Apparatus

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sensors Mode-S transponder

7C531C

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-QPA · AIRBUS A-330-300 · operated by QANTAS AIRWAYS LIMITED

Hex
7C531C
Octal
37051434
Decimal
8,147,740
Country
AU
Tail
VH-QPA
Type
A333
No current signal · last broadcast 2h ago
Flights observed
100
Distinct callsigns
16
Country
AU
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 7C531C.

Country allocation

The ICAO 24-bit address 7C531C 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
QFA59 Qantas 12 2026-05-29
QFA60 Qantas 11 2026-05-30
QFA24 Qantas 10 2026-05-27
QFA23 Qantas 10 2026-05-27
QFA127 Qantas 10 2026-05-22
QFA128 Qantas 9 2026-05-23
QFA30 Qantas 7 2026-05-22
QFA29 Qantas 5 2026-05-23
QFA20 Qantas 5 2026-05-25
QFA19 Qantas 5 2026-05-25
QFA79 Qantas 4 2026-05-04
QFA62 Qantas 4 2026-05-05
QFA80 Qantas 3 2026-05-04
QFA61 Qantas 3 2026-05-04
QFA6003 Qantas 1 2026-05-10
QFA51 Qantas 1 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 QFA60 HND → SYD May 30, 01:00 UTCMay 30, 02:10 UTC1h 10m
2026-05-29 QFA60 HND → SYD May 29, 17:00 UTCMay 30, 00:30 UTC7h 30m
2026-05-29 QFA59 SYD → HND May 29, 14:30 UTCMay 29, 15:05 UTC35m
2026-05-29 QFA59 SYD → HND May 29, 05:50 UTCMay 29, 08:00 UTC2h 10m
2026-05-27 QFA24 BKK → SYD May 27, 11:25 UTCMay 27, 20:25 UTC9h 0m
2026-05-27 QFA23 SYD → BKK May 27, 00:04 UTCMay 27, 09:00 UTC8h 55m
2026-05-26 QFA24 BKK → SYD May 26, 11:50 UTCMay 26, 20:34 UTC8h 45m
2026-05-26 QFA23 SYD → BKK May 26, 01:00 UTCMay 26, 10:05 UTC9h 5m
2026-05-25 QFA20 MNL → SYD May 25, 13:35 UTCMay 25, 20:34 UTC7h 0m
2026-05-25 QFA19 SYD → MNL May 25, 03:05 UTCMay 25, 11:20 UTC8h 15m
2026-05-23 QFA128 HKG → SYD May 23, 13:50 UTCMay 23, 20:50 UTC7h 0m
2026-05-23 QFA128 HKG → SYD May 23, 12:40 UTCMay 23, 12:55 UTC15m
2026-05-23 QFA29 MEL → LHR May 23, 09:45 UTCMay 23, 10:00 UTC15m
2026-05-23 QFA29 MEL → LHR May 23, 00:40 UTCMay 23, 08:45 UTC8h 4m
2026-05-22 QFA30 HKG → MEL May 22, 14:15 UTCMay 22, 21:20 UTC7h 5m
2026-05-22 QFA30 HKG → MEL May 22, 13:00 UTCMay 22, 13:25 UTC25m
2026-05-22 QFA127 SYD → HKG May 22, 09:35 UTCMay 22, 09:55 UTC20m
2026-05-22 QFA127 SYD → HKG May 22, 00:50 UTCMay 22, 08:35 UTC7h 45m
2026-05-20 QFA60 HND → SYD May 20, 13:10 UTCMay 20, 22:30 UTC9h 20m
2026-05-20 QFA59 SYD → HND May 20, 01:50 UTCMay 20, 11:20 UTC9h 31m
2026-05-19 QFA60 HND → SYD May 19, 14:55 UTCMay 19, 23:50 UTC8h 55m
