Apparatus

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sensors Mode-S transponder

7C7A90

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-YHU · CESSNA 172 Skyhawk · operated by AIRFLITE PTY LTD

Hex
7C7A90
Octal
37075220
Decimal
8,157,840
Country
AU
Tail
VH-YHU
Type
C172
Transponder active on ground
Flights observed
91
Distinct callsigns
1
Country
AU
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S 7C7A90.

Country allocation

The ICAO 24-bit address 7C7A90 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
YHU - 91 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 YHU JAD → JAD May 29, 07:05 UTCMay 29, 07:35 UTC30m
2026-05-29 YHU JAD → JAD May 29, 01:10 UTCMay 29, 01:50 UTC40m
2026-05-28 YHU JAD → JAD May 28, 10:00 UTCMay 28, 10:15 UTC15m
2026-05-28 YHU JAD → JAD May 28, 00:25 UTCMay 28, 01:15 UTC50m
2026-05-27 YHU - May 27, 08:45 UTCMay 27, 09:15 UTC30m
2026-05-27 YHU - May 27, 05:45 UTCMay 27, 06:04 UTC20m
2026-05-27 YHU JAD → JAD May 27, 03:04 UTCMay 27, 03:54 UTC50m
2026-05-27 YHU JAD → JAD May 27, 00:25 UTCMay 27, 00:59 UTC35m
2026-05-26 YHU JAD → JAD May 26, 07:40 UTCMay 26, 08:54 UTC1h 15m
2026-05-26 YHU JAD → JAD May 26, 03:30 UTCMay 26, 04:15 UTC45m
2026-05-21 YHU JAD → JAD May 21, 05:10 UTCMay 21, 05:15 UTC5m
2026-05-21 YHU - May 21, 00:35 UTCMay 21, 01:15 UTC40m
2026-05-20 YHU JAD → JAD May 20, 23:35 UTCMay 21, 00:15 UTC40m
2026-05-20 YHU - May 20, 04:25 UTCMay 20, 05:30 UTC1h 6m
2026-05-20 YHU JAD → JAD May 20, 02:30 UTCMay 20, 03:35 UTC1h 5m
2026-05-20 YHU JAD → JAD May 20, 00:00 UTCMay 20, 00:20 UTC20m
2026-05-19 YHU JAD → JAD May 19, 10:20 UTCMay 19, 11:55 UTC1h 35m
2026-05-19 YHU JAD → JAD May 19, 08:25 UTCMay 19, 09:05 UTC40m
2026-05-19 YHU JAD → JAD May 19, 06:10 UTCMay 19, 07:25 UTC1h 15m
2026-05-19 YHU - May 19, 03:55 UTCMay 19, 04:25 UTC30m
2026-05-19 YHU - May 19, 02:30 UTCMay 19, 02:55 UTC25m
2026-05-19 YHU JAD → JAD May 19, 00:25 UTCMay 19, 01:30 UTC1h 5m
2026-05-18 YHU - May 18, 10:35 UTCMay 18, 11:20 UTC45m
2026-05-18 YHU JAD → JAD May 18, 10:05 UTCMay 18, 10:25 UTC20m
2026-05-18 YHU JAD → JAD May 18, 03:40 UTCMay 18, 04:30 UTC50m
2026-05-15 YHU JAD → JAD May 15, 08:20 UTCMay 15, 08:55 UTC35m
2026-05-15 YHU JAD → JAD May 15, 06:35 UTCMay 15, 07:15 UTC40m
2026-05-13 YHU JAD → JAD May 13, 05:20 UTCMay 13, 07:20 UTC2h 0m
2026-05-13 YHU JAD → JAD May 13, 01:45 UTCMay 13, 02:45 UTC1h 0m
2026-05-12 YHU - May 12, 23:50 UTCMay 13, 00:30 UTC40m
2026-05-12 YHU - May 12, 07:30 UTCMay 12, 08:05 UTC35m
2026-05-12 YHU - May 12, 02:45 UTCMay 12, 04:40 UTC1h 55m
2026-05-11 YHU JAD → JAD May 11, 09:45 UTCMay 11, 11:35 UTC1h 50m
2026-05-11 YHU - May 11, 07:40 UTCMay 11, 08:50 UTC1h 10m
2026-05-11 YHU - May 11, 06:40 UTCMay 11, 07:10 UTC30m
2026-05-11 YHU - May 11, 03:05 UTCMay 11, 04:15 UTC1h 10m
2026-05-11 YHU - May 11, 01:40 UTCMay 11, 02:10 UTC30m
2026-05-10 YHU - May 10, 05:25 UTCMay 10, 05:34 UTC10m
2026-05-10 YHU JAD → RTS May 10, 01:45 UTCMay 10, 02:10 UTC25m
2026-05-08 YHU JAD → JAD May 8, 11:09 UTCMay 8, 11:49 UTC40m
2026-05-08 YHU JAD → JAD May 8, 09:54 UTCMay 8, 10:39 UTC45m
2026-05-08 YHU JAD → JAD May 8, 06:04 UTCMay 8, 06:45 UTC40m
2026-05-08 YHU JAD → JAD May 8, 05:29 UTCMay 8, 05:49 UTC20m
2026-05-07 YHU JAD → JAD May 7, 23:55 UTCMay 8, 01:04 UTC1h 10m
2026-05-07 YHU JAD → JAD May 7, 10:00 UTCMay 7, 11:25 UTC1h 25m
2026-05-07 YHU JAD → JAD May 7, 07:05 UTCMay 7, 08:15 UTC1h 10m
2026-05-07 YHU - May 7, 03:30 UTCMay 7, 04:10 UTC40m
2026-05-07 YHU JAD → JAD May 7, 02:15 UTCMay 7, 02:55 UTC40m
2026-05-06 YHU JAD → JAD May 6, 23:45 UTCMay 7, 00:45 UTC1h 0m
2026-05-06 YHU JAD → JAD May 6, 08:25 UTCMay 6, 09:30 UTC1h 5m

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

Mode-S 7C7A90 frequently asked

What is Mode-S code 7C7A90?
7C7A90 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-YHU.
Where is Mode-S 7C7A90 registered?
Mode-S code 7C7A90 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C7A90 broadcasting right now?
Mode-S 7C7A90 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C7A90, octal 37075220, decimal 8,157,840.
What flights does 7C7A90 operate?
Mode-S 7C7A90 has broadcast 1 distinct callsign, including YHU.