Apparatus

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sensors Mode-S transponder

7C66CF

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-ULD · AIRBUS A-321 · operated by EXPRESS FREIGHTERS AUSTRALIA PTY LIMITED

Hex
7C66CF
Octal
37063317
Decimal
8,152,783
Country
AU
Tail
VH-ULD
Type
A321
No current signal · last broadcast 1d ago
Flights observed
65
Distinct callsigns
20
Country
AU
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7C66CF.

Country allocation

The ICAO 24-bit address 7C66CF 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
QFA7523 - 10 2026-07-16
QFA7354 - 8 2026-07-15
QFA7524 - 5 2026-07-16
QFA7396 - 5 2026-07-08
QFA7340 Qantas 5 2026-07-08
QFA7398 Qantas 4 2026-07-09
QFA7350 - 4 2026-07-07
QFA7305 - 4 2026-07-07
QFA7335 - 3 2026-07-13
QFA7365 - 2 2026-07-14
QFA7356 - 2 2026-07-13
QFA7353 - 2 2026-07-09
QFA7332 - 2 2026-07-09
QFA7303 Qantas 2 2026-07-17
QFA7529 Qantas 1 2026-05-31
QFA7390 - 1 2026-06-29
QFA7330 Qantas 1 2026-06-29
QFA7313 - 1 2026-07-13
QFA7304 Qantas 1 2026-06-23
QFA7302 - 1 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 QFA7303 MEL → BNE Jul 17, 00:25 UTCJul 17, 00:45 UTC20m
2026-07-16 QFA7524 - Jul 16, 16:55 UTCJul 16, 20:05 UTC3h 10m
2026-07-16 QFA7523 SYD → AKL Jul 16, 12:25 UTCJul 16, 15:30 UTC3h 5m
2026-07-15 QFA7524 CHC → SYD Jul 15, 19:45 UTCJul 15, 22:40 UTC2h 55m
2026-07-15 QFA7523 - Jul 15, 17:35 UTCJul 15, 18:40 UTC1h 5m
2026-07-15 QFA7523 SYD → AKL Jul 15, 13:05 UTCJul 15, 15:55 UTC2h 50m
2026-07-15 QFA7354 MEL → SYD Jul 15, 10:30 UTCJul 15, 11:40 UTC1h 10m
2026-07-14 QFA7365 - Jul 14, 11:15 UTCJul 14, 11:50 UTC35m
2026-07-13 QFA7356 - Jul 13, 17:15 UTCJul 13, 17:45 UTC30m
2026-07-13 QFA7335 - Jul 13, 12:35 UTCJul 13, 14:40 UTC2h 5m
2026-07-13 QFA7313 - Jul 13, 09:40 UTCJul 13, 10:50 UTC1h 10m
2026-07-09 QFA7332 - Jul 9, 18:55 UTCJul 9, 20:30 UTC1h 35m
2026-07-09 QFA7353 MEL → BNE Jul 9, 15:55 UTCJul 9, 17:45 UTC1h 50m
2026-07-09 QFA7398 PER → MEL Jul 9, 11:20 UTCJul 9, 14:30 UTC3h 10m
2026-07-08 QFA7396 - Jul 8, 17:00 UTCJul 8, 20:20 UTC3h 20m
2026-07-08 QFA7396 - Jul 8, 15:05 UTCJul 8, 16:00 UTC55m
2026-07-08 QFA7340 SYD → BNE Jul 8, 12:35 UTCJul 8, 13:45 UTC1h 10m
2026-07-08 QFA7354 MEL → SYD Jul 8, 10:25 UTCJul 8, 11:25 UTC1h 0m
2026-07-07 QFA7305 BNE → MEL Jul 7, 16:35 UTCJul 7, 18:45 UTC2h 10m
2026-07-07 QFA7350 MEL → BNE Jul 7, 13:35 UTCJul 7, 15:20 UTC1h 45m
2026-07-07 QFA7365 - Jul 7, 11:30 UTCJul 7, 12:15 UTC45m
