sensors Mode-S transponder
7C4A53
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to VH-OYT · AIRBUS A-321neo · operated by JETSTAR AIRWAYS PTY LIMITED
- Hex
- 7C4A53
- Octal
- 37045123
- Decimal
- 8,145,491
- Country
- AU
- Tail
- VH-OYT
- Type
- A21N
- Flights observed
- 238
- Distinct callsigns
- 20
- Country
- AU
- Last broadcast
- 52m ago
Last known position
Country allocation
The ICAO 24-bit address 7C4A53 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 |
|---|---|---|---|
| JST97 | Jetstar Airways | 9 | 2026-05-15 |
| JST972 | - | 8 | 2026-06-25 |
| JST98 | Jetstar Airways | 7 | 2026-05-16 |
| JST975 | - | 7 | 2026-06-26 |
| JST974 | - | 7 | 2026-06-26 |
| JST75 | Jetstar Airways | 7 | 2026-05-17 |
| JST034 | Jetstar Airways | 7 | 2026-05-31 |
| JST971 | - | 6 | 2026-06-26 |
| JST81 | Jetstar Airways | 6 | 2026-05-14 |
| JST80 | Jetstar Airways | 6 | 2026-05-14 |
| JST76 | Jetstar Airways | 6 | 2026-05-17 |
| JST121 | Jetstar Airways | 6 | 2026-05-31 |
| JST043 | - | 6 | 2026-07-12 |
| JST858 | Jetstar Airways | 5 | 2026-05-17 |
| JST857 | Jetstar Airways | 5 | 2026-05-16 |
| JST499 | - | 5 | 2026-07-06 |
| JST498 | - | 5 | 2026-07-05 |
| JST33 | Jetstar Airways | 5 | 2026-05-30 |
| JST110 | - | 5 | 2026-07-01 |
| JST108 | - | 5 | 2026-06-30 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | JST521 | - | Jul 14, 06:15 UTC | Jul 14, 06:45 UTC | 30m |
| 2026-07-14 | JST516 | MEL → SYD | Jul 14, 04:05 UTC | Jul 14, 05:05 UTC | 1h 0m |
| 2026-07-14 | JST793 | MCY → MEL | Jul 14, 00:35 UTC | Jul 14, 02:45 UTC | 2h 10m |
| 2026-07-13 | JST792 | MEL → MCY | Jul 13, 21:40 UTC | Jul 13, 23:35 UTC | 1h 55m |
| 2026-07-13 | JST973 | PER → MEL | Jul 13, 08:01 UTC | Jul 13, 11:10 UTC | 3h 10m |
| 2026-07-13 | JST970 | MEL → PER | Jul 13, 03:05 UTC | Jul 13, 06:55 UTC | 3h 50m |
| 2026-07-12 | JST437 | - | Jul 12, 23:25 UTC | Jul 13, 01:30 UTC | 2h 5m |
| 2026-07-12 | JST432 | - | Jul 12, 20:45 UTC | Jul 12, 22:25 UTC | 1h 40m |
| 2026-07-12 | JST043 | MEL → MEL | Jul 12, 00:30 UTC | Jul 12, 13:05 UTC | 12h 35m |
| 2026-07-11 | JST036 | ADL → MEL | Jul 11, 10:30 UTC | Jul 11, 22:10 UTC | 11h 40m |
| 2026-07-10 | JST039 | SYD → ADL | Jul 10, 20:35 UTC | Jul 11, 08:50 UTC | 12h 15m |
| 2026-07-09 | JST120 | SYD → SYD | Jul 9, 23:25 UTC | Jul 10, 09:35 UTC | 10h 10m |
| 2026-07-09 | JST038 | SYD → SYD | Jul 9, 06:30 UTC | Jul 9, 20:25 UTC | 13h 55m |
| 2026-07-08 | JST112 | SYD → SYD | Jul 8, 11:40 UTC | Jul 9, 01:50 UTC | 14h 10m |
| 2026-07-08 | JST206 | - | Jul 8, 05:45 UTC | Jul 8, 08:55 UTC | 3h 10m |
| 2026-07-08 | JST205 | SYD → AKL | Jul 8, 01:35 UTC | Jul 8, 04:15 UTC | 2h 40m |
| 2026-07-07 | JST038 | ADL → SYD | Jul 7, 11:05 UTC | Jul 7, 22:25 UTC | 11h 20m |
