Apparatus

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sensors Mode-S transponder

781A7A

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-220H · BOEING 767-300

Hex
781A7A
Octal
36015172
Decimal
7,871,098
Country
CN
Tail
B-220H
Type
B763
No current signal · last broadcast 19h ago
Flights observed
73
Distinct callsigns
20
Country
CN
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S 781A7A.

Country allocation

The ICAO 24-bit address 781A7A 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
CSS241 SF Airlines 6 2026-05-29
CSS237 SF Airlines 6 2026-05-16
CSS7223 SF Airlines 5 2026-05-09
CSS6835 SF Airlines 5 2026-05-09
CSS242 - 4 2026-05-29
CSS231 SF Airlines 4 2026-05-21
CSS364 SF Airlines 3 2026-05-28
CSS363 SF Airlines 3 2026-05-27
CSS238 SF Airlines 3 2026-05-26
CSS173 - 3 2026-04-16
CSS6801 SF Airlines 2 2026-05-18
CSS335 SF Airlines 2 2026-04-30
CSS302 SF Airlines 2 2026-05-01
CSS301 SF Airlines 2 2026-05-01
CSS232 - 2 2026-05-21
CSS174 - 2 2026-04-16
CSS168 SF Airlines 2 2026-04-27
CSS158 SF Airlines 2 2026-04-17
CSS157 SF Airlines 2 2026-04-17
CSS6935 - 1 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CSS242 - May 29, 08:00 UTCMay 29, 10:30 UTC2h 30m
2026-05-29 CSS241 CTU → DEL May 29, 03:40 UTCMay 29, 06:25 UTC2h 45m
2026-05-28 CSS3032 - May 28, 12:10 UTCMay 28, 12:30 UTC20m
2026-05-28 CSS364 NRT → SZX May 28, 01:20 UTCMay 28, 02:45 UTC1h 25m
2026-05-27 CSS363 SZX → NRT May 27, 21:35 UTCMay 27, 23:00 UTC1h 25m
2026-05-27 CSS363 SZX → NRT May 27, 19:10 UTCMay 27, 19:25 UTC15m
2026-05-26 CSS6802 EHU → SZX May 26, 21:49 UTCMay 26, 22:05 UTC15m
2026-05-26 CSS238 MAA → MAA May 26, 01:49 UTCMay 26, 08:39 UTC6h 50m
2026-05-24 CSS242 - May 24, 08:45 UTCMay 24, 11:10 UTC2h 25m
2026-05-24 CSS241 CTU → DEL May 24, 03:45 UTCMay 24, 06:30 UTC2h 45m
2026-05-23 CSS241 CTU → DEL May 23, 06:55 UTCMay 24, 06:30 UTC23h 35m
2026-05-23 CSS238 MAA → MAA May 23, 01:45 UTCMay 23, 08:20 UTC6h 34m
2026-05-21 CSS232 - May 21, 07:55 UTCMay 21, 22:05 UTC14h 10m
2026-05-21 CSS231 CTU → BOM May 21, 04:35 UTCMay 21, 04:55 UTC20m
2026-05-21 CSS231 CTU → BOM May 21, 02:05 UTCMay 21, 02:55 UTC50m
2026-05-18 CSS6801 SZX → EHU May 18, 18:00 UTCMay 18, 18:10 UTC10m
2026-05-18 CSS6842 - May 18, 01:30 UTCMay 18, 01:50 UTC20m
2026-05-16 CSS237 CTU → MAA May 16, 01:35 UTCMay 16, 07:41 UTC6h 6m
2026-05-12 CSS238 MAA → MAA May 12, 02:45 UTCMay 12, 08:00 UTC5h 15m
2026-05-09 CSS6835 SZX → HGH May 9, 21:00 UTCMay 9, 21:09 UTC10m
2026-05-09 CSS7223 HGH → SZX May 9, 18:15 UTCMay 9, 19:10 UTC55m