2026-07-06 QFA7356 - Jul 6, 16:55 UTCJul 6, 17:25 UTC30m
2026-07-06 QFA7335 BNE → MEL Jul 6, 13:10 UTCJul 6, 15:05 UTC1h 55m
2026-07-06 QFA7303 SYD → BNE Jul 6, 03:25 UTCJul 6, 11:55 UTC8h 30m
2026-07-04 QFA7524 - Jul 4, 17:30 UTCJul 4, 20:35 UTC3h 5m
2026-07-04 QFA7523 SYD → AKL Jul 4, 15:15 UTCJul 4, 16:20 UTC1h 5m
2026-07-04 QFA7523 SYD → AKL Jul 4, 11:25 UTCJul 4, 13:55 UTC2h 30m
2026-07-02 QFA7524 - Jul 2, 16:50 UTCJul 2, 20:20 UTC3h 30m
2026-07-02 QFA7523 SYD → AKL Jul 2, 12:35 UTCJul 2, 15:05 UTC2h 30m
2026-07-01 QFA7524 - Jul 1, 19:35 UTCJul 1, 22:45 UTC3h 10m
2026-07-01 QFA7523 SYD → AKL Jul 1, 17:20 UTCJul 1, 18:30 UTC1h 10m
2026-07-01 QFA7523 SYD → AKL Jul 1, 13:15 UTCJul 1, 15:50 UTC2h 35m
2026-07-01 QFA7354 MEL → SYD Jul 1, 10:20 UTCJul 1, 11:25 UTC1h 5m
2026-06-30 QFA7398 PER → MEL Jun 30, 11:25 UTCJun 30, 14:35 UTC3h 10m
2026-06-29 QFA7390 MEL → PER Jun 29, 18:34 UTCJun 29, 22:30 UTC3h 55m
2026-06-29 QFA7330 BNE → MEL Jun 29, 15:30 UTCJun 29, 17:24 UTC1h 55m
2026-06-29 QFA7340 SYD → BNE Jun 29, 13:00 UTCJun 29, 14:14 UTC1h 15m
2026-06-29 QFA7354 MEL → SYD Jun 29, 10:20 UTCJun 29, 11:25 UTC1h 5m
2026-06-25 QFA7398 PER → MEL Jun 25, 11:25 UTCJun 25, 14:50 UTC3h 25m
2026-06-24 QFA7396 BNE → PER Jun 24, 15:24 UTCJun 24, 20:35 UTC5h 10m
2026-06-24 QFA7340 SYD → BNE Jun 24, 12:40 UTCJun 24, 13:54 UTC1h 15m
2026-06-24 QFA7354 MEL → SYD Jun 24, 10:25 UTCJun 24, 11:29 UTC1h 5m
2026-06-23 QFA7304 MEL → SYD Jun 23, 10:15 UTCJun 23, 13:45 UTC3h 30m
2026-06-18 QFA7396 BNE → PER Jun 18, 15:40 UTCJun 18, 20:50 UTC5h 10m
2026-06-18 QFA7340 SYD → BNE Jun 18, 13:10 UTCJun 18, 14:30 UTC1h 20m
2026-06-18 QFA7354 MEL → SYD Jun 18, 10:20 UTCJun 18, 11:25 UTC1h 5m
2026-06-17 QFA7335 BNE → MEL Jun 17, 12:25 UTCJun 17, 14:30 UTC2h 5m
2026-06-16 QFA7332 BNE → TSV Jun 16, 19:25 UTCJun 17, 11:20 UTC15h 56m
2026-06-16 QFA7353 MEL → BNE Jun 16, 16:25 UTCJun 16, 18:15 UTC1h 50m
2026-06-16 QFA7398 PER → MEL Jun 16, 12:10 UTCJun 16, 15:20 UTC3h 10m

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

Mode-S 7C66CF frequently asked

What is Mode-S code 7C66CF?
7C66CF is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ULD.
Where is Mode-S 7C66CF registered?
Mode-S code 7C66CF is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C66CF 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 7C66CF, octal 37063317, decimal 8,152,783.
What flights does 7C66CF operate?
Mode-S 7C66CF has broadcast 20 distinct callsigns, including QFA7523, QFA7354, QFA7524, QFA7396, QFA7340.