Apparatus

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sensors Mode-S transponder

7C1B2B

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-FNH · PILATUS PC-12 · operated by ROYAL FLYING DOCTOR SERVICE OF AUSTRALIA CENTRAL OPERATIONS

Hex
7C1B2B
Octal
37015453
Decimal
8,133,419
Country
AU
Tail
VH-FNH
Type
PC12
No current signal · last broadcast 16h ago
Flights observed
238
Distinct callsigns
20
Country
AU
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S 7C1B2B.

Country allocation

The ICAO 24-bit address 7C1B2B 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
FD514 - 25 2026-05-27
FD521 - 20 2026-05-24
FD534 - 17 2026-05-23
FD531 Thai AirAsia 16 2026-05-25
FD540 - 15 2026-05-12
FD526 - 15 2026-04-22
FD518 Thai AirAsia 15 2026-05-26
FD535 - 13 2026-05-29
FD527 - 13 2026-05-26
FD542 - 9 2026-04-21
FD567 Thai AirAsia 8 2026-04-23
FD513 Thai AirAsia 8 2026-05-27
FD580 - 6 2026-05-13
FD572 Thai AirAsia 6 2026-04-28
FD528 - 6 2026-04-17
FD575 - 5 2026-04-29
FD532 Thai AirAsia 5 2026-05-20
FD515 Thai AirAsia 5 2026-05-23
FD538 - 4 2026-05-02
FD524 - 4 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 FD535 - May 29, 08:25 UTCMay 29, 08:55 UTC30m
2026-05-29 FD535 - May 29, 05:15 UTCMay 29, 05:45 UTC30m
2026-05-29 FD535 - May 29, 03:15 UTCMay 29, 03:45 UTC30m
2026-05-29 FD535 - May 29, 02:10 UTCMay 29, 02:40 UTC30m
2026-05-29 FD535 - May 29, 01:10 UTCMay 29, 01:55 UTC45m
2026-05-27 FD513 JHB → DMK May 27, 16:35 UTCMay 27, 17:45 UTC1h 10m
2026-05-27 FD513 JHB → DMK May 27, 13:50 UTCMay 27, 14:30 UTC40m
2026-05-27 FD513 JHB → DMK May 27, 12:15 UTCMay 27, 12:25 UTC10m
2026-05-27 FD513 JHB → DMK May 27, 10:50 UTCMay 27, 11:30 UTC40m
2026-05-27 FD514 - May 27, 04:14 UTCMay 27, 04:55 UTC40m
2026-05-26 FD527 - May 26, 18:14 UTCMay 26, 18:45 UTC30m
2026-05-26 FD527 - May 26, 16:55 UTCMay 26, 17:20 UTC25m
2026-05-26 FD527 - May 26, 12:45 UTCMay 26, 13:24 UTC40m
2026-05-26 FD527 - May 26, 10:14 UTCMay 26, 10:54 UTC40m
2026-05-26 FD518 DMK → HKG May 26, 07:29 UTCMay 26, 08:04 UTC35m
2026-05-26 FD518 DMK → HKG May 26, 05:25 UTCMay 26, 06:04 UTC40m
2026-05-26 FD518 DMK → HKG May 26, 04:00 UTCMay 26, 04:35 UTC35m
2026-05-26 FD518 DMK → HKG May 26, 00:19 UTCMay 26, 01:00 UTC40m
2026-05-25 FD531 CAN → DMK May 25, 16:45 UTCMay 25, 17:10 UTC25m
2026-05-25 FD531 CAN → DMK May 25, 15:15 UTCMay 25, 15:40 UTC25m
2026-05-25 FD531 CAN → DMK May 25, 13:35 UTCMay 25, 14:00 UTC25m
2026-05-25 FD531 CAN → DMK May 25, 12:30 UTCMay 25, 12:50 UTC20m
2026-05-25 FD527 - May 25, 06:15 UTCMay 25, 07:10 UTC55m
2026-05-25 FD527 - May 25, 04:20 UTCMay 25, 05:00 UTC40m
2026-05-25 FD527 - May 25, 02:15 UTCMay 25, 02:50 UTC35m
2026-05-24 FD521 - May 24, 08:40 UTCMay 24, 09:15 UTC35m
2026-05-24 FD521 - May 24, 05:55 UTCMay 24, 06:45 UTC50m
2026-05-24 FD521 - May 24, 04:15 UTCMay 24, 04:50 UTC35m
2026-05-24 FD521 - May 24, 02:35 UTCMay 24, 03:20 UTC45m
2026-05-23 FD534 - May 23, 17:45 UTCMay 23, 18:15 UTC31m
2026-05-23 FD534 - May 23, 14:15 UTCMay 23, 15:00 UTC45m
2026-05-23 FD534 - May 23, 13:00 UTCMay 23, 13:25 UTC25m
2026-05-23 FD534 - May 23, 11:10 UTCMay 23, 11:35 UTC25m
2026-05-23 FD515 CNX → HKG May 23, 05:05 UTCMay 23, 05:40 UTC35m
2026-05-23 FD515 CNX → HKG May 23, 02:40 UTCMay 23, 03:35 UTC55m
2026-05-22 FD514 - May 22, 19:35 UTCMay 22, 20:10 UTC35m
2026-05-22 FD514 - May 22, 18:15 UTCMay 22, 18:50 UTC35m
2026-05-22 FD514 - May 22, 15:55 UTCMay 22, 17:00 UTC1h 5m
2026-05-22 FD514 - May 22, 14:25 UTCMay 22, 15:15 UTC50m
2026-05-22 FD514 - May 22, 12:45 UTCMay 22, 13:05 UTC20m
2026-05-22 FD514 - May 22, 10:15 UTCMay 22, 11:00 UTC45m
2026-05-20 FD532 DMK → CAN May 20, 10:10 UTCMay 20, 10:30 UTC20m
2026-05-20 FD532 DMK → CAN May 20, 08:40 UTCMay 20, 09:25 UTC45m
2026-05-20 FD532 DMK → CAN May 20, 07:05 UTCMay 20, 08:00 UTC55m
2026-05-20 FD532 DMK → CAN May 20, 02:45 UTCMay 20, 03:20 UTC35m
2026-05-20 FD532 DMK → CAN May 20, 00:50 UTCMay 20, 01:20 UTC30m
2026-05-18 FD531 CAN → DMK May 18, 18:50 UTCMay 18, 19:45 UTC55m
2026-05-18 FD531 CAN → DMK May 18, 17:15 UTCMay 18, 18:10 UTC55m
2026-05-18 FD531 CAN → DMK May 18, 14:55 UTCMay 18, 16:30 UTC1h 35m
2026-05-18 FD531 CAN → DMK May 18, 10:55 UTCMay 18, 12:20 UTC1h 25m

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

Mode-S 7C1B2B frequently asked

What is Mode-S code 7C1B2B?
7C1B2B is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-FNH.
Where is Mode-S 7C1B2B registered?
Mode-S code 7C1B2B is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C1B2B broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C1B2B, octal 37015453, decimal 8,133,419.
What flights does 7C1B2B operate?
Mode-S 7C1B2B has broadcast 20 distinct callsigns, including FD514, FD521, FD534, FD531, FD540.