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 Jul 26, 21:45 UTC
Flights observed
326
Distinct callsigns
20
Country
AU
Last broadcast
Jul 26, 21:45 UTC

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 13 2026-06-01
JST987 Jetstar Airways 12 2026-06-01
JST565 Jetstar Airways 11 2026-07-18
JST564 - 11 2026-07-19
JST508 Jetstar Airways 11 2026-05-31
JST505 Jetstar Airways 11 2026-05-31
JST964 - 10 2026-07-17
JST829 - 9 2026-07-19
JST828 - 9 2026-07-19
JST965 - 8 2026-07-17
JST567 Jetstar Airways 8 2026-07-22
JST566 Jetstar Airways 7 2026-07-21
JST800 - 6 2026-07-13
JST057 - 6 2026-07-07
JST824 - 5 2026-07-20
JST823 Jetstar Airways 5 2026-07-20
JST814 Jetstar Airways 5 2026-07-20
JST811 Jetstar Airways 5 2026-07-20
JST801 - 5 2026-07-14
JST499 Jetstar Airways 5 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JQTEST MEL → MEL Jul 26, 21:20 UTCJul 26, 21:35 UTC15m
2026-07-26 JQTEST MEL → MEL Jul 26, 21:00 UTCJul 26, 21:15 UTC15m
2026-07-26 JST949 CNS → MEL Jul 26, 07:50 UTCJul 26, 14:45 UTC6h 55m
2026-07-26 JST519 SYD → MEL Jul 26, 05:15 UTCJul 26, 06:25 UTC1h 10m
2026-07-26 JST512 MEL → SYD Jul 26, 02:45 UTCJul 26, 03:55 UTC1h 10m
2026-07-26 JST509 SYD → MEL Jul 26, 00:15 UTCJul 26, 01:30 UTC1h 15m
2026-07-25 JST502 MEL → SYD Jul 25, 22:00 UTCJul 25, 22:55 UTC55m
2026-07-25 JST451 OOL → MEL Jul 25, 06:45 UTCJul 25, 08:45 UTC2h 0m
2026-07-25 JST448 MEL → OOL Jul 25, 03:40 UTCJul 25, 05:25 UTC1h 45m
2026-07-25 JST777 ADL → MEL Jul 25, 00:55 UTCJul 25, 02:00 UTC1h 5m
2026-07-24 JST776 MEL → ADL Jul 24, 22:20 UTCJul 24, 23:25 UTC1h 5m
2026-07-24 JST948 MEL → CNS Jul 24, 08:40 UTCJul 24, 15:40 UTC7h 0m
2026-07-24 JST519 SYD → MEL Jul 24, 05:50 UTCJul 24, 07:05 UTC1h 15m
2026-07-24 JST512 MEL → SYD Jul 24, 03:30 UTCJul 24, 04:35 UTC1h 5m
2026-07-24 JST509 SYD → MEL Jul 24, 00:45 UTCJul 24, 02:05 UTC1h 20m
2026-07-23 JST502 MEL → SYD Jul 23, 22:15 UTCJul 23, 23:15 UTC1h 0m
2026-07-23 JST971 PER → MEL Jul 23, 16:20 UTCJul 23, 19:40 UTC3h 20m
2026-07-23 JST974 ADL → PER Jul 23, 10:30 UTCJul 23, 11:00 UTC30m
2026-07-23 JST974 ADL → PER Jul 23, 07:25 UTCJul 23, 08:35 UTC1h 10m
2026-07-23 JST535 SYD → MEL Jul 23, 04:05 UTCJul 23, 05:25 UTC1h 20m
2026-07-23 BLEED MEL → SYD Jul 23, 01:45 UTCJul 23, 02:45 UTC1h 0m
2026-07-22 JST567 BNE → MEL Jul 22, 03:30 UTCJul 22, 05:25 UTC1h 55m
2026-07-21 JST566 MEL → BNE Jul 21, 06:40 UTCJul 21, 08:25 UTC1h 45m
2026-07-21 JST567 BNE → MEL Jul 21, 03:00 UTCJul 21, 05:10 UTC2h 10m
2026-07-20 JST814 SYD → BNE Jul 20, 23:45 UTCJul 21, 00:55 UTC1h 10m
2026-07-20 JST811 BNE → SYD Jul 20, 21:15 UTCJul 20, 22:30 UTC1h 15m
2026-07-20 JST824 - Jul 20, 11:25 UTCJul 20, 12:30 UTC1h 5m
2026-07-20 JST823 BNE → SYD Jul 20, 09:10 UTCJul 20, 10:20 UTC1h 10m
2026-07-20 JST566 MEL → BNE Jul 20, 06:05 UTCJul 20, 07:50 UTC1h 45m
2026-07-20 JST567 BNE → MEL Jul 20, 03:00 UTCJul 20, 05:05 UTC2h 5m
2026-07-19 JST928 BNE → CNS Jul 19, 20:25 UTCJul 20, 01:25 UTC5h 0m
2026-07-19 JST824 SYD → BNE Jul 19, 11:25 UTCJul 19, 12:30 UTC1h 5m
2026-07-19 JST823 BNE → SYD Jul 19, 09:00 UTCJul 19, 10:20 UTC1h 20m
2026-07-19 JST828 SYD → BNE Jul 19, 06:00 UTCJul 19, 07:10 UTC1h 10m
2026-07-19 JST829 BNE → SYD Jul 19, 03:50 UTCJul 19, 05:00 UTC1h 10m
2026-07-19 JST564 MEL → BNE Jul 19, 00:40 UTCJul 19, 02:30 UTC1h 50m
2026-07-18 JST565 BNE → MEL Jul 18, 21:25 UTCJul 18, 23:30 UTC2h 5m
2026-07-18 JST828 SYD → BNE Jul 18, 07:50 UTCJul 18, 08:55 UTC1h 5m
2026-07-18 JST829 BNE → SYD Jul 18, 05:25 UTCJul 18, 06:40 UTC1h 15m
2026-07-18 JST564 MEL → BNE Jul 18, 02:14 UTCJul 18, 04:05 UTC1h 51m
2026-07-17 JST565 BNE → MEL Jul 17, 22:55 UTCJul 18, 00:50 UTC1h 55m
2026-07-17 JST965 PER → BNE Jul 17, 17:35 UTCJul 17, 21:39 UTC4h 5m
2026-07-17 JST964 - Jul 17, 15:49 UTCJul 17, 16:19 UTC30m
2026-07-17 JST964 - Jul 17, 11:39 UTCJul 17, 12:30 UTC50m
2026-07-17 JST828 SYD → BNE Jul 17, 07:20 UTCJul 17, 08:30 UTC1h 10m
2026-07-17 JST829 BNE → SYD Jul 17, 04:44 UTCJul 17, 06:00 UTC1h 15m
2026-07-17 JST564 MEL → BNE Jul 17, 01:09 UTCJul 17, 03:10 UTC2h 0m
2026-07-16 JST565 BNE → MEL Jul 16, 22:05 UTCJul 16, 23:59 UTC1h 55m
2026-07-15 JST566 MEL → BNE Jul 15, 05:35 UTCJul 15, 07:25 UTC1h 50m
2026-07-15 JST567 BNE → MEL Jul 15, 02:15 UTCJul 15, 04:20 UTC2h 5m

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 Jul 26, 21:45 UTC.
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, JST565, JST564, JST508.