Apparatus

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sensors Mode-S transponder

7C4A28

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-OXM · PIPER PA-44 Seminole · operated by OXFORD AVIATION ACADEMY (AUSTRALIA) PTY LTD

Hex
7C4A28
Octal
37045050
Decimal
8,145,448
Country
AU
Tail
VH-OXM
Type
PA44
No current signal · last broadcast 7h ago
Flights observed
58
Distinct callsigns
1
Country
AU
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 7C4A28.

Country allocation

The ICAO 24-bit address 7C4A28 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
OXM - 58 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 OXM MEB → MBW May 30, 01:25 UTCMay 30, 03:45 UTC2h 20m
2026-05-30 OXM MBW → MEB May 30, 01:00 UTCMay 30, 01:15 UTC15m
2026-05-25 OXM - May 25, 05:55 UTCMay 25, 06:50 UTC55m
2026-05-25 OXM MBW → MBW May 25, 04:00 UTCMay 25, 05:05 UTC1h 5m
2026-05-23 OXM MBW → MBW May 23, 02:00 UTCMay 23, 03:05 UTC1h 5m
2026-05-22 OXM MBW → MBW May 22, 22:50 UTCMay 22, 23:50 UTC1h 0m
2026-05-22 OXM MBW → MBW May 22, 00:10 UTCMay 22, 02:00 UTC1h 50m
2026-05-21 OXM - May 21, 05:05 UTCMay 21, 05:15 UTC10m
2026-05-21 OXM - May 21, 04:15 UTCMay 21, 04:55 UTC40m
2026-05-21 OXM - May 21, 01:40 UTCMay 21, 02:50 UTC1h 10m
2026-05-20 OXM MBW → MBW May 20, 06:20 UTCMay 20, 07:10 UTC50m
2026-05-20 OXM - May 20, 02:05 UTCMay 20, 04:05 UTC2h 0m
2026-05-20 OXM MBW → MEB May 20, 01:45 UTCMay 20, 01:55 UTC10m
2026-05-14 OXM MBW → MBW May 14, 05:30 UTCMay 14, 07:10 UTC1h 40m
2026-05-14 OXM MBW → MBW May 14, 02:40 UTCMay 14, 04:00 UTC1h 20m
2026-05-14 OXM MBW → MBW May 14, 00:25 UTCMay 14, 01:10 UTC45m
2026-05-13 OXM MBW → MBW May 13, 06:50 UTCMay 13, 07:40 UTC50m
2026-05-13 OXM MBW → MBW May 13, 04:30 UTCMay 13, 05:35 UTC1h 5m
2026-05-13 OXM MBW → MBW May 13, 00:30 UTCMay 13, 01:10 UTC40m
2026-05-12 OXM MBW → MBW May 12, 04:50 UTCMay 12, 06:05 UTC1h 15m
2026-05-12 OXM MBW → MBW May 12, 02:45 UTCMay 12, 03:25 UTC40m
2026-05-11 OXM - May 11, 06:15 UTCMay 11, 06:50 UTC35m
2026-05-11 OXM - May 11, 05:05 UTCMay 11, 05:40 UTC35m
2026-05-11 OXM - May 11, 04:35 UTCMay 11, 04:50 UTC15m
2026-05-11 OXM MBW → MBW May 11, 02:25 UTCMay 11, 03:35 UTC1h 10m
2026-05-10 OXM MBW → MBW May 10, 03:00 UTCMay 10, 04:00 UTC1h 0m
2026-05-08 OXM MBW → MBW May 8, 05:29 UTCMay 8, 06:25 UTC55m
2026-05-08 OXM MBW → MBW May 8, 02:44 UTCMay 8, 03:30 UTC45m
2026-05-06 OXM MBW → MBW May 6, 04:25 UTCMay 6, 05:25 UTC1h 0m
2026-05-05 OXM MBW → MBW May 5, 04:55 UTCMay 5, 06:00 UTC1h 5m
2026-05-05 OXM - May 5, 03:40 UTCMay 5, 03:50 UTC10m
2026-05-05 OXM MBW → MBW May 5, 02:40 UTCMay 5, 03:35 UTC55m
2026-04-30 OXM MBW → MBW Apr 30, 05:00 UTCApr 30, 06:05 UTC1h 5m
2026-04-30 OXM MBW → MBW Apr 30, 02:00 UTCApr 30, 02:55 UTC55m
2026-04-29 OXM MBW → MBW Apr 29, 01:59 UTCApr 29, 02:35 UTC35m
2026-04-28 OXM MBW → MBW Apr 28, 05:25 UTCApr 28, 06:30 UTC1h 5m
2026-04-28 OXM MBW → MBW Apr 28, 02:40 UTCApr 28, 03:55 UTC1h 15m
2026-04-28 OXM MBW → MBW Apr 28, 00:05 UTCApr 28, 01:15 UTC1h 10m
2026-04-27 OXM MBW → MBW Apr 27, 22:05 UTCApr 27, 23:15 UTC1h 10m
2026-04-27 OXM - Apr 27, 06:45 UTCApr 27, 07:50 UTC1h 5m
2026-04-27 OXM MBW → MBW Apr 27, 04:55 UTCApr 27, 06:00 UTC1h 5m
2026-04-24 OXM - Apr 24, 07:25 UTCApr 24, 07:35 UTC10m
2026-04-24 OXM - Apr 24, 06:45 UTCApr 24, 07:15 UTC30m
2026-04-24 OXM - Apr 24, 04:20 UTCApr 24, 05:25 UTC1h 5m
2026-04-23 OXM MBW → MBW Apr 23, 01:55 UTCApr 23, 02:40 UTC45m
2026-04-22 OXM - Apr 22, 05:40 UTCApr 22, 05:55 UTC15m
2026-04-22 OXM MBW → MBW Apr 22, 04:55 UTCApr 22, 05:35 UTC40m
2026-04-21 OXM MEB → MBW Apr 21, 01:00 UTCApr 21, 03:10 UTC2h 10m
2026-04-21 OXM MBW → MEB Apr 21, 00:40 UTCApr 21, 00:50 UTC10m
2026-04-20 OXM MBW → MBW Apr 20, 04:30 UTCApr 20, 05:25 UTC55m

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

Mode-S 7C4A28 frequently asked

What is Mode-S code 7C4A28?
7C4A28 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-OXM.
Where is Mode-S 7C4A28 registered?
Mode-S code 7C4A28 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C4A28 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C4A28, octal 37045050, decimal 8,145,448.
What flights does 7C4A28 operate?
Mode-S 7C4A28 has broadcast 1 distinct callsign, including OXM.