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
Broadcasting now · callsign QFA7305 · 30,025 ft
Flights observed
170
Distinct callsigns
19
Country
AU
Last broadcast
48m ago

Current position

7C66E4 is currently broadcasting. Map zoomed to live position.

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 19 distinct

Callsign Airline Flights Last seen
QFA7523 Qantas 63 2026-06-08
QFA7524 Qantas 32 2026-06-08
QFA7305 - 14 2026-07-14
QFA7350 - 13 2026-07-14
QFA7365 - 7 2026-07-13
QFA7353 - 7 2026-07-06
QFA7335 - 7 2026-07-07
QFA7332 - 7 2026-07-06
QFA7356 - 5 2026-06-22
QFA7354 - 3 2026-07-09
QFA7340 Qantas 3 2026-07-09
QFA7313 Qantas 2 2026-05-04
QFA7398 Qantas 1 2026-04-22
QFA7396 Qantas 1 2026-04-21
QFA7370 - 1 2026-07-13
QFA7344 Qantas 1 2026-05-29
QFA7333 Qantas 1 2026-05-29
QFA7331 - 1 2026-06-11
QFA7307 - 1 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 QFA7305 - Jul 14, 16:05 UTCJul 14, 17:00 UTC55m
2026-07-14 QFA7350 MEL → BNE Jul 14, 13:05 UTCJul 14, 14:55 UTC1h 50m
2026-07-13 QFA7305 BNE → MEL Jul 13, 16:50 UTCJul 13, 18:55 UTC2h 5m
2026-07-13 QFA7350 MEL → BNE Jul 13, 13:30 UTCJul 13, 15:25 UTC1h 55m
2026-07-13 QFA7365 - Jul 13, 11:20 UTCJul 13, 12:05 UTC45m
2026-07-13 QFA7370 - Jul 13, 08:05 UTCJul 13, 08:40 UTC35m
2026-07-09 QFA7305 BNE → MEL Jul 9, 16:05 UTCJul 9, 18:00 UTC1h 55m
2026-07-09 QFA7340 SYD → BNE Jul 9, 12:55 UTCJul 9, 14:10 UTC1h 15m
2026-07-09 QFA7354 MEL → SYD Jul 9, 10:25 UTCJul 9, 11:35 UTC1h 10m
2026-07-08 QFA7305 BNE → MEL Jul 8, 17:00 UTCJul 8, 19:05 UTC2h 5m
2026-07-08 QFA7350 MEL → BNE Jul 8, 14:05 UTCJul 8, 15:55 UTC1h 50m
2026-07-07 QFA7335 BNE → MEL Jul 7, 13:35 UTCJul 7, 15:35 UTC2h 0m
2026-07-06 QFA7332 BNE → BNE Jul 6, 19:35 UTCJul 7, 11:25 UTC15h 50m
2026-07-06 QFA7353 MEL → BNE Jul 6, 16:35 UTCJul 6, 18:25 UTC1h 50m
2026-06-30 QFA7305 BNE → MEL Jun 30, 16:55 UTCJun 30, 19:00 UTC2h 5m
2026-06-30 QFA7350 MEL → BNE Jun 30, 13:35 UTCJun 30, 15:20 UTC1h 45m
2026-06-25 QFA7305 BNE → MEL Jun 25, 17:20 UTCJun 25, 19:15 UTC1h 55m
2026-06-25 QFA7350 MEL → BNE Jun 25, 13:24 UTCJun 25, 15:20 UTC1h 55m
2026-06-24 QFA7305 BNE → MEL Jun 24, 16:34 UTCJun 24, 18:39 UTC2h 5m
2026-06-24 QFA7350 MEL → BNE Jun 24, 13:24 UTCJun 24, 15:14 UTC1h 50m
