Apparatus

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sensors Mode-S transponder

7C66D5

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-ULJ · LEARJET 60

Hex
7C66D5
Octal
37063325
Decimal
8,152,789
Country
AU
Tail
VH-ULJ
Type
LJ60
No current signal · last broadcast 2d ago
Flights observed
60
Distinct callsigns
2
Country
AU
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 7C66D5.

Country allocation

The ICAO 24-bit address 7C66D5 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 2 distinct

Callsign Airline Flights Last seen
VHULJ - 59 2026-07-11
ULJ - 1 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 VHULJ - Jul 11, 04:45 UTCJul 11, 08:10 UTC3h 25m
2026-07-10 VHULJ - Jul 10, 15:25 UTCJul 10, 15:45 UTC20m
2026-07-10 VHULJ - Jul 10, 11:50 UTCJul 10, 14:40 UTC2h 50m
2026-07-09 VHULJ - Jul 9, 08:10 UTCJul 9, 10:20 UTC2h 10m
2026-07-09 VHULJ - Jul 9, 03:30 UTCJul 9, 07:15 UTC3h 45m
2026-07-04 VHULJ - Jul 4, 03:40 UTCJul 4, 03:55 UTC15m
2026-07-04 VHULJ - Jul 4, 01:40 UTCJul 4, 02:25 UTC45m
2026-07-02 VHULJ - Jul 2, 22:45 UTCJul 3, 01:30 UTC2h 45m
2026-07-01 VHULJ - Jul 1, 23:05 UTCJul 1, 23:50 UTC45m
2026-06-25 VHULJ - Jun 25, 23:55 UTCJun 26, 07:50 UTC7h 55m
2026-06-24 VHULJ - Jun 24, 22:39 UTCJun 25, 08:50 UTC10h 10m
2026-06-24 VHULJ - Jun 24, 04:15 UTCJun 24, 06:10 UTC1h 55m
2026-06-20 VHULJ - Jun 20, 04:04 UTCJun 20, 09:19 UTC5h 15m
2026-06-19 VHULJ - Jun 19, 09:55 UTCJun 20, 09:14 UTC23h 20m
2026-06-19 VHULJ - Jun 19, 05:19 UTCJun 20, 05:09 UTC23h 50m
2026-06-17 VHULJ - Jun 17, 06:00 UTCJun 17, 08:30 UTC2h 30m
2026-06-17 VHULJ - Jun 17, 01:15 UTCJun 17, 03:35 UTC2h 20m
2026-06-13 VHULJ - Jun 13, 07:25 UTCJun 13, 08:10 UTC45m
2026-06-13 VHULJ - Jun 13, 02:25 UTCJun 13, 03:30 UTC1h 5m
2026-06-13 VHULJ - Jun 13, 01:40 UTCJun 13, 01:50 UTC10m
2026-06-12 VHULJ - Jun 12, 14:10 UTCJun 12, 14:20 UTC10m
2026-06-12 VHULJ - Jun 12, 11:50 UTCJun 12, 12:25 UTC35m
2026-06-12 VHULJ HKG → DAC Jun 12, 07:35 UTCJun 12, 11:10 UTC3h 35m
2026-06-12 VHULJ - Jun 12, 04:35 UTCJun 12, 04:55 UTC20m
2026-06-12 VHULJ - Jun 12, 01:25 UTCJun 12, 01:50 UTC25m
2026-06-10 VHULJ - Jun 10, 05:25 UTCJun 10, 05:55 UTC30m
2026-06-10 VHULJ - Jun 10, 02:20 UTCJun 10, 02:50 UTC30m
2026-06-08 VHULJ - Jun 8, 11:40 UTCJun 8, 12:30 UTC50m
2026-06-08 VHULJ - Jun 8, 07:55 UTCJun 8, 08:15 UTC20m
2026-06-08 VHULJ - Jun 8, 03:15 UTCJun 8, 03:55 UTC40m
2026-06-07 VHULJ - Jun 7, 11:05 UTCJun 7, 11:25 UTC20m
2026-06-07 VHULJ - Jun 7, 03:40 UTCJun 7, 04:05 UTC25m
2026-06-07 VHULJ - Jun 7, 00:25 UTCJun 7, 00:49 UTC25m
2026-05-28 VHULJ - May 28, 05:25 UTCMay 28, 06:45 UTC1h 20m
2026-05-28 VHULJ - May 28, 04:15 UTCMay 28, 04:45 UTC30m
2026-05-28 VHULJ - May 28, 01:40 UTCMay 28, 02:10 UTC30m
2026-05-27 VHULJ - May 27, 23:40 UTCMay 28, 01:00 UTC1h 20m
2026-05-26 VHULJ - May 26, 04:50 UTCMay 26, 13:15 UTC8h 25m
2026-05-01 VHULJ - May 1, 04:20 UTCMay 1, 13:10 UTC8h 50m
2026-04-30 ULJ - Apr 30, 06:30 UTCApr 30, 13:25 UTC6h 55m
2026-04-30 VHULJ - Apr 30, 04:55 UTCApr 30, 05:15 UTC20m
2026-04-30 VHULJ - Apr 30, 03:15 UTCApr 30, 04:25 UTC1h 10m
2026-04-29 VHULJ - Apr 29, 11:45 UTCApr 29, 12:10 UTC25m
2026-04-25 VHULJ - Apr 25, 04:50 UTCApr 25, 05:20 UTC30m
2026-04-24 VHULJ - Apr 24, 02:05 UTCApr 24, 14:25 UTC12h 20m
2026-04-23 VHULJ - Apr 23, 07:40 UTCApr 23, 11:45 UTC4h 5m
2026-04-23 VHULJ - Apr 23, 05:45 UTCApr 23, 06:01 UTC15m
2026-04-23 VHULJ - Apr 23, 00:30 UTCApr 23, 01:00 UTC30m
2026-04-19 VHULJ - Apr 19, 08:45 UTCApr 19, 12:35 UTC3h 50m
2026-04-16 VHULJ - Apr 16, 15:15 UTCApr 16, 15:25 UTC10m

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

Mode-S 7C66D5 frequently asked

What is Mode-S code 7C66D5?
7C66D5 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ULJ.
Where is Mode-S 7C66D5 registered?
Mode-S code 7C66D5 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C66D5 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C66D5, octal 37063325, decimal 8,152,789.
What flights does 7C66D5 operate?
Mode-S 7C66D5 has broadcast 2 distinct callsigns, including VHULJ, ULJ.