Apparatus

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sensors Mode-S transponder

7821B7

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32K2 · AIRBUS A-321neo

Hex
7821B7
Octal
36020667
Decimal
7,872,951
Country
CN
Tail
B-32K2
Type
A21N
No current signal · last broadcast 1d ago
Flights observed
142
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7821B7.

Country allocation

The ICAO 24-bit address 7821B7 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 - 42 2026-07-12
CSN628 - 26 2026-07-13
CSN6367 - 12 2026-06-20
CSN6309 - 9 2026-06-18
CSN6312 - 7 2026-07-04
CSN681 China Southern Airlines 6 2026-06-09
CSN6311 - 6 2026-07-04
CSN682 China Southern Airlines 5 2026-06-09
CSN6310 - 5 2026-06-18
CSN6503 China Southern Airlines 4 2026-06-09
CSN6507 China Southern Airlines 3 2026-05-15
CSN3602 - 3 2026-06-26
CSN6368 China Southern Airlines 2 2026-05-04
CSN6529 China Southern Airlines 1 2026-06-12
CSN6519 China Southern Airlines 1 2026-05-22
CSN6517 - 1 2026-06-13
CSN6501 China Southern Airlines 1 2026-05-28
CSN6462 China Southern Airlines 1 2026-06-23
CSN6402 - 1 2026-07-07
CSN6347 China Southern Airlines 1 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSN628 - Jul 13, 05:45 UTCJul 13, 06:25 UTC40m
2026-07-12 CSN627 - Jul 12, 11:20 UTCJul 13, 04:25 UTC17h 5m
2026-07-12 CSN627 - Jul 12, 05:50 UTCJul 13, 04:25 UTC22h 35m
2026-07-12 CSN628 - Jul 12, 05:10 UTCJul 13, 03:45 UTC22h 35m
2026-07-12 CSN627 - Jul 12, 02:25 UTCJul 12, 03:01 UTC35m
2026-07-10 CSN628 - Jul 10, 05:05 UTCJul 10, 11:00 UTC5h 55m
2026-07-09 CSN627 - Jul 9, 07:50 UTCJul 10, 03:25 UTC19h 35m
2026-07-09 CSN627 - Jul 9, 07:35 UTCJul 10, 03:25 UTC19h 50m
2026-07-07 CSN6402 - Jul 7, 07:40 UTCJul 7, 07:50 UTC10m
2026-07-05 CSN6265 - Jul 5, 08:20 UTCJul 6, 01:30 UTC17h 10m
2026-07-04 CSN6312 - Jul 4, 10:50 UTCJul 5, 08:35 UTC21h 45m
2026-07-04 CSN6312 - Jul 4, 08:30 UTCJul 4, 08:45 UTC15m
2026-07-04 CSN6311 - Jul 4, 05:35 UTCJul 4, 06:00 UTC25m
2026-07-03 CSN6311 - Jul 3, 13:05 UTCJul 4, 03:10 UTC14h 5m
2026-07-03 CSN628 - Jul 3, 05:00 UTCJul 4, 03:10 UTC22h 10m
2026-07-03 CSN627 - Jul 3, 02:20 UTCJul 3, 03:10 UTC50m
2026-06-30 CSN6312 - Jun 30, 05:55 UTCJun 30, 06:10 UTC15m
2026-06-30 CSN6311 - Jun 30, 01:00 UTCJun 30, 01:09 UTC10m
2026-06-29 CSN628 - Jun 29, 04:55 UTCJun 29, 05:34 UTC40m
2026-06-28 CSN627 - Jun 28, 10:55 UTCJun 29, 03:10 UTC16h 15m
2026-06-28 CSN627 - Jun 28, 05:04 UTCJun 29, 03:10 UTC22h 5m
2026-06-27 CSN627 - Jun 27, 08:55 UTCJun 28, 03:14 UTC18h 20m
2026-06-26 CSN3602 - Jun 26, 11:20 UTCJun 27, 09:04 UTC21h 45m
2026-06-26 CSN628 - Jun 26, 05:05 UTCJun 26, 11:24 UTC6h 20m
2026-06-26 CSN627 - Jun 26, 02:44 UTCJun 26, 03:45 UTC1h 0m
2026-06-24 CSN628 - Jun 24, 05:09 UTCJun 24, 11:45 UTC6h 35m
2026-06-23 CSN627 - Jun 23, 16:29 UTCJun 24, 02:54 UTC10h 25m
2026-06-23 CSN6462 URC → SHE Jun 23, 01:04 UTCJun 23, 16:35 UTC15h 30m
2026-06-22 CSN628 - Jun 22, 05:10 UTCJun 23, 01:04 UTC19h 55m
2026-06-22 CSN627 - Jun 22, 02:30 UTCJun 22, 03:14 UTC45m
2026-06-21 CSN628 - Jun 21, 05:04 UTCJun 22, 03:14 UTC22h 10m
2026-06-20 CSN627 - Jun 20, 09:59 UTCJun 21, 03:14 UTC17h 15m
2026-06-20 CSN6367 - Jun 20, 02:40 UTCJun 20, 10:09 UTC7h 30m
2026-06-19 CSN628 - Jun 19, 04:54 UTCJun 20, 02:54 UTC22h 0m
2026-06-19 CSN627 - Jun 19, 02:29 UTCJun 19, 03:24 UTC55m
2026-06-18 CSN6310 - Jun 18, 14:40 UTCJun 18, 14:55 UTC15m
2026-06-18 CSN6309 - Jun 18, 06:05 UTCJun 18, 08:35 UTC2h 30m
2026-06-17 CSN6309 - Jun 17, 11:00 UTCJun 18, 08:35 UTC21h 35m
2026-06-17 CSN628 - Jun 17, 05:05 UTCJun 17, 11:10 UTC6h 5m
2026-06-16 CSN627 - Jun 16, 11:05 UTCJun 17, 03:15 UTC16h 11m
2026-06-13 CSN6517 - Jun 13, 07:50 UTCJun 14, 03:00 UTC19h 10m
2026-06-12 CSN6529 SHE → NGB Jun 12, 01:00 UTCJun 12, 08:20 UTC7h 20m
2026-06-11 CSN3602 SHE → CAN Jun 11, 00:25 UTCJun 11, 09:05 UTC8h 40m
2026-06-09 CSN6503 SHE → PVG Jun 9, 08:05 UTCJun 10, 01:15 UTC17h 10m
2026-06-09 CSN682 ICN → SHE Jun 9, 03:50 UTCJun 10, 01:15 UTC21h 25m
2026-06-09 CSN681 SHE → ICN Jun 9, 01:55 UTCJun 9, 02:15 UTC20m
2026-06-08 CSN628 NRT → SHE Jun 8, 05:05 UTCJun 8, 05:40 UTC35m
2026-06-08 CSN627 SHE → NRT Jun 8, 02:25 UTCJun 8, 03:15 UTC50m
2026-06-07 CSN628 NRT → SHE Jun 7, 05:00 UTCJun 7, 05:35 UTC35m
2026-06-06 CSN627 SHE → NRT Jun 6, 08:30 UTCJun 7, 03:00 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-32K2 page for operator, model, and routing details .

Mode-S 7821B7 frequently asked

What is Mode-S code 7821B7?
7821B7 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32K2.
Where is Mode-S 7821B7 registered?
Mode-S code 7821B7 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821B7 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821B7, octal 36020667, decimal 7,872,951.
What flights does 7821B7 operate?
Mode-S 7821B7 has broadcast 20 distinct callsigns, including CSN627, CSN628, CSN6367, CSN6309, CSN6312.