Apparatus

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sensors Mode-S transponder

7821B6

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32K1 · AIRBUS A-321neo

Hex
7821B6
Octal
36020666
Decimal
7,872,950
Country
CN
Tail
B-32K1
Type
A21N
No current signal · last broadcast Jul 26, 06:10 UTC
Flights observed
146
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 06:10 UTC

Last known position

Most recent position reported by Mode-S 7821B6.

Country allocation

The ICAO 24-bit address 7821B6 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
CSN6148 China Southern Airlines 38 2026-07-25
CSN6147 - 17 2026-07-17
CSN6228 China Southern Airlines 9 2026-06-25
CSN6670 China Southern Airlines 6 2026-05-30
CSN6712 - 5 2026-06-28
CSN6624 - 5 2026-07-01
CSN6190 China Southern Airlines 4 2026-06-24
CSN3978 - 4 2026-07-12
CSN3977 - 4 2026-07-11
CSN8920 China Southern Airlines 3 2026-07-25
CSN6796 China Southern Airlines 3 2026-06-12
CSN6762 China Southern Airlines 3 2026-04-22
CSN6758 - 3 2026-07-04
CSN6782 - 2 2026-07-01
CSN6757 - 2 2026-07-04
CSN6754 China Southern Airlines 2 2026-06-11
CSN6744 China Southern Airlines 2 2026-05-26
CSN6717 - 2 2026-06-28
CSN6630 China Southern Airlines 2 2026-05-16
CSN6629 China Southern Airlines 2 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CSN8920 XIY → SYX Jul 25, 12:35 UTCJul 26, 06:10 UTC17h 35m
2026-07-25 CSN6148 HRB → SYX Jul 25, 09:40 UTCJul 26, 06:10 UTC20h 30m
2026-07-25 CSN6257 HRB → PVG Jul 25, 01:05 UTCJul 25, 12:35 UTC11h 30m
2026-07-24 CSN6257 HRB → PVG Jul 24, 15:05 UTCJul 25, 12:35 UTC21h 30m
2026-07-24 CSN6278 JHG → CAN Jul 24, 12:40 UTCJul 24, 12:50 UTC10m
2026-07-22 CSN6141 HRB → PVG Jul 22, 11:15 UTCJul 22, 14:55 UTC3h 40m
2026-07-21 CSN6141 HRB → PVG Jul 21, 15:15 UTCJul 22, 11:20 UTC20h 5m
2026-07-21 CSN6430 CGO → SYX Jul 21, 08:30 UTCJul 21, 15:30 UTC7h 0m
2026-07-20 CSN6430 CGO → SYX Jul 20, 16:15 UTCJul 21, 15:30 UTC23h 15m
2026-07-19 CSN6293 SYX → KMG Jul 19, 11:45 UTCJul 19, 15:10 UTC3h 25m
2026-07-18 CSN8920 - Jul 18, 05:50 UTCJul 18, 06:10 UTC20m
2026-07-17 CSN6148 - Jul 17, 09:50 UTCJul 18, 06:10 UTC20h 21m
2026-07-17 CSN6147 - Jul 17, 05:45 UTCJul 17, 10:10 UTC4h 25m
2026-07-15 - - Jul 15, 08:45 UTCJul 15, 09:00 UTC15m
2026-07-13 CSN6147 - Jul 13, 05:55 UTCJul 13, 12:40 UTC6h 45m
2026-07-12 CSN6147 - Jul 12, 15:30 UTCJul 13, 12:40 UTC21h 10m
2026-07-12 CSN6147 - Jul 12, 08:50 UTCJul 13, 06:15 UTC21h 25m
2026-07-12 CSN3978 - Jul 12, 01:35 UTCJul 12, 01:50 UTC15m
2026-07-11 CSN3977 - Jul 11, 23:55 UTCJul 12, 00:10 UTC15m
