Apparatus

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sensors Mode-S transponder

7C4A51

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-OYR · AIRBUS A-321neo · operated by JETSTAR AIRWAYS PTY LIMITED

Hex
7C4A51
Octal
37045121
Decimal
8,145,489
Country
AU
Tail
VH-OYR
Type
A21N
No current signal · last broadcast 6h ago
Flights observed
243
Distinct callsigns
20
Country
AU
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 7C4A51.

Country allocation

The ICAO 24-bit address 7C4A51 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
JST110 - 11 2026-06-30
JST108 - 10 2026-07-04
JST153 - 7 2026-06-15
JST116 - 7 2026-06-30
JST089 - 7 2026-07-06
JST76 - 6 2026-06-28
JST633 - 6 2026-07-13
JST154 - 6 2026-06-14
JST111 - 6 2026-07-04
JST106 Jetstar Airways 6 2026-07-05
JST057 Jetstar Airways 6 2026-06-09
JST974 - 5 2026-07-09
JST75 - 5 2026-06-28
JST632 - 5 2026-07-12
JST151 Jetstar Airways 5 2026-06-14
JST150 Jetstar Airways 5 2026-06-14
JST107 - 5 2026-07-05
JST083 - 5 2026-07-06
JST858 - 4 2026-06-28
JST857 - 4 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JST689 - Jul 14, 12:30 UTCJul 14, 13:00 UTC30m
2026-07-14 JST688 - Jul 14, 08:10 UTCJul 14, 08:25 UTC15m
2026-07-14 JST688 - Jul 14, 04:50 UTCJul 14, 05:15 UTC25m
2026-07-14 JST499 - Jul 14, 01:20 UTCJul 14, 03:40 UTC2h 20m
2026-07-13 JST498 - Jul 13, 22:25 UTCJul 14, 00:25 UTC2h 0m
2026-07-13 JST049 AVV → ADL Jul 13, 07:50 UTCJul 13, 20:50 UTC13h 0m
2026-07-13 JST633 BNE → AVV Jul 13, 02:05 UTCJul 13, 04:10 UTC2h 5m
2026-07-12 JST632 AVV → BNE Jul 12, 23:05 UTCJul 13, 00:55 UTC1h 50m
2026-07-12 JST049 - Jul 12, 08:25 UTCJul 12, 21:00 UTC12h 35m
2026-07-12 JST633 BNE → AVV Jul 12, 04:20 UTCJul 12, 06:35 UTC2h 15m
2026-07-12 JST558 MEL → BNE Jul 12, 01:05 UTCJul 12, 02:45 UTC1h 40m
2026-07-11 JST703 MEL → MEL Jul 11, 21:05 UTCJul 12, 00:01 UTC2h 55m
2026-07-10 JST121 MEL → MEL Jul 10, 22:15 UTCJul 11, 09:25 UTC11h 10m
2026-07-10 JST449 - Jul 10, 11:25 UTCJul 10, 13:20 UTC1h 55m
2026-07-10 JST446 MEL → OOL Jul 10, 08:50 UTCJul 10, 10:35 UTC1h 45m
2026-07-10 JST521 SYD → MEL Jul 10, 06:45 UTCJul 10, 07:45 UTC1h 0m
2026-07-10 JST516 MEL → SYD Jul 10, 04:15 UTCJul 10, 05:25 UTC1h 10m
2026-07-10 JST793 MCY → MEL Jul 10, 00:25 UTCJul 10, 02:35 UTC2h 10m
2026-07-09 JST792 MEL → MCY Jul 9, 21:15 UTCJul 9, 23:15 UTC2h 0m
2026-07-09 JST971 PER → MEL Jul 9, 16:05 UTCJul 9, 19:10 UTC3h 5m
2026-07-09 JST974 MEL → PER Jul 9, 06:35 UTCJul 9, 10:30 UTC3h 55m
2026-07-09 JST975 PER → MEL Jul 9, 01:50 UTCJul 9, 05:05 UTC3h 15m
2026-07-08 JST972 MEL → PER Jul 8, 20:35 UTCJul 9, 00:15 UTC3h 40m
2026-07-07 JST031 MEL → MEL Jul 7, 20:40 UTCJul 8, 09:10 UTC12h 30m
2026-07-06 JST044 - Jul 6, 23:15 UTCJul 7, 12:05 UTC12h 50m
2026-07-06 JST089 - Jul 6, 20:10 UTCJul 6, 21:05 UTC55m
2026-07-06 JST089 - Jul 6, 11:55 UTCJul 6, 12:05 UTC10m
2026-07-06 JST086 - Jul 6, 09:35 UTCJul 6, 09:45 UTC10m
2026-07-06 JST083 - Jul 6, 03:20 UTCJul 6, 03:30 UTC10m
2026-07-05 JST106 PER → DPS Jul 5, 12:40 UTCJul 5, 13:15 UTC35m
2026-07-05 JST107 - Jul 5, 10:00 UTCJul 5, 10:35 UTC35m
2026-07-05 JST083 - Jul 5, 03:05 UTCJul 5, 03:15 UTC10m
2026-07-04 JST108 - Jul 4, 13:20 UTCJul 4, 13:50 UTC30m
2026-07-04 JST108 ADL → PER Jul 4, 08:30 UTCJul 4, 11:20 UTC2h 50m
2026-07-04 JST111 PER → ADL Jul 4, 04:10 UTCJul 4, 06:45 UTC2h 35m
2026-07-03 JST106 PER → DPS Jul 3, 12:40 UTCJul 4, 02:35 UTC13h 55m
2026-07-03 JST107 - Jul 3, 10:20 UTCJul 3, 11:05 UTC45m
2026-07-03 JST083 - Jul 3, 03:10 UTCJul 3, 03:20 UTC10m
2026-07-02 JST108 - Jul 2, 13:50 UTCJul 2, 14:20 UTC30m
2026-07-02 JST108 - Jul 2, 11:45 UTCJul 2, 12:10 UTC25m
2026-07-02 JST108 - Jul 2, 09:00 UTCJul 2, 09:40 UTC40m
2026-07-02 JST111 PER → ADL Jul 2, 04:20 UTCJul 2, 07:00 UTC2h 40m
2026-07-01 JST106 PER → DPS Jul 1, 12:55 UTCJul 2, 02:45 UTC13h 50m
2026-06-30 JST110 PER → PER Jun 30, 23:15 UTCJul 1, 07:20 UTC8h 5m
2026-06-30 JST116 PER → PER Jun 30, 08:45 UTCJun 30, 18:05 UTC9h 20m
2026-06-29 JST110 PER → PER Jun 29, 23:05 UTCJun 30, 07:15 UTC8h 11m
2026-06-29 JST116 PER → PER Jun 29, 08:54 UTCJun 29, 17:10 UTC8h 15m
2026-06-28 JST110 PER → PER Jun 28, 23:29 UTCJun 29, 07:20 UTC7h 50m
2026-06-28 JST76 - Jun 28, 15:14 UTCJun 28, 21:55 UTC6h 40m
2026-06-28 JST75 PER → BKK Jun 28, 06:59 UTCJun 28, 13:34 UTC6h 35m

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-OYR page for operator, model, and routing details .

Mode-S 7C4A51 frequently asked

What is Mode-S code 7C4A51?
7C4A51 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-OYR.
Where is Mode-S 7C4A51 registered?
Mode-S code 7C4A51 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C4A51 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C4A51, octal 37045121, decimal 8,145,489.
What flights does 7C4A51 operate?
Mode-S 7C4A51 has broadcast 20 distinct callsigns, including JST110, JST108, JST153, JST116, JST089.