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sensors Mode-S transponder

7C81D6

ICAO 24-bit transponder address · allocated to Australia

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

Hex
7C81D6
Octal
37100726
Decimal
8,159,702
Country
AU
Tail
VH-ZXK
Type
SF34
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
535
Distinct callsigns
20
Country
AU
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S 7C81D6.

Country allocation

The ICAO 24-bit address 7C81D6 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
RXA6117 Regional Express 13 2026-07-23
RXA6558 Regional Express 10 2026-05-08
RXA6413 Regional Express 8 2026-07-24
RXA3469 - 8 2026-07-10
RXA2356 - 8 2026-06-12
RXA6783 Regional Express 7 2026-05-11
RXA6417 Regional Express 7 2026-07-25
RXA6133 Regional Express 7 2026-07-26
RXA4398 - 7 2026-07-01
RXA4357 - 7 2026-07-02
RXA4351 - 7 2026-07-01
RXA3579 - 7 2026-07-12
RXA3578 - 7 2026-07-12
RXA3577 - 7 2026-07-12
RXA3554 - 7 2026-07-12
RXA3468 - 7 2026-07-10
RXA2377 Regional Express 7 2026-06-12
RXA2375 Regional Express 7 2026-06-13
RXA6776 Regional Express 6 2026-05-11
RXA6773 Regional Express 6 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RXA6114 MIM → SYD Jul 26, 21:20 UTCJul 26, 21:30 UTC10m
2026-07-26 RXA6139 SYD → MYA Jul 26, 08:35 UTCJul 26, 09:35 UTC1h 0m
2026-07-26 RXA6133 MIM → MYA Jul 26, 05:55 UTCJul 26, 07:20 UTC1h 26m
2026-07-26 RXA6133 MIM → MYA Jul 26, 04:20 UTCJul 26, 05:05 UTC45m
2026-07-25 RXA6417 CFS → SYD Jul 25, 02:00 UTCJul 25, 03:15 UTC1h 15m
2026-07-25 RXA6416 SYD → CFS Jul 25, 00:30 UTCJul 25, 01:20 UTC50m
2026-07-24 RXA6413 CFS → SYD Jul 24, 21:50 UTCJul 24, 23:15 UTC1h 25m
2026-07-24 RXA6438 SYD → CFS Jul 24, 08:45 UTCJul 24, 09:40 UTC55m
2026-07-24 RXA6373 PQQ → SYD Jul 24, 06:45 UTCJul 24, 07:55 UTC1h 10m
2026-07-24 RXA6372 SYD → PQQ Jul 24, 05:20 UTCJul 24, 06:05 UTC45m
2026-07-24 RXA6177 OAG → SYD Jul 24, 03:55 UTCJul 24, 04:30 UTC35m
2026-07-24 RXA6174 SYD → OAG Jul 24, 02:50 UTCJul 24, 03:15 UTC25m
2026-07-24 RXA6363 PQQ → SYD Jul 24, 01:05 UTCJul 24, 02:00 UTC55m
2026-07-23 RXA6362 SYD → PQQ Jul 23, 23:50 UTCJul 24, 01:00 UTC1h 10m
2026-07-23 RXA6561 OAG → SYD Jul 23, 21:45 UTCJul 23, 22:25 UTC40m
2026-07-23 RXA6588 - Jul 23, 09:05 UTCJul 23, 09:45 UTC40m
2026-07-23 RXA6437 CFS → SYD Jul 23, 06:55 UTCJul 23, 07:55 UTC1h 0m
2026-07-23 RXA6436 SYD → CFS Jul 23, 04:40 UTCJul 23, 05:35 UTC55m
2026-07-23 RXA6117 MIM → MYA Jul 23, 01:00 UTCJul 23, 02:15 UTC1h 15m
2026-07-22 RXA6117 MIM → MYA Jul 22, 23:25 UTCJul 23, 00:10 UTC45m
