Apparatus

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sensors Mode-S transponder

7C4439

ICAO 24-bit transponder address · allocated to Australia

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

Hex
7C4439
Octal
37042071
Decimal
8,143,929
Country
AU
Tail
VH-NRF
Type
P28A
No current signal · last broadcast 5h ago
Flights observed
298
Distinct callsigns
1
Country
AU
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 7C4439.

Country allocation

The ICAO 24-bit address 7C4439 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
NRF - 298 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 NRF - Jul 14, 04:45 UTCJul 14, 05:15 UTC30m
2026-07-14 NRF TMW → TMW Jul 14, 02:25 UTCJul 14, 03:50 UTC1h 25m
2026-07-14 NRF - Jul 14, 00:15 UTCJul 14, 00:55 UTC40m
2026-07-13 NRF - Jul 13, 22:35 UTCJul 13, 23:05 UTC30m
2026-07-13 NRF - Jul 13, 04:35 UTCJul 13, 05:31 UTC55m
2026-07-13 NRF TMW → TMW Jul 13, 03:10 UTCJul 13, 03:45 UTC35m
2026-07-13 NRF TMW → TMW Jul 13, 01:40 UTCJul 13, 02:15 UTC35m
2026-07-12 NRF TMW → TMW Jul 12, 22:05 UTCJul 13, 00:45 UTC2h 40m
2026-07-12 NRF - Jul 12, 03:45 UTCJul 12, 04:55 UTC1h 10m
2026-07-11 NRF TMW → TMW Jul 11, 23:10 UTCJul 11, 23:15 UTC5m
2026-07-11 NRF - Jul 11, 05:45 UTCJul 11, 06:25 UTC40m
2026-07-11 NRF - Jul 11, 04:30 UTCJul 11, 05:10 UTC40m
2026-07-11 NRF - Jul 11, 03:20 UTCJul 11, 04:25 UTC1h 5m
2026-07-11 NRF - Jul 11, 02:05 UTCJul 11, 02:30 UTC25m
2026-07-11 NRF - Jul 11, 00:20 UTCJul 11, 00:35 UTC15m
2026-07-10 NRF TMW → TMW Jul 10, 22:40 UTCJul 10, 23:15 UTC35m
2026-07-10 NRF - Jul 10, 02:40 UTCJul 10, 03:10 UTC30m
2026-07-09 NRF - Jul 9, 22:35 UTCJul 10, 00:05 UTC1h 30m
2026-07-09 NRF - Jul 9, 21:20 UTCJul 9, 21:45 UTC25m
2026-07-09 NRF - Jul 9, 04:45 UTCJul 9, 06:35 UTC1h 50m
2026-07-09 NRF - Jul 9, 03:30 UTCJul 9, 03:55 UTC25m
2026-07-09 NRF - Jul 9, 02:15 UTCJul 9, 02:35 UTC20m
2026-07-08 NRF - Jul 8, 23:05 UTCJul 9, 00:10 UTC1h 5m
2026-07-08 NRF TMW → TMW Jul 8, 05:00 UTCJul 8, 05:35 UTC35m
2026-07-08 NRF TMW → TMW Jul 8, 03:20 UTCJul 8, 04:05 UTC45m
2026-07-07 NRF TMW → TMW Jul 7, 23:30 UTCJul 8, 01:25 UTC1h 55m
2026-07-07 NRF - Jul 7, 06:15 UTCJul 7, 06:25 UTC10m
2026-07-07 NRF - Jul 7, 04:15 UTCJul 7, 05:25 UTC1h 10m
2026-07-07 NRF TMW → TMW Jul 7, 01:10 UTCJul 7, 02:40 UTC1h 30m
2026-07-06 NRF TMW → TMW Jul 6, 21:55 UTCJul 6, 22:30 UTC35m
2026-07-06 NRF - Jul 6, 06:05 UTCJul 6, 06:35 UTC30m
2026-07-06 NRF TMW → TMW Jul 6, 04:35 UTCJul 6, 05:15 UTC40m
2026-07-06 NRF TMW → TMW Jul 6, 03:20 UTCJul 6, 03:50 UTC30m
2026-07-06 NRF TMW → TMW Jul 6, 00:45 UTCJul 6, 01:40 UTC55m
2026-07-05 NRF - Jul 5, 06:00 UTCJul 5, 06:30 UTC30m
2026-07-05 NRF - Jul 5, 04:35 UTCJul 5, 04:50 UTC15m
2026-07-05 NRF TMW → TMW Jul 5, 02:35 UTCJul 5, 03:25 UTC50m
2026-07-04 NRF - Jul 4, 05:30 UTCJul 4, 06:35 UTC1h 5m
2026-07-04 NRF - Jul 4, 02:20 UTCJul 4, 03:20 UTC1h 0m
2026-07-04 NRF - Jul 4, 00:35 UTCJul 4, 01:10 UTC35m
2026-07-03 NRF TMW → TMW Jul 3, 22:30 UTCJul 3, 22:50 UTC20m
2026-07-03 NRF - Jul 3, 06:00 UTCJul 3, 06:30 UTC30m
2026-07-03 NRF - Jul 3, 04:50 UTCJul 3, 05:25 UTC35m
2026-07-03 NRF TMW → NAA Jul 3, 03:15 UTCJul 3, 04:20 UTC1h 5m
2026-07-03 NRF TMW → TMW Jul 3, 00:30 UTCJul 3, 01:10 UTC40m
2026-07-01 NRF TMW → TMW Jul 1, 04:35 UTCJul 1, 05:15 UTC40m
2026-07-01 NRF TMW → TMW Jul 1, 02:25 UTCJul 1, 03:05 UTC40m
2026-07-01 NRF TMW → TMW Jul 1, 00:35 UTCJul 1, 01:20 UTC45m
2026-06-30 NRF TMW → TMW Jun 30, 22:55 UTCJun 30, 23:40 UTC45m
2026-06-30 NRF TMW → TMW Jun 30, 06:00 UTCJun 30, 06:40 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-NRF page for operator, model, and routing details .

Mode-S 7C4439 frequently asked

What is Mode-S code 7C4439?
7C4439 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-NRF.
Where is Mode-S 7C4439 registered?
Mode-S code 7C4439 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C4439 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C4439, octal 37042071, decimal 8,143,929.
What flights does 7C4439 operate?
Mode-S 7C4439 has broadcast 1 distinct callsign, including NRF.