Apparatus

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sensors Mode-S transponder

7800A9

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-2099 · BOEING 777-300ER

Hex
7800A9
Octal
36000251
Decimal
7,864,489
Country
CN
Tail
B-2099
Type
B77W
No current signal · last broadcast 8h ago
Flights observed
109
Distinct callsigns
20
Country
CN
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 7800A9.

Country allocation

The ICAO 24-bit address 7800A9 falls within the block assigned to China (CN) by ICAO Annex 10, Volume III. Every aircraft registered in China 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
CSN3095 China Southern Airlines 26 2026-05-31
CSN385 - 9 2026-07-09
CSN3096 China Southern Airlines 9 2026-05-31
CSN386 - 5 2026-07-12
CSN313 China Southern Airlines 5 2026-05-29
CSN3098 China Southern Airlines 5 2026-07-20
CSN3097 China Southern Airlines 5 2026-07-20
CSN659 - 4 2026-07-20
CSN347 - 4 2026-07-19
CSN328 - 4 2026-07-11
CSN327 - 4 2026-07-10
CSN303 China Southern Airlines 4 2026-04-29
CSN660 China Southern Airlines 3 2026-05-05
CSN5795 China Southern Airlines 3 2026-07-18
CSN348 - 3 2026-07-19
CSN329 China Southern Airlines 3 2026-05-08
CSN304 China Southern Airlines 3 2026-04-29
CSN330 China Southern Airlines 2 2026-05-09
CSN314 China Southern Airlines 2 2026-05-28
CSN6981 - 1 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 CSN659 - Jul 20, 17:50 UTCJul 20, 19:30 UTC1h 40m
2026-07-20 CSN3098 TPE → CAN Jul 20, 07:35 UTCJul 20, 08:50 UTC1h 15m
2026-07-20 CSN3097 CAN → TPE Jul 20, 04:35 UTCJul 20, 06:10 UTC1h 35m
2026-07-19 CSN348 - Jul 19, 10:25 UTCJul 19, 16:50 UTC6h 25m
2026-07-19 CSN347 - Jul 19, 00:40 UTCJul 19, 04:50 UTC4h 10m
2026-07-18 CSN5795 SZX → URC Jul 18, 01:34 UTCJul 18, 01:45 UTC10m
2026-07-17 CSN5795 - Jul 17, 01:39 UTCJul 17, 01:55 UTC15m
2026-07-15 CSN5795 - Jul 15, 01:55 UTCJul 15, 02:05 UTC10m
2026-07-14 CSN3564 - Jul 14, 13:45 UTCJul 14, 14:00 UTC15m
2026-07-14 CSN3563 - Jul 14, 09:00 UTCJul 14, 09:10 UTC10m
2026-07-12 CSN386 - Jul 12, 06:55 UTCJul 12, 08:15 UTC1h 20m
2026-07-11 CSN328 - Jul 11, 16:55 UTCJul 12, 04:45 UTC11h 50m
2026-07-11 CSN328 - Jul 11, 07:10 UTCJul 12, 04:45 UTC21h 35m
2026-07-10 CSN327 - Jul 10, 16:20 UTCJul 11, 03:15 UTC10h 55m
2026-07-10 CSN3098 - Jul 10, 07:05 UTCJul 10, 08:20 UTC1h 15m
2026-07-10 CSN3097 - Jul 10, 03:45 UTCJul 10, 05:05 UTC1h 20m
2026-07-09 CSN386 - Jul 9, 07:00 UTCJul 9, 08:25 UTC1h 25m
2026-07-09 CSN385 - Jul 9, 03:40 UTCJul 9, 05:25 UTC1h 45m
2026-07-08 CSN3098 - Jul 8, 08:40 UTCJul 8, 09:40 UTC1h 0m
