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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 Jul 26, 06:30 UTC
Flights observed
105
Distinct callsigns
1
Country
AU
Last broadcast
Jul 26, 06:30 UTC

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 - 105 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UNN BWU → BWU Jul 26, 03:45 UTCJul 26, 06:25 UTC2h 40m
2026-07-26 UNN BWU → BWU Jul 26, 00:05 UTCJul 26, 02:05 UTC2h 0m
2026-07-25 UNN - Jul 25, 04:25 UTCJul 25, 05:00 UTC35m
2026-07-24 UNN - Jul 24, 23:25 UTCJul 25, 00:05 UTC40m
2026-07-24 UNN BWU → BWU Jul 24, 03:10 UTCJul 24, 04:45 UTC1h 35m
2026-07-24 UNN - Jul 24, 01:00 UTCJul 24, 01:35 UTC35m
2026-07-23 UNN - Jul 23, 23:30 UTCJul 24, 00:10 UTC40m
2026-07-23 UNN - Jul 23, 01:50 UTCJul 23, 03:00 UTC1h 10m
2026-07-23 UNN - Jul 23, 00:15 UTCJul 23, 01:05 UTC50m
2026-07-22 UNN BWU → CES Jul 22, 04:50 UTCJul 22, 05:25 UTC35m
2026-07-21 UNN BWU → BWU Jul 21, 22:45 UTCJul 21, 23:55 UTC1h 10m
2026-07-21 UNN - Jul 21, 01:55 UTCJul 21, 02:50 UTC55m
2026-07-21 UNN - Jul 21, 00:40 UTCJul 21, 01:20 UTC40m
2026-07-15 UNN - Jul 15, 03:00 UTCJul 15, 04:25 UTC1h 25m
2026-07-15 UNN - Jul 15, 00:10 UTCJul 15, 01:30 UTC1h 20m
2026-07-14 UNN BWU → BWU Jul 14, 00:25 UTCJul 14, 03:20 UTC2h 55m
2026-07-13 UNN BWU → BWU Jul 13, 00:35 UTCJul 13, 01:45 UTC1h 10m
2026-07-12 UNN BWU → BWU Jul 12, 01:25 UTCJul 12, 04:15 UTC2h 50m
2026-07-11 UNN BWU → BWU Jul 11, 04:10 UTCJul 11, 05:20 UTC1h 10m
2026-07-10 UNN BWU → BWU Jul 10, 23:40 UTCJul 11, 01:30 UTC1h 50m
2026-07-09 UNN - Jul 9, 03:10 UTCJul 9, 04:10 UTC1h 0m
2026-07-09 UNN BWU → BWU Jul 9, 02:30 UTCJul 9, 02:55 UTC25m
2026-07-09 UNN BWU → BWU Jul 9, 00:20 UTCJul 9, 00:55 UTC35m
2026-07-04 UNN BWU → BWU Jul 4, 03:35 UTCJul 4, 05:15 UTC1h 40m
2026-07-04 UNN BWU → BWU Jul 4, 00:40 UTCJul 4, 02:30 UTC1h 50m
2026-07-03 UNN BWU → BWU Jul 3, 08:45 UTCJul 3, 09:40 UTC55m
2026-07-03 UNN BWU → BWU Jul 3, 07:30 UTCJul 3, 08:15 UTC45m
2026-07-03 UNN BWU → BWU Jul 3, 03:40 UTCJul 3, 04:45 UTC1h 5m
2026-07-02 UNN - Jul 2, 01:15 UTCJul 2, 02:25 UTC1h 10m
2026-07-01 UNN - Jul 1, 23:25 UTCJul 2, 00:25 UTC1h 0m
2026-07-01 UNN - Jul 1, 04:40 UTCJul 1, 04:50 UTC10m
2026-07-01 UNN BWU → BWU Jul 1, 03:30 UTCJul 1, 04:30 UTC1h 0m
2026-06-22 UNN - Jun 22, 04:49 UTCJun 22, 05:24 UTC35m
2026-06-22 UNN - Jun 22, 01:44 UTCJun 22, 02:34 UTC50m
2026-06-21 UNN BWU → BWU Jun 21, 23:24 UTCJun 22, 00:24 UTC1h 0m
2026-06-19 UNN BWU → BWU Jun 19, 03:15 UTCJun 19, 05:24 UTC2h 10m
2026-06-18 UNN BWU → BWU Jun 18, 23:05 UTCJun 19, 00:20 UTC1h 14m
2026-06-17 UNN - Jun 17, 05:50 UTCJun 17, 06:50 UTC1h 0m
2026-06-17 UNN - Jun 17, 04:20 UTCJun 17, 05:00 UTC40m
2026-06-17 UNN BWU → BWU Jun 17, 00:10 UTCJun 17, 02:10 UTC2h 0m
2026-06-16 UNN BWU → BWU Jun 16, 04:25 UTCJun 16, 06:20 UTC1h 55m
2026-06-16 UNN - Jun 16, 01:40 UTCJun 16, 03:00 UTC1h 20m
2026-06-16 UNN - Jun 16, 00:24 UTCJun 16, 01:00 UTC35m
2026-06-13 UNN BWU → BWU Jun 13, 02:55 UTCJun 13, 05:20 UTC2h 25m
2026-06-12 UNN BWU → BWU Jun 12, 02:35 UTCJun 12, 03:00 UTC25m
2026-06-11 UNN BWU → BWU Jun 11, 03:20 UTCJun 11, 04:40 UTC1h 20m
2026-06-11 UNN - Jun 11, 00:35 UTCJun 11, 01:05 UTC30m
2026-06-10 UNN - Jun 10, 23:30 UTCJun 11, 00:00 UTC30m
2026-06-10 UNN BWU → BWU Jun 10, 06:10 UTCJun 10, 06:40 UTC30m
2026-06-10 UNN BWU → BWU Jun 10, 05:30 UTCJun 10, 06:00 UTC30m

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 Jul 26, 06:30 UTC.
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.