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 Jul 26, 07:05 UTC
Flights observed
166
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 07:05 UTC

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 China Southern Airlines 48 2026-07-23
CSN628 China Southern Airlines 30 2026-07-24
CSN6367 - 12 2026-06-20
CSN6309 - 9 2026-06-18
CSN681 China Southern Airlines 8 2026-07-22
CSN6312 - 8 2026-07-20
CSN6311 China Southern Airlines 8 2026-07-20
CSN682 - 6 2026-07-17
CSN6507 - 5 2026-07-15
CSN6310 - 5 2026-06-18
CSN6503 China Southern Airlines 4 2026-06-09
CSN6402 China Southern Airlines 3 2026-07-25
CSN3602 - 3 2026-06-26
CSN6501 - 2 2026-07-17
CSN6368 China Southern Airlines 2 2026-05-04
CSN6265 China Southern Airlines 2 2026-07-26
CSN5817 - 2 2026-07-16
CSN6529 China Southern Airlines 1 2026-06-12
CSN6519 China Southern Airlines 1 2026-05-22
CSN6517 - 1 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN6265 SHE → HGH Jul 26, 06:35 UTCJul 26, 07:05 UTC30m
2026-07-25 CSN6402 TFU → SHE Jul 25, 09:05 UTCJul 26, 07:05 UTC22h 1m
2026-07-24 CSN6402 TFU → SHE Jul 24, 10:55 UTCJul 25, 09:25 UTC22h 30m
2026-07-24 CSN628 NRT → SHE Jul 24, 05:15 UTCJul 24, 11:20 UTC6h 5m
2026-07-23 CSN627 SHE → NRT Jul 23, 08:25 UTCJul 24, 03:05 UTC18h 40m
2026-07-23 CSN627 SHE → NRT Jul 23, 04:15 UTCJul 24, 03:05 UTC22h 50m
2026-07-22 CSN681 SHE → ICN Jul 22, 14:35 UTCJul 23, 02:30 UTC11h 55m
2026-07-22 CSN628 NRT → SHE Jul 22, 05:00 UTCJul 23, 02:30 UTC21h 30m
2026-07-22 CSN627 SHE → NRT Jul 22, 02:30 UTCJul 22, 03:15 UTC45m
2026-07-20 CSN6312 - Jul 20, 08:00 UTCJul 20, 10:25 UTC2h 25m
2026-07-20 CSN6311 SHE → SZX Jul 20, 03:45 UTCJul 20, 03:55 UTC10m
2026-07-19 CSN6311 SHE → SZX Jul 19, 12:45 UTCJul 20, 01:25 UTC12h 40m
2026-07-19 CSN628 - Jul 19, 04:55 UTCJul 20, 01:25 UTC20h 30m
2026-07-18 CSN627 SHE → NRT Jul 18, 07:50 UTCJul 19, 03:15 UTC19h 25m
2026-07-18 CSN627 SHE → NRT Jul 18, 07:35 UTCJul 19, 03:15 UTC19h 40m
2026-07-17 CSN6501 - Jul 17, 08:00 UTCJul 18, 07:45 UTC23h 46m
2026-07-17 CSN682 - Jul 17, 04:44 UTCJul 17, 08:15 UTC3h 30m
2026-07-16 CSN681 - Jul 16, 08:35 UTCJul 17, 02:10 UTC17h 35m
2026-07-16 CSN5817 - Jul 16, 00:50 UTCJul 16, 15:35 UTC14h 45m
2026-07-15 CSN5817 - Jul 15, 15:20 UTCJul 16, 08:50 UTC17h 30m
2026-07-15 CSN6507 - Jul 15, 11:00 UTCJul 16, 08:50 UTC21h 50m
2026-07-15 CSN6507 - Jul 15, 05:50 UTCJul 16, 01:05 UTC19h 15m
2026-07-15 CSN628 - Jul 15, 05:15 UTCJul 16, 01:05 UTC19h 50m
2026-07-15 CSN627 - Jul 15, 02:20 UTCJul 15, 03:00 UTC40m
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

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 Jul 26, 07:05 UTC.
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, CSN681.