Apparatus

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sensors Mode-S transponder

7816C9

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-308U · AIRBUS A-321neo

Hex
7816C9
Octal
36013311
Decimal
7,870,153
Country
CN
Tail
B-308U
Type
A21N
No current signal · last broadcast 3h ago
Flights observed
141
Distinct callsigns
20
Country
CN
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 7816C9.

Country allocation

The ICAO 24-bit address 7816C9 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
CSN6086 - 14 2026-07-08
CSN6085 - 13 2026-07-08
CSN3906 China Southern Airlines 10 2026-06-12
CSN6141 - 9 2026-07-12
CSN5973 - 9 2026-06-30
CSN5974 - 8 2026-07-04
CSN5300 China Southern Airlines 8 2026-06-07
CSN3744 - 6 2026-06-28
CSN3743 - 6 2026-06-28
CSN6251 - 5 2026-06-20
CSN6295 - 4 2026-07-17
CSN6274 - 4 2026-07-09
CSN5589 - 4 2026-07-18
CSN3616 China Southern Airlines 4 2026-05-30
CSN6273 - 3 2026-07-09
CSN6257 - 3 2026-07-11
CSN8759 - 2 2026-07-02
CSN8326 China Southern Airlines 2 2026-04-29
CSN8325 China Southern Airlines 2 2026-04-27
CSN6277 - 2 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-19 CSN5983 PKX → HRB Jul 19, 01:50 UTCJul 19, 06:20 UTC4h 30m
2026-07-18 CSN5589 - Jul 18, 01:05 UTCJul 18, 10:30 UTC9h 26m
2026-07-17 CSN6295 - Jul 17, 14:15 UTCJul 17, 14:24 UTC10m
2026-07-17 CSN5589 - Jul 17, 01:15 UTCJul 17, 05:45 UTC4h 30m
2026-07-16 CSN6295 - Jul 16, 14:10 UTCJul 16, 14:20 UTC10m
2026-07-16 CSN5589 - Jul 16, 01:05 UTCJul 16, 05:50 UTC4h 45m
2026-07-15 CSN6295 - Jul 15, 14:00 UTCJul 15, 14:10 UTC10m
2026-07-15 CSN5589 - Jul 15, 01:25 UTCJul 15, 06:10 UTC4h 45m
2026-07-14 CSN6296 - Jul 14, 01:10 UTCJul 14, 01:25 UTC15m
2026-07-13 CSN6295 - Jul 13, 13:50 UTCJul 13, 14:00 UTC10m
2026-07-13 CSN3623 - Jul 13, 08:45 UTCJul 13, 09:05 UTC20m
2026-07-12 CSN6141 - Jul 12, 09:50 UTCJul 13, 02:30 UTC16h 40m
2026-07-11 CSN6141 - Jul 11, 13:25 UTCJul 12, 10:35 UTC21h 10m
2026-07-11 CSN6257 - Jul 11, 00:25 UTCJul 11, 13:35 UTC13h 10m
2026-07-10 CSN6257 - Jul 10, 14:50 UTCJul 11, 13:35 UTC22h 45m
2026-07-09 CSN5967 - Jul 9, 13:35 UTCJul 9, 13:45 UTC10m
2026-07-09 CSN6274 - Jul 9, 09:35 UTCJul 9, 09:55 UTC20m
2026-07-09 CSN6274 - Jul 9, 07:05 UTCJul 9, 07:15 UTC10m
2026-07-09 CSN6273 - Jul 9, 05:00 UTCJul 9, 05:20 UTC20m
2026-07-08 CSN6141 - Jul 8, 09:50 UTCJul 9, 02:50 UTC17h 0m
2026-07-08 CSN6141 - Jul 8, 04:20 UTCJul 9, 02:50 UTC22h 30m
2026-07-08 CSN6086 - Jul 8, 04:00 UTCJul 8, 15:20 UTC11h 20m
2026-07-08 CSN6085 - Jul 8, 01:45 UTCJul 8, 02:30 UTC45m
2026-07-07 CSN6277 - Jul 7, 01:30 UTCJul 7, 01:40 UTC10m
2026-07-06 CSN6141 - Jul 6, 10:55 UTCJul 6, 16:15 UTC5h 20m
2026-07-05 CSN6141 - Jul 5, 15:35 UTCJul 6, 11:40 UTC20h 5m
2026-07-05 CSN6086 - Jul 5, 04:10 UTCJul 5, 15:35 UTC11h 25m
2026-07-04 CSN6085 - Jul 4, 13:05 UTCJul 5, 02:45 UTC13h 40m
2026-07-04 CSN5974 - Jul 4, 01:00 UTCJul 4, 13:20 UTC12h 20m
2026-07-03 CSN5974 - Jul 3, 15:00 UTCJul 4, 13:20 UTC22h 20m
2026-07-02 CSN8759 - Jul 2, 01:05 UTCJul 2, 13:30 UTC12h 25m
2026-07-01 CSN8759 - Jul 1, 13:50 UTCJul 2, 01:50 UTC12h 0m
2026-07-01 CSN6086 - Jul 1, 04:20 UTCJul 2, 01:50 UTC21h 30m
2026-07-01 CSN6086 - Jul 1, 04:00 UTCJul 2, 01:50 UTC21h 50m
2026-06-30 CSN6085 - Jun 30, 14:30 UTCJul 1, 02:30 UTC12h 0m
2026-06-30 CSN5973 - Jun 30, 01:04 UTCJun 30, 01:14 UTC10m
2026-06-28 CSN3744 - Jun 28, 11:59 UTCJun 28, 12:15 UTC15m
2026-06-28 CSN3744 - Jun 28, 09:39 UTCJun 28, 09:50 UTC10m
2026-06-28 CSN3743 - Jun 28, 04:15 UTCJun 28, 04:29 UTC15m
2026-06-26 CSN6277 - Jun 26, 01:24 UTCJun 26, 01:34 UTC10m
2026-06-25 CSN5824 WUH → HRB Jun 25, 01:50 UTCJun 25, 10:30 UTC8h 40m
2026-06-24 CSN5974 - Jun 24, 13:05 UTCJun 25, 10:30 UTC21h 25m
2026-06-24 CSN5973 - Jun 24, 01:19 UTCJun 24, 13:24 UTC12h 5m
2026-06-23 CSN5974 - Jun 23, 12:49 UTCJun 24, 01:34 UTC12h 45m
2026-06-23 CSN5974 - Jun 23, 01:10 UTCJun 23, 13:09 UTC12h 0m
2026-06-22 CSN3744 - Jun 22, 11:54 UTCJun 23, 01:25 UTC13h 30m
2026-06-22 CSN3744 - Jun 22, 09:40 UTCJun 22, 09:49 UTC10m
2026-06-22 CSN3743 - Jun 22, 07:04 UTCJun 22, 07:14 UTC10m
2026-06-21 CSN3743 - Jun 21, 10:40 UTCJun 22, 04:34 UTC17h 55m
2026-06-21 CSN8635 - Jun 21, 10:04 UTCJun 22, 04:34 UTC18h 30m

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-308U page for operator, model, and routing details .

Mode-S 7816C9 frequently asked

What is Mode-S code 7816C9?
7816C9 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-308U.
Where is Mode-S 7816C9 registered?
Mode-S code 7816C9 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7816C9 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7816C9, octal 36013311, decimal 7,870,153.
What flights does 7816C9 operate?
Mode-S 7816C9 has broadcast 20 distinct callsigns, including CSN6086, CSN6085, CSN3906, CSN6141, CSN5973.