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
Transponder active on ground
Flights observed
280
Distinct callsigns
20
Country
AU
Last broadcast
Jul 26, 22:15 UTC

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
JST499 Jetstar Airways 8 2026-07-22
JST498 Jetstar Airways 8 2026-07-21
JST689 - 7 2026-07-18
JST153 - 7 2026-06-15
JST116 - 7 2026-06-30
JST089 - 7 2026-07-06
JST76 - 6 2026-06-28
JST688 - 6 2026-07-18
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JST044 DPS → MEL Jul 26, 22:00 UTCJul 26, 22:15 UTC15m
2026-07-26 JST044 DPS → MEL Jul 26, 00:00 UTCJul 26, 12:40 UTC12h 41m
2026-07-25 JST035 MEL → DPS Jul 25, 07:55 UTCJul 25, 20:25 UTC12h 30m
2026-07-25 JST975 PER → ADL Jul 25, 02:00 UTCJul 25, 05:20 UTC3h 20m
2026-07-24 JST972 MEL → PER Jul 24, 20:30 UTCJul 25, 00:05 UTC3h 35m
2026-07-24 JST973 PER → MEL Jul 24, 10:05 UTCJul 24, 13:35 UTC3h 30m
2026-07-24 JST970 MEL → PER Jul 24, 04:45 UTCJul 24, 08:25 UTC3h 40m
2026-07-23 JST437 OOL → MEL Jul 23, 23:30 UTCJul 24, 01:55 UTC2h 25m
2026-07-23 JST432 MEL → OOL Jul 23, 20:55 UTCJul 23, 22:30 UTC1h 35m
2026-07-23 JST044 DPS → MEL Jul 23, 01:35 UTCJul 23, 14:15 UTC12h 40m
2026-07-22 JST087 SIN → DPS Jul 22, 11:20 UTCJul 22, 22:05 UTC10h 45m
2026-07-22 JST499 OOL → ADL Jul 22, 01:30 UTCJul 22, 03:50 UTC2h 20m
2026-07-21 JST498 ADL → OOL Jul 21, 22:20 UTCJul 22, 00:15 UTC1h 55m
2026-07-21 JST127 ADL → ADL Jul 21, 09:40 UTCJul 21, 20:40 UTC11h 0m
2026-07-20 JST125 ADL → DPS Jul 20, 21:05 UTCJul 21, 07:55 UTC10h 49m
2026-07-20 JST768 SYD → ADL Jul 20, 10:40 UTCJul 20, 12:20 UTC1h 40m
2026-07-20 JST767 ADL → SYD Jul 20, 07:55 UTCJul 20, 09:30 UTC1h 35m
2026-07-20 JST499 OOL → ADL Jul 20, 03:00 UTCJul 20, 03:30 UTC30m
2026-07-20 JST499 OOL → ADL Jul 20, 01:20 UTCJul 20, 02:05 UTC45m
2026-07-19 JST498 ADL → OOL Jul 19, 22:20 UTCJul 20, 00:15 UTC1h 55m
2026-07-19 JST128 - Jul 19, 20:00 UTCJul 19, 20:35 UTC35m
2026-07-19 JST127 - Jul 19, 09:35 UTCJul 19, 10:05 UTC30m
2026-07-19 JST126 - Jul 19, 07:05 UTCJul 19, 07:40 UTC35m
2026-07-18 JST125 - Jul 18, 21:00 UTCJul 18, 21:35 UTC35m
2026-07-18 JST689 - Jul 18, 12:15 UTCJul 18, 12:45 UTC30m
2026-07-18 JST689 - Jul 18, 09:30 UTCJul 18, 09:40 UTC10m
2026-07-18 JST688 - Jul 18, 04:55 UTCJul 18, 05:25 UTC30m
2026-07-18 JST499 OOL → ADL Jul 18, 01:30 UTCJul 18, 03:40 UTC2h 11m
2026-07-17 JST498 ADL → OOL Jul 17, 22:25 UTCJul 18, 00:25 UTC2h 0m
2026-07-17 JST127 ADL → ADL Jul 17, 09:30 UTCJul 17, 20:35 UTC11h 5m
2026-07-16 JST125 ADL → ADL Jul 16, 20:55 UTCJul 17, 07:55 UTC11h 0m
2026-07-16 JST689 - Jul 16, 12:20 UTCJul 16, 12:49 UTC30m
2026-07-16 JST688 - Jul 16, 04:50 UTCJul 16, 05:25 UTC35m
2026-07-16 JST499 - Jul 16, 01:30 UTCJul 16, 03:40 UTC2h 10m
2026-07-15 JST498 ADL → OOL Jul 15, 22:15 UTCJul 16, 00:30 UTC2h 15m
2026-07-15 JST128 ADL → ADL Jul 15, 10:20 UTCJul 15, 20:45 UTC10h 25m
2026-07-14 JST126 ADL → ADL Jul 14, 20:55 UTCJul 15, 08:10 UTC11h 14m
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

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?
Mode-S 7C4A51 is currently broadcasting from the ground.
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, JST499, JST498, JST689.