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 JST111 · 24,525 ft
Flights observed
172
Distinct callsigns
20
Country
AU
Last broadcast
12m ago

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
JST043 - 8 2026-07-12
JST974 - 7 2026-06-28
JST116 - 7 2026-06-23
JST71 - 6 2026-07-11
JST858 - 5 2026-07-01
JST81 - 5 2026-07-09
JST80 - 5 2026-07-10
JST75 - 5 2026-07-01
JST632 Jetstar Airways 5 2026-05-29
JST111 - 5 2026-07-07
JST035 Jetstar Airways 5 2026-06-13
JST975 - 4 2026-06-28
JST971 - 4 2026-07-12
JST76 - 4 2026-07-01
JST34 Jetstar Airways 4 2026-06-12
JST110 - 4 2026-06-22
JST109 Jetstar Airways 4 2026-05-26
JST108 - 4 2026-07-07
JST044 Jetstar Airways 4 2026-06-12
JST039 Jetstar Airways 4 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 JST106 PER → DPS Jul 13, 12:35 UTCJul 14, 02:30 UTC13h 55m
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
2026-07-06 JST111 PER → PER Jul 6, 12:50 UTCJul 7, 02:50 UTC14h 0m
2026-07-06 JST043 MEL → PER Jul 6, 00:00 UTCJul 6, 11:20 UTC11h 20m
2026-07-04 JST043 MEL → MEL Jul 4, 23:55 UTCJul 5, 12:40 UTC12h 45m
2026-07-04 JST033 MEL → MEL Jul 4, 06:20 UTCJul 4, 19:05 UTC12h 45m
2026-07-03 JST33 MEL → MEL Jul 3, 20:30 UTCJul 4, 04:05 UTC7h 35m
2026-07-03 JST973 PER → MEL Jul 3, 09:10 UTCJul 3, 12:35 UTC3h 25m
2026-07-03 JST970 MEL → PER Jul 3, 04:05 UTCJul 3, 07:55 UTC3h 50m
2026-07-03 JST437 - Jul 3, 01:35 UTCJul 3, 02:25 UTC50m
2026-07-03 JST437 - Jul 3, 00:10 UTCJul 3, 01:30 UTC1h 20m
2026-07-02 JST432 - Jul 2, 21:05 UTCJul 2, 22:40 UTC1h 35m
2026-07-02 JST971 PER → MEL Jul 2, 16:00 UTCJul 2, 19:10 UTC3h 10m
2026-07-01 JST71 PER → PER Jul 1, 23:55 UTCJul 2, 13:25 UTC13h 30m
2026-07-01 JST76 - Jul 1, 16:55 UTCJul 1, 22:05 UTC5h 10m
2026-07-01 JST75 - Jul 1, 13:50 UTCJul 1, 14:00 UTC10m
2026-07-01 JST75 - Jul 1, 07:30 UTCJul 1, 12:40 UTC5h 10m
2026-07-01 JST858 - Jul 1, 04:55 UTCJul 1, 05:30 UTC35m
2026-07-01 JST858 - Jul 1, 02:10 UTCJul 1, 02:45 UTC35m
2026-06-30 JST857 PER → ADL Jun 30, 22:30 UTCJul 1, 01:00 UTC2h 30m
2026-06-30 JST98 - Jun 30, 07:45 UTCJun 30, 12:30 UTC4h 45m
2026-06-30 JST97 - Jun 30, 00:45 UTCJun 30, 05:45 UTC5h 0m
2026-06-29 JST76 - Jun 29, 16:25 UTCJun 29, 22:59 UTC6h 35m
2026-06-29 JST75 PER → BKK Jun 29, 08:14 UTCJun 29, 15:00 UTC6h 45m
2026-06-28 JST80 MNL → PER Jun 28, 23:29 UTCJun 29, 05:59 UTC6h 30m
2026-06-28 JST81 PER → MNL Jun 28, 15:14 UTCJun 28, 21:45 UTC6h 30m
2026-06-28 JST974 MEL → PER Jun 28, 06:59 UTCJun 28, 10:35 UTC3h 35m
2026-06-28 JST975 PER → MEL Jun 28, 02:34 UTCJun 28, 05:49 UTC3h 15m
2026-06-27 JST972 MEL → PER Jun 27, 21:55 UTCJun 28, 01:34 UTC3h 40m
2026-06-26 JST121 MEL → MEL Jun 26, 22:40 UTCJun 27, 09:40 UTC11h 0m
2026-06-26 JST034 DPS → MEL Jun 26, 10:15 UTCJun 26, 20:20 UTC10h 5m
2026-06-25 JST80 - Jun 25, 23:34 UTCJun 26, 05:39 UTC6h 5m
2026-06-25 JST81 - Jun 25, 15:24 UTCJun 25, 21:59 UTC6h 35m
2026-06-25 JST98 - Jun 25, 07:15 UTCJun 25, 12:30 UTC5h 15m
2026-06-25 JST97 - Jun 25, 00:44 UTCJun 25, 05:35 UTC4h 50m
2026-06-24 JST76 BKK → PER Jun 24, 15:39 UTCJun 24, 22:10 UTC6h 30m
2026-06-24 JST75 PER → BKK Jun 24, 07:24 UTCJun 24, 14:00 UTC6h 35m
2026-06-24 JST858 - Jun 24, 04:44 UTCJun 24, 05:20 UTC35m

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 JST043, JST974, JST116, JST71, JST858.