2026-07-08 CSN3097 - Jul 8, 05:45 UTCJul 8, 07:15 UTC1h 30m
2026-07-07 CSN328 - Jul 7, 07:00 UTCJul 7, 18:40 UTC11h 40m
2026-07-06 CSN327 - Jul 6, 08:20 UTCJul 7, 02:40 UTC18h 20m
2026-07-06 CSN327 - Jul 6, 07:00 UTCJul 7, 02:40 UTC19h 40m
2026-07-05 CSN385 - Jul 5, 18:20 UTCJul 6, 04:50 UTC10h 30m
2026-07-05 CSN385 - Jul 5, 08:35 UTCJul 6, 04:50 UTC20h 15m
2026-07-05 CSN385 - Jul 5, 06:20 UTCJul 6, 04:50 UTC22h 30m
2026-07-05 CSN312 - Jul 5, 06:05 UTCJul 6, 04:15 UTC22h 10m
2026-07-04 CSN311 - Jul 4, 15:05 UTCJul 5, 03:30 UTC12h 25m
2026-06-27 CSN6981 - Jun 27, 06:59 UTCJun 27, 07:10 UTC10m
2026-06-13 CSN3098 - Jun 13, 08:35 UTCJun 13, 09:05 UTC30m
2026-06-13 CSN3097 - Jun 13, 05:40 UTCJun 13, 07:05 UTC1h 25m
2026-06-12 CSN3098 TPE → CAN Jun 12, 07:35 UTCJun 12, 08:00 UTC25m
2026-06-12 CSN3097 - Jun 12, 03:55 UTCJun 12, 05:15 UTC1h 20m
2026-06-11 CSN3526 - Jun 11, 10:50 UTCJun 11, 11:00 UTC10m
2026-06-10 CSN386 HND → CAN Jun 10, 06:50 UTCJun 10, 08:15 UTC1h 25m
2026-06-10 CSN385 CAN → HND Jun 10, 04:05 UTCJun 10, 05:10 UTC1h 5m
2026-06-02 CSN386 HND → CAN Jun 2, 08:05 UTCJun 2, 09:05 UTC1h 0m
2026-06-02 CSN385 CAN → HND Jun 2, 03:50 UTCJun 2, 05:10 UTC1h 20m
2026-05-31 CSN3096 TPE → PVG May 31, 10:50 UTCMay 31, 11:20 UTC30m
2026-05-31 CSN3095 PVG → TPE May 31, 08:30 UTCMay 31, 09:10 UTC40m
2026-05-30 CSN3095 PVG → TPE May 30, 11:05 UTCMay 31, 09:10 UTC22h 5m
2026-05-30 CSN3095 PVG → TPE May 30, 04:25 UTCMay 30, 09:25 UTC5h 0m
2026-05-29 CSN313 PVG → ICN May 29, 11:20 UTCMay 30, 02:15 UTC14h 55m
2026-05-29 CSN3095 PVG → TPE May 29, 04:40 UTCMay 29, 09:20 UTC4h 40m
2026-05-28 CSN313 PVG → ICN May 28, 11:00 UTCMay 29, 02:25 UTC15h 25m
2026-05-28 CSN3095 PVG → TPE May 28, 08:45 UTCMay 28, 09:20 UTC35m
2026-05-28 CSN314 ICN → PVG May 28, 04:40 UTCMay 28, 04:55 UTC15m
2026-05-27 CSN313 PVG → ICN May 27, 11:25 UTCMay 28, 02:05 UTC14h 40m
2026-05-27 CSN3095 PVG → TPE May 27, 08:40 UTCMay 27, 09:10 UTC30m
2026-05-27 CSN314 ICN → PVG May 27, 04:24 UTCMay 27, 04:49 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 B-2099 page for operator, model, and routing details .

Mode-S 7800A9 frequently asked

What is Mode-S code 7800A9?
7800A9 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-2099.
Where is Mode-S 7800A9 registered?
Mode-S code 7800A9 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7800A9 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7800A9, octal 36000251, decimal 7,864,489.
What flights does 7800A9 operate?
Mode-S 7800A9 has broadcast 20 distinct callsigns, including CSN3095, CSN385, CSN3096, CSN386, CSN313.