Apparatus

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sensors Mode-S transponder

7821B5

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32K0 · AIRBUS A-321neo

Hex
7821B5
Octal
36020665
Decimal
7,872,949
Country
CN
Tail
B-32K0
Type
A21N
No current signal · last broadcast 1d ago
Flights observed
118
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7821B5.

Country allocation

The ICAO 24-bit address 7821B5 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
CSN6358 - 21 2026-07-12
CSN6610 - 18 2026-07-08
CSN6609 - 15 2026-07-08
CSN6357 - 11 2026-07-12
CSN6180 - 7 2026-07-06
CSN6852 China Southern Airlines 4 2026-06-21
CSN6553 - 4 2026-07-11
CSN6377 China Southern Airlines 4 2026-06-20
CSN6341 China Southern Airlines 4 2026-06-10
CSN6545 - 3 2026-07-13
CSN6405 - 3 2026-07-09
CSN6378 China Southern Airlines 3 2026-06-21
CSN6541 - 2 2026-06-30
CSN6476 - 2 2026-07-12
CSN6364 - 2 2026-06-20
CSN6342 China Southern Airlines 2 2026-06-10
CSN6179 - 2 2026-06-24
CSN6155 China Southern Airlines 2 2026-06-14
CSN3571 China Southern Airlines 2 2026-04-17
CSN6475 - 1 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSN6545 - Jul 13, 00:25 UTCJul 13, 14:15 UTC13h 50m
2026-07-12 CSN6476 - Jul 12, 15:05 UTCJul 13, 09:40 UTC18h 35m
2026-07-12 CSN6358 - Jul 12, 08:45 UTCJul 12, 09:05 UTC20m
2026-07-12 CSN6358 - Jul 12, 06:30 UTCJul 12, 06:45 UTC15m
2026-07-12 CSN6357 - Jul 12, 04:20 UTCJul 12, 04:30 UTC10m
2026-07-11 CSN6553 - Jul 11, 09:25 UTCJul 12, 02:05 UTC16h 40m
2026-07-11 CSN6553 - Jul 11, 00:15 UTCJul 11, 14:35 UTC14h 20m
2026-07-10 CSN6553 - Jul 10, 14:20 UTCJul 11, 10:10 UTC19h 51m
2026-07-10 CSN6553 - Jul 10, 01:30 UTCJul 11, 01:00 UTC23h 30m
2026-07-09 CSN6405 - Jul 9, 10:05 UTCJul 10, 02:15 UTC16h 10m
2026-07-08 CSN6405 - Jul 8, 12:30 UTCJul 9, 10:50 UTC22h 20m
2026-07-08 CSN6610 - Jul 8, 10:05 UTCJul 8, 10:15 UTC10m
2026-07-08 CSN6609 - Jul 8, 07:55 UTCJul 8, 08:20 UTC25m
2026-07-08 CSN6609 - Jul 8, 00:55 UTCJul 8, 05:00 UTC4h 5m
2026-07-07 CSN3915 - Jul 7, 16:30 UTCJul 7, 16:40 UTC10m
2026-07-06 CSN6610 - Jul 6, 13:30 UTCJul 6, 13:45 UTC15m
2026-07-06 CSN6610 - Jul 6, 11:10 UTCJul 6, 11:25 UTC15m
2026-07-06 CSN6609 - Jul 6, 07:40 UTCJul 6, 07:50 UTC10m
2026-07-06 CSN6180 - Jul 6, 00:55 UTCJul 6, 05:00 UTC4h 5m
2026-07-05 CSN6475 - Jul 5, 14:25 UTCJul 5, 14:40 UTC15m
2026-07-04 CSN6405 - Jul 4, 01:00 UTCJul 4, 15:15 UTC14h 15m
2026-07-03 CSN6545 - Jul 3, 10:35 UTCJul 4, 01:10 UTC14h 35m
2026-07-03 CSN6545 - Jul 3, 00:20 UTCJul 3, 10:35 UTC10h 15m
2026-07-01 CSN6168 - Jul 1, 13:35 UTCJul 1, 13:45 UTC10m
2026-06-30 CSN6541 - Jun 30, 11:25 UTCJul 1, 02:15 UTC14h 50m
2026-06-30 CSN6610 - Jun 30, 09:05 UTCJun 30, 09:15 UTC10m
2026-06-30 CSN6609 - Jun 30, 07:10 UTCJun 30, 07:25 UTC15m
2026-06-30 CSN6609 - Jun 30, 04:35 UTCJun 30, 04:50 UTC15m
2026-06-30 CSN6180 - Jun 30, 00:45 UTCJun 30, 01:00 UTC15m
2026-06-27 CSN6358 - Jun 27, 08:49 UTCJun 27, 09:04 UTC15m
2026-06-27 CSN6358 - Jun 27, 06:25 UTCJun 27, 06:35 UTC10m
2026-06-27 CSN6357 - Jun 27, 04:00 UTCJun 27, 04:15 UTC15m
2026-06-26 CSN6610 - Jun 26, 11:24 UTCJun 27, 01:44 UTC14h 20m
2026-06-26 CSN6609 - Jun 26, 00:59 UTCJun 26, 04:39 UTC3h 40m
2026-06-24 CSN6179 - Jun 24, 12:54 UTCJun 24, 13:05 UTC10m
2026-06-24 CSN6358 - Jun 24, 08:55 UTCJun 24, 09:05 UTC10m
2026-06-24 CSN6358 - Jun 24, 06:29 UTCJun 24, 06:39 UTC10m
2026-06-23 CSN6610 - Jun 23, 11:35 UTCJun 24, 01:44 UTC14h 10m
2026-06-23 CSN6610 - Jun 23, 09:14 UTCJun 23, 09:29 UTC15m
2026-06-23 CSN6609 - Jun 23, 07:40 UTCJun 23, 07:49 UTC10m
2026-06-23 CSN6180 - Jun 23, 00:45 UTCJun 23, 04:55 UTC4h 10m
2026-06-21 CSN6852 CAN → CGQ Jun 21, 14:40 UTCJun 22, 08:25 UTC17h 45m
2026-06-21 CSN6852 CAN → CGQ Jun 21, 07:20 UTCJun 22, 01:19 UTC18h 0m
2026-06-21 CSN6852 CAN → CGQ Jun 21, 03:19 UTCJun 22, 01:19 UTC22h 0m
2026-06-21 CSN6378 CAN → CGQ Jun 21, 03:05 UTCJun 21, 14:54 UTC11h 50m
2026-06-20 CSN6377 CGQ → CAN Jun 20, 12:09 UTCJun 21, 07:34 UTC19h 25m
2026-06-20 CSN6364 - Jun 20, 07:24 UTCJun 21, 03:19 UTC19h 55m
2026-06-15 CSN6541 - Jun 15, 01:35 UTCJun 15, 14:34 UTC13h 0m
2026-06-14 CSN6155 CGQ → PVG Jun 14, 07:25 UTCJun 15, 02:20 UTC18h 54m
2026-06-11 CSN6442 - Jun 11, 14:35 UTCJun 12, 08:10 UTC17h 36m

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-32K0 page for operator, model, and routing details .

Mode-S 7821B5 frequently asked

What is Mode-S code 7821B5?
7821B5 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32K0.
Where is Mode-S 7821B5 registered?
Mode-S code 7821B5 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821B5 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 7821B5, octal 36020665, decimal 7,872,949.
What flights does 7821B5 operate?
Mode-S 7821B5 has broadcast 20 distinct callsigns, including CSN6358, CSN6610, CSN6609, CSN6357, CSN6180.