Apparatus

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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 Jul 26, 22:00 UTC
Flights observed
506
Distinct callsigns
20
Country
AU
Last broadcast
Jul 26, 22:00 UTC

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
RXA6783 Regional Express 21 2026-07-25
RXA6776 Regional Express 18 2026-07-25
RXA6762 Regional Express 18 2026-07-24
RXA6463 - 16 2026-07-01
RXA6773 Regional Express 14 2026-07-24
RXA6767 Regional Express 12 2026-07-25
RXA6437 - 12 2026-07-05
RXA6436 - 12 2026-07-05
RXA6114 - 12 2026-07-12
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
RXA6588 - 9 2026-07-05
RXA6561 - 9 2026-07-05
RXA6869 Regional Express 8 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RXA6852 DBO → BHQ Jul 26, 21:20 UTCJul 26, 22:00 UTC40m
2026-07-26 RXA6869 DBO → SYD Jul 26, 08:45 UTCJul 26, 09:35 UTC50m
2026-07-26 RXA6866 SYD → BHQ Jul 26, 03:40 UTCJul 26, 04:15 UTC35m
2026-07-25 RXA6766 ABX → SYD Jul 25, 23:00 UTCJul 25, 23:50 UTC50m
2026-07-25 RXA6783 SYD → ABX Jul 25, 08:15 UTCJul 25, 09:10 UTC55m
2026-07-25 RXA6776 ABX → SYD Jul 25, 06:20 UTCJul 25, 07:10 UTC50m
2026-07-25 RXA6767 SYD → ABX Jul 25, 00:55 UTCJul 25, 01:45 UTC50m
2026-07-24 RXA6762 ABX → SYD Jul 24, 21:50 UTCJul 24, 22:45 UTC55m
2026-07-24 RXA6783 SYD → ABX Jul 24, 08:30 UTCJul 24, 09:20 UTC50m
2026-07-24 RXA6776 ABX → SYD Jul 24, 06:35 UTCJul 24, 07:25 UTC50m
2026-07-24 RXA6773 SYD → ABX Jul 24, 03:30 UTCJul 24, 04:20 UTC50m
2026-07-24 RXA6768 ABX → SYD Jul 24, 01:30 UTCJul 24, 02:20 UTC50m
2026-07-23 RXA6767 SYD → ABX Jul 23, 23:30 UTCJul 24, 00:20 UTC50m
2026-07-23 RXA6762 ABX → SYD Jul 23, 20:50 UTCJul 23, 21:45 UTC55m
2026-07-23 RXA6783 SYD → ABX Jul 23, 08:15 UTCJul 23, 09:05 UTC50m
2026-07-23 RXA6776 ABX → SYD Jul 23, 06:30 UTCJul 23, 07:20 UTC50m
2026-07-23 RXA6773 SYD → ABX Jul 23, 03:35 UTCJul 23, 04:25 UTC50m
2026-07-23 RXA6768 ABX → SYD Jul 23, 02:15 UTCJul 23, 02:55 UTC40m
2026-07-22 RXA6767 SYD → ABX Jul 22, 23:25 UTCJul 23, 00:15 UTC50m
2026-07-22 RXA6762 ABX → SYD Jul 22, 20:55 UTCJul 22, 21:50 UTC55m
2026-07-22 RXA6773 SYD → ABX Jul 22, 03:25 UTCJul 22, 04:20 UTC55m
2026-07-22 RXA6768 - Jul 22, 01:40 UTCJul 22, 02:20 UTC40m
2026-07-21 RXA6767 SYD → ABX Jul 21, 23:25 UTCJul 22, 00:15 UTC50m
2026-07-21 RXA6762 ABX → SYD Jul 21, 21:00 UTCJul 21, 22:00 UTC1h 0m
2026-07-21 RXA6783 SYD → ABX Jul 21, 08:25 UTCJul 21, 09:10 UTC45m
2026-07-21 RXA6776 ABX → SYD Jul 21, 06:20 UTCJul 21, 07:10 UTC50m
2026-07-21 RXA6773 SYD → ABX Jul 21, 04:10 UTCJul 21, 05:00 UTC50m
2026-07-21 RXA6768 - Jul 21, 02:40 UTCJul 21, 03:25 UTC45m
2026-07-21 RXA6767 SYD → ABX Jul 21, 00:45 UTCJul 21, 01:35 UTC50m
2026-07-20 RXA6762 - Jul 20, 23:05 UTCJul 20, 23:55 UTC49m
2026-07-20 RXA6783 SYD → ABX Jul 20, 08:25 UTCJul 20, 09:15 UTC50m
2026-07-20 RXA6776 ABX → SYD Jul 20, 06:20 UTCJul 20, 07:10 UTC50m
2026-07-20 RXA6773 SYD → ABX Jul 20, 03:10 UTCJul 20, 03:55 UTC45m
2026-07-20 RXA6768 - Jul 20, 01:50 UTCJul 20, 02:35 UTC45m
2026-07-19 RXA6767 SYD → ABX Jul 19, 23:50 UTCJul 20, 00:35 UTC45m
2026-07-19 RXA6762 - Jul 19, 21:20 UTCJul 19, 22:20 UTC1h 0m
2026-07-19 RXA6783 - Jul 19, 08:30 UTCJul 19, 09:20 UTC50m
2026-07-19 RXA6776 ABX → SYD Jul 19, 06:25 UTCJul 19, 07:15 UTC50m
2026-07-19 RXA6771 SYD → ABX Jul 19, 01:55 UTCJul 19, 02:40 UTC45m
2026-07-18 RXA6766 ABX → SYD Jul 18, 23:00 UTCJul 19, 00:00 UTC1h 0m
2026-07-18 RXA6783 - Jul 18, 08:10 UTCJul 18, 08:55 UTC45m
2026-07-18 RXA6776 - Jul 18, 06:30 UTCJul 18, 07:15 UTC45m
2026-07-18 RXA6767 SYD → ABX Jul 18, 01:34 UTCJul 18, 02:14 UTC40m
2026-07-17 RXA6762 - Jul 17, 23:55 UTCJul 18, 00:50 UTC55m
2026-07-17 RXA6783 - Jul 17, 08:54 UTCJul 17, 09:45 UTC50m
2026-07-17 RXA6776 - Jul 17, 06:54 UTCJul 17, 08:10 UTC1h 15m
2026-07-17 RXA6773 - Jul 17, 03:14 UTCJul 17, 03:55 UTC40m
2026-07-17 RXA6768 - Jul 17, 01:39 UTCJul 17, 02:34 UTC55m
2026-07-16 RXA6767 - Jul 16, 23:20 UTCJul 17, 00:04 UTC45m
2026-07-16 RXA6762 - Jul 16, 21:30 UTCJul 16, 22:30 UTC1h 0m

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 Jul 26, 22:00 UTC.
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, RXA6783, RXA6776, RXA6762.