Apparatus

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sensors Mode-S transponder

7C7544

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-XF6 · AIRBUS A-321

Hex
7C7544
Octal
37072504
Decimal
8,156,484
Country
AU
Tail
VH-XF6
Type
A321
No current signal · last broadcast 1d ago
Flights observed
107
Distinct callsigns
16
Country
AU
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7C7544.

Country allocation

The ICAO 24-bit address 7C7544 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 16 distinct

Callsign Airline Flights Last seen
QFA7523 Qantas 25 2026-05-05
QFA7524 Qantas 14 2026-05-05
QFA7335 Qantas 7 2026-05-25
QFA7398 Qantas 6 2026-05-28
QFA7390 Qantas 6 2026-05-27
QFA7356 Qantas 6 2026-05-28
QFA7354 Qantas 6 2026-05-27
QFA7340 Qantas 6 2026-05-27
QFA7330 Qantas 6 2026-05-27
QFA7350 Qantas 5 2026-05-26
QFA7353 Qantas 4 2026-05-21
QFA7332 Qantas 4 2026-05-21
QFA7313 Qantas 4 2026-05-25
QFA7305 Qantas 4 2026-05-26
QFA7365 Qantas 3 2026-05-26
QFA7396 Qantas 1 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 QFA7356 MEL → LST May 28, 17:00 UTCMay 28, 17:30 UTC30m
2026-05-28 QFA7398 PER → MEL May 28, 11:20 UTCMay 28, 14:20 UTC3h 0m
2026-05-27 QFA7390 PER → MEL May 27, 17:50 UTCMay 27, 21:55 UTC4h 5m
2026-05-27 QFA7330 BNE → MEL May 27, 15:15 UTCMay 27, 17:00 UTC1h 45m
2026-05-27 QFA7340 SYD → BNE May 27, 12:45 UTCMay 27, 14:00 UTC1h 15m
2026-05-27 QFA7354 MEL → SYD May 27, 10:15 UTCMay 27, 11:25 UTC1h 10m
2026-05-26 QFA7305 BNE → MEL May 26, 16:55 UTCMay 26, 18:40 UTC1h 45m
2026-05-26 QFA7350 MEL → BNE May 26, 13:15 UTCMay 26, 15:20 UTC2h 5m
2026-05-26 QFA7365 LST → MEL May 26, 11:20 UTCMay 26, 11:54 UTC35m
2026-05-25 QFA7356 MEL → LST May 25, 17:35 UTCMay 25, 18:00 UTC25m
2026-05-25 QFA7335 BNE → MEL May 25, 12:35 UTCMay 25, 14:25 UTC1h 50m
2026-05-25 QFA7313 CNS → BNE May 25, 10:10 UTCMay 25, 11:20 UTC1h 10m
2026-05-21 QFA7332 BNE → TSV May 21, 18:45 UTCMay 21, 19:25 UTC40m
2026-05-21 QFA7353 MEL → BNE May 21, 15:40 UTCMay 21, 17:30 UTC1h 50m
2026-05-21 QFA7398 PER → MEL May 21, 11:20 UTCMay 21, 14:30 UTC3h 10m
2026-05-20 QFA7396 BNE → PER May 20, 15:10 UTCMay 20, 20:30 UTC5h 20m
2026-05-20 QFA7340 SYD → BNE May 20, 12:35 UTCMay 20, 13:45 UTC1h 10m
2026-05-20 QFA7354 MEL → SYD May 20, 10:25 UTCMay 20, 11:25 UTC1h 0m
2026-05-19 QFA7305 BNE → MEL May 19, 17:00 UTCMay 19, 19:00 UTC2h 0m
2026-05-19 QFA7350 MEL → BNE May 19, 13:10 UTCMay 19, 15:00 UTC1h 50m
2026-05-19 QFA7350 MEL → BNE May 19, 11:10 UTCMay 19, 11:50 UTC40m
