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sensors Mode-S transponder

7C81DC

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-ZXQ · SAAB 340 · operated by REGIONAL EXPRESS PTY LTD

Hex
7C81DC
Octal
37100734
Decimal
8,159,708
Country
AU
Tail
VH-ZXQ
Type
SF34
No current signal · last broadcast 3h ago
Flights observed
444
Distinct callsigns
20
Country
AU
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 7C81DC.

Country allocation

The ICAO 24-bit address 7C81DC 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 20 distinct

Callsign Airline Flights Last seen
RXA6133 - 24 2026-07-12
RXA6117 - 22 2026-07-13
RXA6463 - 16 2026-07-01
RXA6437 - 12 2026-07-05
RXA6436 - 12 2026-07-05
RXA6114 - 12 2026-07-12
RXA6783 - 11 2026-07-03
RXA6139 - 11 2026-07-12
RXA6829 - 10 2026-06-29
RXA6828 - 10 2026-06-29
RXA6825 - 10 2026-07-14
RXA6824 - 10 2026-07-13
RXA6558 - 10 2026-06-28
RXA6762 - 9 2026-07-03
RXA6588 - 9 2026-07-05
RXA6561 - 9 2026-07-05
RXA6776 - 8 2026-07-04
RXA6674 - 8 2026-07-11
RXA6477 - 8 2026-06-28
RXA6469 - 8 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RXA6438 - Jul 14, 09:10 UTCJul 14, 10:05 UTC55m
2026-07-14 RXA6833 - Jul 14, 07:25 UTCJul 14, 08:15 UTC50m
2026-07-14 RXA6832 - Jul 14, 05:40 UTCJul 14, 06:20 UTC40m
2026-07-14 RXA6529 - Jul 14, 04:00 UTCJul 14, 04:45 UTC45m
2026-07-14 RXA6528 - Jul 14, 02:30 UTCJul 14, 03:05 UTC35m
2026-07-14 RXA6825 - Jul 14, 00:25 UTCJul 14, 01:10 UTC45m
2026-07-13 RXA6824 - Jul 13, 22:45 UTCJul 13, 23:20 UTC35m
2026-07-13 RXA6821 - Jul 13, 20:50 UTCJul 13, 21:40 UTC50m
2026-07-13 RXA6836 - Jul 13, 09:20 UTCJul 13, 10:00 UTC40m
2026-07-13 RXA6833 - Jul 13, 07:40 UTCJul 13, 08:20 UTC40m
2026-07-13 RXA6832 - Jul 13, 05:55 UTCJul 13, 06:35 UTC40m
2026-07-13 RXA6529 - Jul 13, 04:50 UTCJul 13, 05:50 UTC1h 0m
2026-07-13 RXA6528 - Jul 13, 03:30 UTCJul 13, 04:05 UTC35m
2026-07-13 RXA6117 - Jul 13, 01:20 UTCJul 13, 02:10 UTC50m
2026-07-12 RXA6117 - Jul 12, 23:10 UTCJul 12, 23:55 UTC45m
2026-07-12 RXA6114 - Jul 12, 20:40 UTCJul 12, 22:05 UTC1h 25m
2026-07-12 RXA6139 - Jul 12, 08:40 UTCJul 12, 09:45 UTC1h 5m
2026-07-12 RXA6133 - Jul 12, 06:35 UTCJul 12, 07:31 UTC55m
2026-07-12 RXA6133 - Jul 12, 04:30 UTCJul 12, 05:15 UTC45m
2026-07-11 RXA6662 - Jul 11, 22:45 UTCJul 11, 23:25 UTC40m
2026-07-11 RXA6681 - Jul 11, 08:50 UTCJul 11, 09:35 UTC45m
2026-07-11 RXA6674 - Jul 11, 07:15 UTCJul 11, 07:55 UTC40m
2026-07-11 RXA6673 - Jul 11, 05:25 UTCJul 11, 06:10 UTC45m
2026-07-11 RXA6668 - Jul 11, 03:01 UTCJul 11, 03:40 UTC40m
2026-07-10 RXA6661 - Jul 10, 22:55 UTCJul 10, 23:40 UTC45m
2026-07-10 RXA6658 - Jul 10, 21:00 UTCJul 10, 21:55 UTC55m
2026-07-10 RXA6681 - Jul 10, 09:30 UTCJul 10, 10:10 UTC40m
2026-07-10 RXA6674 - Jul 10, 07:45 UTCJul 10, 09:20 UTC1h 35m
2026-07-10 RXA6673 - Jul 10, 05:25 UTCJul 10, 06:10 UTC45m
2026-07-10 RXA6668 - Jul 10, 03:05 UTCJul 10, 03:50 UTC45m
2026-07-09 RXA6661 - Jul 9, 22:55 UTCJul 9, 23:35 UTC40m
2026-07-09 RXA6658 - Jul 9, 21:00 UTCJul 9, 22:05 UTC1h 5m
2026-07-09 RXA3286 - Jul 9, 08:40 UTCJul 9, 09:20 UTC40m
2026-07-09 RXA3281 - Jul 9, 07:05 UTCJul 9, 07:40 UTC35m
2026-07-06 RXA6661 - Jul 6, 23:25 UTCJul 7, 00:05 UTC40m
2026-07-06 RXA6363 - Jul 6, 00:40 UTCJul 6, 01:35 UTC55m
2026-07-05 RXA6362 SYD → PQQ Jul 5, 23:15 UTCJul 6, 00:00 UTC45m
2026-07-05 RXA6561 - Jul 5, 21:20 UTCJul 5, 22:25 UTC1h 5m
2026-07-05 RXA6588 - Jul 5, 08:50 UTCJul 5, 09:20 UTC30m
2026-07-05 RXA6437 - Jul 5, 06:30 UTCJul 5, 07:40 UTC1h 10m
2026-07-05 RXA6436 SYD → NBH Jul 5, 04:40 UTCJul 5, 05:30 UTC50m
2026-07-04 RXA6776 ABX → SYD Jul 4, 06:05 UTCJul 4, 07:15 UTC1h 10m
2026-07-03 RXA6767 SYD → ABX Jul 3, 23:35 UTCJul 4, 00:45 UTC1h 10m
2026-07-03 RXA6762 ABX → SYD Jul 3, 20:25 UTCJul 3, 21:35 UTC1h 10m
2026-07-03 RXA6783 - Jul 3, 09:05 UTCJul 3, 10:15 UTC1h 10m
2026-07-03 RXA6776 ABX → SYD Jul 3, 07:05 UTCJul 3, 08:55 UTC1h 50m
2026-07-03 RXA6773 SYD → ABX Jul 3, 03:25 UTCJul 3, 04:50 UTC1h 25m
2026-07-03 RXA6417 - Jul 3, 01:05 UTCJul 3, 02:10 UTC1h 5m
2026-07-02 RXA6416 - Jul 2, 23:25 UTCJul 3, 00:20 UTC55m
2026-07-02 RXA6762 ABX → SYD Jul 2, 20:40 UTCJul 2, 21:45 UTC1h 5m

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

Mode-S 7C81DC frequently asked

What is Mode-S code 7C81DC?
7C81DC is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ZXQ.
Where is Mode-S 7C81DC registered?
Mode-S code 7C81DC is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C81DC broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C81DC, octal 37100734, decimal 8,159,708.
What flights does 7C81DC operate?
Mode-S 7C81DC has broadcast 20 distinct callsigns, including RXA6133, RXA6117, RXA6463, RXA6437, RXA6436.