Apparatus

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sensors Mode-S transponder

7C4A53

ICAO 24-bit transponder address · allocated to Australia

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

Hex
7C4A53
Octal
37045123
Decimal
8,145,491
Country
AU
Tail
VH-OYT
Type
A21N
No current signal · last broadcast Jul 26, 21:20 UTC
Flights observed
279
Distinct callsigns
20
Country
AU
Last broadcast
Jul 26, 21:20 UTC

Last known position

Most recent position reported by Mode-S 7C4A53.

Country allocation

The ICAO 24-bit address 7C4A53 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
JST97 Jetstar Airways 10 2026-07-25
JST974 Jetstar Airways 9 2026-07-21
JST972 Jetstar Airways 9 2026-07-20
JST81 Jetstar Airways 9 2026-07-23
JST98 Jetstar Airways 8 2026-07-25
JST975 Jetstar Airways 8 2026-07-21
JST80 Jetstar Airways 8 2026-07-24
JST75 Jetstar Airways 8 2026-07-24
JST971 - 7 2026-07-18
JST76 Jetstar Airways 7 2026-07-24
JST034 Jetstar Airways 7 2026-05-31
JST121 Jetstar Airways 6 2026-05-31
JST043 - 6 2026-07-12
JST858 Jetstar Airways 5 2026-05-17
JST857 Jetstar Airways 5 2026-05-16
JST793 - 5 2026-07-19
JST499 - 5 2026-07-06
JST498 - 5 2026-07-05
JST34 Jetstar Airways 5 2026-07-26
JST33 Jetstar Airways 5 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JST34 DPS → MEL Jul 26, 20:55 UTCJul 26, 21:20 UTC25m
2026-07-25 JST032 DPS → MEL Jul 25, 22:55 UTCJul 26, 09:35 UTC10h 41m
2026-07-25 JST98 SIN → PER Jul 25, 10:40 UTCJul 25, 15:25 UTC4h 45m
2026-07-25 JST97 PER → SIN Jul 25, 03:20 UTCJul 25, 08:55 UTC5h 35m
2026-07-24 JST76 BKK → PER Jul 24, 19:30 UTCJul 25, 01:50 UTC6h 20m
2026-07-24 JST75 PER → BKK Jul 24, 10:55 UTCJul 24, 17:40 UTC6h 45m
2026-07-24 JST80 MNL → PER Jul 24, 02:45 UTCJul 24, 09:10 UTC6h 25m
2026-07-23 JST81 PER → MNL Jul 23, 18:10 UTCJul 24, 00:35 UTC6h 25m
2026-07-22 JST71 PER → HKT Jul 22, 23:45 UTCJul 23, 13:25 UTC13h 40m
2026-07-22 JST70 HKT → PER Jul 22, 12:10 UTCJul 22, 22:05 UTC9h 55m
2026-07-22 JST70 HKT → PER Jul 22, 00:15 UTCJul 22, 22:05 UTC21h 50m
2026-07-21 JST81 PER → MNL Jul 21, 15:20 UTCJul 21, 22:15 UTC6h 55m
2026-07-21 JST974 ADL → PER Jul 21, 06:35 UTCJul 21, 10:35 UTC4h 0m
2026-07-21 JST975 PER → ADL Jul 21, 02:00 UTCJul 21, 05:05 UTC3h 5m
2026-07-20 JST972 MEL → PER Jul 20, 20:45 UTCJul 21, 00:35 UTC3h 49m
2026-07-20 JST973 PER → MEL Jul 20, 08:00 UTCJul 20, 11:00 UTC3h 0m
2026-07-20 JST970 MEL → PER Jul 20, 02:45 UTCJul 20, 06:40 UTC3h 55m
2026-07-19 JST437 OOL → MEL Jul 19, 23:35 UTCJul 20, 01:25 UTC1h 50m
2026-07-19 JST432 - Jul 19, 20:50 UTCJul 19, 22:30 UTC1h 40m