2026-05-08 CSS6835 SZX → HGH May 8, 21:25 UTCMay 8, 21:35 UTC10m
2026-05-08 CSS7223 HGH → SZX May 8, 18:50 UTCMay 8, 19:15 UTC25m
2026-05-07 CSS6835 SZX → HGH May 7, 21:10 UTCMay 7, 21:20 UTC10m
2026-05-07 CSS7223 HGH → SZX May 7, 18:55 UTCMay 7, 19:20 UTC25m
2026-05-06 CSS6835 SZX → HGH May 6, 20:55 UTCMay 6, 21:05 UTC10m
2026-05-06 CSS7223 HGH → SZX May 6, 18:50 UTCMay 6, 19:15 UTC25m
2026-05-05 CSS6835 SZX → HGH May 5, 20:55 UTCMay 5, 21:10 UTC15m
2026-05-05 CSS7223 HGH → SZX May 5, 18:55 UTCMay 5, 19:20 UTC25m
2026-05-02 CSS6806 EHU → SZX May 2, 21:55 UTCMay 2, 22:15 UTC20m
2026-05-02 CSS6803 SZX → EHU May 2, 17:25 UTCMay 2, 17:40 UTC15m
2026-05-01 CSS302 SIN → SZX May 1, 22:35 UTCMay 1, 22:50 UTC15m
2026-05-01 CSS302 SIN → SZX May 1, 19:30 UTCMay 1, 19:50 UTC20m
2026-05-01 CSS301 SZX → SIN May 1, 16:45 UTCMay 1, 17:15 UTC30m
2026-05-01 CSS301 SZX → SIN May 1, 13:55 UTCMay 1, 14:05 UTC10m
2026-05-01 CSS364 NRT → SZX May 1, 05:55 UTCMay 1, 06:10 UTC15m
2026-05-01 CSS364 NRT → SZX May 1, 01:35 UTCMay 1, 03:05 UTC1h 30m
2026-04-30 CSS363 SZX → NRT Apr 30, 21:15 UTCApr 30, 22:50 UTC1h 35m
2026-04-30 CSS336 - Apr 30, 16:45 UTCApr 30, 16:55 UTC10m
2026-04-30 CSS335 SZX → MAA Apr 30, 07:30 UTCApr 30, 14:20 UTC6h 50m
2026-04-30 CSS335 SZX → MAA Apr 30, 05:00 UTCApr 30, 05:20 UTC20m
2026-04-29 CSS6935 - Apr 29, 22:00 UTCApr 29, 22:25 UTC25m
2026-04-29 CSS242 - Apr 29, 08:15 UTCApr 29, 10:20 UTC2h 6m
2026-04-29 CSS241 CTU → DEL Apr 29, 03:49 UTCApr 29, 06:19 UTC2h 30m
2026-04-28 CSS241 CTU → DEL Apr 28, 06:55 UTCApr 29, 06:19 UTC23h 25m
2026-04-28 CSS237 CTU → MAA Apr 28, 02:00 UTCApr 28, 08:25 UTC6h 25m
2026-04-27 CSS168 HAN → EHU Apr 27, 02:35 UTCApr 28, 02:30 UTC23h 55m
2026-04-27 CSS168 HAN → EHU Apr 27, 01:15 UTCApr 27, 03:35 UTC2h 20m
2026-04-26 CSS167 - Apr 26, 20:35 UTCApr 26, 22:55 UTC2h 20m
2026-04-25 CSS237 CTU → MAA Apr 25, 01:30 UTCApr 25, 08:20 UTC6h 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-220H page for operator, model, and routing details .

Mode-S 781A7A frequently asked

What is Mode-S code 781A7A?
781A7A is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-220H.
Where is Mode-S 781A7A registered?
Mode-S code 781A7A is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781A7A broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781A7A, octal 36015172, decimal 7,871,098.
What flights does 781A7A operate?
Mode-S 781A7A has broadcast 20 distinct callsigns, including CSS241, CSS237, CSS7223, CSS6835, CSS242.