Apparatus

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sensors Mode-S transponder

7821FF

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32KW · AIRBUS A-320neo

Hex
7821FF
Octal
36020777
Decimal
7,873,023
Country
CN
Tail
B-32KW
Type
A20N
No current signal · last broadcast 3d ago
Flights observed
34
Distinct callsigns
11
Country
CN
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 7821FF.

Country allocation

The ICAO 24-bit address 7821FF 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 11 distinct

Callsign Airline Flights Last seen
CSC3938 Sichuan Airlines 11 2026-06-05
CSC3937 Sichuan Airlines 11 2026-06-05
CSC8237 Sichuan Airlines 2 2026-05-09
CSC3920 Sichuan Airlines 2 2026-05-31
CSC3919 Sichuan Airlines 2 2026-05-31
CSC8784 Sichuan Airlines 1 2026-05-23
CSC8048 Sichuan Airlines 1 2026-05-23
CSC3784 Sichuan Airlines 1 2026-06-07
CSC3783 Sichuan Airlines 1 2026-06-07
CSC3772 Sichuan Airlines 1 2026-05-26
CSC3771 Sichuan Airlines 1 2026-05-26

Recent flights last 34

DateFlightRouteTakeoffLandingDuration
2026-06-07 CSC3784 TSA → CKG Jun 7, 11:00 UTCJun 7, 12:20 UTC1h 20m
2026-06-07 CSC3783 CKG → TSA Jun 7, 01:35 UTCJun 7, 09:30 UTC7h 55m
2026-06-05 CSC3938 BKK → TFU Jun 5, 18:15 UTCJun 5, 19:05 UTC50m
2026-06-05 CSC3937 TFU → BKK Jun 5, 15:55 UTCJun 5, 16:50 UTC55m
2026-06-04 CSC3938 BKK → TFU Jun 4, 18:20 UTCJun 5, 16:50 UTC22h 30m
2026-06-04 CSC3937 TFU → BKK Jun 4, 16:00 UTCJun 4, 17:00 UTC1h 0m
2026-05-31 CSC3920 SIN → TFU May 31, 17:30 UTCMay 31, 20:00 UTC2h 30m
2026-05-31 CSC3919 TFU → SIN May 31, 12:50 UTCMay 31, 15:40 UTC2h 50m
2026-05-26 CSC3772 BKK → CKG May 26, 13:10 UTCMay 27, 03:54 UTC14h 45m
2026-05-26 CSC3771 CKG → BKK May 26, 01:14 UTCMay 26, 11:34 UTC10h 20m
2026-05-23 CSC8784 SZX → CKG May 23, 09:45 UTCMay 23, 10:00 UTC15m
2026-05-23 CSC8048 ZUH → CKG May 23, 02:25 UTCMay 23, 02:40 UTC14m
2026-05-14 CSC3938 BKK → TFU May 14, 18:15 UTCMay 14, 19:15 UTC1h 0m
2026-05-14 CSC3937 TFU → BKK May 14, 15:55 UTCMay 14, 16:45 UTC50m
2026-05-13 CSC3938 BKK → TFU May 13, 18:25 UTCMay 14, 16:45 UTC22h 20m
2026-05-13 CSC3937 TFU → BKK May 13, 16:00 UTCMay 13, 17:00 UTC1h 0m
2026-05-11 CSC3938 BKK → TFU May 11, 18:15 UTCMay 11, 19:10 UTC55m
2026-05-11 CSC3937 TFU → BKK May 11, 16:00 UTCMay 11, 16:50 UTC50m
2026-05-10 CSC3938 BKK → TFU May 10, 18:25 UTCMay 11, 16:50 UTC22h 25m
2026-05-10 CSC3937 TFU → BKK May 10, 15:55 UTCMay 10, 17:05 UTC1h 10m
2026-05-09 CSC8237 CGO → HRB May 9, 04:25 UTCMay 9, 04:35 UTC10m
2026-05-07 CSC8237 CGO → HRB May 7, 04:05 UTCMay 7, 04:20 UTC15m
2026-04-30 CSC3920 SIN → TFU Apr 30, 17:50 UTCApr 30, 20:15 UTC2h 25m
2026-04-30 CSC3919 TFU → SIN Apr 30, 13:50 UTCApr 30, 15:55 UTC2h 5m
2026-04-28 CSC3938 BKK → TFU Apr 28, 18:25 UTCApr 28, 19:25 UTC1h 0m
2026-04-28 CSC3937 TFU → BKK Apr 28, 16:30 UTCApr 28, 17:00 UTC30m
2026-04-27 CSC3938 BKK → TFU Apr 27, 18:15 UTCApr 28, 17:00 UTC22h 45m
2026-04-27 CSC3937 TFU → BKK Apr 27, 16:20 UTCApr 27, 16:55 UTC35m
2026-04-26 CSC3938 BKK → TFU Apr 26, 18:20 UTCApr 27, 16:55 UTC22h 35m
2026-04-26 CSC3937 TFU → BKK Apr 26, 16:35 UTCApr 26, 16:55 UTC20m
2026-04-25 CSC3938 BKK → TFU Apr 25, 18:30 UTCApr 25, 18:55 UTC25m
2026-04-25 CSC3937 TFU → BKK Apr 25, 16:35 UTCApr 25, 17:10 UTC35m
2026-04-24 CSC3938 BKK → TFU Apr 24, 18:15 UTCApr 25, 17:10 UTC22h 55m
2026-04-24 CSC3937 TFU → BKK Apr 24, 16:30 UTCApr 24, 16:50 UTC20m

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

Mode-S 7821FF frequently asked

What is Mode-S code 7821FF?
7821FF is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32KW.
Where is Mode-S 7821FF registered?
Mode-S code 7821FF is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821FF broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821FF, octal 36020777, decimal 7,873,023.
What flights does 7821FF operate?
Mode-S 7821FF has broadcast 11 distinct callsigns, including CSC3938, CSC3937, CSC8237, CSC3920, CSC3919.