Apparatus

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sensors Mode-S transponder

7C671F

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-UNL · PIPER PA-28-140/150/160/180 · operated by ROYAL AERO CLUB OF NSW INCORPORATED

Hex
7C671F
Octal
37063437
Decimal
8,152,863
Country
AU
Tail
VH-UNL
Type
P28A
No current signal · last broadcast 4d ago
Flights observed
66
Distinct callsigns
1
Country
AU
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S 7C671F.

Country allocation

The ICAO 24-bit address 7C671F 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
UNL - 66 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UNL - Jul 26, 04:35 UTCJul 26, 05:10 UTC35m
2026-07-26 UNL - Jul 26, 03:15 UTCJul 26, 03:40 UTC25m
2026-07-24 UNL CDU → CDU Jul 24, 01:15 UTCJul 24, 01:50 UTC35m
2026-07-14 UNL - Jul 14, 04:45 UTCJul 14, 06:40 UTC1h 55m
2026-07-11 UNL CDU → CDU Jul 11, 21:30 UTCJul 11, 22:10 UTC40m
2026-07-11 UNL CDU → CDU Jul 11, 06:40 UTCJul 11, 07:15 UTC35m
2026-07-11 UNL CDU → CDU Jul 11, 03:50 UTCJul 11, 04:35 UTC45m
2026-07-11 UNL CDU → CDU Jul 11, 01:55 UTCJul 11, 02:20 UTC25m
2026-07-10 UNL - Jul 10, 23:45 UTCJul 11, 00:35 UTC50m
2026-07-10 UNL CDU → CDU Jul 10, 06:15 UTCJul 10, 06:55 UTC40m
2026-07-10 UNL - Jul 10, 04:10 UTCJul 10, 04:50 UTC40m
2026-07-10 UNL CDU → CDU Jul 10, 01:50 UTCJul 10, 02:40 UTC50m
2026-07-10 UNL - Jul 10, 00:10 UTCJul 10, 00:55 UTC45m
2026-07-09 UNL CDU → CDU Jul 9, 21:50 UTCJul 9, 22:25 UTC35m
2026-07-09 UNL - Jul 9, 05:20 UTCJul 9, 06:10 UTC50m
2026-07-09 UNL - Jul 9, 03:10 UTCJul 9, 03:55 UTC45m
2026-07-09 UNL CDU → CDU Jul 9, 00:00 UTCJul 9, 01:00 UTC1h 0m
2026-07-08 UNL CDU → CDU Jul 8, 21:50 UTCJul 8, 22:30 UTC40m
2026-07-08 UNL CDU → CDU Jul 8, 05:50 UTCJul 8, 06:40 UTC50m
2026-07-08 UNL - Jul 8, 03:05 UTCJul 8, 04:05 UTC1h 0m
2026-07-08 UNL - Jul 8, 01:55 UTCJul 8, 02:30 UTC35m
2026-07-07 UNL CDU → CDU Jul 7, 21:35 UTCJul 7, 22:25 UTC50m
2026-07-07 UNL CDU → CDU Jul 7, 05:45 UTCJul 7, 06:15 UTC30m
2026-07-07 UNL - Jul 7, 04:05 UTCJul 7, 04:55 UTC50m
2026-07-05 UNL CDU → CDU Jul 5, 03:45 UTCJul 5, 04:05 UTC20m
2026-07-05 UNL CDU → CDU Jul 5, 01:15 UTCJul 5, 02:35 UTC1h 20m
2026-07-04 UNL - Jul 4, 04:45 UTCJul 4, 05:10 UTC25m
2026-07-03 UNL CDU → CDU Jul 3, 01:05 UTCJul 3, 01:50 UTC45m
2026-06-29 UNL - Jun 29, 05:45 UTCJun 29, 05:59 UTC15m
2026-06-28 UNL - Jun 28, 03:14 UTCJun 28, 03:50 UTC35m
2026-06-27 UNL - Jun 27, 05:04 UTCJun 27, 05:44 UTC40m
2026-06-24 UNL - Jun 24, 06:20 UTCJun 24, 07:20 UTC1h 0m
2026-06-24 UNL - Jun 24, 03:29 UTCJun 24, 04:34 UTC1h 5m
2026-06-21 UNL CDU → CDU Jun 21, 03:34 UTCJun 21, 04:04 UTC30m
2026-06-21 UNL CDU → CDU Jun 21, 01:30 UTCJun 21, 02:24 UTC55m
2026-06-17 UNL - Jun 17, 05:25 UTCJun 17, 06:30 UTC1h 5m
2026-06-16 UNL - Jun 16, 23:55 UTCJun 17, 01:10 UTC1h 15m
2026-06-14 UNL - Jun 14, 05:45 UTCJun 14, 06:10 UTC25m
2026-06-14 UNL - Jun 14, 04:40 UTCJun 14, 05:05 UTC25m
2026-06-13 UNL - Jun 13, 05:10 UTCJun 13, 05:40 UTC30m
2026-06-13 UNL - Jun 13, 03:00 UTCJun 13, 03:40 UTC40m
2026-06-12 UNL - Jun 12, 05:00 UTCJun 12, 06:15 UTC1h 15m
2026-06-08 UNL - Jun 8, 06:20 UTCJun 8, 07:05 UTC45m
2026-06-08 UNL - Jun 8, 05:05 UTCJun 8, 05:30 UTC25m
2026-06-08 UNL CDU → CDU Jun 8, 03:55 UTCJun 8, 04:20 UTC25m
2026-06-08 UNL - Jun 8, 02:00 UTCJun 8, 03:10 UTC1h 10m
2026-06-08 UNL - Jun 8, 00:05 UTCJun 8, 00:50 UTC45m
2026-06-07 UNL - Jun 7, 04:00 UTCJun 7, 04:20 UTC20m
2026-06-07 UNL CDU → CDU Jun 7, 02:00 UTCJun 7, 02:19 UTC20m
2026-06-07 UNL - Jun 7, 00:49 UTCJun 7, 01:24 UTC35m

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

Mode-S 7C671F frequently asked

What is Mode-S code 7C671F?
7C671F is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-UNL.
Where is Mode-S 7C671F registered?
Mode-S code 7C671F is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C671F broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C671F, octal 37063437, decimal 8,152,863.
What flights does 7C671F operate?
Mode-S 7C671F has broadcast 1 distinct callsign, including UNL.