2026-07-19 JST449 - Jul 19, 11:30 UTCJul 19, 13:20 UTC1h 50m
2026-07-19 JST446 - Jul 19, 08:35 UTCJul 19, 10:15 UTC1h 40m
2026-07-19 JST521 SYD → MEL Jul 19, 06:25 UTCJul 19, 07:30 UTC1h 5m
2026-07-19 JST516 MEL → SYD Jul 19, 04:15 UTCJul 19, 05:25 UTC1h 10m
2026-07-19 JST793 MCY → MEL Jul 19, 00:10 UTCJul 19, 02:20 UTC2h 10m
2026-07-18 JST792 MEL → MCY Jul 18, 21:15 UTCJul 18, 23:05 UTC1h 50m
2026-07-18 JST971 PER → MEL Jul 18, 16:10 UTCJul 18, 19:20 UTC3h 10m
2026-07-17 JST71 PER → HKT Jul 17, 23:45 UTCJul 18, 13:15 UTC13h 31m
2026-07-17 JST69 PER → HKT Jul 17, 08:35 UTCJul 17, 21:55 UTC13h 20m
2026-07-17 JST80 - Jul 17, 00:40 UTCJul 17, 06:54 UTC6h 15m
2026-07-16 JST81 PER → MNL Jul 16, 16:00 UTCJul 16, 22:30 UTC6h 30m
2026-07-16 JST974 MEL → PER Jul 16, 06:45 UTCJul 16, 10:35 UTC3h 50m
2026-07-16 JST535 SYD → MEL Jul 16, 03:40 UTCJul 16, 04:45 UTC1h 5m
2026-07-16 JST534 MEL → SYD Jul 16, 01:30 UTCJul 16, 02:40 UTC1h 10m
2026-07-15 JST702 MEL → MEL Jul 15, 21:10 UTCJul 16, 00:15 UTC3h 5m
2026-07-15 JST916 MEL → MEL Jul 15, 06:55 UTCJul 15, 13:25 UTC6h 30m
2026-07-15 JST519 SYD → MEL Jul 15, 04:35 UTCJul 15, 05:45 UTC1h 10m
2026-07-15 JST512 MEL → SYD Jul 15, 02:35 UTCJul 15, 03:35 UTC1h 0m
2026-07-15 JST509 SYD → MEL Jul 15, 00:05 UTCJul 15, 01:20 UTC1h 15m
2026-07-14 JST502 MEL → SYD Jul 14, 21:45 UTCJul 14, 22:55 UTC1h 9m
2026-07-14 JST449 - Jul 14, 11:35 UTCJul 14, 13:35 UTC2h 0m
2026-07-14 JST446 - Jul 14, 08:45 UTCJul 14, 10:30 UTC1h 45m
2026-07-14 JST521 SYD → MEL Jul 14, 06:15 UTCJul 14, 07:20 UTC1h 5m
2026-07-14 JST516 MEL → SYD Jul 14, 04:05 UTCJul 14, 05:05 UTC1h 0m
2026-07-14 JST793 MCY → MEL Jul 14, 00:35 UTCJul 14, 02:45 UTC2h 10m
2026-07-13 JST792 MEL → MCY Jul 13, 21:40 UTCJul 13, 23:35 UTC1h 55m
2026-07-13 JST973 PER → MEL Jul 13, 08:01 UTCJul 13, 11:10 UTC3h 10m
2026-07-13 JST970 MEL → PER Jul 13, 03:05 UTCJul 13, 06:55 UTC3h 50m
2026-07-12 JST437 - Jul 12, 23:25 UTCJul 13, 01:30 UTC2h 5m
2026-07-12 JST432 - Jul 12, 20:45 UTCJul 12, 22:25 UTC1h 40m
2026-07-12 JST043 MEL → MEL Jul 12, 00:30 UTCJul 12, 13:05 UTC12h 35m

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

Mode-S 7C4A53 frequently asked

What is Mode-S code 7C4A53?
7C4A53 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-OYT.
Where is Mode-S 7C4A53 registered?
Mode-S code 7C4A53 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C4A53 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C4A53, octal 37045123, decimal 8,145,491.
What flights does 7C4A53 operate?
Mode-S 7C4A53 has broadcast 20 distinct callsigns, including JST97, JST974, JST972, JST81, JST98.