Apparatus

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sensors Mode-S transponder

7C01A9

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-AL3 · CESSNA F406 Caravan 2

Hex
7C01A9
Octal
37000651
Decimal
8,126,889
Country
AU
Tail
VH-AL3
Type
F406
No current signal · last broadcast 4d ago
Flights observed
45
Distinct callsigns
1
Country
AU
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S 7C01A9.

Country allocation

The ICAO 24-bit address 7C01A9 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 1 distinct

Callsign Airline Flights Last seen
AL3 - 45 2026-07-13

Recent flights last 45

DateFlightRouteTakeoffLandingDuration
2026-07-13 AL3 - Jul 13, 02:25 UTCJul 13, 05:10 UTC2h 45m
2026-07-11 AL3 - Jul 11, 01:00 UTCJul 11, 02:20 UTC1h 20m
2026-07-10 AL3 - Jul 10, 22:40 UTCJul 10, 23:05 UTC25m
2026-07-07 AL3 ADL → ADL Jul 7, 01:00 UTCJul 7, 03:30 UTC2h 30m
2026-07-04 AL3 - Jul 4, 06:10 UTCJul 4, 06:35 UTC25m
2026-07-04 AL3 - Jul 4, 01:55 UTCJul 4, 04:10 UTC2h 15m
2026-07-03 AL3 BWU → BWU Jul 3, 07:50 UTCJul 3, 08:10 UTC20m
2026-07-01 AL3 MEB → BWU Jul 1, 01:45 UTCJul 1, 03:35 UTC1h 50m
2026-06-27 AL3 - Jun 27, 02:59 UTCJun 27, 04:15 UTC1h 15m
2026-06-27 AL3 - Jun 27, 00:44 UTCJun 27, 02:55 UTC2h 10m
2026-06-27 AL3 ABX → ABX Jun 27, 00:29 UTCJun 27, 00:34 UTC5m
2026-06-26 AL3 BWU → ABX Jun 26, 00:15 UTCJun 26, 02:05 UTC1h 50m
2026-06-24 AL3 BWU → BWU Jun 24, 02:15 UTCJun 24, 04:24 UTC2h 10m
2026-06-20 AL3 BWU → BWU Jun 20, 07:39 UTCJun 20, 07:49 UTC10m
2026-06-20 AL3 - Jun 20, 07:24 UTCJun 20, 07:34 UTC10m
2026-06-19 AL3 - Jun 19, 23:59 UTCJun 20, 02:00 UTC2h 0m
2026-06-16 AL3 - Jun 16, 01:10 UTCJun 16, 04:35 UTC3h 25m
2026-06-13 AL3 BWU → BWU Jun 13, 01:50 UTCJun 13, 04:20 UTC2h 30m
2026-06-12 AL3 - Jun 12, 04:00 UTCJun 12, 05:55 UTC1h 55m
2026-06-06 AL3 - Jun 6, 23:19 UTCJun 7, 01:15 UTC1h 55m
2026-06-04 AL3 - Jun 4, 02:50 UTCJun 4, 05:00 UTC2h 10m
2026-06-03 AL3 - Jun 3, 01:50 UTCJun 3, 03:35 UTC1h 45m
2026-06-01 AL3 - Jun 1, 01:45 UTCJun 1, 05:05 UTC3h 20m
2026-05-30 AL3 - May 30, 02:20 UTCMay 30, 05:05 UTC2h 45m
2026-05-19 AL3 - May 19, 23:15 UTCMay 20, 03:20 UTC4h 5m
2026-05-09 AL3 - May 9, 03:10 UTCMay 9, 03:35 UTC25m
2026-04-28 AL3 - Apr 28, 07:50 UTCApr 28, 08:25 UTC35m
2026-04-28 AL3 - Apr 28, 06:45 UTCApr 28, 07:15 UTC30m
2026-04-20 AL3 - Apr 20, 04:20 UTCApr 20, 05:15 UTC55m
2026-04-20 AL3 - Apr 20, 03:20 UTCApr 20, 03:50 UTC30m
2026-04-18 AL3 - Apr 18, 22:20 UTCApr 19, 00:45 UTC2h 25m
2026-04-18 AL3 - Apr 18, 04:45 UTCApr 18, 05:20 UTC35m
2026-04-18 AL3 - Apr 18, 03:25 UTCApr 18, 05:20 UTC1h 55m
2026-04-18 AL3 - Apr 18, 02:45 UTCApr 18, 03:20 UTC35m
2026-04-17 AL3 - Apr 17, 23:25 UTCApr 18, 01:10 UTC1h 45m
2026-04-17 AL3 - Apr 17, 22:20 UTCApr 17, 23:20 UTC1h 0m
2026-04-17 AL3 - Apr 17, 03:20 UTCApr 17, 03:40 UTC20m
2026-04-17 AL3 - Apr 17, 01:20 UTCApr 17, 03:15 UTC1h 55m
2026-04-16 AL3 - Apr 16, 23:55 UTCApr 17, 01:15 UTC1h 20m
2026-04-15 AL3 - Apr 15, 23:10 UTCApr 16, 00:40 UTC1h 30m
2026-04-15 AL3 - Apr 15, 21:20 UTCApr 15, 23:00 UTC1h 40m
2026-04-15 AL3 - Apr 15, 05:00 UTCApr 15, 05:50 UTC50m
2026-04-15 AL3 - Apr 15, 02:55 UTCApr 15, 04:50 UTC1h 55m
2026-04-15 AL3 - Apr 15, 01:55 UTCApr 15, 02:50 UTC55m
2026-04-14 AL3 - Apr 14, 05:15 UTCApr 14, 05:55 UTC40m

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-AL3 page for operator, model, and routing details .

Mode-S 7C01A9 frequently asked

What is Mode-S code 7C01A9?
7C01A9 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-AL3.
Where is Mode-S 7C01A9 registered?
Mode-S code 7C01A9 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C01A9 broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C01A9, octal 37000651, decimal 8,126,889.
What flights does 7C01A9 operate?
Mode-S 7C01A9 has broadcast 1 distinct callsign, including AL3.