Apparatus

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sensors Mode-S transponder

7823C9

ICAO 24-bit transponder address · allocated to China

Hex
7823C9
Octal
36021711
Decimal
7,873,481
Country
CN
No current signal · last broadcast 26d ago
Flights observed
200
Distinct callsigns
20
Country
CN
Last broadcast
26d ago

Last known position

Most recent position reported by Mode-S 7823C9.

Country allocation

The ICAO 24-bit address 7823C9 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
CSN3369 China Southern Airlines 6 2026-07-22
CSN3171 - 6 2026-07-11
CSN3370 China Southern Airlines 5 2026-07-22
CSN8492 - 4 2026-07-08
CSN8491 - 4 2026-07-08
CSN5861 - 4 2026-07-17
CSN5845 - 4 2026-07-15
CSN3964 - 4 2026-07-10
CSN3911 China Southern Airlines 4 2026-07-25
CSN3613 - 4 2026-07-04
CSN3176 - 4 2026-07-12
CSN8575 - 3 2026-07-09
CSN8495 - 3 2026-07-20
CSN6923 - 3 2026-06-20
CSN6850 - 3 2026-07-08
CSN5846 - 3 2026-07-16
CSN3912 China Southern Airlines 3 2026-07-26
CSN3576 - 3 2026-07-13
CSN3351 - 3 2026-07-18
CSN3210 - 3 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN3912 WUH → SZX Jul 26, 17:00 UTCJul 26, 17:15 UTC15m
2026-07-25 CSN3911 SZX → WUH Jul 25, 00:30 UTCJul 25, 00:45 UTC15m
2026-07-24 CSN3912 WUH → SZX Jul 24, 15:30 UTCJul 24, 15:40 UTC10m
2026-07-24 CSN3911 SZX → WUH Jul 24, 00:15 UTCJul 24, 00:30 UTC15m
2026-07-23 CSN3911 SZX → WUH Jul 23, 00:25 UTCJul 23, 00:45 UTC20m
2026-07-22 CSN3370 CGQ → SZX Jul 22, 12:35 UTCJul 22, 13:25 UTC50m
2026-07-22 CSN3369 SZX → CGQ Jul 22, 03:55 UTCJul 22, 04:05 UTC10m
2026-07-21 CSN8283 SZX → HET Jul 21, 12:50 UTCJul 21, 13:00 UTC10m
2026-07-21 CSN5819 - Jul 21, 02:15 UTCJul 21, 02:25 UTC10m
2026-07-20 CSN6498 SYX → SZX Jul 20, 17:50 UTCJul 20, 18:05 UTC15m
2026-07-20 CSN6497 SZX → SYX Jul 20, 12:35 UTCJul 20, 12:50 UTC15m
2026-07-20 CSN8495 - Jul 20, 04:30 UTCJul 20, 04:45 UTC15m
2026-07-20 CSN3578 NKG → SZX Jul 20, 02:50 UTCJul 20, 03:10 UTC20m
2026-07-19 CSN3577 - Jul 19, 13:40 UTCJul 19, 13:50 UTC10m
2026-07-19 CSN3451 - Jul 19, 06:10 UTCJul 19, 06:30 UTC20m
2026-07-18 CSN3351 - Jul 18, 23:25 UTCJul 18, 23:35 UTC10m
2026-07-18 CSN3154 - Jul 18, 15:15 UTCJul 18, 15:25 UTC10m
2026-07-18 CSN3167 - Jul 18, 06:30 UTCJul 18, 06:40 UTC10m
2026-07-18 CSN5862 - Jul 18, 04:50 UTCJul 18, 05:00 UTC10m
2026-07-17 CSN5861 - Jul 17, 23:39 UTCJul 17, 23:55 UTC15m
2026-07-17 CSN3210 - Jul 17, 12:55 UTCJul 17, 13:40 UTC45m
2026-07-17 CSN6922 - Jul 17, 06:10 UTCJul 17, 06:20 UTC10m
2026-07-17 CSN6921 - Jul 17, 01:25 UTCJul 17, 01:35 UTC10m
2026-07-16 CSN6498 - Jul 16, 17:40 UTCJul 16, 17:49 UTC10m
2026-07-16 CSN8495 - Jul 16, 04:45 UTCJul 16, 04:55 UTC10m
2026-07-16 CSN5846 - Jul 16, 02:30 UTCJul 16, 02:40 UTC10m
2026-07-15 CSN5845 - Jul 15, 13:00 UTCJul 15, 13:15 UTC15m
2026-07-15 CSN3552 - Jul 15, 10:25 UTCJul 15, 11:10 UTC45m
2026-07-15 CSN3551 - Jul 15, 05:25 UTCJul 15, 05:35 UTC10m
2026-07-15 CSN5846 - Jul 15, 02:50 UTCJul 15, 03:10 UTC20m
2026-07-14 CSN5845 - Jul 14, 12:45 UTCJul 14, 13:00 UTC15m
2026-07-14 CSN3552 - Jul 14, 09:15 UTCJul 14, 10:05 UTC50m
2026-07-14 CSN3551 - Jul 14, 04:50 UTCJul 14, 05:00 UTC10m
2026-07-13 CSN3626 - Jul 13, 07:30 UTCJul 13, 12:10 UTC4h 40m
2026-07-13 CSN3576 - Jul 13, 03:15 UTCJul 13, 04:10 UTC55m
2026-07-12 CSN3568 - Jul 12, 22:50 UTCJul 12, 23:00 UTC10m
2026-07-12 CSN5919 - Jul 12, 09:35 UTCJul 12, 09:50 UTC15m
2026-07-12 CSN3176 - Jul 12, 06:45 UTCJul 12, 06:55 UTC10m
2026-07-11 CSN3171 - Jul 11, 23:55 UTCJul 12, 00:05 UTC10m
2026-07-11 CSN3912 - Jul 11, 15:45 UTCJul 11, 15:55 UTC10m
2026-07-11 CSN3911 - Jul 11, 00:40 UTCJul 11, 01:00 UTC20m
2026-07-10 CSN3964 - Jul 10, 15:40 UTCJul 10, 16:20 UTC40m
2026-07-10 CSN3171 - Jul 10, 00:00 UTCJul 10, 00:10 UTC10m
2026-07-09 CSN8575 - Jul 9, 09:05 UTCJul 9, 09:15 UTC10m
2026-07-09 CSN3566 - Jul 9, 07:00 UTCJul 9, 07:20 UTC20m
2026-07-09 CSN3565 - Jul 9, 01:30 UTCJul 9, 01:40 UTC10m
2026-07-08 CSN8158 - Jul 8, 20:00 UTCJul 8, 22:15 UTC2h 15m
2026-07-08 CSN8157 - Jul 8, 16:30 UTCJul 8, 18:40 UTC2h 10m
2026-07-08 CSN8492 - Jul 8, 14:30 UTCJul 8, 14:45 UTC15m
2026-07-08 CSN8491 - Jul 8, 08:05 UTCJul 8, 08:15 UTC10m

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.

Mode-S 7823C9 frequently asked

What is Mode-S code 7823C9?
7823C9 is an ICAO 24-bit transponder address. Allocated to China.
Where is Mode-S 7823C9 registered?
Mode-S code 7823C9 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7823C9 broadcasting right now?
No active broadcast right now. Last signal was 26d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7823C9, octal 36021711, decimal 7,873,481.
What flights does 7823C9 operate?
Mode-S 7823C9 has broadcast 20 distinct callsigns, including CSN3369, CSN3171, CSN3370, CSN8492, CSN8491.