2026-05-18 QFA7356 MEL → LST May 18, 17:05 UTCMay 18, 17:35 UTC30m
2026-05-18 QFA7335 BNE → MEL May 18, 14:05 UTCMay 18, 14:40 UTC35m
2026-05-18 QFA7335 BNE → MEL May 18, 12:45 UTCMay 18, 14:00 UTC1h 15m
2026-05-18 QFA7313 CNS → BNE May 18, 10:40 UTCMay 18, 11:20 UTC40m
2026-05-14 QFA7332 BNE → TSV May 14, 19:30 UTCMay 14, 20:05 UTC35m
2026-05-14 QFA7353 MEL → BNE May 14, 16:20 UTCMay 14, 18:10 UTC1h 50m
2026-05-14 QFA7398 PER → MEL May 14, 11:40 UTCMay 14, 14:45 UTC3h 5m
2026-05-13 QFA7390 PER → MEL May 13, 18:10 UTCMay 13, 22:00 UTC3h 50m
2026-05-13 QFA7330 BNE → MEL May 13, 15:15 UTCMay 13, 17:15 UTC2h 0m
2026-05-13 QFA7340 SYD → BNE May 13, 12:45 UTCMay 13, 13:55 UTC1h 10m
2026-05-13 QFA7354 MEL → SYD May 13, 10:25 UTCMay 13, 11:35 UTC1h 10m
2026-05-12 QFA7305 BNE → MEL May 12, 16:25 UTCMay 12, 18:20 UTC1h 55m
2026-05-12 QFA7350 MEL → BNE May 12, 13:05 UTCMay 12, 15:05 UTC2h 0m
2026-05-12 QFA7365 LST → MEL May 12, 11:20 UTCMay 12, 11:55 UTC35m
2026-05-11 QFA7356 MEL → LST May 11, 17:05 UTCMay 11, 17:35 UTC30m
2026-05-11 QFA7335 BNE → MEL May 11, 12:25 UTCMay 11, 14:25 UTC2h 0m
2026-05-11 QFA7313 CNS → BNE May 11, 10:30 UTCMay 11, 11:05 UTC35m
2026-05-07 QFA7332 BNE → TSV May 7, 19:05 UTCMay 7, 19:45 UTC40m
2026-05-07 QFA7353 MEL → BNE May 7, 16:10 UTCMay 7, 18:00 UTC1h 50m
2026-05-07 QFA7398 PER → MEL May 7, 11:20 UTCMay 7, 14:55 UTC3h 35m
2026-05-06 QFA7390 PER → MEL May 6, 18:30 UTCMay 6, 21:55 UTC3h 25m
2026-05-06 QFA7330 BNE → MEL May 6, 15:30 UTCMay 6, 17:30 UTC2h 0m
2026-05-06 QFA7340 SYD → BNE May 6, 13:10 UTCMay 6, 14:25 UTC1h 15m
2026-05-05 QFA7524 AKL → CHC May 5, 18:45 UTCMay 5, 21:45 UTC3h 0m
2026-05-05 QFA7523 SYD → AKL May 5, 16:06 UTCMay 5, 17:15 UTC1h 10m
2026-05-05 QFA7523 SYD → AKL May 5, 12:00 UTCMay 5, 14:30 UTC2h 30m
2026-05-05 QFA7523 SYD → AKL May 5, 09:10 UTCMay 5, 10:10 UTC1h 0m
2026-05-05 QFA7524 AKL → CHC May 5, 01:15 UTCMay 5, 02:20 UTC1h 5m
2026-05-04 QFA7524 AKL → CHC May 4, 18:20 UTCMay 4, 21:20 UTC3h 1m

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-XF6 page for operator, model, and routing details .

Mode-S 7C7544 frequently asked

What is Mode-S code 7C7544?
7C7544 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-XF6.
Where is Mode-S 7C7544 registered?
Mode-S code 7C7544 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C7544 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C7544, octal 37072504, decimal 8,156,484.
What flights does 7C7544 operate?
Mode-S 7C7544 has broadcast 16 distinct callsigns, including QFA7523, QFA7524, QFA7335, QFA7398, QFA7390.