| 2026-07-06 | JST126 | ADL → ADL | Jul 6, 21:10 UTC | Jul 7, 08:55 UTC | 11h 45m |
| 2026-07-06 | JST689 | - | Jul 6, 12:20 UTC | Jul 6, 12:50 UTC | 30m |
| 2026-07-06 | JST688 | - | Jul 6, 05:00 UTC | Jul 6, 05:30 UTC | 30m |
| 2026-07-06 | JST499 | - | Jul 6, 01:40 UTC | Jul 6, 03:45 UTC | 2h 5m |
| 2026-07-05 | JST498 | - | Jul 5, 22:40 UTC | Jul 6, 00:45 UTC | 2h 5m |
| 2026-07-05 | JST128 | - | Jul 5, 20:05 UTC | Jul 5, 20:40 UTC | 35m |
| 2026-07-05 | JST087 | - | Jul 5, 12:30 UTC | Jul 5, 12:40 UTC | 10m |
| 2026-07-05 | JST088 | - | Jul 5, 00:00 UTC | Jul 5, 00:50 UTC | 50m |
| 2026-07-04 | JST089 | - | Jul 4, 09:45 UTC | Jul 4, 21:35 UTC | 11h 50m |
| 2026-07-03 | JST126 | ADL → ADL | Jul 3, 20:55 UTC | Jul 4, 07:55 UTC | 11h 0m |
| 2026-07-03 | JST689 | - | Jul 3, 11:55 UTC | Jul 3, 12:30 UTC | 35m |
| 2026-07-03 | JST688 | - | Jul 3, 04:45 UTC | Jul 3, 05:20 UTC | 35m |
| 2026-07-03 | JST499 | OOL → ADL | Jul 3, 01:15 UTC | Jul 3, 03:50 UTC | 2h 35m |
| 2026-07-02 | JST498 | - | Jul 2, 22:30 UTC | Jul 3, 00:25 UTC | 1h 55m |
| 2026-07-02 | JST127 | ADL → ADL | Jul 2, 10:00 UTC | Jul 2, 21:05 UTC | 11h 5m |
| 2026-07-01 | JST110 | PER → ADL | Jul 1, 23:15 UTC | Jul 2, 08:00 UTC | 8h 45m |
| 2026-07-01 | JST107 | - | Jul 1, 10:05 UTC | Jul 1, 10:40 UTC | 35m |
| 2026-07-01 | JST083 | - | Jul 1, 03:20 UTC | Jul 1, 03:30 UTC | 10m |
| 2026-06-30 | JST108 | - | Jun 30, 13:20 UTC | Jun 30, 13:50 UTC | 30m |
| 2026-06-30 | JST108 | - | Jun 30, 11:15 UTC | Jun 30, 11:50 UTC | 35m |
| 2026-06-30 | JST108 | - | Jun 30, 08:25 UTC | Jun 30, 09:00 UTC | 35m |
| 2026-06-30 | JST111 | PER → ADL | Jun 30, 04:15 UTC | Jun 30, 06:35 UTC | 2h 20m |
| 2026-06-29 | JST106 | PER → DPS | Jun 29, 12:39 UTC | Jun 30, 02:45 UTC | 14h 6m |
| 2026-06-29 | JST043 | MEL → PER | Jun 29, 00:00 UTC | Jun 29, 11:10 UTC | 11h 10m |
| 2026-06-28 | JST033 | MEL → MEL | Jun 28, 06:24 UTC | Jun 28, 18:49 UTC | 12h 25m |
| 2026-06-27 | JST34 | MEL → MEL | Jun 27, 21:25 UTC | Jun 28, 04:35 UTC | 7h 10m |
| 2026-06-27 | JST709 | MEL → MEL | Jun 27, 07:30 UTC | Jun 27, 10:19 UTC | 2h 50m |
| 2026-06-27 | JST451 | - | Jun 27, 04:24 UTC | Jun 27, 06:19 UTC | 1h 55m |
| 2026-06-27 | JST448 | - | Jun 27, 01:44 UTC | Jun 27, 03:30 UTC | 1h 45m |
| 2026-06-26 | JST777 | ADL → MEL | Jun 26, 23:25 UTC | Jun 27, 00:25 UTC | 1h 0m |
| 2026-06-26 | JST776 | MEL → ADL | Jun 26, 21:20 UTC | Jun 26, 22:14 UTC | 55m |
| 2026-06-26 | JST971 | PER → MEL | Jun 26, 16:35 UTC | Jun 26, 19:50 UTC | 3h 15m |
| 2026-06-26 | JST974 | MEL → PER | Jun 26, 08:05 UTC | Jun 26, 11:45 UTC | 3h 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-OYT page for operator, model, and routing details .