Apparatus

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sensors Mode-S transponder

7C66E4

ICAO 24-bit transponder address · allocated to Australia

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

Hex
7C66E4
Octal
37063344
Decimal
8,152,804
Country
AU
Tail
VH-ULY
Type
A321
No current signal · last broadcast 1d ago
Flights observed
108
Distinct callsigns
16
Country
AU
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7C66E4.

Country allocation

The ICAO 24-bit address 7C66E4 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 48 2026-05-28
QFA7524 Qantas 25 2026-05-28
QFA7353 Qantas 6 2026-04-30
QFA7335 Qantas 6 2026-05-04
QFA7332 Qantas 6 2026-04-30
QFA7365 Qantas 3 2026-05-05
QFA7354 Qantas 2 2026-05-06
QFA7350 Qantas 2 2026-05-05
QFA7313 Qantas 2 2026-05-04
QFA7305 Qantas 2 2026-05-05
QFA7398 Qantas 1 2026-04-22
QFA7396 Qantas 1 2026-04-21
QFA7356 Qantas 1 2026-05-04
QFA7344 Qantas 1 2026-05-29
QFA7340 Qantas 1 2026-04-21
QFA7333 Qantas 1 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 QFA7333 BNE → SYD May 29, 10:10 UTCMay 29, 11:20 UTC1h 10m
2026-05-29 QFA7344 MEL → BNE May 29, 07:05 UTCMay 29, 08:20 UTC1h 15m
2026-05-28 QFA7524 AKL → CHC May 28, 19:00 UTCMay 28, 22:05 UTC3h 5m
2026-05-28 QFA7523 SYD → AKL May 28, 16:35 UTCMay 28, 17:55 UTC1h 20m
2026-05-28 QFA7523 SYD → AKL May 28, 12:20 UTCMay 28, 15:00 UTC2h 40m
2026-05-27 QFA7524 AKL → CHC May 27, 23:55 UTCMay 28, 02:50 UTC2h 55m
2026-05-27 QFA7523 SYD → AKL May 27, 21:45 UTCMay 27, 22:55 UTC1h 10m
2026-05-27 QFA7523 SYD → AKL May 27, 11:55 UTCMay 27, 14:30 UTC2h 35m
2026-05-26 QFA7524 AKL → CHC May 26, 18:45 UTCMay 26, 21:49 UTC3h 5m
2026-05-26 QFA7523 SYD → AKL May 26, 16:10 UTCMay 26, 17:25 UTC1h 15m
2026-05-26 QFA7523 SYD → AKL May 26, 12:20 UTCMay 26, 14:40 UTC2h 20m
2026-05-25 QFA7524 AKL → CHC May 25, 18:45 UTCMay 25, 22:05 UTC3h 19m
2026-05-25 QFA7523 SYD → AKL May 25, 16:05 UTCMay 25, 17:10 UTC1h 5m
2026-05-25 QFA7523 SYD → AKL May 25, 11:55 UTCMay 25, 14:20 UTC2h 25m
2026-05-23 QFA7524 AKL → CHC May 23, 23:20 UTCMay 24, 02:15 UTC2h 55m
2026-05-23 QFA7523 SYD → AKL May 23, 21:15 UTCMay 23, 22:25 UTC1h 10m
2026-05-23 QFA7523 SYD → AKL May 23, 15:00 UTCMay 23, 15:20 UTC20m
2026-05-23 QFA7523 SYD → AKL May 23, 12:35 UTCMay 23, 13:10 UTC35m
2026-05-21 QFA7524 AKL → CHC May 21, 18:40 UTCMay 21, 21:35 UTC2h 55m
2026-05-21 QFA7523 SYD → AKL May 21, 16:25 UTCMay 21, 17:25 UTC1h 0m
2026-05-21 QFA7523 SYD → AKL May 21, 12:20 UTCMay 21, 15:00 UTC2h 40m
