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sensors Mode-S transponder

7C7F51

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-ZFN · PIPER PA-28-140/150/160/180 · operated by SCHOFIELDS FLYING CLUB LTD

Hex
7C7F51
Octal
37077521
Decimal
8,159,057
Country
AU
Tail
VH-ZFN
Type
P28A
No current signal · last broadcast Jul 26, 06:40 UTC
Flights observed
215
Distinct callsigns
1
Country
AU
Last broadcast
Jul 26, 06:40 UTC

Last known position

Most recent position reported by Mode-S 7C7F51.

Country allocation

The ICAO 24-bit address 7C7F51 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
ZFN - 215 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ZFN - Jul 26, 05:35 UTCJul 26, 06:35 UTC1h 1m
2026-07-26 ZFN - Jul 26, 03:50 UTCJul 26, 05:05 UTC1h 15m
2026-07-26 ZFN - Jul 26, 02:45 UTCJul 26, 03:15 UTC30m
2026-07-26 ZFN - Jul 26, 01:15 UTCJul 26, 02:10 UTC55m
2026-07-25 ZFN BWU → BWU Jul 25, 23:15 UTCJul 25, 23:45 UTC30m
2026-07-25 ZFN BWU → BWU Jul 25, 06:00 UTCJul 25, 06:50 UTC50m
2026-07-25 ZFN BWU → BWU Jul 25, 02:05 UTCJul 25, 02:55 UTC50m
2026-07-24 ZFN BWU → BWU Jul 24, 23:20 UTCJul 25, 00:00 UTC40m
2026-07-24 ZFN - Jul 24, 09:30 UTCJul 24, 10:35 UTC1h 5m
2026-07-24 ZFN - Jul 24, 07:10 UTCJul 24, 08:45 UTC1h 35m
2026-07-24 ZFN BWU → BWU Jul 24, 03:20 UTCJul 24, 05:30 UTC2h 10m
2026-07-23 ZFN - Jul 23, 23:50 UTCJul 24, 00:50 UTC1h 0m
2026-07-23 ZFN - Jul 23, 22:25 UTCJul 23, 23:10 UTC45m
2026-07-23 ZFN - Jul 23, 12:15 UTCJul 23, 13:35 UTC1h 20m
2026-07-23 ZFN - Jul 23, 08:35 UTCJul 23, 08:50 UTC15m
2026-07-23 ZFN - Jul 23, 07:10 UTCJul 23, 08:05 UTC55m
2026-07-23 ZFN BWU → BWU Jul 23, 03:50 UTCJul 23, 04:25 UTC35m
2026-07-22 ZFN - Jul 22, 04:30 UTCJul 22, 05:10 UTC40m
2026-07-22 ZFN BWU → BWU Jul 22, 00:50 UTCJul 22, 01:25 UTC35m
2026-07-21 ZFN BWU → BWU Jul 21, 23:30 UTCJul 22, 00:20 UTC50m
2026-07-21 ZFN - Jul 21, 04:40 UTCJul 21, 05:35 UTC55m
2026-07-21 ZFN BWU → BWU Jul 21, 03:45 UTCJul 21, 04:20 UTC35m
2026-07-20 ZFN BWU → BWU Jul 20, 23:50 UTCJul 21, 00:50 UTC1h 0m
2026-07-20 ZFN BWU → BWU Jul 20, 04:15 UTCJul 20, 06:10 UTC1h 55m
2026-07-19 ZFN BWU → BWU Jul 19, 23:40 UTCJul 20, 01:35 UTC1h 55m
2026-07-19 ZFN BWU → BWU Jul 19, 05:50 UTCJul 19, 06:30 UTC40m
2026-07-19 ZFN BWU → BWU Jul 19, 01:15 UTCJul 19, 02:05 UTC50m
2026-07-18 ZFN WOL → BWU Jul 18, 00:04 UTCJul 18, 02:00 UTC1h 55m
2026-07-17 ZFN - Jul 17, 23:05 UTCJul 17, 23:30 UTC25m
2026-07-16 ZFN BWU → BWU Jul 16, 03:15 UTCJul 16, 04:05 UTC50m
2026-07-16 ZFN BWU → BWU Jul 16, 01:05 UTCJul 16, 01:55 UTC50m
2026-07-15 ZFN BWU → BWU Jul 15, 23:10 UTCJul 15, 23:50 UTC40m
2026-07-15 ZFN BWU → BWU Jul 15, 06:00 UTCJul 15, 06:50 UTC50m
2026-07-14 ZFN BWU → BWU Jul 14, 03:25 UTCJul 14, 05:20 UTC1h 55m
2026-07-13 ZFN - Jul 13, 23:20 UTCJul 13, 23:55 UTC35m
2026-07-13 ZFN BWU → BWU Jul 13, 22:25 UTCJul 13, 23:00 UTC35m
2026-07-13 ZFN BWU → BWU Jul 13, 01:50 UTCJul 13, 02:50 UTC1h 0m
2026-07-11 ZFN BWU → BWU Jul 11, 22:15 UTCJul 11, 23:30 UTC1h 15m
2026-07-11 ZFN BWU → BWU Jul 11, 04:55 UTCJul 11, 06:10 UTC1h 15m
2026-07-11 ZFN BWU → BWU Jul 11, 02:45 UTCJul 11, 03:25 UTC40m
2026-07-11 ZFN BWU → BWU Jul 11, 01:00 UTCJul 11, 01:50 UTC50m
2026-07-09 ZFN BWU → BWU Jul 9, 23:30 UTCJul 10, 00:55 UTC1h 25m
2026-07-09 ZFN - Jul 9, 05:15 UTCJul 9, 06:05 UTC50m
2026-07-09 ZFN BWU → BWU Jul 9, 03:45 UTCJul 9, 04:35 UTC50m
2026-07-09 ZFN BWU → BWU Jul 9, 01:35 UTCJul 9, 02:05 UTC30m
2026-07-07 ZFN BWU → BWU Jul 7, 00:00 UTCJul 7, 00:35 UTC35m
2026-07-05 ZFN - Jul 5, 05:05 UTCJul 5, 05:55 UTC50m
2026-07-05 ZFN - Jul 5, 02:55 UTCJul 5, 03:50 UTC55m
2026-07-04 ZFN - Jul 4, 06:00 UTCJul 4, 06:30 UTC30m
2026-07-04 ZFN - Jul 4, 04:10 UTCJul 4, 04:50 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-ZFN page for operator, model, and routing details .

Mode-S 7C7F51 frequently asked

What is Mode-S code 7C7F51?
7C7F51 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ZFN.
Where is Mode-S 7C7F51 registered?
Mode-S code 7C7F51 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C7F51 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 06:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C7F51, octal 37077521, decimal 8,159,057.
What flights does 7C7F51 operate?
Mode-S 7C7F51 has broadcast 1 distinct callsign, including ZFN.