2026-07-22 RXA6114 MIM → SYD Jul 22, 20:50 UTCJul 22, 22:15 UTC1h 25m
2026-07-22 RXA6133 MIM → MYA Jul 22, 04:30 UTCJul 22, 05:15 UTC45m
2026-07-22 RXA6426 CFS → SYD Jul 22, 01:40 UTCJul 22, 02:45 UTC1h 5m
2026-07-22 RXA6426 CFS → SYD Jul 22, 00:45 UTCJul 22, 00:55 UTC10m
2026-07-21 RXA6426 CFS → SYD Jul 21, 23:30 UTCJul 22, 00:40 UTC1h 10m
2026-07-21 RXA6821 DBO → SYD Jul 21, 21:45 UTCJul 21, 22:25 UTC40m
2026-07-21 RXA6836 SYD → DBO Jul 21, 09:30 UTCJul 21, 10:05 UTC35m
2026-07-21 RXA6437 CFS → SYD Jul 21, 07:00 UTCJul 21, 08:10 UTC1h 10m
2026-07-21 RXA6436 - Jul 21, 05:20 UTCJul 21, 06:15 UTC55m
2026-07-21 RXA6825 - Jul 21, 01:00 UTCJul 21, 01:50 UTC50m
2026-07-20 RXA6824 - Jul 20, 23:35 UTCJul 21, 00:15 UTC40m
2026-07-20 RXA6821 DBO → SYD Jul 20, 21:45 UTCJul 20, 22:25 UTC40m
2026-07-20 RXA6836 SYD → DBO Jul 20, 09:30 UTCJul 20, 10:05 UTC35m
2026-07-20 RXA6833 DBO → SYD Jul 20, 07:20 UTCJul 20, 08:10 UTC50m
2026-07-20 RXA6832 SYD → DBO Jul 20, 05:45 UTCJul 20, 06:20 UTC35m
2026-07-19 RXA6363 - Jul 19, 23:45 UTCJul 20, 02:00 UTC2h 15m
2026-07-19 RXA6561 - Jul 19, 21:55 UTCJul 19, 22:40 UTC45m
2026-07-19 RXA6588 - Jul 19, 09:00 UTCJul 19, 09:35 UTC35m
2026-07-19 RXA6437 CFS → SYD Jul 19, 06:35 UTCJul 19, 07:45 UTC1h 10m
2026-07-19 RXA6436 - Jul 19, 04:45 UTCJul 19, 05:45 UTC1h 0m
2026-07-18 RXA6417 - Jul 18, 01:00 UTCJul 18, 02:05 UTC1h 5m
2026-07-17 RXA6416 SYD → NBH Jul 17, 23:25 UTCJul 18, 00:19 UTC55m
2026-07-17 RXA6413 - Jul 17, 20:40 UTCJul 17, 22:00 UTC1h 20m
2026-07-17 RXA6438 - Jul 17, 09:25 UTCJul 17, 10:30 UTC1h 5m
2026-07-17 RXA6373 PQQ → SYD Jul 17, 07:20 UTCJul 17, 08:40 UTC1h 20m
2026-07-17 RXA6372 - Jul 17, 05:20 UTCJul 17, 06:05 UTC45m
2026-07-17 RXA6177 - Jul 17, 03:50 UTCJul 17, 04:35 UTC45m
2026-07-17 RXA6174 - Jul 17, 02:45 UTCJul 17, 03:10 UTC25m
2026-07-16 RXA6362 SYD → SYD Jul 16, 23:35 UTCJul 17, 01:45 UTC2h 10m
2026-07-16 RXA6561 - Jul 16, 21:35 UTCJul 16, 22:30 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-ZXK page for operator, model, and routing details .

Mode-S 7C81D6 frequently asked

What is Mode-S code 7C81D6?
7C81D6 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ZXK.
Where is Mode-S 7C81D6 registered?
Mode-S code 7C81D6 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C81D6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C81D6, octal 37100726, decimal 8,159,702.
What flights does 7C81D6 operate?
Mode-S 7C81D6 has broadcast 20 distinct callsigns, including RXA6117, RXA6558, RXA6413, RXA3469, RXA2356.