Apparatus

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sensors Mode-S transponder

7C4A54

ICAO 24-bit transponder address · allocated to Australia

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

Hex
7C4A54
Octal
37045124
Decimal
8,145,492
Country
AU
Tail
VH-OYU
Type
A21N
No current signal · last broadcast 4h ago
Flights observed
123
Distinct callsigns
20
Country
AU
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 7C4A54.

Country allocation

The ICAO 24-bit address 7C4A54 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
JST986 Jetstar Airways 12 2026-05-30
JST987 Jetstar Airways 10 2026-05-30
JST508 Jetstar Airways 9 2026-05-29
JST505 Jetstar Airways 9 2026-05-29
JST039 Jetstar Airways 4 2026-05-10
JST031 Jetstar Airways 4 2026-05-12
JST087 Jetstar Airways 3 2026-05-24
JST800 Jetstar Airways 2 2026-04-14
JST689 Jetstar Airways 2 2026-04-23
JST688 Jetstar Airways 2 2026-04-23
JST633 Jetstar Airways 2 2026-04-20
JST567 Jetstar Airways 2 2026-05-26
JST566 Jetstar Airways 2 2026-05-26
JST499 Jetstar Airways 2 2026-04-23
JST498 Jetstar Airways 2 2026-04-22
JST33 Jetstar Airways 2 2026-05-13
JST204 Jetstar Airways 2 2026-04-16
JST203 Jetstar Airways 2 2026-04-16
JST127 Jetstar Airways 2 2026-04-24
JST125 Jetstar Airways 2 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 JST987 PER → SYD May 30, 08:10 UTCMay 30, 11:30 UTC3h 20m
2026-05-30 JST986 SYD → PER May 30, 02:15 UTCMay 30, 07:00 UTC4h 45m
2026-05-29 JST508 MEL → SYD May 29, 23:40 UTCMay 30, 00:40 UTC1h 0m
2026-05-29 JST505 SYD → MEL May 29, 21:10 UTCMay 29, 22:25 UTC1h 15m
2026-05-29 JST987 PER → SYD May 29, 08:10 UTCMay 29, 11:45 UTC3h 35m
2026-05-29 JST986 SYD → PER May 29, 03:25 UTCMay 29, 07:00 UTC3h 35m
2026-05-29 JST986 SYD → PER May 29, 02:10 UTCMay 29, 02:45 UTC35m
2026-05-28 JST403 OOL → SYD May 28, 22:15 UTCMay 28, 23:25 UTC1h 10m
2026-05-28 JST400 SYD → OOL May 28, 20:10 UTCMay 28, 21:10 UTC1h 0m
2026-05-28 JST987 PER → SYD May 28, 08:25 UTCMay 28, 12:10 UTC3h 45m
2026-05-28 JST986 SYD → PER May 28, 02:25 UTCMay 28, 07:10 UTC4h 45m
2026-05-27 JST508 MEL → SYD May 27, 23:45 UTCMay 28, 00:50 UTC1h 5m
2026-05-27 JST505 SYD → MEL May 27, 21:15 UTCMay 27, 22:30 UTC1h 15m
2026-05-27 JST520 MEL → SYD May 27, 05:49 UTCMay 27, 07:05 UTC1h 16m
2026-05-27 JST517 SYD → MEL May 27, 03:29 UTCMay 27, 04:34 UTC1h 5m
2026-05-26 JST763 ADL → SYD May 26, 23:49 UTCMay 27, 01:29 UTC1h 40m
2026-05-26 JST776 MEL → ADL May 26, 21:25 UTCMay 26, 22:25 UTC1h 0m
2026-05-26 JST971 PER → MEL May 26, 16:00 UTCMay 26, 19:20 UTC3h 20m
2026-05-26 JST964 BNE → PER May 26, 09:04 UTCMay 26, 14:00 UTC4h 55m
