sensors Mode-S transponder
7C4A57
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to VH-OYX · AIRBUS A-321neo · operated by JETSTAR AIRWAYS PTY LIMITED
- Hex
- 7C4A57
- Octal
- 37045127
- Decimal
- 8,145,495
- Country
- AU
- Tail
- VH-OYX
- Type
- A21N
- Flights observed
- 266
- Distinct callsigns
- 20
- Country
- AU
- Last broadcast
- 55m ago
Last known position
Country allocation
The ICAO 24-bit address 7C4A57 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 |
|---|---|---|---|
| JST986 | - | 12 | 2026-07-06 |
| JST499 | - | 11 | 2026-07-11 |
| JST987 | - | 9 | 2026-07-06 |
| JST505 | - | 9 | 2026-07-05 |
| JST498 | - | 9 | 2026-07-10 |
| JST508 | - | 8 | 2026-07-05 |
| JST037 | - | 8 | 2026-07-07 |
| JST689 | - | 7 | 2026-07-11 |
| JST688 | - | 7 | 2026-07-11 |
| JST089 | Jetstar Airways | 7 | 2026-05-21 |
| JST088 | Jetstar Airways | 7 | 2026-05-19 |
| JST087 | Jetstar Airways | 6 | 2026-05-20 |
| JST204 | - | 5 | 2026-07-07 |
| JST203 | - | 5 | 2026-07-06 |
| JST111 | Jetstar Airways | 5 | 2026-05-16 |
| JST043 | Jetstar Airways | 5 | 2026-05-18 |
| JST633 | Jetstar Airways | 4 | 2026-05-22 |
| JST632 | Jetstar Airways | 4 | 2026-05-22 |
| JST125 | - | 4 | 2026-07-08 |
| JST106 | Jetstar Airways | 4 | 2026-05-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | JST34 | - | Jul 14, 20:45 UTC | Jul 14, 21:10 UTC | 25m |
| 2026-07-14 | JST948 | MEL → MEL | Jul 14, 08:05 UTC | Jul 14, 15:05 UTC | 7h 0m |
| 2026-07-14 | JST451 | - | Jul 14, 04:40 UTC | Jul 14, 06:50 UTC | 2h 10m |
| 2026-07-14 | JST448 | - | Jul 14, 02:00 UTC | Jul 14, 03:40 UTC | 1h 40m |
| 2026-07-13 | JST777 | ADL → MEL | Jul 13, 23:40 UTC | Jul 14, 00:40 UTC | 1h 0m |
| 2026-07-13 | JST776 | MEL → ADL | Jul 13, 21:40 UTC | Jul 13, 22:45 UTC | 1h 5m |
| 2026-07-13 | JST449 | - | Jul 13, 11:20 UTC | Jul 13, 13:10 UTC | 1h 50m |
| 2026-07-13 | JST446 | - | Jul 13, 08:40 UTC | Jul 13, 10:20 UTC | 1h 40m |
| 2026-07-13 | JST521 | - | Jul 13, 06:25 UTC | Jul 13, 07:40 UTC | 1h 15m |
| 2026-07-13 | JST516 | MEL → SYD | Jul 13, 04:10 UTC | Jul 13, 05:10 UTC | 1h 0m |
| 2026-07-13 | JST793 | MCY → MEL | Jul 13, 00:25 UTC | Jul 13, 02:40 UTC | 2h 15m |
| 2026-07-12 | JST792 | MEL → MCY | Jul 12, 21:15 UTC | Jul 12, 23:10 UTC | 1h 55m |
| 2026-07-11 | JST032 | ADL → MEL | Jul 11, 21:35 UTC | Jul 12, 09:20 UTC | 11h 45m |
| 2026-07-11 | JST689 | - | Jul 11, 12:10 UTC | Jul 11, 12:45 UTC | 35m |
| 2026-07-11 | JST688 | - | Jul 11, 04:55 UTC | Jul 11, 05:25 UTC | 30m |
| 2026-07-11 | JST499 | - | Jul 11, 01:30 UTC | Jul 11, 03:50 UTC | 2h 20m |
| 2026-07-10 | JST498 | - | Jul 10, 22:40 UTC | Jul 11, 00:35 UTC | 1h 55m |
| 2026-07-10 | JST689 | - | Jul 10, 12:10 UTC | Jul 10, 12:40 UTC | 30m |
