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
Transponder active on ground
Flights observed
84
Distinct callsigns
20
Country
AU
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 7C4A42.

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
JST974 Jetstar Airways 5 2026-04-15
JST632 Jetstar Airways 5 2026-05-29
JST116 Jetstar Airways 5 2026-05-24
JST043 Jetstar Airways 5 2026-05-28
JST109 Jetstar Airways 4 2026-05-26
JST035 Jetstar Airways 4 2026-05-19
JST633 Jetstar Airways 3 2026-05-29
JST34 Jetstar Airways 3 2026-04-21
JST111 Jetstar Airways 3 2026-04-16
JST110 Jetstar Airways 3 2026-05-22
JST108 Jetstar Airways 3 2026-04-16
JST050 Jetstar Airways 3 2026-05-29
JST044 Jetstar Airways 3 2026-05-15
JST034 Jetstar Airways 3 2026-05-14
JST975 Jetstar Airways 2 2026-04-15
JST777 - 2 2026-04-13
JST559 Jetstar Airways 2 2026-05-19
JST117 - 2 2026-04-14
JST049 Jetstar Airways 2 2026-05-18
JST031 Jetstar Airways 2 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JST632 AVV → BNE May 29, 23:40 UTCMay 30, 00:30 UTC50m
2026-05-29 JST050 DPS → AVV May 29, 08:40 UTCMay 29, 21:10 UTC12h 30m
2026-05-29 JST633 BNE → AVV May 29, 04:40 UTCMay 29, 06:35 UTC1h 55m
2026-05-29 JST632 AVV → BNE May 29, 00:00 UTCMay 29, 01:55 UTC1h 55m
2026-05-28 JST050 DPS → AVV May 28, 20:00 UTCMay 28, 21:15 UTC1h 15m
2026-05-28 JST089 DPS → NTL May 28, 12:25 UTCMay 28, 12:35 UTC10m
2026-05-28 JST043 MEL → DPS May 28, 00:10 UTCMay 28, 01:05 UTC55m
2026-05-27 JST971 PER → MEL May 27, 15:55 UTCMay 27, 19:05 UTC3h 10m
2026-05-26 JST109 DPS → PER May 26, 23:05 UTCMay 27, 07:30 UTC8h 26m
2026-05-25 JST71 PER → HKT May 25, 23:45 UTCMay 26, 13:29 UTC13h 45m
2026-05-25 JST76 BKK → PER May 25, 15:35 UTCMay 25, 22:00 UTC6h 25m
2026-05-25 JST75 PER → BKK May 25, 07:20 UTCMay 25, 13:50 UTC6h 30m
2026-05-25 JST858 ADL → PER May 25, 02:05 UTCMay 25, 05:15 UTC3h 10m
2026-05-24 JST116 PER → DPS May 24, 09:20 UTCMay 24, 18:50 UTC9h 30m
2026-05-23 JST109 DPS → PER May 23, 21:05 UTCMay 24, 07:45 UTC10h 40m
2026-05-22 JST110 PER → DPS May 22, 23:15 UTCMay 23, 08:00 UTC8h 45m
2026-05-22 JST116 PER → DPS May 22, 09:05 UTCMay 22, 17:15 UTC8h 10m
2026-05-21 JST110 PER → DPS May 21, 23:00 UTCMay 22, 07:10 UTC8h 10m
2026-05-21 JST116 PER → DPS May 21, 09:20 UTCMay 21, 17:30 UTC8h 10m
2026-05-20 JST031 MEL → DPS May 20, 20:50 UTCMay 21, 07:40 UTC10h 50m
2026-05-19 JST043 MEL → DPS May 19, 23:45 UTCMay 20, 12:25 UTC12h 41m
2026-05-19 JST035 MEL → DPS May 19, 08:20 UTCMay 19, 21:05 UTC12h 45m
2026-05-19 JST559 BNE → MEL May 19, 02:45 UTCMay 19, 04:50 UTC2h 5m
2026-05-18 JST632 AVV → BNE May 18, 23:35 UTCMay 19, 01:40 UTC2h 5m
2026-05-18 JST049 AVV → DPS May 18, 08:05 UTCMay 18, 21:25 UTC13h 19m
2026-05-18 JST633 BNE → AVV May 18, 03:05 UTCMay 18, 05:15 UTC2h 10m
2026-05-18 JST632 AVV → BNE May 18, 00:00 UTCMay 18, 01:55 UTC1h 55m
2026-05-17 JST049 AVV → DPS May 17, 08:20 UTCMay 17, 21:25 UTC13h 5m
2026-05-17 JST633 BNE → AVV May 17, 02:45 UTCMay 17, 04:45 UTC2h 0m
2026-05-16 JST558 MEL → BNE May 16, 23:30 UTCMay 17, 01:20 UTC1h 50m
2026-05-16 JST035 MEL → DPS May 16, 07:51 UTCMay 16, 20:35 UTC12h 45m
2026-05-15 JST044 DPS → MEL May 15, 21:30 UTCMay 15, 22:40 UTC1h 10m
2026-05-15 JST087 SIN → DPS May 15, 13:45 UTCMay 15, 14:00 UTC15m
2026-05-15 JST043 MEL → DPS May 15, 00:15 UTCMay 15, 01:25 UTC1h 10m
2026-05-14 JST034 DPS → MEL May 14, 06:30 UTCMay 14, 20:55 UTC14h 25m
2026-05-13 JST112 PER → DPS May 13, 12:00 UTCMay 14, 01:35 UTC13h 35m
2026-05-12 JST040 DPS → SYD May 12, 21:05 UTCMay 13, 10:25 UTC13h 20m
2026-05-12 JST120 NAN → SYD May 12, 08:25 UTCMay 12, 09:05 UTC40m
2026-05-11 JST038 DPS → SYD May 11, 06:45 UTCMay 11, 20:10 UTC13h 25m
2026-05-10 JST113 DPS → PER May 10, 11:40 UTCMay 11, 01:20 UTC13h 40m
2026-05-09 JST119 SYD → NAN May 9, 23:09 UTCMay 10, 09:10 UTC10h 0m
2026-05-09 JST035 MEL → DPS May 9, 08:00 UTCMay 9, 20:34 UTC12h 35m
2026-04-25 JST044 DPS → MEL Apr 25, 23:30 UTCApr 26, 13:30 UTC14h 0m
2026-04-25 JST035 MEL → DPS Apr 25, 07:50 UTCApr 25, 21:35 UTC13h 45m
2026-04-25 JST559 BNE → MEL Apr 25, 02:10 UTCApr 25, 04:15 UTC2h 5m
2026-04-24 JST632 AVV → BNE Apr 24, 23:00 UTCApr 25, 01:00 UTC2h 0m
2026-04-24 JST050 DPS → AVV Apr 24, 19:40 UTCApr 24, 20:55 UTC1h 15m
2026-04-23 JST043 MEL → DPS Apr 23, 23:50 UTCApr 24, 00:45 UTC55m
2026-04-22 JST032 DPS → MEL Apr 22, 21:05 UTCApr 23, 09:40 UTC12h 35m
2026-04-22 JST033 CNS → MEL Apr 22, 06:05 UTCApr 22, 18:55 UTC12h 50m

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?
Mode-S 7C4A42 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 7C4A42, octal 37045102, decimal 8,145,474.
What flights does 7C4A42 operate?
Mode-S 7C4A42 has broadcast 20 distinct callsigns, including JST974, JST632, JST116, JST043, JST109.