2026-05-26 JST566 MEL → BNE May 26, 05:30 UTCMay 26, 07:24 UTC1h 55m
2026-05-26 JST567 BNE → MEL May 26, 02:10 UTCMay 26, 04:00 UTC1h 50m
2026-05-25 JST814 SYD → BNE May 25, 23:49 UTCMay 26, 01:05 UTC1h 15m
2026-05-25 JST811 BNE → SYD May 25, 21:15 UTCMay 25, 22:30 UTC1h 15m
2026-05-25 JST566 MEL → BNE May 25, 05:10 UTCMay 25, 07:10 UTC2h 0m
2026-05-25 JST567 BNE → MEL May 25, 02:15 UTCMay 25, 04:05 UTC1h 50m
2026-05-24 JST087 SIN → DPS May 24, 20:40 UTCMay 24, 21:05 UTC25m
2026-05-23 JST088 NTL → DPS May 23, 23:50 UTCMay 24, 00:35 UTC45m
2026-05-23 JST089 DPS → NTL May 23, 20:25 UTCMay 23, 21:15 UTC50m
2026-05-23 JST089 DPS → NTL May 23, 12:00 UTCMay 23, 12:10 UTC10m
2026-05-23 JST086 DPS → SIN May 23, 09:50 UTCMay 23, 10:00 UTC10m
2026-05-22 JST086 DPS → SIN May 22, 23:20 UTCMay 22, 23:50 UTC30m
2026-05-22 JST087 SIN → DPS May 22, 20:25 UTCMay 22, 20:50 UTC25m
2026-05-22 JST087 SIN → DPS May 22, 12:00 UTCMay 22, 12:15 UTC15m
2026-05-22 JST043 MEL → DPS May 22, 00:10 UTCMay 22, 01:05 UTC55m
2026-05-19 JST8998 SYD → MEL May 19, 09:25 UTCMay 19, 10:35 UTC1h 10m
2026-05-14 JST033 CNS → MEL May 14, 07:00 UTCMay 14, 07:55 UTC55m
2026-05-13 JST33 MEL → DPS May 13, 21:20 UTCMay 14, 04:45 UTC7h 25m
2026-05-12 JST031 MEL → DPS May 12, 20:50 UTCMay 13, 09:50 UTC13h 0m
2026-05-12 JST033 CNS → MEL May 12, 06:00 UTCMay 12, 18:50 UTC12h 50m
2026-05-12 JST33 MEL → DPS May 12, 03:15 UTCMay 12, 03:50 UTC35m
2026-05-11 JST34 DPS → MEL May 11, 20:30 UTCMay 11, 20:55 UTC25m
2026-05-10 JST039 SYD → DPS May 10, 20:30 UTCMay 11, 09:30 UTC13h 0m
2026-05-09 JST040 DPS → SYD May 9, 20:34 UTCMay 10, 09:55 UTC13h 20m
2026-05-09 JST987 PER → SYD May 9, 08:10 UTCMay 9, 12:20 UTC4h 10m
2026-05-09 JST986 SYD → PER May 9, 02:05 UTCMay 9, 06:05 UTC4h 0m
2026-05-08 JST508 MEL → SYD May 8, 23:40 UTCMay 9, 00:45 UTC1h 5m
2026-05-08 JST505 SYD → MEL May 8, 21:05 UTCMay 8, 22:05 UTC1h 0m
2026-05-08 JST987 PER → SYD May 8, 08:24 UTCMay 8, 12:44 UTC4h 20m
2026-05-08 JST986 SYD → PER May 8, 03:14 UTCMay 8, 07:20 UTC4h 5m
2026-05-08 JST508 MEL → SYD May 8, 00:14 UTCMay 8, 01:29 UTC1h 15m

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

Mode-S 7C4A54 frequently asked

What is Mode-S code 7C4A54?
7C4A54 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-OYU.
Where is Mode-S 7C4A54 registered?
Mode-S code 7C4A54 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C4A54 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C4A54, octal 37045124, decimal 8,145,492.
What flights does 7C4A54 operate?
Mode-S 7C4A54 has broadcast 20 distinct callsigns, including JST986, JST987, JST508, JST505, JST039.