2026-07-11 CSN6148 - Jul 11, 05:35 UTCJul 11, 09:50 UTC4h 15m
2026-07-10 CSN6148 - Jul 10, 09:35 UTCJul 11, 09:30 UTC23h 55m
2026-07-10 CSN6148 - Jul 10, 09:25 UTCJul 11, 05:45 UTC20h 20m
2026-07-10 CSN6147 - Jul 10, 05:30 UTCJul 10, 09:45 UTC4h 15m
2026-07-09 CSN6148 - Jul 9, 09:50 UTCJul 10, 09:30 UTC23h 40m
2026-07-09 CSN6147 - Jul 9, 05:35 UTCJul 10, 05:30 UTC23h 55m
2026-07-08 CSN6147 - Jul 8, 02:40 UTCJul 8, 12:45 UTC10h 5m
2026-07-07 CSN6148 - Jul 7, 02:40 UTCJul 7, 12:20 UTC9h 40m
2026-07-06 CSN6148 - Jul 6, 10:30 UTCJul 7, 09:30 UTC23h 0m
2026-07-06 CSN6148 - Jul 6, 06:20 UTCJul 7, 02:40 UTC20h 20m
2026-07-05 CSN6294 KMG → SYX Jul 5, 14:45 UTCJul 5, 18:25 UTC3h 40m
2026-07-04 CSN6758 - Jul 4, 19:30 UTCJul 5, 09:50 UTC14h 20m
2026-07-04 CSN6757 - Jul 4, 15:50 UTCJul 4, 16:00 UTC10m
2026-07-04 CSN6734 - Jul 4, 09:30 UTCJul 4, 09:40 UTC10m
2026-07-02 CSN6667 - Jul 2, 07:30 UTCJul 2, 13:30 UTC6h 0m
2026-07-01 CSN6782 - Jul 1, 15:45 UTCJul 2, 13:30 UTC21h 45m
2026-07-01 CSN6781 - Jul 1, 09:15 UTCJul 2, 07:30 UTC22h 15m
2026-07-01 CSN6624 - Jul 1, 05:45 UTCJul 1, 15:55 UTC10h 10m
2026-06-30 CSN6624 - Jun 30, 09:10 UTCJul 1, 06:05 UTC20h 55m
2026-06-29 CSN6623 - Jun 29, 14:39 UTCJun 30, 09:20 UTC18h 40m
2026-06-28 CSN6717 - Jun 28, 13:19 UTCJun 28, 13:34 UTC15m
2026-06-28 CSN6717 - Jun 28, 10:19 UTCJun 28, 10:44 UTC25m
2026-06-28 CSN6712 - Jun 28, 00:35 UTCJun 28, 08:25 UTC7h 50m
2026-06-27 CSN6360 - Jun 27, 15:14 UTCJun 27, 15:34 UTC20m
2026-06-26 CSN6359 - Jun 26, 12:00 UTCJun 27, 06:30 UTC18h 30m
2026-06-26 CSN6189 SYX → TFU Jun 26, 07:10 UTCJun 27, 01:59 UTC18h 50m
2026-06-25 CSN6228 CKG → SYX Jun 25, 14:14 UTCJun 26, 04:55 UTC14h 40m
2026-06-25 CSN6228 CKG → SYX Jun 25, 06:40 UTCJun 26, 04:55 UTC22h 15m
2026-06-25 CSN6715 SYX → PKX Jun 25, 03:59 UTCJun 26, 00:30 UTC20h 30m
2026-06-24 CSN6190 TFU → SYX Jun 24, 12:14 UTCJun 25, 07:05 UTC18h 50m
2026-06-24 CSN6190 TFU → SYX Jun 24, 07:34 UTCJun 25, 07:05 UTC23h 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-32K1 page for operator, model, and routing details .

Mode-S 7821B6 frequently asked

What is Mode-S code 7821B6?
7821B6 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32K1.
Where is Mode-S 7821B6 registered?
Mode-S code 7821B6 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821B6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 06:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821B6, octal 36020666, decimal 7,872,950.
What flights does 7821B6 operate?
Mode-S 7821B6 has broadcast 20 distinct callsigns, including CSN6148, CSN6147, CSN6228, CSN6670, CSN6712.