2026-05-19 QFA59 SYD → HND May 19, 03:10 UTCMay 19, 13:00 UTC9h 50m
2026-05-18 QFA20 MNL → SYD May 18, 13:20 UTCMay 18, 20:30 UTC7h 9m
2026-05-18 QFA19 SYD → MNL May 18, 02:45 UTCMay 18, 10:50 UTC8h 5m
2026-05-17 QFA60 HND → SYD May 17, 15:31 UTCMay 18, 00:45 UTC9h 15m
2026-05-17 QFA59 SYD → HND May 17, 01:40 UTCMay 17, 11:01 UTC9h 20m
2026-05-16 QFA60 HND → SYD May 16, 13:25 UTCMay 16, 22:40 UTC9h 15m
2026-05-16 QFA59 SYD → HND May 16, 01:40 UTCMay 16, 11:05 UTC9h 26m
2026-05-15 QFA24 BKK → SYD May 15, 12:00 UTCMay 15, 20:40 UTC8h 39m
2026-05-15 QFA23 SYD → BKK May 15, 00:40 UTCMay 15, 10:10 UTC9h 30m
2026-05-14 QFA128 HKG → SYD May 14, 13:05 UTCMay 14, 20:40 UTC7h 35m
2026-05-14 QFA128 HKG → SYD May 14, 12:00 UTCMay 14, 12:20 UTC20m
2026-05-14 QFA127 SYD → HKG May 14, 09:25 UTCMay 14, 09:40 UTC15m
2026-05-14 QFA127 SYD → HKG May 14, 00:40 UTCMay 14, 08:25 UTC7h 45m
2026-05-13 QFA24 BKK → SYD May 13, 11:40 UTCMay 13, 20:30 UTC8h 50m
2026-05-13 QFA23 SYD → BKK May 13, 00:15 UTCMay 13, 09:15 UTC9h 0m
2026-05-12 QFA128 HKG → SYD May 12, 13:00 UTCMay 12, 20:25 UTC7h 25m
2026-05-12 QFA128 HKG → SYD May 12, 11:55 UTCMay 12, 12:10 UTC15m
2026-05-12 QFA127 SYD → HKG May 12, 09:35 UTCMay 12, 09:55 UTC20m
2026-05-12 QFA127 SYD → HKG May 12, 08:05 UTCMay 12, 08:30 UTC25m
2026-05-11 QFA20 MNL → SYD May 11, 13:30 UTCMay 11, 20:40 UTC7h 10m
2026-05-11 QFA19 SYD → MNL May 11, 03:00 UTCMay 11, 11:00 UTC8h 0m
2026-05-10 QFA6003 LAX → SYD May 10, 22:40 UTCMay 10, 23:50 UTC1h 10m
2026-05-10 QFA51 BNE → SIN May 10, 01:34 UTCMay 10, 19:50 UTC18h 15m
2026-05-05 QFA62 NRT → BNE May 5, 13:15 UTCMay 5, 21:30 UTC8h 15m
2026-05-04 QFA79 MEL → HND May 4, 23:55 UTCMay 5, 10:00 UTC10h 5m
2026-05-04 QFA80 NRT → MEL May 4, 12:00 UTCMay 4, 21:30 UTC9h 31m
2026-05-04 QFA61 BNE → HND May 4, 00:50 UTCMay 4, 09:35 UTC8h 45m
2026-05-03 QFA62 NRT → BNE May 3, 13:05 UTCMay 3, 21:24 UTC8h 20m
2026-05-03 QFA79 MEL → HND May 3, 00:05 UTCMay 3, 10:10 UTC10h 4m

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

Mode-S 7C531C frequently asked

What is Mode-S code 7C531C?
7C531C is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-QPA.
Where is Mode-S 7C531C registered?
Mode-S code 7C531C is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C531C broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C531C, octal 37051434, decimal 8,147,740.
What flights does 7C531C operate?
Mode-S 7C531C has broadcast 16 distinct callsigns, including QFA59, QFA60, QFA24, QFA23, QFA127.