Apparatus

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sensors Mode-S transponder

7821B8

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32K3 · AIRBUS A-321neo

Hex
7821B8
Octal
36020670
Decimal
7,872,952
Country
CN
Tail
B-32K3
Type
A21N
No current signal · last broadcast 13h ago
Flights observed
80
Distinct callsigns
20
Country
CN
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 7821B8.

Country allocation

The ICAO 24-bit address 7821B8 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
CSN627 China Southern Airlines 20 2026-06-01
CSN628 China Southern Airlines 11 2026-06-01
CSN6310 China Southern Airlines 6 2026-05-31
CSN682 China Southern Airlines 5 2026-06-02
CSN681 China Southern Airlines 5 2026-06-02
CSN6367 China Southern Airlines 5 2026-05-26
CSN6309 China Southern Airlines 5 2026-05-28
CSN6312 China Southern Airlines 3 2026-05-05
CSN6311 China Southern Airlines 3 2026-05-04
CSN6519 China Southern Airlines 2 2026-05-26
CSN6507 China Southern Airlines 2 2026-04-29
CSN6483 China Southern Airlines 2 2026-05-06
CSN6469 China Southern Airlines 2 2026-05-09
CSN6315 China Southern Airlines 2 2026-04-25
CSN6517 China Southern Airlines 1 2026-05-18
CSN6515 China Southern Airlines 1 2026-05-24
CSN6503 China Southern Airlines 1 2026-04-16
CSN6368 China Southern Airlines 1 2026-05-25
CSN6339 China Southern Airlines 1 2026-04-24
CSN5857 China Southern Airlines 1 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 CSN682 ICN → SHE Jun 2, 04:15 UTCJun 2, 07:55 UTC3h 40m
2026-06-02 CSN681 SHE → ICN Jun 2, 02:00 UTCJun 2, 02:30 UTC30m
2026-06-01 CSN628 NRT → SHE Jun 1, 05:10 UTCJun 1, 05:45 UTC35m
2026-06-01 CSN627 SHE → NRT Jun 1, 02:50 UTCJun 1, 03:35 UTC45m
2026-05-31 CSN6310 SZX → SHE May 31, 09:40 UTCMay 31, 10:00 UTC20m
2026-05-29 CSN628 NRT → SHE May 29, 05:20 UTCMay 29, 15:35 UTC10h 15m
2026-05-28 CSN627 SHE → NRT May 28, 12:00 UTCMay 29, 03:15 UTC15h 15m
2026-05-28 CSN6310 SZX → SHE May 28, 09:45 UTCMay 28, 09:55 UTC10m
2026-05-28 CSN6309 SHE → SZX May 28, 07:35 UTCMay 28, 07:55 UTC20m
2026-05-28 CSN6309 SHE → SZX May 28, 05:05 UTCMay 28, 05:15 UTC10m
2026-05-26 CSN6367 SHE → CAN May 26, 09:45 UTCMay 27, 03:09 UTC17h 25m
2026-05-26 CSN6519 SHE → PVG May 26, 01:34 UTCMay 26, 09:59 UTC8h 25m
2026-05-25 CSN6368 CAN → SHE May 25, 10:05 UTCMay 26, 09:59 UTC23h 55m
2026-05-24 CSN6515 SHE → PVG May 24, 04:55 UTCMay 24, 05:25 UTC30m
2026-05-22 CSN6310 SZX → SHE May 22, 09:50 UTCMay 22, 10:05 UTC15m
2026-05-22 CSN6309 SHE → SZX May 22, 07:35 UTCMay 22, 07:45 UTC10m
2026-05-21 CSN5811 SHE → HGH May 21, 04:35 UTCMay 21, 04:50 UTC15m
2026-05-20 CSN628 NRT → SHE May 20, 05:00 UTCMay 20, 05:35 UTC35m
2026-05-20 CSN627 SHE → NRT May 20, 02:35 UTCMay 20, 03:15 UTC40m
