Apparatus

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sensors Mode-S transponder

7C77D9

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-XYJ · BEECH 200 Super King Air · operated by ROYAL FLYING DOCTOR SERVICE OF AUSTRALIA (SOUTH EASTERN SECTION)

Hex
7C77D9
Octal
37073731
Decimal
8,157,145
Country
AU
Tail
VH-XYJ
Type
BE20
No current signal · last broadcast 4h ago
Flights observed
136
Distinct callsigns
15
Country
AU
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 7C77D9.

Country allocation

The ICAO 24-bit address 7C77D9 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 15 distinct

Callsign Airline Flights Last seen
FD213 - 18 2026-07-14
FD243 Thai AirAsia 17 2026-07-20
FD287 - 16 2026-07-19
FD238 - 15 2026-07-16
FD264 - 11 2026-06-12
FD218 - 10 2026-06-30
FD229 - 9 2026-06-19
FD212 - 9 2026-07-18
FD244 - 7 2026-07-13
FD236 - 6 2026-07-10
FD258 - 5 2026-05-18
FD234 Thai AirAsia 5 2026-06-08
FD231 Thai AirAsia 3 2026-06-05
FD221 - 3 2026-06-17
FD237 - 2 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 FD243 CTS → TPE Jul 20, 05:15 UTCJul 20, 05:25 UTC10m
2026-07-20 FD243 CTS → TPE Jul 20, 03:20 UTCJul 20, 03:45 UTC25m
2026-07-20 FD243 CTS → TPE Jul 20, 02:00 UTCJul 20, 02:40 UTC40m
2026-07-19 FD243 CTS → TPE Jul 19, 23:50 UTCJul 20, 00:15 UTC25m
2026-07-19 FD243 CTS → TPE Jul 19, 22:25 UTCJul 19, 23:35 UTC1h 10m
2026-07-19 FD287 - Jul 19, 04:35 UTCJul 19, 05:05 UTC30m
2026-07-19 FD287 - Jul 19, 03:15 UTCJul 19, 03:45 UTC30m
2026-07-19 FD287 - Jul 19, 01:10 UTCJul 19, 01:35 UTC25m
2026-07-18 FD287 - Jul 18, 23:40 UTCJul 19, 00:30 UTC50m
2026-07-18 FD212 - Jul 18, 04:15 UTCJul 18, 04:45 UTC30m
2026-07-18 FD212 - Jul 18, 02:14 UTCJul 18, 03:00 UTC46m
2026-07-17 FD212 - Jul 17, 23:14 UTCJul 17, 23:35 UTC20m
2026-07-17 FD212 - Jul 17, 06:35 UTCJul 17, 06:54 UTC20m
2026-07-16 FD212 - Jul 16, 22:35 UTCJul 16, 22:49 UTC15m
2026-07-16 FD238 - Jul 16, 05:20 UTCJul 16, 05:35 UTC15m
2026-07-15 FD237 - Jul 15, 00:55 UTCJul 15, 01:45 UTC50m
2026-07-14 FD237 - Jul 14, 23:15 UTCJul 15, 00:10 UTC55m
2026-07-14 FD213 - Jul 14, 00:10 UTCJul 14, 00:50 UTC40m
2026-07-13 FD213 - Jul 13, 22:25 UTCJul 13, 23:10 UTC45m
2026-07-13 FD244 - Jul 13, 03:40 UTCJul 13, 04:15 UTC35m
2026-07-13 FD244 - Jul 13, 01:45 UTCJul 13, 02:20 UTC35m
2026-07-12 FD244 - Jul 12, 23:00 UTCJul 12, 23:15 UTC15m
2026-07-12 FD243 - Jul 12, 03:20 UTCJul 12, 03:50 UTC30m
2026-07-11 FD287 - Jul 11, 05:01 UTCJul 11, 05:35 UTC35m
2026-07-11 FD287 - Jul 11, 03:45 UTCJul 11, 04:55 UTC1h 10m
2026-07-11 FD287 - Jul 11, 01:40 UTCJul 11, 02:05 UTC25m
2026-07-10 FD236 - Jul 10, 00:55 UTCJul 10, 01:30 UTC35m
2026-07-09 FD236 - Jul 9, 23:15 UTCJul 10, 00:00 UTC45m
2026-07-09 FD236 - Jul 9, 05:10 UTCJul 9, 05:35 UTC25m
2026-07-09 FD236 - Jul 9, 03:30 UTCJul 9, 04:15 UTC45m
2026-07-09 FD236 - Jul 9, 01:00 UTCJul 9, 01:20 UTC20m
2026-07-08 FD236 - Jul 8, 23:15 UTCJul 8, 23:25 UTC10m
2026-07-03 FD212 - Jul 3, 06:30 UTCJul 3, 06:55 UTC25m
2026-07-02 FD212 - Jul 2, 22:25 UTCJul 2, 22:45 UTC20m
2026-06-30 FD218 - Jun 30, 06:20 UTCJun 30, 06:30 UTC10m
2026-06-29 FD218 - Jun 29, 22:35 UTCJun 29, 22:44 UTC10m
2026-06-29 FD238 - Jun 29, 05:54 UTCJun 29, 06:14 UTC20m
2026-06-21 FD238 - Jun 21, 23:00 UTCJun 22, 00:40 UTC1h 40m
2026-06-21 FD243 - Jun 21, 04:44 UTCJun 21, 05:25 UTC40m
2026-06-21 FD243 - Jun 21, 03:40 UTCJun 21, 04:39 UTC1h 0m
2026-06-21 FD243 - Jun 21, 01:39 UTCJun 21, 02:04 UTC25m
2026-06-21 FD243 - Jun 21, 00:29 UTCJun 21, 00:59 UTC30m
2026-06-20 FD243 - Jun 20, 05:19 UTCJun 20, 05:59 UTC40m
2026-06-20 FD243 - Jun 20, 03:49 UTCJun 20, 04:29 UTC40m
2026-06-19 FD229 - Jun 19, 04:44 UTCJun 19, 05:30 UTC45m
2026-06-19 FD229 - Jun 19, 03:39 UTCJun 19, 04:10 UTC30m
2026-06-19 FD229 - Jun 19, 00:49 UTCJun 19, 01:34 UTC45m
2026-06-18 FD229 - Jun 18, 23:25 UTCJun 19, 00:00 UTC35m
2026-06-18 FD229 - Jun 18, 02:20 UTCJun 18, 03:00 UTC40m
2026-06-18 FD229 - Jun 18, 00:50 UTCJun 18, 01:35 UTC45m

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

Mode-S 7C77D9 frequently asked

What is Mode-S code 7C77D9?
7C77D9 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-XYJ.
Where is Mode-S 7C77D9 registered?
Mode-S code 7C77D9 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C77D9 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C77D9, octal 37073731, decimal 8,157,145.
What flights does 7C77D9 operate?
Mode-S 7C77D9 has broadcast 15 distinct callsigns, including FD213, FD243, FD287, FD238, FD264.