Apparatus

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sensors Mode-S transponder

7821A0

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-226X · BOEING 767-300

Hex
7821A0
Octal
36020640
Decimal
7,872,928
Country
CN
Tail
B-226X
Type
B763
No current signal · last broadcast 2h ago
Flights observed
69
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 7821A0.

Country allocation

The ICAO 24-bit address 7821A0 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
CSS127 - 14 2026-05-28
CSS128 - 9 2026-05-21
CSS169 SF Airlines 4 2026-05-15
CSS159 SF Airlines 4 2026-05-29
CSS239 SF Airlines 3 2026-05-27
CSS206 - 3 2026-05-20
CSS170 - 3 2026-04-29
CSS167 - 3 2026-05-22
CSS7635 SF Airlines 2 2026-05-25
CSS358 SF Airlines 2 2026-05-05
CSS357 SF Airlines 2 2026-05-05
CSS240 - 2 2026-05-29
CSS231 SF Airlines 2 2026-04-16
CSS168 SF Airlines 2 2026-05-23
CSS161 SF Airlines 2 2026-05-14
CSS7104 SF Airlines 1 2026-04-18
CSS6840 SF Airlines 1 2026-05-05
CSS6805 SF Airlines 1 2026-05-11
CSS6803 SF Airlines 1 2026-05-05
CSS6802 SF Airlines 1 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CSS240 - May 29, 20:55 UTCMay 29, 22:45 UTC1h 50m
2026-05-29 CSS159 EHU → DEL May 29, 15:30 UTCMay 29, 18:15 UTC2h 45m
2026-05-28 CSS159 EHU → DEL May 28, 23:35 UTCMay 29, 18:15 UTC18h 40m
2026-05-28 CSS159 EHU → DEL May 28, 20:05 UTCMay 29, 18:15 UTC22h 11m
2026-05-28 CSS127 - May 28, 07:25 UTCMay 28, 14:55 UTC7h 30m
2026-05-27 CSS127 - May 27, 18:05 UTCMay 28, 14:55 UTC20h 50m
2026-05-27 CSS160 DEL → EHU May 27, 17:25 UTCMay 28, 14:55 UTC21h 30m
2026-05-27 CSS239 ZUH → DEL May 27, 02:44 UTCMay 27, 14:55 UTC12h 10m
2026-05-26 CSS163 EHU → DEL May 26, 21:29 UTCMay 27, 00:10 UTC2h 40m
2026-05-25 CSS7635 SHE → EHU May 25, 16:30 UTCMay 25, 16:45 UTC15m
2026-05-23 CSS168 HAN → EHU May 23, 00:40 UTCMay 23, 02:40 UTC1h 59m
2026-05-22 CSS167 - May 22, 20:25 UTCMay 22, 23:05 UTC2h 40m
2026-05-21 CSS128 - May 21, 14:35 UTCMay 21, 16:50 UTC2h 15m
2026-05-20 CSS206 - May 20, 16:50 UTCMay 21, 11:55 UTC19h 5m
2026-05-20 CSS127 - May 20, 05:55 UTCMay 20, 14:10 UTC8h 15m
2026-05-17 CSS128 - May 17, 17:01 UTCMay 17, 22:50 UTC5h 50m
2026-05-16 CSS206 BUD → BUD May 16, 18:55 UTCMay 17, 13:35 UTC18h 40m
2026-05-16 CSS127 - May 16, 08:01 UTCMay 16, 16:10 UTC8h 10m
2026-05-15 CSS127 - May 15, 18:15 UTCMay 16, 16:10 UTC21h 56m
2026-05-15 CSS127 - May 15, 17:30 UTCMay 16, 16:00 UTC22h 31m
2026-05-15 CSS169 EHU → MAA May 15, 12:05 UTCMay 16, 11:21 UTC23h 15m
2026-05-15 CSS169 EHU → MAA May 15, 11:20 UTCMay 16, 08:26 UTC21h 5m
2026-05-15 CSS162 DEL → EHU May 15, 01:35 UTCMay 15, 19:15 UTC17h 39m
2026-05-14 CSS161 EHU → DEL May 14, 21:00 UTCMay 14, 23:10 UTC2h 10m
2026-05-14 CSS161 EHU → DEL May 14, 00:05 UTCMay 14, 23:10 UTC23h 5m
2026-05-13 CSS128 - May 13, 23:50 UTCMay 14, 22:00 UTC22h 10m
2026-05-13 CSS128 - May 13, 18:45 UTCMay 14, 00:40 UTC5h 55m
2026-05-13 CSS127 - May 13, 15:20 UTCMay 13, 15:35 UTC15m
2026-05-13 CSS127 - May 13, 07:10 UTCMay 13, 11:05 UTC3h 55m
2026-05-11 CSS6805 SZX → EHU May 11, 17:05 UTCMay 11, 17:20 UTC15m
2026-05-10 CSS6802 EHU → SZX May 10, 21:49 UTCMay 10, 21:59 UTC10m
2026-05-10 CSS158 DEL → EHU May 10, 10:40 UTCMay 10, 12:54 UTC2h 15m
2026-05-10 CSS239 ZUH → DEL May 10, 06:04 UTCMay 10, 08:54 UTC2h 50m
2026-05-10 CSS239 ZUH → DEL May 10, 03:40 UTCMay 10, 03:55 UTC15m
2026-05-09 CSS240 - May 9, 20:30 UTCMay 9, 22:49 UTC2h 20m
2026-05-09 CSS159 EHU → DEL May 9, 00:55 UTCMay 9, 18:55 UTC18h 0m
2026-05-08 CSS167 - May 8, 20:15 UTCMay 8, 23:05 UTC2h 50m
2026-05-05 CSS6803 SZX → EHU May 5, 17:30 UTCMay 5, 17:40 UTC10m
2026-05-05 CSS358 TPE → SZX May 5, 06:40 UTCMay 5, 07:00 UTC20m
2026-05-05 CSS358 TPE → SZX May 5, 05:30 UTCMay 5, 06:00 UTC30m
2026-05-05 CSS357 SZX → TPE May 5, 03:00 UTCMay 5, 03:35 UTC35m
2026-05-05 CSS357 SZX → TPE May 5, 02:10 UTCMay 5, 02:20 UTC10m
2026-05-05 CSS6840 WUX → SZX May 5, 00:10 UTCMay 5, 00:20 UTC10m
2026-04-30 CSS7635 SHE → EHU Apr 30, 16:10 UTCApr 30, 16:20 UTC10m
2026-04-29 CSS170 - Apr 29, 18:05 UTCApr 30, 16:20 UTC22h 15m
2026-04-29 CSS170 - Apr 29, 11:15 UTCApr 29, 18:40 UTC7h 25m
2026-04-28 CSS169 EHU → MAA Apr 28, 18:05 UTCApr 29, 18:00 UTC23h 56m
2026-04-28 CSS128 - Apr 28, 16:25 UTCApr 29, 12:50 UTC20h 25m
2026-04-28 CSS127 - Apr 28, 12:30 UTCApr 28, 13:10 UTC40m
2026-04-26 CSS169 EHU → MAA Apr 26, 10:55 UTCApr 26, 18:45 UTC7h 50m

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-226X page for operator, model, and routing details .

Mode-S 7821A0 frequently asked

What is Mode-S code 7821A0?
7821A0 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-226X.
Where is Mode-S 7821A0 registered?
Mode-S code 7821A0 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821A0 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821A0, octal 36020640, decimal 7,872,928.
What flights does 7821A0 operate?
Mode-S 7821A0 has broadcast 20 distinct callsigns, including CSS127, CSS128, CSS169, CSS159, CSS239.