Apparatus

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sensors Mode-S transponder

7C6721

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-UNN · CESSNA 152 · operated by UNIVERSITY OF NEW SOUTH WALES

Hex
7C6721
Octal
37063441
Decimal
8,152,865
Country
AU
Tail
VH-UNN
Type
C152
No current signal · last broadcast 4h ago
Flights observed
47
Distinct callsigns
1
Country
AU
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 7C6721.

Country allocation

The ICAO 24-bit address 7C6721 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
UNN - 47 2026-05-30

Recent flights last 47

DateFlightRouteTakeoffLandingDuration
2026-05-30 UNN BWU → BWU May 30, 03:55 UTCMay 30, 06:00 UTC2h 5m
2026-05-30 UNN - May 30, 01:45 UTCMay 30, 02:30 UTC45m
2026-05-29 UNN - May 29, 23:55 UTCMay 30, 01:00 UTC1h 5m
2026-05-29 UNN BWU → BWU May 29, 04:45 UTCMay 29, 06:55 UTC2h 10m
2026-05-28 UNN BWU → BWU May 28, 02:25 UTCMay 28, 03:00 UTC35m
2026-05-27 UNN BWU → BWU May 27, 03:04 UTCMay 27, 04:04 UTC1h 0m
2026-05-22 UNN BWU → BWU May 22, 03:20 UTCMay 22, 03:55 UTC35m
2026-05-21 UNN BWU → BWU May 21, 08:00 UTCMay 21, 08:15 UTC15m
2026-05-21 UNN BWU → BWU May 21, 04:25 UTCMay 21, 06:40 UTC2h 15m
2026-05-20 UNN BWU → BWU May 20, 23:55 UTCMay 21, 01:55 UTC2h 0m
2026-05-19 UNN BWU → BWU May 19, 00:50 UTCMay 19, 02:30 UTC1h 40m
2026-05-15 UNN - May 15, 04:35 UTCMay 15, 05:05 UTC30m
2026-05-14 UNN - May 14, 21:10 UTCMay 14, 21:35 UTC25m
2026-05-09 UNN - May 9, 03:35 UTCMay 9, 04:10 UTC35m
2026-05-09 UNN - May 9, 02:10 UTCMay 9, 02:55 UTC45m
2026-05-08 UNN BWU → BWU May 8, 23:35 UTCMay 9, 00:10 UTC35m
2026-05-08 UNN - May 8, 04:39 UTCMay 8, 06:54 UTC2h 15m
2026-05-08 UNN - May 8, 01:40 UTCMay 8, 02:04 UTC25m
2026-05-08 UNN - May 8, 00:20 UTCMay 8, 01:09 UTC50m
2026-05-05 UNN - May 5, 04:45 UTCMay 5, 05:30 UTC45m
2026-05-05 UNN - May 5, 03:25 UTCMay 5, 04:15 UTC50m
2026-05-03 UNN BWU → BWU May 3, 04:45 UTCMay 3, 06:00 UTC1h 15m
2026-05-03 UNN BWU → BWU May 3, 02:20 UTCMay 3, 03:25 UTC1h 5m
2026-05-02 UNN BWU → BWU May 2, 00:15 UTCMay 2, 01:00 UTC45m
2026-05-01 UNN BWU → BWU May 1, 05:10 UTCMay 1, 05:50 UTC40m
2026-05-01 UNN BWU → BWU May 1, 03:25 UTCMay 1, 04:20 UTC55m
2026-04-30 UNN BWU → BWU Apr 30, 23:30 UTCMay 1, 00:30 UTC1h 0m
2026-04-30 UNN BWU → BWU Apr 30, 03:30 UTCApr 30, 04:40 UTC1h 10m
2026-04-28 UNN BWU → BWU Apr 28, 22:40 UTCApr 28, 23:14 UTC35m
2026-04-28 UNN BWU → BWU Apr 28, 00:50 UTCApr 28, 03:05 UTC2h 15m
2026-04-23 UNN BWU → BWU Apr 23, 04:10 UTCApr 23, 05:10 UTC1h 0m
2026-04-20 UNN BWU → BWU Apr 20, 04:40 UTCApr 20, 05:35 UTC55m
2026-04-20 UNN BWU → BWU Apr 20, 01:35 UTCApr 20, 01:55 UTC20m
2026-04-19 UNN BWU → BWU Apr 19, 22:40 UTCApr 19, 23:50 UTC1h 10m
2026-04-18 UNN - Apr 18, 07:25 UTCApr 18, 07:30 UTC5m
2026-04-18 UNN - Apr 18, 06:35 UTCApr 18, 07:20 UTC45m
2026-04-17 UNN - Apr 17, 04:10 UTCApr 17, 04:55 UTC46m
2026-04-17 UNN BWU → BWU Apr 17, 01:40 UTCApr 17, 02:40 UTC1h 0m
2026-04-16 UNN - Apr 16, 23:20 UTCApr 17, 00:30 UTC1h 10m
2026-04-16 UNN WSI → BWU Apr 16, 03:09 UTCApr 16, 03:49 UTC40m
2026-04-16 UNN - Apr 16, 02:45 UTCApr 16, 03:04 UTC20m
2026-04-15 UNN - Apr 15, 04:20 UTCApr 15, 04:50 UTC30m
2026-04-15 UNN BWU → BWU Apr 15, 00:20 UTCApr 15, 00:50 UTC30m
2026-04-14 UNN WSI → BWU Apr 14, 05:15 UTCApr 14, 06:15 UTC1h 0m
2026-04-13 UNN - Apr 13, 23:15 UTCApr 13, 23:40 UTC25m
2026-04-13 UNN - Apr 13, 04:20 UTCApr 13, 05:20 UTC1h 0m
2026-04-13 UNN - Apr 13, 04:05 UTCApr 13, 04:15 UTC10m

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

Mode-S 7C6721 frequently asked

What is Mode-S code 7C6721?
7C6721 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-UNN.
Where is Mode-S 7C6721 registered?
Mode-S code 7C6721 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C6721 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C6721, octal 37063441, decimal 8,152,865.
What flights does 7C6721 operate?
Mode-S 7C6721 has broadcast 1 distinct callsign, including UNN.