Apparatus

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sensors Mode-S transponder

7C4403

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-NPX · AEROSPATIALE AS-350 Ecureuil · operated by STATE OF NEW SOUTH WALES REPRESENTED BY DEPARTMENT OF CLIMATE CHANGE, ENERGY, THE ENVIRONMENT AND WATER

Hex
7C4403
Octal
37042003
Decimal
8,143,875
Country
AU
Tail
VH-NPX
Type
AS50
No current signal · last broadcast 1d ago
Flights observed
56
Distinct callsigns
1
Country
AU
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7C4403.

Country allocation

The ICAO 24-bit address 7C4403 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
PKAR21 - 56 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 PKAR21 - May 29, 02:15 UTCMay 29, 02:30 UTC15m
2026-05-29 PKAR21 - May 29, 00:05 UTCMay 29, 00:55 UTC50m
2026-05-28 PKAR21 - May 28, 22:35 UTCMay 28, 23:05 UTC30m
2026-05-28 PKAR21 - May 28, 21:30 UTCMay 28, 21:50 UTC20m
2026-05-27 PKAR21 - May 27, 03:39 UTCMay 27, 07:10 UTC3h 30m
2026-05-27 PKAR21 - May 27, 00:10 UTCMay 27, 02:49 UTC2h 40m
2026-05-22 PKAR21 - May 22, 03:55 UTCMay 22, 05:10 UTC1h 15m
2026-05-10 PKAR21 - May 10, 05:45 UTCMay 10, 06:50 UTC1h 5m
2026-05-10 PKAR21 - May 10, 03:30 UTCMay 10, 05:04 UTC1h 35m
2026-05-09 PKAR21 BWU → BWU May 9, 22:49 UTCMay 9, 23:50 UTC1h 0m
2026-05-09 PKAR21 - May 9, 04:50 UTCMay 9, 06:20 UTC1h 30m
2026-05-09 PKAR21 - May 9, 02:50 UTCMay 9, 04:15 UTC1h 25m
2026-05-09 PKAR21 - May 9, 00:40 UTCMay 9, 01:50 UTC1h 10m
2026-05-08 PKAR21 - May 8, 23:45 UTCMay 9, 00:00 UTC15m
2026-05-08 PKAR21 - May 8, 06:39 UTCMay 8, 06:54 UTC15m
2026-05-08 PKAR21 - May 8, 01:59 UTCMay 8, 05:54 UTC3h 55m
2026-05-08 PKAR21 - May 8, 00:49 UTCMay 8, 01:04 UTC15m
2026-05-07 PKAR21 - May 7, 22:50 UTCMay 7, 23:14 UTC25m
2026-05-06 PKAR21 - May 6, 01:01 UTCMay 6, 01:35 UTC35m
2026-05-04 PKAR21 - May 4, 03:19 UTCMay 4, 04:00 UTC40m
2026-04-30 PKAR21 - Apr 30, 23:45 UTCMay 1, 00:05 UTC20m
2026-04-20 PKAR21 - Apr 20, 01:30 UTCApr 20, 01:45 UTC15m
2026-04-19 PKAR21 - Apr 19, 22:25 UTCApr 20, 00:20 UTC1h 55m
2026-04-19 PKAR21 - Apr 19, 20:35 UTCApr 19, 20:55 UTC20m
2026-04-19 PKAR21 - Apr 19, 04:15 UTCApr 19, 05:20 UTC1h 5m
2026-04-18 PKAR21 - Apr 18, 23:40 UTCApr 19, 00:40 UTC1h 0m
2026-04-18 PKAR21 - Apr 18, 05:25 UTCApr 18, 05:45 UTC20m
2026-04-18 PKAR21 - Apr 18, 05:00 UTCApr 18, 05:20 UTC20m
2026-04-17 PKAR21 - Apr 17, 23:25 UTCApr 18, 00:10 UTC45m
2026-04-17 PKAR21 - Apr 17, 04:50 UTCApr 17, 05:15 UTC25m
2026-04-17 PKAR21 - Apr 17, 01:40 UTCApr 17, 02:20 UTC40m
2026-04-16 PKAR21 - Apr 16, 23:20 UTCApr 16, 23:40 UTC20m
2026-04-16 PKAR21 - Apr 16, 22:50 UTCApr 16, 23:10 UTC20m
2026-04-16 PKAR21 - Apr 16, 07:09 UTCApr 16, 07:29 UTC20m
2026-04-16 PKAR21 - Apr 16, 05:09 UTCApr 16, 07:05 UTC1h 55m
2026-04-16 PKAR21 - Apr 16, 03:49 UTCApr 16, 05:05 UTC1h 15m
2026-04-16 PKAR21 - Apr 16, 01:10 UTCApr 16, 03:00 UTC1h 50m
2026-04-16 PKAR21 - Apr 16, 00:40 UTCApr 16, 01:05 UTC25m
2026-04-15 PKAR21 - Apr 15, 23:10 UTCApr 15, 23:25 UTC15m
2026-04-15 PKAR21 - Apr 15, 22:45 UTCApr 15, 23:00 UTC15m
2026-04-15 PKAR21 - Apr 15, 07:01 UTCApr 15, 07:10 UTC10m
2026-04-15 PKAR21 - Apr 15, 05:20 UTCApr 15, 06:55 UTC1h 35m
2026-04-15 PKAR21 - Apr 15, 03:00 UTCApr 15, 04:50 UTC1h 50m
2026-04-15 PKAR21 - Apr 15, 00:55 UTCApr 15, 02:05 UTC1h 10m
2026-04-15 PKAR21 - Apr 15, 00:00 UTCApr 15, 00:50 UTC50m
2026-04-14 PKAR21 - Apr 14, 22:25 UTCApr 14, 22:50 UTC25m
2026-04-14 PKAR21 - Apr 14, 07:10 UTCApr 14, 07:45 UTC35m
2026-04-14 PKAR21 - Apr 14, 05:15 UTCApr 14, 07:10 UTC1h 55m
2026-04-13 PKAR21 - Apr 13, 23:30 UTCApr 13, 23:40 UTC10m
2026-04-13 PKAR21 - Apr 13, 22:05 UTCApr 13, 22:25 UTC20m

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

Mode-S 7C4403 frequently asked

What is Mode-S code 7C4403?
7C4403 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-NPX.
Where is Mode-S 7C4403 registered?
Mode-S code 7C4403 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C4403 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C4403, octal 37042003, decimal 8,143,875.
What flights does 7C4403 operate?
Mode-S 7C4403 has broadcast 1 distinct callsign, including PKAR21.