Apparatus

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sensors Mode-S transponder

7C57A2

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-RLG · CESSNA 172 Skyhawk · operated by ROYAL VICTORIAN AERO CLUB.

Hex
7C57A2
Octal
37053642
Decimal
8,148,898
Country
AU
Tail
VH-RLG
Type
C172
No current signal · last broadcast Jul 26, 04:35 UTC
Flights observed
85
Distinct callsigns
1
Country
AU
Last broadcast
Jul 26, 04:35 UTC

Last known position

Most recent position reported by Mode-S 7C57A2.

Country allocation

The ICAO 24-bit address 7C57A2 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
RLG - 85 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RLG MBW → MBW Jul 26, 03:55 UTCJul 26, 04:35 UTC40m
2026-07-26 RLG MBW → MBW Jul 26, 00:50 UTCJul 26, 01:05 UTC15m
2026-07-26 RLG MBW → MBW Jul 26, 00:00 UTCJul 26, 00:15 UTC15m
2026-07-25 RLG MBW → MBW Jul 25, 05:50 UTCJul 25, 06:40 UTC50m
2026-07-23 RLG MBW → MBW Jul 23, 04:50 UTCJul 23, 05:30 UTC40m
2026-07-20 RLG MBW → MBW Jul 20, 23:45 UTCJul 21, 00:10 UTC25m
2026-07-19 RLG MBW → MBW Jul 19, 06:20 UTCJul 19, 07:00 UTC40m
2026-07-18 RLG - Jul 18, 04:10 UTCJul 18, 04:55 UTC45m
2026-07-16 RLG - Jul 16, 03:25 UTCJul 16, 03:55 UTC30m
2026-07-15 RLG MBW → MBW Jul 15, 04:05 UTCJul 15, 04:45 UTC40m
2026-07-11 RLG MBW → MBW Jul 11, 02:05 UTCJul 11, 02:45 UTC40m
2026-07-10 RLG MBW → MBW Jul 10, 03:30 UTCJul 10, 04:15 UTC45m
2026-07-09 RLG - Jul 9, 23:25 UTCJul 9, 23:50 UTC25m
2026-07-09 RLG MBW → MBW Jul 9, 22:50 UTCJul 9, 23:10 UTC20m
2026-07-08 RLG MBW → MBW Jul 8, 06:45 UTCJul 8, 07:20 UTC35m
2026-07-08 RLG MBW → MBW Jul 8, 06:20 UTCJul 8, 06:40 UTC20m
2026-07-08 RLG MBW → MBW Jul 8, 02:50 UTCJul 8, 03:05 UTC15m
2026-07-04 RLG MBW → MBW Jul 4, 05:35 UTCJul 4, 06:35 UTC1h 0m
2026-07-01 RLG MBW → MBW Jul 1, 04:25 UTCJul 1, 06:00 UTC1h 35m
2026-07-01 RLG MBW → MBW Jul 1, 02:35 UTCJul 1, 03:10 UTC35m
2026-06-28 RLG MBW → MBW Jun 28, 06:05 UTCJun 28, 06:44 UTC40m
2026-06-28 RLG MBW → MBW Jun 28, 04:10 UTCJun 28, 04:35 UTC25m
2026-06-28 RLG MBW → MBW Jun 28, 02:39 UTCJun 28, 03:09 UTC30m
2026-06-21 RLG MBW → MBW Jun 21, 06:14 UTCJun 21, 06:50 UTC35m
2026-06-14 RLG - Jun 14, 01:50 UTCJun 14, 02:25 UTC35m
2026-06-14 RLG MBW → MBW Jun 14, 00:05 UTCJun 14, 00:40 UTC35m
2026-06-13 RLG MBW → MBW Jun 13, 04:20 UTCJun 13, 04:50 UTC30m
2026-06-13 RLG - Jun 13, 00:55 UTCJun 13, 01:25 UTC30m
2026-06-12 RLG - Jun 12, 21:50 UTCJun 12, 22:45 UTC55m
2026-06-12 RLG MBW → MBW Jun 12, 06:40 UTCJun 12, 07:15 UTC35m
2026-06-12 RLG MBW → MBW Jun 12, 06:25 UTCJun 12, 06:30 UTC5m
2026-06-10 RLG - Jun 10, 06:25 UTCJun 10, 06:40 UTC15m
2026-06-10 RLG MBW → MBW Jun 10, 06:05 UTCJun 10, 06:20 UTC15m
2026-06-03 RLG MBW → MBW Jun 3, 03:40 UTCJun 3, 04:15 UTC35m
2026-05-30 RLG MBW → MBW May 30, 05:30 UTCMay 30, 06:30 UTC1h 0m
2026-05-30 RLG MBW → MBW May 30, 03:00 UTCMay 30, 03:20 UTC20m
2026-05-22 RLG MBW → MBW May 22, 02:55 UTCMay 22, 03:30 UTC35m
2026-05-21 RLG MBW → MBW May 21, 04:50 UTCMay 21, 05:50 UTC1h 0m
2026-05-20 RLG - May 20, 04:20 UTCMay 20, 04:50 UTC31m
2026-05-20 RLG - May 20, 01:55 UTCMay 20, 02:15 UTC20m
2026-05-19 RLG - May 19, 23:25 UTCMay 19, 23:45 UTC20m
2026-05-19 RLG MBW → MBW May 19, 04:00 UTCMay 19, 05:40 UTC1h 40m
2026-05-16 RLG MBW → MBW May 16, 05:46 UTCMay 16, 06:06 UTC20m
2026-05-16 RLG - May 16, 03:35 UTCMay 16, 04:15 UTC40m
2026-05-16 RLG - May 16, 01:05 UTCMay 16, 01:50 UTC45m
2026-05-15 RLG MBW → MBW May 15, 06:25 UTCMay 15, 07:10 UTC45m
2026-05-15 RLG MBW → MBW May 15, 04:20 UTCMay 15, 04:45 UTC25m
2026-05-15 RLG - May 15, 02:25 UTCMay 15, 03:15 UTC50m
2026-05-14 RLG MBW → MBW May 14, 05:10 UTCMay 14, 05:55 UTC45m
2026-05-14 RLG MBW → MBW May 14, 04:05 UTCMay 14, 04:30 UTC25m

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

Mode-S 7C57A2 frequently asked

What is Mode-S code 7C57A2?
7C57A2 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-RLG.
Where is Mode-S 7C57A2 registered?
Mode-S code 7C57A2 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C57A2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 04:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C57A2, octal 37053642, decimal 8,148,898.
What flights does 7C57A2 operate?
Mode-S 7C57A2 has broadcast 1 distinct callsign, including RLG.