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sensors Mode-S transponder

7821C8

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-227C · BOEING 737 MAX 8

Hex
7821C8
Octal
36020710
Decimal
7,872,968
Country
CN
Tail
B-227C
Type
B38M
No current signal · last broadcast Jul 25, 18:20 UTC
Flights observed
186
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 18:20 UTC

Last known position

Most recent position reported by Mode-S 7821C8.

Country allocation

The ICAO 24-bit address 7821C8 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
CXA855 Xiamen Airlines 44 2026-07-19
CXA856 Xiamen Airlines 24 2026-07-20
CXA837 - 22 2026-07-25
CXA838 - 20 2026-07-25
CXA867 - 13 2026-07-09
CXA892 Xiamen Airlines 11 2026-07-24
CXA868 - 11 2026-07-09
CXA8842 - 4 2026-06-26
CXA865 - 4 2026-06-17
CXA8841 - 3 2026-06-25
CXA878 Xiamen Airlines 3 2026-07-18
CXA891 Xiamen Airlines 2 2026-07-22
CXA866 - 2 2026-06-17
CXA8371 - 2 2026-07-03
CXA8042 Xiamen Airlines 2 2026-05-27
CXA8032 Xiamen Airlines 2 2026-07-25
CXA877 - 1 2026-07-18
CXA8645 - 1 2026-07-08
CXA854 Xiamen Airlines 1 2026-05-09
CXA8536 - 1 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CXA838 - Jul 25, 16:50 UTCJul 25, 18:20 UTC1h 30m
2026-07-25 CXA837 - Jul 25, 14:55 UTCJul 25, 15:15 UTC20m
2026-07-25 CXA837 - Jul 25, 10:35 UTCJul 25, 13:35 UTC3h 0m
2026-07-25 CXA8032 SHE → XMN Jul 25, 00:55 UTCJul 25, 07:40 UTC6h 45m
2026-07-24 CXA892 DPS → XMN Jul 24, 11:45 UTCJul 24, 22:20 UTC10h 35m
2026-07-23 CXA892 DPS → XMN Jul 23, 18:20 UTCJul 24, 08:10 UTC13h 50m
2026-07-23 CXA892 DPS → XMN Jul 23, 12:40 UTCJul 24, 08:10 UTC19h 30m
2026-07-22 CXA891 XMN → DPS Jul 22, 18:05 UTCJul 23, 13:15 UTC19h 10m
2026-07-22 CXA838 - Jul 22, 16:50 UTCJul 23, 13:15 UTC20h 25m
2026-07-22 CXA837 - Jul 22, 14:55 UTCJul 22, 15:10 UTC15m
2026-07-21 CXA892 DPS → XMN Jul 21, 18:15 UTCJul 22, 13:30 UTC19h 15m
2026-07-21 CXA892 DPS → XMN Jul 21, 05:45 UTCJul 21, 20:55 UTC15h 10m
2026-07-20 CXA856 CGK → FOC Jul 20, 00:05 UTCJul 20, 01:30 UTC1h 25m
2026-07-19 CXA855 FOC → CGK Jul 19, 17:05 UTCJul 19, 17:20 UTC15m
2026-07-19 CXA855 FOC → CGK Jul 19, 12:45 UTCJul 19, 15:40 UTC2h 55m
2026-07-18 CXA878 ICN → FOC Jul 18, 11:50 UTCJul 18, 12:15 UTC25m
2026-07-18 CXA877 - Jul 18, 04:50 UTCJul 18, 09:30 UTC4h 40m
2026-07-18 CXA856 CGK → FOC Jul 18, 00:10 UTCJul 18, 01:34 UTC1h 25m
2026-07-17 CXA855 - Jul 17, 17:09 UTCJul 17, 17:30 UTC20m
2026-07-17 CXA855 - Jul 17, 12:50 UTCJul 17, 15:44 UTC2h 55m
2026-07-16 CXA878 - Jul 16, 11:45 UTCJul 16, 12:09 UTC25m
2026-07-16 CXA856 - Jul 16, 00:20 UTCJul 16, 09:40 UTC9h 20m
2026-07-15 CXA855 - Jul 15, 16:25 UTCJul 15, 16:40 UTC15m
2026-07-15 CXA855 - Jul 15, 12:15 UTCJul 15, 15:05 UTC2h 50m
2026-07-13 CXA878 - Jul 13, 11:45 UTCJul 13, 12:15 UTC30m
2026-07-13 CXA856 - Jul 13, 00:20 UTCJul 13, 09:40 UTC9h 20m
2026-07-12 CXA855 - Jul 12, 16:30 UTCJul 12, 16:45 UTC15m
2026-07-12 CXA855 - Jul 12, 12:20 UTCJul 12, 15:10 UTC2h 50m
2026-07-09 CXA868 - Jul 9, 06:40 UTCJul 9, 08:10 UTC1h 30m
2026-07-09 CXA867 - Jul 9, 04:50 UTCJul 9, 05:10 UTC20m
2026-07-08 CXA838 - Jul 8, 16:50 UTCJul 9, 03:20 UTC10h 30m
2026-07-08 CXA837 - Jul 8, 15:10 UTCJul 8, 15:30 UTC20m
2026-07-08 CXA837 - Jul 8, 12:55 UTCJul 8, 13:40 UTC45m
2026-07-08 CXA8645 - Jul 8, 02:10 UTCJul 8, 02:20 UTC10m
2026-07-06 CXA838 - Jul 6, 17:35 UTCJul 7, 09:25 UTC15h 50m
2026-07-06 CXA837 - Jul 6, 15:45 UTCJul 6, 16:00 UTC15m
2026-07-06 CXA837 - Jul 6, 02:10 UTCJul 6, 14:15 UTC12h 5m
2026-07-05 CXA838 - Jul 5, 21:45 UTCJul 5, 21:55 UTC10m
2026-07-05 CXA838 - Jul 5, 17:10 UTCJul 5, 18:35 UTC1h 25m
2026-07-05 CXA837 - Jul 5, 15:15 UTCJul 5, 15:30 UTC15m
2026-07-05 CXA837 - Jul 5, 02:50 UTCJul 5, 13:40 UTC10h 50m
2026-07-04 CXA8359 - Jul 4, 10:45 UTCJul 4, 11:10 UTC25m
2026-07-03 CXA8317 - Jul 3, 13:45 UTCJul 3, 14:10 UTC25m
2026-07-03 CXA8371 - Jul 3, 02:30 UTCJul 3, 02:55 UTC25m
2026-07-02 CXA856 - Jul 2, 00:35 UTCJul 2, 02:05 UTC1h 30m
2026-07-01 CXA855 - Jul 1, 16:20 UTCJul 1, 16:35 UTC15m
2026-07-01 CXA855 - Jul 1, 14:10 UTCJul 1, 14:55 UTC45m
2026-06-30 CXA856 - Jun 30, 01:04 UTCJun 30, 02:35 UTC1h 31m
2026-06-29 CXA855 - Jun 29, 16:15 UTCJun 29, 16:29 UTC15m
2026-06-29 CXA855 - Jun 29, 13:59 UTCJun 29, 14:44 UTC45m

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-227C page for operator, model, and routing details .

Mode-S 7821C8 frequently asked

What is Mode-S code 7821C8?
7821C8 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-227C.
Where is Mode-S 7821C8 registered?
Mode-S code 7821C8 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821C8 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 18:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821C8, octal 36020710, decimal 7,872,968.
What flights does 7821C8 operate?
Mode-S 7821C8 has broadcast 20 distinct callsigns, including CXA855, CXA856, CXA837, CXA838, CXA867.