2026-06-23 QFA7305 BNE → MEL Jun 23, 16:44 UTCJun 23, 18:50 UTC2h 5m
2026-06-23 QFA7350 MEL → BNE Jun 23, 13:29 UTCJun 23, 15:19 UTC1h 50m
2026-06-23 QFA7365 - Jun 23, 11:40 UTCJun 23, 12:15 UTC35m
2026-06-22 QFA7356 - Jun 22, 22:49 UTCJun 22, 23:20 UTC30m
2026-06-22 QFA7305 BNE → MEL Jun 22, 16:54 UTCJun 22, 19:09 UTC2h 15m
2026-06-22 QFA7350 MEL → BNE Jun 22, 13:49 UTCJun 22, 15:35 UTC1h 45m
2026-06-22 QFA7365 - Jun 22, 11:50 UTCJun 22, 12:25 UTC35m
2026-06-18 QFA7356 - Jun 18, 16:55 UTCJun 18, 17:21 UTC26m
2026-06-17 QFA7305 BNE → MEL Jun 17, 17:30 UTCJun 17, 19:35 UTC2h 5m
2026-06-17 QFA7350 MEL → BNE Jun 17, 13:50 UTCJun 17, 15:40 UTC1h 50m
2026-06-16 QFA7356 MEL → LST Jun 16, 18:20 UTCJun 17, 11:55 UTC17h 36m
2026-06-15 QFA7305 BNE → MEL Jun 15, 17:04 UTCJun 15, 19:20 UTC2h 15m
2026-06-15 QFA7350 MEL → BNE Jun 15, 13:50 UTCJun 15, 15:40 UTC1h 50m
2026-06-15 QFA7307 MEL → MEL Jun 15, 07:50 UTCJun 15, 12:19 UTC4h 30m
2026-06-11 QFA7331 BNE → MEL Jun 11, 20:45 UTCJun 11, 22:50 UTC2h 5m
2026-06-11 QFA7350 MEL → BNE Jun 11, 13:10 UTCJun 11, 15:00 UTC1h 50m
2026-06-11 QFA7365 LST → MEL Jun 11, 11:15 UTCJun 11, 11:50 UTC35m
2026-06-10 QFA7356 MEL → LST Jun 10, 16:50 UTCJun 10, 17:25 UTC35m
2026-06-09 QFA7305 BNE → MEL Jun 9, 16:45 UTCJun 9, 18:25 UTC1h 40m
2026-06-09 QFA7340 SYD → BNE Jun 9, 12:55 UTCJun 9, 14:05 UTC1h 10m
2026-06-08 QFA7524 AKL → CHC Jun 8, 18:35 UTCJun 8, 21:35 UTC3h 0m
2026-06-08 QFA7523 SYD → AKL Jun 8, 16:20 UTCJun 8, 17:40 UTC1h 20m
2026-06-08 QFA7523 SYD → AKL Jun 8, 12:00 UTCJun 8, 14:45 UTC2h 45m
2026-06-06 QFA7524 AKL → CHC Jun 6, 17:54 UTCJun 6, 20:45 UTC2h 50m
2026-06-06 QFA7523 SYD → AKL Jun 6, 15:59 UTCJun 6, 17:05 UTC1h 5m
2026-06-06 QFA7523 SYD → AKL Jun 6, 11:19 UTCJun 6, 14:00 UTC2h 40m
2026-06-04 QFA7524 AKL → CHC Jun 4, 18:40 UTCJun 4, 21:50 UTC3h 10m
2026-06-04 QFA7523 SYD → AKL Jun 4, 16:40 UTCJun 4, 17:50 UTC1h 10m
2026-06-04 QFA7523 SYD → AKL Jun 4, 12:05 UTCJun 4, 14:40 UTC2h 35m
2026-06-03 QFA7524 AKL → CHC Jun 3, 18:30 UTCJun 3, 21:45 UTC3h 15m

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?
Yes. Mode-S 7C66E4 is currently airborne.
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 19 distinct callsigns, including QFA7523, QFA7524, QFA7305, QFA7350, QFA7365.