2026-05-18 CSN6517 SHE → XMN May 18, 10:00 UTCMay 19, 03:20 UTC17h 19m
2026-05-18 CSN628 NRT → SHE May 18, 04:55 UTCMay 19, 03:20 UTC22h 24m
2026-05-17 CSN627 SHE → NRT May 17, 11:35 UTCMay 18, 03:10 UTC15h 35m
2026-05-17 CSN627 SHE → NRT May 17, 04:15 UTCMay 18, 03:10 UTC22h 55m
2026-05-14 CSN6310 SZX → SHE May 14, 09:50 UTCMay 14, 10:00 UTC10m
2026-05-12 CSN6310 SZX → SHE May 12, 09:30 UTCMay 12, 09:45 UTC15m
2026-05-12 CSN6309 SHE → SZX May 12, 07:25 UTCMay 12, 07:35 UTC10m
2026-05-10 CSN6310 SZX → SHE May 10, 09:35 UTCMay 10, 09:45 UTC10m
2026-05-10 CSN6309 SHE → SZX May 10, 07:45 UTCMay 10, 07:55 UTC10m
2026-05-09 CSN6469 SHE → CKG May 9, 04:55 UTCMay 9, 10:55 UTC6h 0m
2026-05-08 CSN6469 SHE → CKG May 8, 11:25 UTCMay 9, 05:15 UTC17h 50m
2026-05-08 CSN628 NRT → SHE May 8, 05:00 UTCMay 8, 11:49 UTC6h 50m
2026-05-07 CSN627 SHE → NRT May 7, 10:00 UTCMay 8, 03:35 UTC17h 35m
2026-05-07 CSN6367 SHE → CAN May 7, 03:15 UTCMay 7, 10:15 UTC7h 0m
2026-05-06 CSN6367 SHE → CAN May 6, 10:10 UTCMay 7, 10:00 UTC23h 50m
2026-05-06 CSN6483 SHE → SYX May 6, 01:55 UTCMay 6, 10:15 UTC8h 20m
2026-05-05 CSN6483 SHE → SYX May 5, 08:40 UTCMay 6, 02:25 UTC17h 45m
2026-05-05 CSN6312 SZX → SHE May 5, 06:05 UTCMay 5, 06:20 UTC15m
2026-05-04 CSN6311 SHE → SZX May 4, 10:15 UTCMay 5, 01:15 UTC15h 1m
2026-05-04 CSN628 NRT → SHE May 4, 05:15 UTCMay 5, 01:15 UTC20h 1m
2026-05-03 CSN627 SHE → NRT May 3, 11:20 UTCMay 4, 03:15 UTC15h 55m
2026-05-03 CSN627 SHE → NRT May 3, 05:00 UTCMay 4, 03:15 UTC22h 15m
2026-05-02 CSN627 SHE → NRT May 2, 08:15 UTCMay 3, 02:50 UTC18h 35m
2026-05-02 CSN6312 SZX → SHE May 2, 06:00 UTCMay 2, 06:15 UTC15m
2026-05-02 CSN6311 SHE → SZX May 2, 03:55 UTCMay 2, 04:10 UTC15m
2026-05-01 CSN6311 SHE → SZX May 1, 11:30 UTCMay 2, 01:25 UTC13h 55m
2026-05-01 CSN628 NRT → SHE May 1, 05:05 UTCMay 2, 01:25 UTC20h 20m
2026-04-30 CSN627 SHE → NRT Apr 30, 09:50 UTCMay 1, 03:25 UTC17h 35m
2026-04-30 CSN6519 SHE → PVG Apr 30, 01:05 UTCApr 30, 09:50 UTC8h 45m
2026-04-29 CSN6507 SHE → PVG Apr 29, 11:55 UTCApr 30, 09:50 UTC21h 54m
2026-04-29 CSN628 NRT → SHE Apr 29, 05:05 UTCApr 30, 01:20 UTC20h 15m

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-32K3 page for operator, model, and routing details .

Mode-S 7821B8 frequently asked

What is Mode-S code 7821B8?
7821B8 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32K3.
Where is Mode-S 7821B8 registered?
Mode-S code 7821B8 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821B8 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821B8, octal 36020670, decimal 7,872,952.
What flights does 7821B8 operate?
Mode-S 7821B8 has broadcast 20 distinct callsigns, including CSN627, CSN628, CSN6310, CSN682, CSN681.