Apparatus

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sensors Mode-S transponder

7C5E99

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-SYZ · AGUSTA AW-139 · operated by LLOYD HELICOPTERS PTY. LTD.

Hex
7C5E99
Octal
37057231
Decimal
8,150,681
Country
AU
Tail
VH-SYZ
Type
A139
No current signal · last broadcast 20h ago
Flights observed
63
Distinct callsigns
3
Country
AU
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S 7C5E99.

Country allocation

The ICAO 24-bit address 7C5E99 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 3 distinct

Callsign Airline Flights Last seen
CHOP21 - 31 2026-07-17
CHOP41 - 30 2026-05-11
CHOP22 - 2 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CHOP21 - Jul 17, 03:05 UTCJul 17, 03:50 UTC45m
2026-07-16 CHOP21 - Jul 16, 02:50 UTCJul 16, 03:10 UTC20m
2026-07-16 CHOP21 - Jul 16, 01:30 UTCJul 16, 01:40 UTC10m
2026-07-14 CHOP21 - Jul 14, 09:15 UTCJul 14, 09:40 UTC25m
2026-07-14 CHOP21 - Jul 14, 07:40 UTCJul 14, 08:00 UTC20m
2026-07-13 CHOP21 - Jul 13, 00:45 UTCJul 13, 01:30 UTC45m
2026-07-10 CHOP21 - Jul 10, 01:25 UTCJul 10, 01:40 UTC15m
2026-07-10 CHOP21 - Jul 10, 00:10 UTCJul 10, 00:20 UTC10m
2026-07-09 CHOP21 - Jul 9, 01:40 UTCJul 9, 01:55 UTC15m
2026-07-09 CHOP21 - Jul 9, 00:40 UTCJul 9, 00:55 UTC15m
2026-07-07 CHOP21 - Jul 7, 23:45 UTCJul 7, 23:55 UTC10m
2026-07-06 CHOP21 - Jul 6, 08:20 UTCJul 6, 08:50 UTC30m
2026-07-06 CHOP21 - Jul 6, 07:15 UTCJul 6, 07:45 UTC30m
2026-07-06 CHOP21 - Jul 6, 02:35 UTCJul 6, 02:45 UTC10m
2026-07-06 CHOP21 - Jul 6, 01:20 UTCJul 6, 01:30 UTC10m
2026-07-02 CHOP21 - Jul 2, 09:40 UTCJul 2, 10:40 UTC1h 0m
2026-07-02 CHOP21 - Jul 2, 08:55 UTCJul 2, 09:05 UTC10m
2026-07-02 CHOP21 - Jul 2, 05:05 UTCJul 2, 05:15 UTC10m
2026-07-02 CHOP21 - Jul 2, 03:45 UTCJul 2, 03:55 UTC10m
2026-07-01 CHOP21 - Jul 1, 00:55 UTCJul 1, 01:40 UTC45m
2026-06-24 CHOP21 - Jun 24, 01:24 UTCJun 24, 02:20 UTC55m
2026-06-23 CHOP21 - Jun 23, 02:20 UTCJun 23, 02:40 UTC20m
2026-06-23 CHOP21 - Jun 23, 01:10 UTCJun 23, 01:20 UTC10m
2026-06-17 CHOP21 - Jun 17, 02:05 UTCJun 17, 02:20 UTC15m
2026-06-17 CHOP21 - Jun 17, 00:50 UTCJun 17, 01:05 UTC15m
2026-06-16 CHOP21 - Jun 16, 07:40 UTCJun 16, 08:25 UTC45m
2026-06-16 CHOP21 - Jun 16, 00:35 UTCJun 16, 00:50 UTC15m
2026-06-15 CHOP21 - Jun 15, 03:55 UTCJun 15, 04:10 UTC15m
2026-06-15 CHOP21 - Jun 15, 02:10 UTCJun 15, 02:20 UTC10m
2026-06-14 CHOP21 - Jun 14, 23:10 UTCJun 14, 23:25 UTC15m
2026-06-14 CHOP21 - Jun 14, 06:10 UTCJun 14, 06:25 UTC15m
2026-05-14 CHOP22 - May 14, 02:55 UTCMay 14, 04:00 UTC1h 5m
2026-05-14 CHOP22 - May 14, 01:30 UTCMay 14, 02:05 UTC35m
2026-05-11 CHOP41 - May 11, 03:55 UTCMay 11, 04:20 UTC25m
2026-05-11 CHOP41 - May 11, 02:50 UTCMay 11, 03:25 UTC35m
2026-05-06 CHOP41 - May 6, 05:00 UTCMay 6, 05:10 UTC10m
2026-05-06 CHOP41 - May 6, 03:40 UTCMay 6, 03:50 UTC10m
2026-05-05 CHOP41 - May 5, 05:50 UTCMay 5, 06:20 UTC30m
2026-04-28 CHOP41 - Apr 28, 03:00 UTCApr 28, 03:15 UTC15m
2026-04-28 CHOP41 - Apr 28, 02:00 UTCApr 28, 02:10 UTC10m
2026-04-23 CHOP41 - Apr 23, 08:25 UTCApr 23, 09:40 UTC1h 15m
2026-04-22 CHOP41 - Apr 22, 08:10 UTCApr 22, 09:55 UTC1h 45m
2026-04-21 CHOP41 - Apr 21, 08:00 UTCApr 21, 09:30 UTC1h 30m
2026-04-20 CHOP41 - Apr 20, 08:00 UTCApr 20, 10:10 UTC2h 10m
2026-04-18 CHOP41 - Apr 18, 07:45 UTCApr 18, 08:25 UTC40m
2026-04-18 CHOP41 - Apr 18, 07:20 UTCApr 18, 08:25 UTC1h 5m
2026-04-18 CHOP41 - Apr 18, 06:05 UTCApr 18, 06:30 UTC25m
2026-04-18 CHOP41 - Apr 18, 04:45 UTCApr 18, 05:05 UTC20m
2026-04-18 CHOP41 - Apr 18, 04:40 UTCApr 18, 05:05 UTC25m
2026-04-18 CHOP41 - Apr 18, 02:15 UTCApr 18, 02:40 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-SYZ page for operator, model, and routing details .

Mode-S 7C5E99 frequently asked

What is Mode-S code 7C5E99?
7C5E99 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-SYZ.
Where is Mode-S 7C5E99 registered?
Mode-S code 7C5E99 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C5E99 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 7C5E99, octal 37057231, decimal 8,150,681.
What flights does 7C5E99 operate?
Mode-S 7C5E99 has broadcast 3 distinct callsigns, including CHOP21, CHOP41, CHOP22.