Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 16d ago
Flights observed
116
Distinct callsigns
20
Country
CN
Last broadcast
16d 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 - 20 2026-06-21
CSS128 - 14 2026-06-22
CSS170 - 8 2026-06-24
CSS169 SF Airlines 6 2026-06-03
CSS159 SF Airlines 6 2026-06-06
CSS239 SF Airlines 5 2026-06-06
CSS173 - 4 2026-06-25
CSS158 - 4 2026-06-26
CSS7635 SF Airlines 3 2026-06-12
CSS206 - 3 2026-05-20
CSS167 - 3 2026-05-22
CSS161 - 3 2026-06-23
CSS155 - 3 2026-06-19
CSS6802 SF Airlines 2 2026-06-12
CSS358 SF Airlines 2 2026-05-05
CSS357 SF Airlines 2 2026-05-05
CSS231 SF Airlines 2 2026-04-16
CSS174 - 2 2026-06-25
CSS168 SF Airlines 2 2026-05-23
CSS148 - 2 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-26 CSS158 - Jun 26, 14:05 UTCJun 27, 11:04 UTC21h 0m
2026-06-26 CSS158 - Jun 26, 12:19 UTCJun 27, 11:04 UTC22h 45m
2026-06-25 CSS174 - Jun 25, 20:45 UTCJun 26, 10:10 UTC13h 25m
2026-06-25 CSS173 - Jun 25, 15:54 UTCJun 25, 18:34 UTC2h 40m
2026-06-24 CSS173 - Jun 24, 20:14 UTCJun 25, 18:34 UTC22h 20m
2026-06-24 CSS170 - Jun 24, 16:05 UTCJun 25, 15:59 UTC23h 55m
2026-06-24 CSS170 - Jun 24, 15:05 UTCJun 24, 21:44 UTC6h 40m
2026-06-24 CSS148 - Jun 24, 00:05 UTCJun 24, 21:44 UTC21h 40m
2026-06-23 CSS148 - Jun 23, 23:44 UTCJun 24, 21:44 UTC22h 0m
2026-06-23 CSS161 - Jun 23, 19:44 UTCJun 23, 21:49 UTC2h 5m
2026-06-22 CSS128 - Jun 22, 11:19 UTCJun 22, 17:29 UTC6h 10m
2026-06-21 CSS127 - Jun 21, 23:40 UTCJun 22, 07:40 UTC8h 0m
2026-06-20 CSS156 - Jun 20, 11:44 UTCJun 20, 14:14 UTC2h 30m
2026-06-19 CSS155 - Jun 19, 16:59 UTCJun 20, 10:04 UTC17h 5m
2026-06-19 CSS155 - Jun 19, 12:04 UTCJun 20, 10:04 UTC22h 0m
2026-06-19 CSS155 - Jun 19, 11:09 UTCJun 20, 09:59 UTC22h 50m
2026-06-19 CSS170 - Jun 19, 00:05 UTCJun 19, 18:44 UTC18h 39m
2026-06-18 CSS170 - Jun 18, 23:45 UTCJun 19, 18:44 UTC18h 59m
2026-06-18 CSS170 - Jun 18, 20:05 UTCJun 19, 18:44 UTC22h 39m
2026-06-18 CSS126 - Jun 18, 18:15 UTCJun 19, 17:59 UTC23h 44m
2026-06-17 CSS174 - Jun 17, 17:20 UTCJun 18, 07:10 UTC13h 50m
2026-06-16 CSS173 - Jun 16, 22:00 UTCJun 17, 15:00 UTC17h 0m
2026-06-16 CSS173 - Jun 16, 16:05 UTCJun 17, 15:00 UTC22h 56m
2026-06-16 CSS122 - Jun 16, 15:09 UTCJun 17, 14:00 UTC22h 51m
2026-06-16 CSS121 - Jun 16, 05:10 UTCJun 16, 12:45 UTC7h 35m
2026-06-12 CSS7224 SZX → HGH Jun 12, 23:35 UTCJun 12, 23:45 UTC10m
2026-06-12 CSS6802 EHU → SZX Jun 12, 21:00 UTCJun 12, 21:15 UTC15m
2026-06-12 CSS7635 SHE → EHU Jun 12, 16:20 UTCJun 12, 16:35 UTC15m
2026-06-09 CSS128 BUD → ABA Jun 9, 18:35 UTCJun 10, 00:40 UTC6h 5m
2026-06-09 CSS127 - Jun 9, 14:50 UTCJun 9, 15:20 UTC30m
2026-06-08 CSS128 - Jun 8, 12:05 UTCJun 9, 07:35 UTC19h 30m
2026-06-07 CSS127 - Jun 7, 12:05 UTCJun 8, 07:50 UTC19h 45m
2026-06-07 CSS127 - Jun 7, 10:40 UTCJun 8, 07:50 UTC21h 10m
2026-06-06 CSS239 ZUH → DEL Jun 6, 20:45 UTCJun 7, 09:10 UTC12h 25m
2026-06-06 CSS159 EHU → DEL Jun 6, 16:30 UTCJun 6, 18:35 UTC2h 5m
2026-06-05 CSS159 EHU → DEL Jun 5, 22:20 UTCJun 6, 18:35 UTC20h 15m
2026-06-05 CSS122 OSL → DAC Jun 5, 15:15 UTCJun 5, 22:45 UTC7h 30m
2026-06-05 CSS121 KGF → KGF Jun 5, 05:20 UTCJun 5, 13:05 UTC7h 45m
2026-06-03 CSS169 EHU → MAA Jun 3, 13:50 UTCJun 3, 20:55 UTC7h 5m
2026-06-02 CSS169 EHU → MAA Jun 2, 23:05 UTCJun 3, 20:55 UTC21h 50m
2026-06-02 CSS128 - Jun 2, 18:05 UTCJun 3, 15:35 UTC21h 30m
2026-06-02 CSS128 - Jun 2, 17:50 UTCJun 3, 15:35 UTC21h 45m
2026-06-02 CSS127 - Jun 2, 07:05 UTCJun 2, 15:10 UTC8h 5m
2026-06-01 CSS130 - Jun 1, 12:05 UTCJun 2, 07:25 UTC19h 20m
2026-06-01 CSS130 - Jun 1, 10:25 UTCJun 2, 07:25 UTC21h 0m
2026-05-31 CSS127 - May 31, 23:25 UTCJun 1, 07:20 UTC7h 55m
2026-05-30 CSS158 DEL → EHU May 30, 12:05 UTCMay 30, 14:35 UTC2h 30m
2026-05-29 CSS239 ZUH → DEL May 29, 20:55 UTCMay 30, 09:35 UTC12h 40m
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

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 16d 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, CSS170, CSS169, CSS159.