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sensors Mode-S transponder

78221B

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-227F · BOEING 737-800

Hex
78221B
Octal
36021033
Decimal
7,873,051
Country
CN
Tail
B-227F
Type
B738
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
51
Distinct callsigns
18
Country
CN
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S 78221B.

Country allocation

The ICAO 24-bit address 78221B 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 18 distinct

Callsign Airline Flights Last seen
CSS6807 - 10 2026-07-14
CSS7109 SF Airlines 6 2026-07-24
CSS6808 - 6 2026-07-15
CSS7110 SF Airlines 5 2026-07-24
CSS6814 - 4 2026-07-03
CSS6802 SF Airlines 4 2026-07-20
CSS6810 - 2 2026-07-26
CSS6805 - 2 2026-07-04
CSS6804 - 2 2026-07-04
CSS6803 - 2 2026-07-16
CSS711Y - 1 2026-07-25
CSS7088 - 1 2026-06-20
CSS6831 - 1 2026-04-17
CSS6813 - 1 2026-07-02
CSS6809 - 1 2026-06-04
CSS6806 SF Airlines 1 2026-05-16
CSS3014 - 1 2026-07-10
CSS3001 - 1 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSS6810 - Jul 26, 21:25 UTCJul 26, 21:40 UTC15m
2026-07-25 CSS711Y - Jul 25, 16:35 UTCJul 25, 16:55 UTC20m
2026-07-24 CSS7110 SZX → PEK Jul 24, 23:20 UTCJul 24, 23:55 UTC35m
2026-07-24 CSS7110 SZX → PEK Jul 24, 21:30 UTCJul 24, 21:40 UTC10m
2026-07-24 CSS7109 PEK → SZX Jul 24, 19:10 UTCJul 24, 19:25 UTC15m
2026-07-24 CSS7109 PEK → SZX Jul 24, 16:35 UTCJul 24, 17:20 UTC45m
2026-07-23 CSS7110 SZX → PEK Jul 23, 21:40 UTCJul 23, 21:50 UTC10m
2026-07-23 CSS7109 PEK → SZX Jul 23, 18:55 UTCJul 23, 19:15 UTC20m
2026-07-23 CSS7109 PEK → SZX Jul 23, 16:20 UTCJul 23, 16:40 UTC20m
2026-07-22 CSS7110 SZX → PEK Jul 22, 21:55 UTCJul 22, 22:05 UTC10m
2026-07-22 CSS7109 PEK → SZX Jul 22, 19:15 UTCJul 22, 19:25 UTC10m
2026-07-22 CSS7109 PEK → SZX Jul 22, 16:35 UTCJul 22, 16:55 UTC20m
2026-07-21 CSS7110 SZX → PEK Jul 21, 21:40 UTCJul 21, 21:55 UTC15m
2026-07-20 CSS6802 EHU → SZX Jul 20, 21:00 UTCJul 20, 21:25 UTC25m
2026-07-16 CSS6803 - Jul 16, 16:55 UTCJul 16, 17:05 UTC10m
2026-07-15 CSS6808 - Jul 15, 03:05 UTCJul 15, 03:20 UTC15m
2026-07-14 CSS6807 - Jul 14, 19:45 UTCJul 14, 19:55 UTC10m
2026-07-10 CSS6802 - Jul 10, 20:50 UTCJul 10, 21:10 UTC20m
2026-07-10 CSS3014 - Jul 10, 03:15 UTCJul 10, 03:25 UTC10m
2026-07-09 CSS6807 - Jul 9, 20:05 UTCJul 9, 20:15 UTC10m
2026-07-09 CSS6808 - Jul 9, 01:10 UTCJul 9, 01:30 UTC20m
2026-07-07 CSS6807 - Jul 7, 19:45 UTCJul 7, 19:55 UTC10m
2026-07-07 CSS6808 - Jul 7, 03:10 UTCJul 7, 03:20 UTC10m
2026-07-04 CSS6804 - Jul 4, 21:25 UTCJul 4, 21:40 UTC15m
2026-07-04 CSS6805 - Jul 4, 16:40 UTCJul 4, 16:50 UTC10m
2026-07-04 CSS6808 - Jul 4, 00:55 UTCJul 4, 01:15 UTC20m
2026-07-03 CSS6807 - Jul 3, 20:00 UTCJul 3, 20:10 UTC10m
2026-07-03 CSS6814 - Jul 3, 01:05 UTCJul 3, 01:15 UTC10m
2026-07-02 CSS6814 - Jul 2, 22:20 UTCJul 2, 22:40 UTC20m
2026-07-02 CSS6813 - Jul 2, 18:35 UTCJul 2, 18:45 UTC10m
2026-07-02 CSS6814 - Jul 2, 01:05 UTCJul 2, 01:25 UTC20m
2026-07-01 CSS6814 - Jul 1, 22:30 UTCJul 1, 22:45 UTC15m
2026-07-01 CSS6808 - Jul 1, 00:30 UTCJul 1, 00:55 UTC25m
2026-06-30 CSS6807 - Jun 30, 19:50 UTCJun 30, 20:00 UTC10m
2026-06-29 CSS6807 - Jun 29, 19:49 UTCJun 29, 20:00 UTC10m
2026-06-26 CSS6807 - Jun 26, 19:55 UTCJun 26, 20:04 UTC10m
2026-06-24 CSS6807 - Jun 24, 19:49 UTCJun 24, 19:59 UTC10m
2026-06-23 CSS6807 - Jun 23, 20:10 UTCJun 23, 20:19 UTC10m
2026-06-23 CSS6808 - Jun 23, 00:30 UTCJun 23, 00:54 UTC25m
2026-06-22 CSS6807 - Jun 22, 19:40 UTCJun 22, 19:49 UTC10m
2026-06-21 CSS6804 - Jun 21, 21:10 UTCJun 21, 21:24 UTC15m
2026-06-21 CSS6805 SZX → EHU Jun 21, 17:05 UTCJun 21, 17:20 UTC15m
2026-06-20 CSS7088 - Jun 20, 00:29 UTCJun 20, 00:39 UTC10m
2026-06-04 CSS6809 - Jun 4, 16:40 UTCJun 4, 16:50 UTC10m
2026-06-03 CSS6810 - Jun 3, 21:20 UTCJun 3, 21:35 UTC15m
2026-05-18 CSS3001 - May 18, 12:55 UTCMay 18, 13:05 UTC10m
2026-05-16 CSS6806 EHU → SZX May 16, 21:00 UTCMay 16, 21:20 UTC20m
2026-04-21 CSS6803 SZX → EHU Apr 21, 17:20 UTCApr 21, 17:30 UTC10m
2026-04-19 CSS6802 EHU → SZX Apr 19, 21:15 UTCApr 19, 21:25 UTC10m
2026-04-17 CSS6831 - Apr 17, 00:40 UTCApr 17, 00:50 UTC10m

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

Mode-S 78221B frequently asked

What is Mode-S code 78221B?
78221B is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-227F.
Where is Mode-S 78221B registered?
Mode-S code 78221B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 78221B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 78221B, octal 36021033, decimal 7,873,051.
What flights does 78221B operate?
Mode-S 78221B has broadcast 18 distinct callsigns, including CSS6807, CSS7109, CSS6808, CSS7110, CSS6814.