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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 6h ago
Flights observed
195
Distinct callsigns
20
Country
AU
Last broadcast
6h 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 20 distinct

Callsign Airline Flights Last seen
QFA59 - 20 2026-06-22
QFA60 Qantas 18 2026-06-22
QFA127 - 17 2026-07-08
QFA24 Qantas 16 2026-07-06
QFA23 - 16 2026-07-06
QFA30 Qantas 15 2026-07-08
QFA128 Qantas 14 2026-07-03
QFA29 - 13 2026-07-03
QFA26 - 7 2026-06-25
QFA25 Qantas 7 2026-06-25
QFA20 Qantas 7 2026-06-28
QFA19 - 7 2026-06-28
QFA62 - 6 2026-07-13
QFA79 - 5 2026-07-09
QFA61 - 5 2026-07-14
QFA51 - 4 2026-07-12
QFA80 Qantas 3 2026-05-04
QFA044 - 3 2026-06-30
QFA36 - 2 2026-07-02
QFA98 - 1 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 QFA61 - Jul 14, 01:05 UTCJul 14, 02:35 UTC1h 30m
2026-07-13 QFA62 NRT → BNE Jul 13, 12:50 UTCJul 13, 21:05 UTC8h 15m
2026-07-13 QFA61 - Jul 13, 00:45 UTCJul 13, 09:35 UTC8h 50m
2026-07-12 QFA52 - Jul 12, 13:01 UTCJul 12, 19:45 UTC6h 45m
2026-07-12 QFA51 - Jul 12, 09:45 UTCJul 12, 10:10 UTC25m
2026-07-12 QFA51 - Jul 12, 02:05 UTCJul 12, 03:35 UTC1h 30m
2026-07-09 QFA62 NRT → BNE Jul 9, 13:00 UTCJul 9, 21:15 UTC8h 15m
2026-07-09 QFA79 MEL → NRT Jul 9, 00:10 UTCJul 9, 10:15 UTC10h 5m
2026-07-08 QFA30 - Jul 8, 14:25 UTCJul 8, 21:25 UTC7h 0m
2026-07-08 QFA30 HKG → MEL Jul 8, 13:15 UTCJul 8, 13:30 UTC15m
2026-07-08 QFA127 - Jul 8, 10:55 UTCJul 8, 11:05 UTC10m
2026-07-08 QFA127 - Jul 8, 09:20 UTCJul 8, 09:55 UTC35m
2026-07-08 QFA127 - Jul 8, 01:50 UTCJul 8, 02:45 UTC55m
2026-07-06 QFA24 BKK → SYD Jul 6, 12:00 UTCJul 6, 20:35 UTC8h 35m
2026-07-06 QFA23 SYD → BKK Jul 6, 01:05 UTCJul 6, 10:10 UTC9h 5m
2026-07-05 QFA24 BKK → SYD Jul 5, 11:40 UTCJul 5, 20:35 UTC8h 55m
2026-07-05 QFA23 SYD → BKK Jul 5, 00:30 UTCJul 5, 09:40 UTC9h 10m
2026-07-04 QFA24 BKK → SYD Jul 4, 12:05 UTCJul 4, 20:55 UTC8h 50m
2026-07-04 QFA23 - Jul 4, 00:40 UTCJul 4, 10:05 UTC9h 25m
2026-07-03 QFA128 HKG → SYD Jul 3, 13:00 UTCJul 3, 21:35 UTC8h 35m
2026-07-03 QFA29 - Jul 3, 09:25 UTCJul 3, 09:55 UTC30m
2026-07-03 QFA29 - Jul 3, 00:50 UTCJul 3, 08:35 UTC7h 45m
2026-07-02 QFA36 - Jul 2, 17:50 UTCJul 2, 19:00 UTC1h 10m
2026-07-02 QFA36 - Jul 2, 12:30 UTCJul 2, 12:40 UTC10m
2026-07-02 QFA51 - Jul 2, 01:35 UTCJul 2, 05:25 UTC3h 50m
2026-07-01 QFA6014 - Jul 1, 21:20 UTCJul 1, 22:30 UTC1h 10m
2026-06-30 QFA044 SYD → SYD Jun 30, 06:40 UTCJun 30, 20:20 UTC13h 40m
2026-06-30 QFA517 BNE → SYD Jun 30, 01:35 UTCJun 30, 02:45 UTC1h 10m
2026-06-29 QFA98 - Jun 29, 15:09 UTCJun 29, 21:50 UTC6h 40m
2026-06-29 QFA97 - Jun 29, 05:09 UTCJun 29, 12:49 UTC7h 40m
2026-06-29 QFA516 SYD → BNE Jun 29, 00:49 UTCJun 29, 02:00 UTC1h 10m
2026-06-28 QFA20 MNL → SYD Jun 28, 13:25 UTCJun 28, 20:39 UTC7h 15m
2026-06-28 QFA19 SYD → MNL Jun 28, 03:19 UTCJun 28, 11:19 UTC8h 0m
2026-06-27 QFA044 SYD → SYD Jun 27, 06:54 UTCJun 27, 20:19 UTC13h 25m
2026-06-25 QFA26 HND → SYD Jun 25, 23:05 UTCJun 26, 08:10 UTC9h 5m
2026-06-25 QFA25 SYD → HND Jun 25, 11:50 UTCJun 25, 21:20 UTC9h 30m
2026-06-24 QFA042 - Jun 24, 13:54 UTCJun 24, 20:14 UTC6h 20m
2026-06-24 QFA041 SYD → CGK Jun 24, 04:39 UTCJun 24, 11:54 UTC7h 15m
2026-06-23 QFA20 MNL → SYD Jun 23, 13:15 UTCJun 23, 20:34 UTC7h 20m
2026-06-23 QFA19 SYD → MNL Jun 23, 03:09 UTCJun 23, 11:04 UTC7h 55m
2026-06-22 QFA60 HND → SYD Jun 22, 13:29 UTCJun 22, 22:40 UTC9h 10m
2026-06-22 QFA59 SYD → HND Jun 22, 01:35 UTCJun 22, 11:04 UTC9h 30m
2026-06-21 QFA60 HND → SYD Jun 21, 13:50 UTCJun 21, 22:34 UTC8h 45m
2026-06-21 QFA59 SYD → HND Jun 21, 01:59 UTCJun 21, 11:55 UTC9h 55m
2026-06-20 QFA60 HND → SYD Jun 20, 13:24 UTCJun 20, 22:25 UTC9h 0m
2026-06-20 QFA59 SYD → HND Jun 20, 01:50 UTCJun 20, 11:44 UTC9h 55m
2026-06-19 QFA26 - Jun 19, 00:59 UTCJun 19, 09:49 UTC8h 50m
2026-06-18 QFA25 SYD → HND Jun 18, 13:15 UTCJun 18, 22:45 UTC9h 30m
2026-06-17 QFA26 - Jun 17, 22:10 UTCJun 18, 07:10 UTC9h 0m
2026-06-17 QFA25 SYD → HND Jun 17, 10:50 UTCJun 17, 20:10 UTC9h 20m

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 6h 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 20 distinct callsigns, including QFA59, QFA60, QFA127, QFA24, QFA23.