2026-05-20 QFA7524 AKL → CHC May 20, 18:45 UTCMay 20, 22:05 UTC3h 20m
2026-05-20 QFA7523 SYD → AKL May 20, 16:35 UTCMay 20, 17:45 UTC1h 10m
2026-05-20 QFA7523 SYD → AKL May 20, 12:20 UTCMay 20, 15:05 UTC2h 45m
2026-05-19 QFA7524 AKL → CHC May 19, 18:25 UTCMay 19, 21:35 UTC3h 10m
2026-05-19 QFA7523 SYD → AKL May 19, 16:10 UTCMay 19, 17:15 UTC1h 5m
2026-05-19 QFA7523 SYD → AKL May 19, 12:15 UTCMay 19, 14:50 UTC2h 35m
2026-05-19 QFA7523 SYD → AKL May 19, 09:10 UTCMay 19, 10:15 UTC1h 5m
2026-05-19 QFA7524 AKL → CHC May 19, 01:25 UTCMay 19, 02:35 UTC1h 10m
2026-05-16 QFA7524 AKL → CHC May 16, 17:55 UTCMay 16, 20:40 UTC2h 45m
2026-05-16 QFA7523 SYD → AKL May 16, 15:45 UTCMay 16, 16:55 UTC1h 10m
2026-05-16 QFA7523 SYD → AKL May 16, 11:16 UTCMay 16, 14:05 UTC2h 50m
2026-05-15 QFA7524 AKL → CHC May 15, 17:10 UTCMay 15, 20:10 UTC3h 0m
2026-05-14 QFA7523 SYD → AKL May 14, 16:50 UTCMay 14, 17:55 UTC1h 5m
2026-05-14 QFA7523 SYD → AKL May 14, 12:45 UTCMay 14, 15:35 UTC2h 50m
2026-05-13 QFA7524 AKL → CHC May 13, 18:50 UTCMay 13, 21:40 UTC2h 50m
2026-05-13 QFA7523 SYD → AKL May 13, 16:25 UTCMay 13, 17:30 UTC1h 5m
2026-05-13 QFA7523 SYD → AKL May 13, 12:05 UTCMay 13, 15:00 UTC2h 55m
2026-05-12 QFA7524 AKL → CHC May 12, 20:50 UTCMay 12, 21:45 UTC55m
2026-05-12 QFA7524 AKL → CHC May 12, 18:50 UTCMay 12, 19:05 UTC15m
2026-05-12 QFA7523 SYD → AKL May 12, 16:35 UTCMay 12, 17:40 UTC1h 5m
2026-05-12 QFA7523 SYD → AKL May 12, 12:05 UTCMay 12, 14:55 UTC2h 50m
2026-05-12 QFA7523 SYD → AKL May 12, 08:55 UTCMay 12, 10:05 UTC1h 10m
2026-05-11 QFA7524 AKL → CHC May 11, 19:05 UTCMay 11, 22:10 UTC3h 5m
2026-05-11 QFA7523 SYD → AKL May 11, 16:30 UTCMay 11, 17:50 UTC1h 21m
2026-05-11 QFA7523 SYD → AKL May 11, 14:40 UTCMay 11, 15:00 UTC20m
2026-05-11 QFA7523 SYD → AKL May 11, 12:20 UTCMay 11, 12:50 UTC30m
2026-05-09 QFA7524 AKL → CHC May 9, 18:05 UTCMay 9, 21:00 UTC2h 55m
2026-05-09 QFA7523 SYD → AKL May 9, 16:00 UTCMay 9, 17:15 UTC1h 15m
2026-05-09 QFA7523 SYD → AKL May 9, 11:20 UTCMay 9, 14:10 UTC2h 50m

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

Mode-S 7C66E4 frequently asked

What is Mode-S code 7C66E4?
7C66E4 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ULY.
Where is Mode-S 7C66E4 registered?
Mode-S code 7C66E4 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C66E4 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 7C66E4, octal 37063344, decimal 8,152,804.
What flights does 7C66E4 operate?
Mode-S 7C66E4 has broadcast 16 distinct callsigns, including QFA7523, QFA7524, QFA7353, QFA7335, QFA7332.