Apparatus

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sensors Mode-S transponder

7C7F31

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-ZER · CESSNA 172 Skyhawk · operated by AIRFLITE PTY LTD

Hex
7C7F31
Octal
37077461
Decimal
8,159,025
Country
AU
Tail
VH-ZER
Type
C172
No current signal · last broadcast Jul 24, 01:55 UTC
Flights observed
150
Distinct callsigns
1
Country
AU
Last broadcast
Jul 24, 01:55 UTC

Last known position

Most recent position reported by Mode-S 7C7F31.

Country allocation

The ICAO 24-bit address 7C7F31 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
ZER - 150 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 ZER JAD → JAD Jul 24, 01:05 UTCJul 24, 01:55 UTC50m
2026-07-23 ZER JAD → JAD Jul 23, 01:55 UTCJul 23, 03:15 UTC1h 20m
2026-07-23 ZER JAD → JAD Jul 23, 00:15 UTCJul 23, 01:50 UTC1h 35m
2026-07-22 ZER - Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-21 ZER JAD → JAD Jul 21, 11:15 UTCJul 21, 12:45 UTC1h 30m
2026-07-21 ZER JAD → JAD Jul 21, 07:05 UTCJul 21, 08:15 UTC1h 10m
2026-07-20 ZER - Jul 20, 07:55 UTCJul 20, 09:00 UTC1h 5m
2026-07-20 ZER - Jul 20, 06:20 UTCJul 20, 06:55 UTC35m
2026-07-15 ZER JAD → JAD Jul 15, 11:40 UTCJul 15, 12:35 UTC55m
2026-07-15 ZER - Jul 15, 07:50 UTCJul 15, 08:15 UTC25m
2026-07-15 ZER - Jul 15, 05:30 UTCJul 15, 06:05 UTC35m
2026-07-15 ZER JAD → JAD Jul 15, 01:15 UTCJul 15, 02:40 UTC1h 25m
2026-07-14 ZER JAD → JAD Jul 14, 07:50 UTCJul 14, 09:20 UTC1h 30m
2026-07-14 ZER JAD → JAD Jul 14, 05:50 UTCJul 14, 07:10 UTC1h 20m
2026-07-14 ZER JAD → JAD Jul 14, 03:10 UTCJul 14, 04:25 UTC1h 15m
2026-07-14 ZER - Jul 14, 01:10 UTCJul 14, 02:25 UTC1h 15m
2026-07-13 ZER - Jul 13, 08:05 UTCJul 13, 08:45 UTC40m
2026-07-13 ZER - Jul 13, 05:55 UTCJul 13, 07:01 UTC1h 5m
2026-07-12 ZER - Jul 12, 08:01 UTCJul 12, 09:00 UTC1h 0m
2026-07-12 ZER - Jul 12, 04:20 UTCJul 12, 05:05 UTC45m
2026-07-09 ZER - Jul 9, 06:05 UTCJul 9, 06:35 UTC30m
2026-07-09 ZER - Jul 9, 03:55 UTCJul 9, 04:25 UTC30m
2026-07-09 ZER JAD → JAD Jul 9, 01:15 UTCJul 9, 01:25 UTC10m
2026-07-09 ZER JAD → JAD Jul 9, 00:25 UTCJul 9, 01:10 UTC45m
2026-07-08 ZER - Jul 8, 07:20 UTCJul 8, 08:00 UTC40m
2026-07-08 ZER - Jul 8, 05:45 UTCJul 8, 06:05 UTC20m
2026-07-08 ZER - Jul 8, 03:25 UTCJul 8, 04:20 UTC55m
2026-07-08 ZER - Jul 8, 02:05 UTCJul 8, 02:50 UTC45m
2026-07-07 ZER - Jul 7, 07:40 UTCJul 7, 08:30 UTC50m
2026-07-07 ZER JAD → JAD Jul 7, 05:20 UTCJul 7, 06:15 UTC55m
2026-07-06 ZER JAD → JAD Jul 6, 03:40 UTCJul 6, 04:30 UTC50m
2026-07-06 ZER JAD → JAD Jul 6, 01:50 UTCJul 6, 02:35 UTC45m
2026-07-03 ZER - Jul 3, 06:40 UTCJul 3, 08:25 UTC1h 45m
2026-07-02 ZER - Jul 2, 06:55 UTCJul 2, 09:05 UTC2h 10m
2026-07-02 ZER - Jul 2, 03:35 UTCJul 2, 03:55 UTC20m
2026-07-02 ZER - Jul 2, 01:40 UTCJul 2, 02:05 UTC25m
2026-07-01 ZER JAD → JAD Jul 1, 01:05 UTCJul 1, 01:50 UTC45m
2026-06-29 ZER JAD → JAD Jun 29, 02:39 UTCJun 29, 03:29 UTC50m
2026-06-25 ZER - Jun 25, 08:20 UTCJun 25, 09:20 UTC1h 0m
2026-06-25 ZER - Jun 25, 06:40 UTCJun 25, 07:05 UTC25m
2026-06-25 ZER JAD → JAD Jun 25, 01:04 UTCJun 25, 01:54 UTC50m
2026-06-24 ZER JAD → JAD Jun 24, 05:05 UTCJun 24, 07:20 UTC2h 15m
2026-06-23 ZER JAD → JAD Jun 23, 06:19 UTCJun 23, 07:15 UTC55m
2026-06-23 ZER JAD → JAD Jun 23, 01:04 UTCJun 23, 01:54 UTC50m
2026-06-22 ZER - Jun 22, 04:15 UTCJun 22, 05:04 UTC50m
2026-06-22 ZER JAD → JAD Jun 22, 03:19 UTCJun 22, 04:09 UTC50m
2026-06-19 ZER JAD → JAD Jun 19, 06:14 UTCJun 19, 07:29 UTC1h 15m
2026-06-18 ZER BUY → JAD Jun 18, 07:55 UTCJun 18, 09:00 UTC1h 5m
2026-06-18 ZER JAD → BUY Jun 18, 06:00 UTCJun 18, 06:55 UTC55m
2026-06-17 ZER JAD → JAD Jun 17, 05:40 UTCJun 17, 06:50 UTC1h 10m

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

Mode-S 7C7F31 frequently asked

What is Mode-S code 7C7F31?
7C7F31 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-ZER.
Where is Mode-S 7C7F31 registered?
Mode-S code 7C7F31 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C7F31 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 01:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C7F31, octal 37077461, decimal 8,159,025.
What flights does 7C7F31 operate?
Mode-S 7C7F31 has broadcast 1 distinct callsign, including ZER.