Apparatus

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sensors Mode-S transponder

7C7542

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-XF4 · AIRBUS A-321

Hex
7C7542
Octal
37072502
Decimal
8,156,482
Country
AU
Tail
VH-XF4
Type
A321
No current signal · last broadcast Jul 23, 19:40 UTC
Flights observed
155
Distinct callsigns
20
Country
AU
Last broadcast
Jul 23, 19:40 UTC

Last known position

Most recent position reported by Mode-S 7C7542.

Country allocation

The ICAO 24-bit address 7C7542 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
QFA7340 Qantas 16 2026-07-21
QFA7398 Qantas 15 2026-07-22
QFA7354 Qantas 14 2026-07-21
QFA7305 Qantas 13 2026-07-23
QFA7356 Qantas 12 2026-07-22
QFA7350 Qantas 12 2026-07-23
QFA7365 Qantas 10 2026-07-23
QFA7390 Qantas 9 2026-07-21
QFA7330 Qantas 9 2026-07-21
QFA7396 - 8 2026-07-15
QFA7523 - 7 2026-07-14
QFA7524 - 5 2026-07-14
QFA7353 - 5 2026-07-02
QFA7335 Qantas 5 2026-06-09
QFA7332 - 4 2026-07-02
QFA7313 Qantas 3 2026-06-09
JQCASS - 3 2026-07-05
QFA7370 - 2 2026-07-16
QFA7357 - 2 2026-06-11
QFA7301 Qantas 1 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 QFA7305 BNE → MEL Jul 23, 17:05 UTCJul 23, 19:30 UTC2h 25m
2026-07-23 QFA7350 MEL → BNE Jul 23, 14:00 UTCJul 23, 15:45 UTC1h 45m
2026-07-23 QFA7365 LST → MEL Jul 23, 11:20 UTCJul 23, 12:00 UTC40m
2026-07-22 QFA7356 MEL → LST Jul 22, 16:35 UTCJul 22, 17:10 UTC35m
2026-07-22 QFA7398 PER → MEL Jul 22, 11:40 UTCJul 22, 15:00 UTC3h 20m
2026-07-21 QFA7390 PER → MEL Jul 21, 18:35 UTCJul 21, 22:30 UTC3h 55m
2026-07-21 QFA7330 BNE → MEL Jul 21, 15:30 UTCJul 21, 17:30 UTC2h 0m
2026-07-21 QFA7340 SYD → BNE Jul 21, 12:45 UTCJul 21, 13:50 UTC1h 5m
2026-07-21 QFA7354 MEL → SYD Jul 21, 10:20 UTCJul 21, 11:20 UTC1h 0m
2026-07-16 QFA7370 - Jul 16, 23:55 UTCJul 17, 00:40 UTC45m
2026-07-16 QFA7356 - Jul 16, 16:55 UTCJul 16, 17:30 UTC35m
2026-07-16 QFA7398 PER → MEL Jul 16, 12:20 UTCJul 16, 15:35 UTC3h 15m
2026-07-15 QFA7396 BNE → PER Jul 15, 16:00 UTCJul 15, 20:50 UTC4h 50m
2026-07-15 QFA7340 SYD → BNE Jul 15, 13:10 UTCJul 15, 14:15 UTC1h 5m
2026-07-14 QFA7524 - Jul 14, 19:30 UTCJul 14, 22:40 UTC3h 10m
2026-07-14 QFA7523 - Jul 14, 17:15 UTCJul 14, 18:20 UTC1h 5m
2026-07-14 QFA7523 SYD → AKL Jul 14, 13:05 UTCJul 14, 15:40 UTC2h 35m
2026-07-14 QFA7354 MEL → SYD Jul 14, 10:30 UTCJul 14, 11:30 UTC1h 0m
2026-07-05 JQCASS MEL → MEL Jul 5, 22:05 UTCJul 5, 22:10 UTC5m
2026-07-05 JQCASS MEL → MEL Jul 5, 21:35 UTCJul 5, 22:00 UTC25m
2026-07-05 JQCASS MEL → MEL Jul 5, 21:20 UTCJul 5, 21:30 UTC10m
