Apparatus

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sensors Mode-S transponder

7C4A42

ICAO 24-bit transponder address · allocated to Australia

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

Hex
7C4A42
Octal
37045102
Decimal
8,145,474
Country
AU
Tail
VH-OYC
Type
A21N
Broadcasting now · callsign JST037 · 29,950 ft
Flights observed
208
Distinct callsigns
20
Country
AU
Last broadcast
Jul 26, 13:10 UTC

Current position

7C4A42 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 7C4A42 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
JST111 Jetstar Airways 9 2026-07-25
JST108 Jetstar Airways 9 2026-07-25
JST043 Jetstar Airways 9 2026-07-24
JST116 Jetstar Airways 8 2026-07-19
JST974 - 7 2026-06-28
JST858 Jetstar Airways 6 2026-07-20
JST75 Jetstar Airways 6 2026-07-20
JST71 - 6 2026-07-11
JST971 - 5 2026-07-21
JST81 - 5 2026-07-09
JST80 - 5 2026-07-10
JST76 Jetstar Airways 5 2026-07-20
JST632 Jetstar Airways 5 2026-05-29
JST110 Jetstar Airways 5 2026-07-18
JST039 Jetstar Airways 5 2026-07-22
JST035 Jetstar Airways 5 2026-06-13
JST975 - 4 2026-06-28
JST34 Jetstar Airways 4 2026-06-12
JST109 Jetstar Airways 4 2026-05-26
JST106 Jetstar Airways 4 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JST106 PER → DPS Jul 26, 12:40 UTCJul 26, 13:10 UTC30m
2026-07-26 JST107 DPS → PER Jul 26, 10:05 UTCJul 26, 10:40 UTC35m
2026-07-26 JST083 DRW → DPS Jul 26, 03:10 UTCJul 26, 03:20 UTC10m
2026-07-25 JST108 ADL → PER Jul 25, 13:10 UTCJul 25, 13:40 UTC30m
2026-07-25 JST108 ADL → PER Jul 25, 08:25 UTCJul 25, 11:25 UTC3h 0m
2026-07-25 JST111 DPS → PER Jul 25, 04:15 UTCJul 25, 06:55 UTC2h 40m
2026-07-24 JST106 PER → DPS Jul 24, 13:40 UTCJul 25, 02:35 UTC12h 55m
2026-07-24 JST043 MEL → DPS Jul 24, 00:30 UTCJul 24, 12:00 UTC11h 30m
2026-07-22 JST039 SYD → DPS Jul 22, 20:40 UTCJul 23, 09:35 UTC12h 55m
2026-07-22 JST724 HBA → SYD Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-22 JST514 MEL → SYD Jul 22, 03:35 UTCJul 22, 04:40 UTC1h 5m
2026-07-22 JST509 SYD → MEL Jul 22, 00:00 UTCJul 22, 01:20 UTC1h 20m
2026-07-21 JST502 MEL → SYD Jul 21, 21:55 UTCJul 21, 22:55 UTC1h 0m
2026-07-21 JST971 PER → MEL Jul 21, 15:55 UTCJul 21, 19:00 UTC3h 5m
2026-07-21 JST98 - Jul 21, 07:25 UTCJul 21, 12:05 UTC4h 40m
2026-07-21 JST97 PER → SIN Jul 21, 00:05 UTCJul 21, 04:00 UTC3h 55m
2026-07-20 JST76 BKK → PER Jul 20, 16:00 UTCJul 20, 22:15 UTC6h 15m
2026-07-20 JST75 PER → BKK Jul 20, 07:15 UTCJul 20, 14:15 UTC7h 0m
2026-07-20 JST858 ADL → PER Jul 20, 01:40 UTCJul 20, 04:55 UTC3h 15m
2026-07-19 JST857 PER → ADL Jul 19, 22:20 UTCJul 20, 00:40 UTC2h 20m
