Apparatus

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sensors Mode-S transponder

7C79D1

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-YCJ · PACIFIC AEROSPACE CT-4 Airtrainer · operated by PACIFIC FLIGHT SERVICES PTY LTD

Hex
7C79D1
Octal
37074721
Decimal
8,157,649
Country
AU
Tail
VH-YCJ
Type
CT4
No current signal · last broadcast 5h ago
Flights observed
49
Distinct callsigns
8
Country
AU
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 7C79D1.

Country allocation

The ICAO 24-bit address 7C79D1 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 8 distinct

Callsign Airline Flights Last seen
HARR89 - 13 2026-05-26
HARR83 - 12 2026-06-12
HARR81 - 7 2026-05-28
YCJ - 6 2026-05-19
HARR84 - 4 2026-05-05
HARR88 - 3 2026-05-25
HARR85 - 2 2026-06-05
HARR82 - 2 2026-06-02

Recent flights last 49

DateFlightRouteTakeoffLandingDuration
2026-06-12 HARR83 JAD → JAD Jun 12, 04:25 UTCJun 12, 05:40 UTC1h 15m
2026-06-10 HARR83 JAD → JAD Jun 10, 03:00 UTCJun 10, 03:55 UTC55m
2026-06-10 HARR83 JAD → JAD Jun 10, 00:55 UTCJun 10, 02:05 UTC1h 10m
2026-06-09 HARR83 JAD → JAD Jun 9, 05:30 UTCJun 9, 05:50 UTC20m
2026-06-05 HARR85 JAD → JAD Jun 5, 03:40 UTCJun 5, 04:35 UTC55m
2026-06-05 HARR85 JAD → JAD Jun 5, 01:00 UTCJun 5, 02:05 UTC1h 5m
2026-06-04 HARR83 JAD → JAD Jun 4, 03:45 UTCJun 4, 04:50 UTC1h 5m
2026-06-04 HARR83 - Jun 4, 01:35 UTCJun 4, 02:40 UTC1h 5m
2026-06-03 HARR83 - Jun 3, 03:45 UTCJun 3, 04:30 UTC45m
2026-06-03 HARR83 - Jun 3, 01:25 UTCJun 3, 02:10 UTC45m
2026-06-02 HARR82 - Jun 2, 05:25 UTCJun 2, 06:30 UTC1h 5m
2026-05-28 HARR81 JAD → JAD May 28, 01:20 UTCMay 28, 02:20 UTC1h 0m
2026-05-27 HARR81 - May 27, 03:29 UTCMay 27, 04:30 UTC1h 0m
2026-05-27 HARR81 JAD → JAD May 27, 01:09 UTCMay 27, 02:19 UTC1h 10m
2026-05-26 HARR89 JAD → JAD May 26, 03:25 UTCMay 26, 04:35 UTC1h 10m
2026-05-26 HARR83 - May 26, 01:10 UTCMay 26, 02:15 UTC1h 5m
2026-05-25 HARR88 JAD → JAD May 25, 04:50 UTCMay 25, 05:55 UTC1h 5m
2026-05-25 HARR88 JAD → JAD May 25, 02:20 UTCMay 25, 03:10 UTC50m
2026-05-22 HARR89 - May 22, 03:15 UTCMay 22, 03:35 UTC20m
2026-05-22 HARR89 JAD → JAD May 22, 00:55 UTCMay 22, 02:10 UTC1h 15m
2026-05-20 HARR89 JAD → JAD May 20, 03:40 UTCMay 20, 04:50 UTC1h 11m
2026-05-20 HARR88 JAD → JAD May 20, 01:20 UTCMay 20, 02:40 UTC1h 20m
2026-05-19 YCJ JAD → JAD May 19, 07:20 UTCMay 19, 08:20 UTC1h 0m
2026-05-19 YCJ JAD → JAD May 19, 05:45 UTCMay 19, 06:35 UTC50m
2026-05-19 HARR83 - May 19, 03:20 UTCMay 19, 04:40 UTC1h 20m
2026-05-19 HARR83 - May 19, 00:55 UTCMay 19, 02:15 UTC1h 20m
2026-05-18 YCJ JAD → JAD May 18, 07:25 UTCMay 18, 08:45 UTC1h 20m
2026-05-18 YCJ JAD → JAD May 18, 05:45 UTCMay 18, 06:20 UTC35m
2026-05-18 HARR83 JAD → JAD May 18, 01:55 UTCMay 18, 02:10 UTC15m
2026-05-15 YCJ JAD → JAD May 15, 04:30 UTCMay 15, 05:25 UTC55m
2026-05-15 YCJ JAD → JAD May 15, 02:45 UTCMay 15, 03:20 UTC35m
2026-05-14 HARR81 JAD → JAD May 14, 01:40 UTCMay 14, 01:45 UTC5m
2026-05-13 HARR81 JAD → JAD May 13, 02:20 UTCMay 13, 02:25 UTC5m
2026-05-13 HARR81 JAD → JAD May 13, 01:05 UTCMay 13, 01:10 UTC5m
2026-05-08 HARR81 - May 8, 02:19 UTCMay 8, 03:39 UTC1h 20m
2026-05-07 HARR89 - May 7, 05:55 UTCMay 7, 06:55 UTC1h 0m
2026-05-07 HARR89 - May 7, 04:05 UTCMay 7, 04:25 UTC20m
2026-05-07 HARR89 - May 7, 03:15 UTCMay 7, 03:40 UTC25m
2026-05-07 HARR89 JAD → JAD May 7, 01:10 UTCMay 7, 02:15 UTC1h 5m
2026-05-06 HARR89 JAD → JAD May 6, 02:50 UTCMay 6, 03:55 UTC1h 5m
2026-05-06 HARR89 JAD → JAD May 6, 01:01 UTCMay 6, 01:50 UTC50m
2026-05-05 HARR84 JAD → JAD May 5, 05:50 UTCMay 5, 06:45 UTC55m
2026-05-05 HARR84 JAD → JAD May 5, 03:35 UTCMay 5, 04:25 UTC50m
2026-05-05 HARR84 JAD → JAD May 5, 03:15 UTCMay 5, 03:25 UTC10m
2026-05-05 HARR84 JAD → JAD May 5, 01:00 UTCMay 5, 02:15 UTC1h 15m
2026-05-01 HARR89 - May 1, 03:00 UTCMay 1, 03:55 UTC55m
2026-05-01 HARR89 - May 1, 00:55 UTCMay 1, 01:50 UTC55m
2026-04-20 HARR82 - Apr 20, 01:20 UTCApr 20, 02:05 UTC45m
2026-04-16 HARR89 - Apr 16, 01:10 UTCApr 16, 02:04 UTC55m

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

Mode-S 7C79D1 frequently asked

What is Mode-S code 7C79D1?
7C79D1 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-YCJ.
Where is Mode-S 7C79D1 registered?
Mode-S code 7C79D1 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C79D1 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C79D1, octal 37074721, decimal 8,157,649.
What flights does 7C79D1 operate?
Mode-S 7C79D1 has broadcast 8 distinct callsigns, including HARR89, HARR83, HARR81, YCJ, HARR84.