2026-07-02 QFA7332 BNE → MEL Jul 2, 19:10 UTCJul 3, 02:50 UTC7h 40m
2026-07-02 QFA7353 MEL → BNE Jul 2, 16:15 UTCJul 2, 18:05 UTC1h 50m
2026-07-02 QFA7398 PER → MEL Jul 2, 11:25 UTCJul 2, 14:40 UTC3h 15m
2026-07-01 QFA7390 MEL → PER Jul 1, 18:05 UTCJul 1, 22:00 UTC3h 55m
2026-07-01 QFA7330 BNE → MEL Jul 1, 15:15 UTCJul 1, 17:15 UTC2h 0m
2026-07-01 QFA7340 SYD → BNE Jul 1, 12:55 UTCJul 1, 14:10 UTC1h 15m
2026-06-30 QFA7524 - Jun 30, 21:30 UTCJun 30, 22:05 UTC35m
2026-06-30 QFA7524 - Jun 30, 19:10 UTCJun 30, 19:30 UTC20m
2026-06-30 QFA7523 SYD → AKL Jun 30, 16:40 UTCJun 30, 17:45 UTC1h 5m
2026-06-30 QFA7523 SYD → AKL Jun 30, 12:40 UTCJun 30, 15:20 UTC2h 40m
2026-06-25 QFA7524 AKL → SYD Jun 25, 16:59 UTCJun 25, 20:14 UTC3h 15m
2026-06-25 QFA7523 SYD → AKL Jun 25, 12:35 UTCJun 25, 15:15 UTC2h 40m
2026-06-25 QFA7524 - Jun 25, 06:14 UTCJun 25, 09:25 UTC3h 10m
2026-06-25 QFA7523 SYD → AKL Jun 25, 03:44 UTCJun 25, 04:54 UTC1h 10m
2026-06-24 QFA7523 SYD → AKL Jun 24, 23:54 UTCJun 25, 02:35 UTC2h 40m
2026-06-24 QFA7301 SYD → PER Jun 24, 09:39 UTCJun 24, 10:45 UTC1h 5m
2026-06-18 QFA7305 BNE → MEL Jun 18, 16:55 UTCJun 18, 19:00 UTC2h 5m
2026-06-18 QFA7350 MEL → BNE Jun 18, 13:35 UTCJun 18, 15:35 UTC2h 0m
2026-06-18 QFA7365 - Jun 18, 11:25 UTCJun 18, 12:10 UTC45m
2026-06-17 QFA7356 - Jun 17, 17:35 UTCJun 17, 18:05 UTC30m
2026-06-17 QFA7398 PER → MEL Jun 17, 11:35 UTCJun 17, 15:00 UTC3h 25m
2026-06-16 QFA7396 BNE → PER Jun 16, 15:40 UTCJun 16, 20:45 UTC5h 6m
2026-06-16 QFA7340 SYD → BNE Jun 16, 13:09 UTCJun 16, 14:25 UTC1h 15m
2026-06-16 QFA7354 MEL → SYD Jun 16, 10:20 UTCJun 16, 11:25 UTC1h 5m
2026-06-11 QFA7357 MEL → MEL Jun 11, 18:35 UTCJun 11, 21:30 UTC2h 55m
2026-06-11 QFA7305 BNE → MEL Jun 11, 15:35 UTCJun 11, 17:40 UTC2h 5m
2026-06-11 QFA7340 SYD → BNE Jun 11, 12:35 UTCJun 11, 13:55 UTC1h 20m
2026-06-11 QFA7354 MEL → SYD Jun 11, 10:15 UTCJun 11, 11:15 UTC1h 0m
2026-06-10 QFA7305 BNE → MEL Jun 10, 16:15 UTCJun 10, 18:15 UTC2h 0m

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-XF4 page for operator, model, and routing details .

Mode-S 7C7542 frequently asked

What is Mode-S code 7C7542?
7C7542 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-XF4.
Where is Mode-S 7C7542 registered?
Mode-S code 7C7542 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C7542 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 19:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C7542, octal 37072502, decimal 8,156,482.
What flights does 7C7542 operate?
Mode-S 7C7542 has broadcast 20 distinct callsigns, including QFA7340, QFA7398, QFA7354, QFA7305, QFA7356.