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sensors Mode-S transponder

7C1C99

ICAO 24-bit transponder address · allocated to Australia

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

Hex
7C1C99
Octal
37016231
Decimal
8,133,785
Country
AU
Tail
VH-FXN
Type
PC12
Broadcasting now · callsign FD532 · 23,000 ft
Flights observed
451
Distinct callsigns
20
Country
AU
Last broadcast
Jul 26, 12:00 UTC

Current position

7C1C99 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 7C1C99 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
FD522 - 40 2026-07-07
FD515 Thai AirAsia 37 2026-07-26
FD516 Thai AirAsia 25 2026-07-18
FD526 - 22 2026-07-19
FD532 - 19 2026-07-05
FD535 - 18 2026-06-24
FD524 - 17 2026-07-24
FD521 - 16 2026-07-19
FD513 Thai AirAsia 16 2026-07-22
FD574 - 15 2026-07-22
FD542 - 15 2026-05-30
FD540 - 15 2026-05-26
FD528 - 15 2026-07-23
FD583 - 14 2026-06-29
FD514 - 14 2026-07-25
FD567 Thai AirAsia 13 2026-06-02
FD575 - 12 2026-06-22
FD527 - 12 2026-07-20
FD518 Thai AirAsia 12 2026-06-13
FD517 Thai AirAsia 12 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FD515 CNX → HKG Jul 26, 11:25 UTCJul 26, 12:00 UTC35m
2026-07-26 FD515 CNX → HKG Jul 26, 08:20 UTCJul 26, 09:00 UTC40m
2026-07-26 FD515 CNX → HKG Jul 26, 06:55 UTCJul 26, 07:10 UTC15m
2026-07-26 FD515 CNX → HKG Jul 26, 05:35 UTCJul 26, 05:50 UTC15m
2026-07-25 FD514 - Jul 25, 14:05 UTCJul 25, 14:35 UTC30m
2026-07-25 FD514 - Jul 25, 12:50 UTCJul 25, 13:15 UTC25m
2026-07-25 FD525 - Jul 25, 05:35 UTCJul 25, 06:05 UTC30m
2026-07-25 FD525 - Jul 25, 03:15 UTCJul 25, 03:40 UTC25m
2026-07-24 FD524 - Jul 24, 13:10 UTCJul 24, 13:35 UTC25m
2026-07-24 FD524 - Jul 24, 12:00 UTCJul 24, 12:15 UTC15m
2026-07-24 FD580 - Jul 24, 09:40 UTCJul 24, 10:10 UTC30m
2026-07-24 FD580 - Jul 24, 07:50 UTCJul 24, 08:15 UTC25m
2026-07-24 FD580 - Jul 24, 03:55 UTCJul 24, 04:45 UTC50m
2026-07-24 FD580 - Jul 24, 00:45 UTCJul 24, 01:35 UTC50m
2026-07-23 FD528 - Jul 23, 19:05 UTCJul 23, 19:50 UTC45m
2026-07-23 FD528 - Jul 23, 14:55 UTCJul 23, 15:35 UTC40m
2026-07-23 FD524 - Jul 23, 09:10 UTCJul 23, 09:40 UTC30m
2026-07-23 FD524 - Jul 23, 07:25 UTCJul 23, 07:50 UTC25m
2026-07-23 FD524 - Jul 23, 05:20 UTCJul 23, 05:55 UTC35m
2026-07-23 FD524 - Jul 23, 02:20 UTCJul 23, 02:50 UTC30m
2026-07-22 FD513 JHB → DMK Jul 22, 11:35 UTCJul 22, 12:55 UTC1h 20m
2026-07-22 FD574 - Jul 22, 03:40 UTCJul 22, 04:40 UTC1h 0m
2026-07-22 FD574 - Jul 22, 02:15 UTCJul 22, 03:00 UTC45m
2026-07-22 FD574 - Jul 22, 00:00 UTCJul 22, 00:35 UTC35m
2026-07-21 FD574 ADL → PLO Jul 21, 21:35 UTCJul 21, 22:20 UTC45m
2026-07-21 FD517 HKG → DMK Jul 21, 07:05 UTCJul 21, 08:05 UTC1h 0m
2026-07-21 FD517 HKG → DMK Jul 21, 05:25 UTCJul 21, 06:10 UTC45m
2026-07-21 FD517 HKG → DMK Jul 21, 03:35 UTCJul 21, 04:10 UTC35m
2026-07-21 FD517 HKG → DMK Jul 21, 01:15 UTCJul 21, 01:30 UTC15m
2026-07-21 FD517 HKG → DMK Jul 21, 00:15 UTCJul 21, 00:45 UTC30m
2026-07-20 FD517 HKG → DMK Jul 20, 23:20 UTCJul 20, 23:40 UTC20m
2026-07-20 FD527 - Jul 20, 08:40 UTCJul 20, 09:45 UTC1h 5m
2026-07-20 FD527 - Jul 20, 05:45 UTCJul 20, 06:35 UTC50m
2026-07-20 FD527 - Jul 20, 03:50 UTCJul 20, 04:25 UTC35m
2026-07-20 FD527 - Jul 20, 01:05 UTCJul 20, 01:55 UTC50m
2026-07-19 FD526 - Jul 19, 19:10 UTCJul 19, 20:20 UTC1h 10m
2026-07-19 FD526 - Jul 19, 17:50 UTCJul 19, 18:30 UTC40m
2026-07-19 FD526 - Jul 19, 15:10 UTCJul 19, 16:10 UTC1h 0m
2026-07-19 FD526 - Jul 19, 14:25 UTCJul 19, 14:40 UTC15m
2026-07-19 FD526 - Jul 19, 10:45 UTCJul 19, 11:35 UTC50m
2026-07-19 FD521 - Jul 19, 07:25 UTCJul 19, 08:25 UTC1h 0m
2026-07-19 FD521 - Jul 19, 05:30 UTCJul 19, 06:20 UTC50m
2026-07-19 FD521 - Jul 19, 02:55 UTCJul 19, 04:00 UTC1h 5m
2026-07-19 FD521 ADL → MGB Jul 19, 01:10 UTCJul 19, 02:10 UTC1h 0m
2026-07-18 FD516 HKG → CNX Jul 18, 08:35 UTCJul 18, 09:05 UTC30m
2026-07-18 FD516 HKG → CNX Jul 18, 07:35 UTCJul 18, 07:45 UTC10m
2026-07-18 FD516 HKG → CNX Jul 18, 06:30 UTCJul 18, 07:05 UTC35m
2026-07-18 FD516 HKG → CNX Jul 18, 04:40 UTCJul 18, 05:15 UTC35m
2026-07-18 FD516 HKG → CNX Jul 18, 01:00 UTCJul 18, 01:34 UTC35m
2026-07-17 FD514 ADL → ADL Jul 17, 19:05 UTCJul 17, 20:25 UTC1h 20m

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

Mode-S 7C1C99 frequently asked

What is Mode-S code 7C1C99?
7C1C99 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-FXN.
Where is Mode-S 7C1C99 registered?
Mode-S code 7C1C99 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C1C99 broadcasting right now?
Yes. Mode-S 7C1C99 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C1C99, octal 37016231, decimal 8,133,785.
What flights does 7C1C99 operate?
Mode-S 7C1C99 has broadcast 20 distinct callsigns, including FD522, FD515, FD516, FD526, FD532.