Apparatus

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sensors Mode-S transponder

7C81E0

ICAO 24-bit transponder address · allocated to Australia

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

Hex
7C81E0
Octal
37100740
Decimal
8,159,712
Country
AU
Tail
VH-ZXU
Type
SF34
No current signal · last broadcast 20h ago
Flights observed
362
Distinct callsigns
20
Country
AU
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S 7C81E0.

Country allocation

The ICAO 24-bit address 7C81E0 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
RXA2268 - 36 2026-07-13
RXA2358 - 18 2026-07-13
RXA2131 - 17 2026-07-12
RXA2132 - 16 2026-07-12
RXA2357 - 15 2026-07-13
RXA2126 - 15 2026-07-12
RXA2125 - 15 2026-07-12
RXA2112 - 15 2026-07-12
RXA2133 - 14 2026-07-12
RXA2377 - 13 2026-06-26
RXA2375 - 13 2026-06-26
RXA2356 - 12 2026-06-26
RXA2376 - 10 2026-06-26
RXA2114 - 10 2026-07-04
RXA2113 - 10 2026-07-04
RXA2354 - 9 2026-06-24
RXA2353 - 9 2026-06-23
RXA2258 Regional Express 8 2026-06-13
RXA4632 - 6 2026-06-04
RXA4643 - 5 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 RXA2268 - Jul 13, 10:25 UTCJul 13, 11:00 UTC35m
2026-07-13 RXA2268 - Jul 13, 05:40 UTCJul 13, 06:25 UTC45m
2026-07-13 RXA2358 - Jul 13, 03:15 UTCJul 13, 03:55 UTC40m
2026-07-13 RXA2357 - Jul 13, 00:25 UTCJul 13, 01:05 UTC40m
2026-07-12 RXA2112 - Jul 12, 22:50 UTCJul 12, 23:35 UTC45m
2026-07-12 RXA2133 - Jul 12, 11:05 UTCJul 12, 11:50 UTC45m
2026-07-12 RXA2132 - Jul 12, 09:35 UTCJul 12, 10:20 UTC45m
2026-07-12 RXA2131 - Jul 12, 07:55 UTCJul 12, 08:40 UTC45m
2026-07-12 RXA2126 - Jul 12, 06:30 UTCJul 12, 07:20 UTC50m
2026-07-12 RXA2125 - Jul 12, 04:55 UTCJul 12, 05:40 UTC45m
2026-07-08 RXA2435 - Jul 8, 08:10 UTCJul 8, 08:55 UTC45m
2026-07-08 RXA2434 - Jul 8, 04:30 UTCJul 8, 05:15 UTC45m
2026-07-04 RXA2114 - Jul 4, 02:30 UTCJul 4, 03:20 UTC50m
2026-07-04 RXA2113 - Jul 4, 00:50 UTCJul 4, 01:35 UTC45m
2026-07-03 RXA2358 - Jul 3, 03:40 UTCJul 3, 04:15 UTC35m
2026-07-03 RXA2357 - Jul 3, 00:50 UTCJul 3, 01:30 UTC40m
2026-07-01 RXA2435 - Jul 1, 08:35 UTCJul 1, 09:20 UTC45m
2026-07-01 RXA2434 - Jul 1, 04:50 UTCJul 1, 05:40 UTC50m
2026-06-30 RXA2433 - Jun 30, 05:05 UTCJun 30, 06:00 UTC55m
2026-06-29 RXA2268 - Jun 29, 06:24 UTCJun 29, 07:25 UTC1h 0m
2026-06-26 RXA2356 - Jun 26, 23:34 UTCJun 27, 00:10 UTC35m
2026-06-26 RXA2377 - Jun 26, 11:05 UTCJun 26, 11:30 UTC25m
2026-06-26 RXA2376 - Jun 26, 09:39 UTCJun 26, 10:20 UTC40m
2026-06-26 RXA2375 - Jun 26, 06:50 UTCJun 26, 07:20 UTC30m
2026-06-24 RXA2132 - Jun 24, 10:04 UTCJun 24, 11:14 UTC1h 10m
2026-06-24 RXA2131 - Jun 24, 07:54 UTCJun 24, 08:39 UTC45m
2026-06-24 RXA2126 - Jun 24, 06:10 UTCJun 24, 06:59 UTC50m
2026-06-24 RXA2125 - Jun 24, 04:24 UTCJun 24, 05:09 UTC45m
2026-06-24 RXA2354 - Jun 24, 02:09 UTCJun 24, 02:45 UTC35m
2026-06-23 RXA2353 - Jun 23, 23:19 UTCJun 23, 23:55 UTC35m
2026-06-23 RXA2268 - Jun 23, 10:49 UTCJun 23, 11:35 UTC45m
2026-06-23 RXA2268 - Jun 23, 06:29 UTCJun 23, 07:15 UTC45m
2026-06-23 RXA2114 - Jun 23, 02:29 UTCJun 23, 03:25 UTC55m
2026-06-23 RXA2113 - Jun 23, 00:39 UTCJun 23, 01:30 UTC50m
2026-06-22 RXA2356 - Jun 22, 23:24 UTCJun 23, 00:00 UTC35m
2026-06-22 RXA2377 - Jun 22, 10:30 UTCJun 22, 11:00 UTC30m
2026-06-22 RXA2376 - Jun 22, 09:14 UTCJun 22, 09:49 UTC35m
2026-06-22 RXA2375 - Jun 22, 06:45 UTCJun 22, 07:14 UTC30m
2026-06-22 RXA2354 - Jun 22, 05:24 UTCJun 22, 05:54 UTC30m
2026-06-22 RXA2353 - Jun 22, 02:45 UTCJun 22, 03:19 UTC35m
2026-06-22 RXA2356 - Jun 22, 00:55 UTCJun 22, 01:29 UTC35m
2026-06-21 RXA2377 - Jun 21, 11:40 UTCJun 21, 12:14 UTC35m
2026-06-21 RXA2268 - Jun 21, 10:04 UTCJun 21, 10:44 UTC40m
2026-06-21 RXA2268 - Jun 21, 05:44 UTCJun 21, 06:24 UTC40m
2026-06-20 RXA2358 - Jun 20, 03:09 UTCJun 20, 03:44 UTC35m
2026-06-20 RXA2357 - Jun 20, 00:34 UTCJun 20, 01:14 UTC40m
2026-06-19 RXA2112 - Jun 19, 23:09 UTCJun 19, 23:54 UTC45m
2026-06-19 RXA2133 - Jun 19, 11:24 UTCJun 19, 12:14 UTC50m
2026-06-19 RXA2132 - Jun 19, 09:59 UTCJun 19, 10:50 UTC50m
2026-06-19 RXA2131 - Jun 19, 07:59 UTCJun 19, 08:50 UTC50m

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

Mode-S 7C81E0 frequently asked

What is Mode-S code 7C81E0?
7C81E0 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ZXU.
Where is Mode-S 7C81E0 registered?
Mode-S code 7C81E0 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C81E0 broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C81E0, octal 37100740, decimal 8,159,712.
What flights does 7C81E0 operate?
Mode-S 7C81E0 has broadcast 20 distinct callsigns, including RXA2268, RXA2358, RXA2131, RXA2132, RXA2357.