20, 04:45 UTC | 21m |
| 2026-05-19 | LIFE21 | - | May 19, 23:55 UTC | May 20, 02:05 UTC | 2h 10m |
| 2026-05-19 | LIFE21 | - | May 19, 06:40 UTC | May 19, 07:20 UTC | 40m |
| 2026-05-17 | LIFE21 | - | May 17, 23:45 UTC | May 18, 00:05 UTC | 20m |
| 2026-05-17 | LIFE21 | - | May 17, 22:30 UTC | May 17, 22:55 UTC | 25m |
| 2026-05-16 | LIFE21 | - | May 16, 02:55 UTC | May 16, 03:15 UTC | 20m |
| 2026-05-15 | LIFE21 | - | May 15, 23:40 UTC | May 16, 01:20 UTC | 1h 40m |
| 2026-05-10 | LIFE21 | - | May 10, 05:55 UTC | May 10, 06:25 UTC | 30m |
| 2026-05-10 | LIFE21 | - | May 10, 04:00 UTC | May 10, 04:19 UTC | 20m |
| 2026-05-10 | LIFE21 | - | May 10, 03:04 UTC | May 10, 03:14 UTC | 10m |
| 2026-05-09 | LIFE21 | - | May 9, 03:35 UTC | May 9, 03:55 UTC | 20m |
| 2026-05-05 | LIFE21 | - | May 5, 02:55 UTC | May 5, 03:10 UTC | 15m |
| 2026-05-03 | LIFE21 | - | May 3, 05:20 UTC | May 3, 06:00 UTC | 40m |
| 2026-05-01 | LIFE21 | - | May 1, 05:15 UTC | May 1, 05:25 UTC | 10m |
| 2026-04-29 | LIFE21 | - | Apr 29, 01:35 UTC | Apr 29, 01:54 UTC | 20m |
| 2026-04-27 | LIFE21 | - | Apr 27, 01:25 UTC | Apr 27, 02:20 UTC | 55m |
| 2026-04-16 | LIFE21 | - | Apr 16, 05:09 UTC | Apr 16, 05:24 UTC | 15m |
| 2026-04-16 | LIFE21 | - | Apr 16, 04:44 UTC | Apr 16, 04:54 UTC | 10m |
| 2026-04-14 | LIFE21 | - | Apr 14, 06:05 UTC | Apr 14, 06:20 UTC | 15m |
| 2026-04-13 | LIFE21 | - | Apr 13, 05:00 UTC | Apr 13, 05:20 UTC | 20m |
| 2026-04-13 | LIFE21 | - | Apr 13, 03:55 UTC | Apr 13, 04:10 UTC | 15m |
| 2026-04-13 | LIFE21 | - | Apr 13, 03:30 UTC | Apr 13, 04:10 UTC | 40m |
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-SRF page for operator, model, and routing details .