2026-07-19 JST116 PER → DPS Jul 19, 09:10 UTCJul 19, 17:20 UTC8h 10m
2026-07-18 JST110 PER → DPS Jul 18, 22:55 UTCJul 19, 06:50 UTC7h 55m
2026-07-18 JST108 ADL → PER Jul 18, 08:40 UTCJul 18, 11:45 UTC3h 5m
2026-07-18 JST111 DPS → PER Jul 18, 04:25 UTCJul 18, 06:45 UTC2h 20m
2026-07-17 JST106 PER → DPS Jul 17, 13:00 UTCJul 18, 02:29 UTC13h 30m
2026-07-17 JST088 - Jul 17, 00:04 UTCJul 17, 11:00 UTC10h 55m
2026-07-16 JST089 - Jul 16, 21:10 UTCJul 16, 22:05 UTC55m
2026-07-16 JST089 - Jul 16, 11:45 UTCJul 16, 11:54 UTC10m
2026-07-16 JST086 - Jul 16, 09:40 UTCJul 16, 09:50 UTC10m
2026-07-15 JST086 - Jul 15, 23:40 UTCJul 16, 00:10 UTC30m
2026-07-15 JST087 - Jul 15, 21:00 UTCJul 15, 21:30 UTC30m
2026-07-15 JST087 - Jul 15, 11:45 UTCJul 15, 11:55 UTC10m
2026-07-15 JST088 - Jul 15, 09:45 UTCJul 15, 09:55 UTC10m
2026-07-14 JST108 - Jul 14, 13:25 UTCJul 14, 13:50 UTC25m
2026-07-14 JST108 ADL → PER Jul 14, 08:35 UTCJul 14, 11:35 UTC3h 0m
2026-07-14 JST111 PER → ADL Jul 14, 04:25 UTCJul 14, 07:05 UTC2h 40m
2026-07-13 JST111 PER → PER Jul 13, 12:35 UTCJul 14, 03:05 UTC14h 30m
2026-07-12 JST043 MEL → PER Jul 12, 23:40 UTCJul 13, 10:30 UTC10h 50m
2026-07-12 JST971 PER → MEL Jul 12, 16:25 UTCJul 12, 19:30 UTC3h 5m
2026-07-11 JST71 PER → PER Jul 11, 23:45 UTCJul 12, 13:20 UTC13h 35m
2026-07-10 JST71 PER → PER Jul 10, 23:40 UTCJul 11, 13:10 UTC13h 30m
2026-07-10 JST69 PER → PER Jul 10, 08:05 UTCJul 10, 21:45 UTC13h 41m
2026-07-10 JST80 - Jul 10, 00:00 UTCJul 10, 06:20 UTC6h 20m
2026-07-09 JST81 PER → MNL Jul 9, 15:20 UTCJul 9, 21:45 UTC6h 25m
2026-07-08 JST71 PER → PER Jul 8, 23:50 UTCJul 9, 13:20 UTC13h 30m
2026-07-08 JST69 PER → PER Jul 8, 08:05 UTCJul 8, 22:10 UTC14h 5m
2026-07-07 JST80 - Jul 7, 23:30 UTCJul 8, 06:05 UTC6h 35m
2026-07-07 JST81 PER → MNL Jul 7, 15:05 UTCJul 7, 21:40 UTC6h 35m
2026-07-07 JST108 ADL → PER Jul 7, 08:25 UTCJul 7, 11:25 UTC3h 0m
2026-07-07 JST111 PER → ADL Jul 7, 04:20 UTCJul 7, 07:00 UTC2h 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-OYC page for operator, model, and routing details .

Mode-S 7C4A42 frequently asked

What is Mode-S code 7C4A42?
7C4A42 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-OYC.
Where is Mode-S 7C4A42 registered?
Mode-S code 7C4A42 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C4A42 broadcasting right now?
Yes. Mode-S 7C4A42 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C4A42, octal 37045102, decimal 8,145,474.
What flights does 7C4A42 operate?
Mode-S 7C4A42 has broadcast 20 distinct callsigns, including JST111, JST108, JST043, JST116, JST974.