Apparatus

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sensors Mode-S transponder

7C7B81

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-YOJ · CESSNA 172 Skyhawk · operated by SINGAPORE FLYING COLLEGE PTE LTD

Hex
7C7B81
Octal
37075601
Decimal
8,158,081
Country
AU
Tail
VH-YOJ
Type
C172
No current signal · last broadcast Jul 16, 00:35 UTC
Flights observed
200
Distinct callsigns
1
Country
AU
Last broadcast
Jul 16, 00:35 UTC

Last known position

Most recent position reported by Mode-S 7C7B81.

Country allocation

The ICAO 24-bit address 7C7B81 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
YOJ - 200 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 YOJ JAD → JAD Jul 15, 23:40 UTCJul 16, 00:30 UTC50m
2026-07-15 YOJ JAD → JAD Jul 15, 06:25 UTCJul 15, 07:00 UTC35m
2026-07-15 YOJ JAD → JAD Jul 15, 04:45 UTCJul 15, 05:10 UTC25m
2026-07-15 YOJ - Jul 15, 01:55 UTCJul 15, 03:30 UTC1h 35m
2026-07-15 YOJ - Jul 15, 00:45 UTCJul 15, 01:15 UTC30m
2026-07-14 YOJ JAD → JAD Jul 14, 08:20 UTCJul 14, 08:40 UTC20m
2026-07-14 YOJ JAD → JAD Jul 14, 07:25 UTCJul 14, 08:05 UTC40m
2026-07-14 YOJ - Jul 14, 03:55 UTCJul 14, 05:05 UTC1h 10m
2026-07-14 YOJ - Jul 14, 02:30 UTCJul 14, 03:05 UTC35m
2026-07-13 YOJ JAD → JAD Jul 13, 23:50 UTCJul 14, 00:20 UTC30m
2026-07-13 YOJ JAD → JAD Jul 13, 09:05 UTCJul 13, 09:35 UTC30m
2026-07-13 YOJ JAD → JAD Jul 13, 07:10 UTCJul 13, 07:30 UTC20m
2026-07-13 YOJ JAD → JAD Jul 13, 03:30 UTCJul 13, 05:10 UTC1h 40m
2026-07-13 YOJ JAD → JAD Jul 13, 01:30 UTCJul 13, 02:05 UTC35m
2026-07-12 YOJ JAD → JAD Jul 12, 06:30 UTCJul 12, 08:50 UTC2h 20m
2026-07-12 YOJ JAD → JAD Jul 12, 02:35 UTCJul 12, 05:20 UTC2h 45m
2026-07-12 YOJ JAD → JAD Jul 12, 00:25 UTCJul 12, 01:15 UTC50m
2026-07-11 YOJ JAD → JAD Jul 11, 10:30 UTCJul 11, 11:05 UTC35m
2026-07-11 YOJ JAD → JAD Jul 11, 05:15 UTCJul 11, 07:50 UTC2h 35m
2026-07-11 YOJ JAD → JAD Jul 11, 01:10 UTCJul 11, 03:20 UTC2h 10m
2026-07-10 YOJ JAD → JAD Jul 10, 06:40 UTCJul 10, 09:20 UTC2h 40m
2026-07-09 YOJ JAD → JAD Jul 9, 12:15 UTCJul 9, 12:25 UTC10m
2026-07-09 YOJ JAD → JAD Jul 9, 10:25 UTCJul 9, 11:00 UTC35m
2026-07-09 YOJ JAD → JAD Jul 9, 07:35 UTCJul 9, 08:45 UTC1h 10m
2026-07-09 YOJ JAD → JAD Jul 9, 05:30 UTCJul 9, 06:25 UTC55m
2026-07-09 YOJ JAD → JAD Jul 9, 03:05 UTCJul 9, 03:50 UTC45m
2026-07-08 YOJ JAD → JAD Jul 8, 07:00 UTCJul 8, 09:30 UTC2h 30m
2026-07-08 YOJ JAD → JAD Jul 8, 03:35 UTCJul 8, 05:30 UTC1h 55m
2026-07-08 YOJ - Jul 8, 01:30 UTCJul 8, 02:15 UTC45m
2026-07-08 YOJ - Jul 8, 00:05 UTCJul 8, 00:50 UTC45m
2026-07-07 YOJ JAD → JAD Jul 7, 10:15 UTCJul 7, 10:55 UTC40m
2026-07-07 YOJ JAD → JAD Jul 7, 07:05 UTCJul 7, 08:15 UTC1h 10m
2026-07-07 YOJ JAD → JAD Jul 7, 04:55 UTCJul 7, 06:00 UTC1h 5m
2026-07-07 YOJ JAD → JAD Jul 7, 01:05 UTCJul 7, 03:00 UTC1h 55m
2026-07-06 YOJ JAD → JAD Jul 6, 00:30 UTCJul 6, 01:05 UTC35m
2026-07-05 YOJ JAD → JAD Jul 5, 01:45 UTCJul 5, 03:05 UTC1h 20m
2026-07-04 YOJ JAD → JAD Jul 4, 08:20 UTCJul 4, 09:00 UTC40m
2026-07-04 YOJ - Jul 4, 06:35 UTCJul 4, 07:15 UTC40m
2026-07-04 YOJ - Jul 4, 05:00 UTCJul 4, 05:45 UTC45m
2026-07-04 YOJ JAD → JAD Jul 4, 01:00 UTCJul 4, 02:50 UTC1h 50m
2026-07-03 YOJ JAD → JAD Jul 3, 06:30 UTCJul 3, 07:40 UTC1h 10m
2026-07-02 YOJ - Jul 2, 12:00 UTCJul 2, 12:45 UTC45m
2026-07-02 YOJ - Jul 2, 10:40 UTCJul 2, 11:25 UTC45m
2026-07-02 YOJ JAD → JAD Jul 2, 07:35 UTCJul 2, 08:20 UTC45m
2026-07-02 YOJ JAD → JAD Jul 2, 05:20 UTCJul 2, 06:30 UTC1h 10m
2026-07-02 YOJ JAD → JAD Jul 2, 00:45 UTCJul 2, 01:20 UTC35m
2026-07-01 YOJ JAD → JAD Jul 1, 02:30 UTCJul 1, 03:35 UTC1h 5m
2026-06-30 YOJ - Jun 30, 09:40 UTCJun 30, 10:20 UTC40m
2026-06-30 YOJ - Jun 30, 07:25 UTCJun 30, 08:50 UTC1h 25m
2026-06-30 YOJ JAD → JAD Jun 30, 05:10 UTCJun 30, 05:50 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-YOJ page for operator, model, and routing details .

Mode-S 7C7B81 frequently asked

What is Mode-S code 7C7B81?
7C7B81 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-YOJ.
Where is Mode-S 7C7B81 registered?
Mode-S code 7C7B81 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C7B81 broadcasting right now?
No active broadcast right now. Last signal was Jul 16, 00:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C7B81, octal 37075601, decimal 8,158,081.
What flights does 7C7B81 operate?
Mode-S 7C7B81 has broadcast 1 distinct callsign, including YOJ.