Apparatus

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sensors Mode-S transponder

7C673A

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-UOC · CESSNA 208 Caravan · operated by HARDY AVIATION (N.T.) PTY LIMITED

Hex
7C673A
Octal
37063472
Decimal
8,152,890
Country
AU
Tail
VH-UOC
Type
C208
No current signal · last broadcast 1d ago
Flights observed
36
Distinct callsigns
1
Country
AU
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7C673A.

Country allocation

The ICAO 24-bit address 7C673A 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
UOC - 36 2026-05-29

Recent flights last 36

DateFlightRouteTakeoffLandingDuration
2026-05-29 UOC - May 29, 04:10 UTCMay 29, 04:25 UTC15m
2026-05-29 UOC - May 29, 00:30 UTCMay 29, 00:40 UTC10m
2026-05-28 UOC - May 28, 05:40 UTCMay 28, 05:50 UTC10m
2026-05-28 UOC - May 28, 01:50 UTCMay 28, 02:00 UTC10m
2026-05-27 UOC - May 27, 22:45 UTCMay 27, 22:55 UTC10m
2026-05-26 UOC - May 26, 00:14 UTCMay 26, 00:29 UTC15m
2026-05-25 UOC - May 25, 05:45 UTCMay 25, 06:00 UTC15m
2026-05-20 UOC - May 20, 05:10 UTCMay 20, 05:20 UTC10m
2026-05-20 UOC - May 20, 01:40 UTCMay 20, 01:50 UTC10m
2026-05-19 UOC - May 19, 22:35 UTCMay 19, 22:45 UTC10m
2026-05-18 UOC - May 18, 22:20 UTCMay 18, 22:30 UTC10m
2026-05-17 UOC - May 17, 22:50 UTCMay 17, 23:00 UTC10m
2026-05-15 UOC - May 15, 06:50 UTCMay 15, 07:00 UTC10m
2026-05-15 UOC - May 15, 01:50 UTCMay 15, 02:00 UTC10m
2026-05-14 UOC - May 14, 02:05 UTCMay 14, 02:20 UTC15m
2026-05-13 UOC - May 13, 06:55 UTCMay 13, 07:05 UTC10m
2026-05-12 UOC - May 12, 23:05 UTCMay 12, 23:15 UTC10m
2026-05-12 UOC - May 12, 06:40 UTCMay 12, 06:50 UTC10m
2026-05-12 UOC - May 12, 05:50 UTCMay 12, 06:00 UTC10m
2026-05-11 UOC - May 11, 06:10 UTCMay 11, 06:20 UTC10m
2026-05-11 UOC - May 11, 05:15 UTCMay 11, 05:30 UTC15m
2026-05-11 UOC - May 11, 02:15 UTCMay 11, 02:25 UTC10m
2026-05-08 UOC - May 8, 06:09 UTCMay 8, 06:25 UTC15m
2026-05-08 UOC - May 8, 03:55 UTCMay 8, 04:04 UTC10m
2026-05-07 UOC - May 7, 06:30 UTCMay 7, 06:45 UTC15m
2026-05-07 UOC - May 7, 03:15 UTCMay 7, 03:25 UTC10m
2026-04-29 UOC - Apr 29, 22:35 UTCApr 29, 22:45 UTC10m
2026-04-23 UOC - Apr 23, 06:01 UTCApr 23, 06:10 UTC10m
2026-04-20 UOC - Apr 20, 22:40 UTCApr 20, 22:50 UTC10m
2026-04-20 UOC - Apr 20, 06:20 UTCApr 20, 06:30 UTC10m
2026-04-20 UOC - Apr 20, 02:15 UTCApr 20, 02:25 UTC10m
2026-04-19 UOC - Apr 19, 23:00 UTCApr 19, 23:10 UTC10m
2026-04-16 UOC - Apr 16, 00:45 UTCApr 16, 01:05 UTC20m
2026-04-15 UOC - Apr 15, 05:30 UTCApr 15, 05:40 UTC10m
2026-04-15 UOC - Apr 15, 01:50 UTCApr 15, 02:00 UTC10m
2026-04-13 UOC - Apr 13, 23:10 UTCApr 13, 23:25 UTC15m

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

Mode-S 7C673A frequently asked

What is Mode-S code 7C673A?
7C673A is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-UOC.
Where is Mode-S 7C673A registered?
Mode-S code 7C673A is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C673A 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 7C673A, octal 37063472, decimal 8,152,890.
What flights does 7C673A operate?
Mode-S 7C673A has broadcast 1 distinct callsign, including UOC.