| 2026-07-10 | JST688 | - | Jul 10, 05:00 UTC | Jul 10, 05:30 UTC | 30m |
| 2026-07-10 | JST499 | - | Jul 10, 01:35 UTC | Jul 10, 03:50 UTC | 2h 15m |
| 2026-07-09 | JST498 | - | Jul 9, 22:30 UTC | Jul 10, 00:35 UTC | 2h 5m |
| 2026-07-09 | JST127 | ADL → ADL | Jul 9, 09:55 UTC | Jul 9, 20:45 UTC | 10h 50m |
| 2026-07-08 | JST125 | ADL → ADL | Jul 8, 20:55 UTC | Jul 9, 08:15 UTC | 11h 20m |
| 2026-07-08 | JST689 | - | Jul 8, 12:55 UTC | Jul 8, 13:25 UTC | 30m |
| 2026-07-08 | JST688 | - | Jul 8, 09:20 UTC | Jul 8, 09:30 UTC | 10m |
| 2026-07-08 | JST688 | - | Jul 8, 05:25 UTC | Jul 8, 05:50 UTC | 25m |
| 2026-07-08 | JST499 | - | Jul 8, 03:35 UTC | Jul 8, 04:10 UTC | 35m |
| 2026-07-08 | JST499 | - | Jul 8, 01:50 UTC | Jul 8, 02:40 UTC | 50m |
| 2026-07-07 | JST498 | - | Jul 7, 22:30 UTC | Jul 8, 00:25 UTC | 1h 55m |
| 2026-07-07 | JST037 | SYD → ADL | Jul 7, 06:30 UTC | Jul 7, 20:35 UTC | 14h 5m |
| 2026-07-07 | JST204 | - | Jul 7, 00:45 UTC | Jul 7, 03:40 UTC | 2h 55m |
| 2026-07-06 | JST203 | SYD → AKL | Jul 6, 20:35 UTC | Jul 6, 23:20 UTC | 2h 45m |
| 2026-07-06 | JST987 | PER → SYD | Jul 6, 08:15 UTC | Jul 6, 12:15 UTC | 4h 0m |
| 2026-07-06 | JST986 | SYD → PER | Jul 6, 02:10 UTC | Jul 6, 06:25 UTC | 4h 15m |
| 2026-07-05 | JST508 | MEL → SYD | Jul 5, 23:30 UTC | Jul 6, 00:45 UTC | 1h 15m |
| 2026-07-05 | JST505 | SYD → MEL | Jul 5, 21:05 UTC | Jul 5, 22:20 UTC | 1h 15m |
| 2026-07-05 | JST987 | PER → SYD | Jul 5, 08:10 UTC | Jul 5, 12:05 UTC | 3h 55m |
| 2026-07-05 | JST986 | SYD → PER | Jul 5, 02:10 UTC | Jul 5, 06:30 UTC | 4h 20m |
| 2026-07-04 | JST813 | BNE → SYD | Jul 4, 22:20 UTC | Jul 4, 23:40 UTC | 1h 20m |
| 2026-07-04 | JST810 | SYD → BNE | Jul 4, 20:10 UTC | Jul 4, 21:20 UTC | 1h 10m |
| 2026-07-04 | JST987 | PER → SYD | Jul 4, 08:10 UTC | Jul 4, 12:15 UTC | 4h 5m |
| 2026-07-04 | JST986 | SYD → PER | Jul 4, 02:25 UTC | Jul 4, 06:50 UTC | 4h 25m |
| 2026-07-04 | JST508 | MEL → SYD | Jul 4, 00:05 UTC | Jul 4, 01:05 UTC | 1h 0m |
| 2026-07-03 | JST505 | SYD → MEL | Jul 3, 21:35 UTC | Jul 3, 22:50 UTC | 1h 15m |
| 2026-07-03 | JST987 | PER → SYD | Jul 3, 08:10 UTC | Jul 3, 12:05 UTC | 3h 55m |
| 2026-07-03 | JST986 | SYD → PER | Jul 3, 02:10 UTC | Jul 3, 06:45 UTC | 4h 35m |
| 2026-07-02 | JST508 | MEL → SYD | Jul 2, 23:45 UTC | Jul 3, 00:40 UTC | 55m |
| 2026-07-02 | JST505 | SYD → MEL | Jul 2, 21:25 UTC | Jul 2, 22:40 UTC | 1h 15m |
| 2026-07-02 | JST124 | SYD → SYD | Jul 2, 01:50 UTC | Jul 2, 10:50 UTC | 9h 0m |
| 2026-07-01 | JST037 | SYD → SYD | Jul 1, 06:30 UTC | Jul 1, 20:20 UTC | 13h 50m |
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-OYX page for operator, model, and routing details .