sensors Mode-S transponder
7C4A4A
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to VH-OYK · AIRBUS A-321neo · operated by JETSTAR AIRWAYS PTY LIMITED
- Hex
- 7C4A4A
- Octal
- 37045112
- Decimal
- 8,145,482
- Country
- AU
- Tail
- VH-OYK
- Type
- A21N
- Flights observed
- 128
- Distinct callsigns
- 20
- Country
- AU
- Last broadcast
- 5h ago
Last known position
Country allocation
The ICAO 24-bit address 7C4A4A 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 |
|---|---|---|---|
| JST499 | Jetstar Airways | 10 | 2026-05-30 |
| JST498 | Jetstar Airways | 10 | 2026-05-29 |
| JST089 | Jetstar Airways | 8 | 2026-05-14 |
| JST044 | Jetstar Airways | 6 | 2026-05-12 |
| JST688 | Jetstar Airways | 5 | 2026-05-29 |
| JST128 | Jetstar Airways | 4 | 2026-05-20 |
| JST126 | Jetstar Airways | 4 | 2026-05-19 |
| JST125 | Jetstar Airways | 4 | 2026-05-24 |
| JST111 | Jetstar Airways | 4 | 2026-05-28 |
| JST108 | Jetstar Airways | 4 | 2026-05-07 |
| JST106 | Jetstar Airways | 4 | 2026-05-27 |
| JST974 | Jetstar Airways | 3 | 2026-05-27 |
| JST689 | Jetstar Airways | 3 | 2026-05-29 |
| JST088 | Jetstar Airways | 3 | 2026-04-22 |
| JST973 | Jetstar Airways | 2 | 2026-05-26 |
| JST970 | Jetstar Airways | 2 | 2026-05-26 |
| JST633 | Jetstar Airways | 2 | 2026-04-30 |
| JST34 | Jetstar Airways | 2 | 2026-05-01 |
| JST33 | Jetstar Airways | 2 | 2026-04-25 |
| JST127 | Jetstar Airways | 2 | 2026-05-22 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | JST499 | OOL → ADL | May 30, 01:20 UTC | May 30, 03:40 UTC | 2h 20m |
| 2026-05-29 | JST498 | ADL → OOL | May 29, 22:10 UTC | May 30, 00:10 UTC | 2h 0m |
| 2026-05-29 | JST689 | DRW → ADL | May 29, 12:15 UTC | May 29, 12:50 UTC | 35m |
| 2026-05-29 | JST688 | ADL → DRW | May 29, 05:00 UTC | May 29, 05:30 UTC | 30m |
| 2026-05-29 | JST499 | OOL → ADL | May 29, 01:25 UTC | May 29, 03:50 UTC | 2h 25m |
| 2026-05-28 | JST498 | ADL → OOL | May 28, 22:15 UTC | May 29, 00:10 UTC | 1h 55m |
| 2026-05-28 | JST111 | DPS → PER | May 28, 09:40 UTC | May 28, 12:10 UTC | 2h 30m |
| 2026-05-27 | JST106 | PER → DPS | May 27, 14:15 UTC | May 28, 08:00 UTC | 17h 45m |
| 2026-05-27 | JST974 | ADL → PER | May 27, 11:10 UTC | May 27, 11:45 UTC | 35m |
| 2026-05-27 | JST974 | ADL → PER | May 27, 10:25 UTC | May 27, 10:40 UTC | 15m |
| 2026-05-27 | JST974 | ADL → PER | May 27, 07:20 UTC | May 27, 08:35 UTC | 1h 15m |
| 2026-05-27 | JST975 | PER → ADL | May 27, 01:54 UTC | May 27, 05:40 UTC | 3h 45m |
| 2026-05-26 | JST972 | MEL → PER | May 26, 20:40 UTC | May 27, 00:44 UTC | 4h 5m |
| 2026-05-26 | JST973 | PER → MEL | May 26, 09:40 UTC | May 26, 13:10 UTC | 3h 30m |
| 2026-05-26 | JST970 | MEL → PER | May 26, 03:45 UTC | May 26, 08:15 UTC | 4h 30m |
| 2026-05-26 | JST509 | SYD → MEL | May 26, 01:00 UTC | May 26, 02:15 UTC | 1h 15m |
| 2026-05-25 | JST502 | MEL → SYD | May 25, 22:05 UTC | May 25, 23:30 UTC | 1h 25m |
