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 11h ago
Flights observed
84
Distinct callsigns
1
Country
AU
Last broadcast
11h ago

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 - 84 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 YOJ JAD → JAD Jun 2, 08:40 UTCJun 2, 09:15 UTC35m
2026-06-02 YOJ JAD → JAD Jun 2, 05:30 UTCJun 2, 06:00 UTC30m
2026-05-29 YOJ JAD → JAD May 29, 04:40 UTCMay 29, 06:35 UTC1h 55m
2026-05-29 YOJ JAD → JAD May 29, 00:15 UTCMay 29, 02:05 UTC1h 50m
2026-05-28 YOJ JAD → JAD May 28, 06:50 UTCMay 28, 08:20 UTC1h 30m
2026-05-27 YOJ JAD → JAD May 27, 07:50 UTCMay 27, 08:25 UTC35m
2026-05-27 YOJ JAD → JAD May 27, 01:44 UTCMay 27, 02:59 UTC1h 15m
2026-05-26 YOJ JAD → JAD May 26, 23:49 UTCMay 27, 00:25 UTC35m
2026-05-26 YOJ JAD → JAD May 26, 04:00 UTCMay 26, 06:20 UTC2h 20m
2026-05-26 YOJ JAD → JAD May 26, 01:30 UTCMay 26, 02:44 UTC1h 15m
2026-05-24 YOJ JAD → JAD May 24, 03:10 UTCMay 24, 05:50 UTC2h 40m
2026-05-23 YOJ JAD → JAD May 23, 05:45 UTCMay 23, 06:30 UTC45m
2026-05-23 YOJ JAD → JAD May 23, 03:05 UTCMay 23, 04:15 UTC1h 10m
2026-05-22 YOJ JAD → JAD May 22, 06:45 UTCMay 22, 09:25 UTC2h 40m
2026-05-22 YOJ JAD → JAD May 22, 02:50 UTCMay 22, 05:00 UTC2h 10m
2026-05-21 YOJ JAD → JAD May 21, 08:05 UTCMay 21, 09:10 UTC1h 5m
2026-05-20 YOJ JAD → JAD May 20, 05:25 UTCMay 20, 06:45 UTC1h 20m
2026-05-20 YOJ JAD → JAD May 20, 02:40 UTCMay 20, 03:50 UTC1h 10m
2026-05-19 YOJ - May 19, 11:00 UTCMay 19, 11:40 UTC40m
2026-05-19 YOJ - May 19, 09:30 UTCMay 19, 10:30 UTC1h 0m
2026-05-19 YOJ JAD → JAD May 19, 07:20 UTCMay 19, 07:50 UTC30m
2026-05-19 YOJ JAD → JAD May 19, 04:20 UTCMay 19, 05:55 UTC1h 35m
2026-05-18 YOJ JAD → JAD May 18, 23:55 UTCMay 19, 02:20 UTC2h 25m
2026-05-17 YOJ JAD → JAD May 17, 07:35 UTCMay 17, 09:05 UTC1h 30m
2026-05-17 YOJ JAD → JAD May 17, 03:40 UTCMay 17, 04:20 UTC40m
2026-05-16 YOJ - May 16, 02:55 UTCMay 16, 03:25 UTC30m
2026-05-16 YOJ - May 16, 00:30 UTCMay 16, 01:05 UTC35m
2026-05-15 YOJ JAD → JAD May 15, 07:25 UTCMay 15, 08:00 UTC35m
2026-05-15 YOJ JAD → JAD May 15, 05:10 UTCMay 15, 05:45 UTC35m
2026-05-13 YOJ JAD → JAD May 13, 08:35 UTCMay 13, 09:25 UTC50m
2026-05-13 YOJ JAD → JAD May 13, 04:10 UTCMay 13, 06:15 UTC2h 5m
2026-05-13 YOJ JAD → JAD May 13, 01:20 UTCMay 13, 02:35 UTC1h 15m
2026-05-12 YOJ JAD → JAD May 12, 08:45 UTCMay 12, 09:25 UTC40m
2026-05-12 YOJ BUY → JAD May 12, 03:30 UTCMay 12, 05:05 UTC1h 35m
2026-05-11 YOJ JAD → JAD May 11, 01:45 UTCMay 11, 02:15 UTC30m
2026-05-09 YOJ JAD → JAD May 9, 04:15 UTCMay 9, 04:30 UTC15m
2026-05-09 YOJ JAD → JAD May 9, 03:45 UTCMay 9, 04:00 UTC15m
2026-05-08 YOJ JAD → JAD May 8, 10:44 UTCMay 8, 11:30 UTC45m
2026-05-08 YOJ JAD → JAD May 8, 08:24 UTCMay 8, 09:04 UTC40m
2026-05-08 YOJ JAD → JAD May 8, 05:44 UTCMay 8, 06:59 UTC1h 15m
2026-05-08 YOJ JAD → JAD May 8, 02:04 UTCMay 8, 03:04 UTC1h 0m
2026-05-07 YOJ JAD → JAD May 7, 07:45 UTCMay 7, 08:15 UTC30m
2026-05-07 YOJ JAD → JAD May 7, 05:45 UTCMay 7, 06:20 UTC35m
2026-05-07 YOJ JAD → JAD May 7, 00:25 UTCMay 7, 00:55 UTC30m
2026-05-06 YOJ JAD → JAD May 6, 05:20 UTCMay 6, 06:55 UTC1h 35m
2026-05-06 YOJ - May 6, 02:45 UTCMay 6, 03:10 UTC25m
2026-05-06 YOJ JAD → JAD May 6, 02:01 UTCMay 6, 02:30 UTC30m
2026-05-05 YOJ JAD → JAD May 5, 23:45 UTCMay 6, 00:25 UTC40m
2026-05-05 YOJ JAD → JAD May 5, 07:35 UTCMay 5, 08:05 UTC30m
2026-05-05 YOJ JAD → JAD May 5, 02:45 UTCMay 5, 03:10 UTC25m

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 11h ago.
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.