| 2026-05-24 | JST125 | ADL → DPS | May 24, 21:15 UTC | May 25, 09:35 UTC | 12h 20m |
| 2026-05-24 | JST688 | ADL → DRW | May 24, 04:55 UTC | May 24, 12:40 UTC | 7h 45m |
| 2026-05-24 | JST499 | OOL → ADL | May 24, 01:25 UTC | May 24, 03:35 UTC | 2h 10m |
| 2026-05-23 | JST498 | ADL → OOL | May 23, 22:20 UTC | May 24, 00:25 UTC | 2h 5m |
| 2026-05-23 | JST499 | OOL → ADL | May 23, 02:00 UTC | May 23, 04:20 UTC | 2h 20m |
| 2026-05-22 | JST498 | ADL → OOL | May 22, 22:55 UTC | May 23, 00:55 UTC | 2h 0m |
| 2026-05-22 | JST127 | ADL → DPS | May 22, 10:05 UTC | May 22, 21:25 UTC | 11h 20m |
| 2026-05-21 | JST125 | ADL → DPS | May 21, 21:30 UTC | May 22, 08:30 UTC | 11h 0m |
| 2026-05-21 | JST499 | OOL → ADL | May 21, 06:25 UTC | May 21, 08:35 UTC | 2h 10m |
| 2026-05-20 | JST498 | ADL → OOL | May 20, 22:20 UTC | May 21, 00:25 UTC | 2h 5m |
| 2026-05-20 | JST128 | DPS → ADL | May 20, 09:30 UTC | May 20, 20:35 UTC | 11h 5m |
| 2026-05-19 | JST126 | DPS → ADL | May 19, 20:55 UTC | May 20, 07:55 UTC | 11h 1m |
| 2026-05-19 | JST768 | SYD → ADL | May 19, 10:35 UTC | May 19, 12:20 UTC | 1h 45m |
| 2026-05-19 | JST767 | ADL → SYD | May 19, 07:55 UTC | May 19, 09:30 UTC | 1h 35m |
| 2026-05-19 | JST499 | OOL → ADL | May 19, 01:35 UTC | May 19, 04:00 UTC | 2h 25m |
| 2026-05-18 | JST498 | ADL → OOL | May 18, 22:35 UTC | May 19, 00:40 UTC | 2h 5m |
| 2026-05-18 | JST128 | DPS → ADL | May 18, 09:35 UTC | May 18, 21:05 UTC | 11h 29m |
| 2026-05-17 | JST126 | DPS → ADL | May 17, 12:35 UTC | May 18, 08:01 UTC | 19h 25m |
| 2026-05-16 | JST031 | MEL → DPS | May 16, 20:45 UTC | May 17, 08:35 UTC | 11h 50m |
| 2026-05-15 | JST121 | MEL → SYD | May 15, 22:00 UTC | May 16, 09:01 UTC | 11h 1m |
| 2026-05-15 | JST034 | DPS → MEL | May 15, 02:50 UTC | May 15, 19:00 UTC | 16h 10m |
| 2026-05-14 | JST89 | DPS → NTL | May 14, 23:50 UTC | May 15, 00:50 UTC | 1h 0m |
| 2026-05-14 | JST089 | DPS → NTL | May 14, 20:45 UTC | May 14, 22:35 UTC | 1h 50m |
| 2026-05-14 | JST089 | DPS → NTL | May 14, 11:40 UTC | May 14, 11:55 UTC | 15m |
| 2026-05-13 | JST043 | MEL → DPS | May 13, 23:50 UTC | May 14, 00:55 UTC | 1h 5m |
| 2026-05-12 | JST044 | DPS → MEL | May 12, 23:40 UTC | May 13, 12:40 UTC | 13h 0m |
| 2026-05-12 | JST089 | DPS → NTL | May 12, 20:25 UTC | May 12, 21:20 UTC | 55m |
| 2026-05-11 | JST089 | DPS → NTL | May 11, 21:30 UTC | May 12, 20:30 UTC | 23h 0m |
| 2026-05-10 | JST121 | MEL → SYD | May 10, 21:49 UTC | May 11, 11:05 UTC | 13h 15m |
| 2026-05-10 | JST449 | OOL → MEL | May 10, 11:15 UTC | May 10, 13:05 UTC | 1h 50m |
| 2026-05-10 | JST446 | MEL → OOL | May 10, 08:30 UTC | May 10, 10:19 UTC | 1h 50m |
| 2026-05-10 | JST521 | SYD → MEL | May 10, 06:10 UTC | May 10, 07:10 UTC | 1h 0m |
| 2026-05-10 | JST516 | MEL → SYD | May 10, 04:09 UTC | May 10, 05:14 UTC | 1h 5m |
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-OYK page for operator, model, and routing details .