Apparatus

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sensors Mode-S transponder

781EFB

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-222X · BOEING 767-300

Hex
781EFB
Octal
36017373
Decimal
7,872,251
Country
CN
Tail
B-222X
Type
B763
No current signal · last broadcast 1d ago
Flights observed
54
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 781EFB.

Country allocation

The ICAO 24-bit address 781EFB 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
CSS7635 SF Airlines 6 2026-05-18
CSS309 SF Airlines 6 2026-04-17
CSS310 SF Airlines 5 2026-04-19
CSS301 SF Airlines 4 2026-04-28
CSS358 SF Airlines 3 2026-05-13
CSS302 SF Airlines 3 2026-04-28
CSS253 - 3 2026-05-20
CSS6804 SF Airlines 2 2026-05-12
CSS364 SF Airlines 2 2026-04-16
CSS363 SF Airlines 2 2026-04-15
CSS357 SF Airlines 2 2026-05-12
CSS254 - 2 2026-05-20
CSS242 - 2 2026-05-15
CSS241 SF Airlines 2 2026-05-15
CSS693U - 1 2026-04-27
CSS6935 - 1 2026-04-23
CSS6864 SF Airlines 1 2026-05-27
CSS6805 SF Airlines 1 2026-04-29
CSS6803 SF Airlines 1 2026-05-13
CSS276 - 1 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 CSS246 - May 28, 08:30 UTCMay 28, 10:55 UTC2h 25m
2026-05-28 CSS245 CAN → DEL May 28, 01:05 UTCMay 28, 06:20 UTC5h 15m
2026-05-27 CSS6864 EHU → CAN May 27, 21:15 UTCMay 27, 21:25 UTC10m
2026-05-20 CSS254 - May 20, 07:35 UTCMay 20, 10:05 UTC2h 30m
2026-05-20 CSS253 - May 20, 05:30 UTCMay 20, 05:50 UTC20m
2026-05-20 CSS253 - May 20, 03:15 UTCMay 20, 03:45 UTC30m
2026-05-18 CSS7635 SHE → EHU May 18, 17:10 UTCMay 18, 17:30 UTC20m
2026-05-17 CSS7635 SHE → EHU May 17, 22:01 UTCMay 18, 17:30 UTC19h 30m
2026-05-17 CSS7635 SHE → EHU May 17, 15:55 UTCMay 17, 22:01 UTC6h 5m
2026-05-15 CSS242 - May 15, 08:20 UTCMay 15, 10:40 UTC2h 20m
2026-05-15 CSS241 CTU → DEL May 15, 03:25 UTCMay 15, 06:15 UTC2h 50m
2026-05-13 CSS6803 SZX → EHU May 13, 17:30 UTCMay 13, 17:50 UTC20m
2026-05-13 CSS358 TPE → SZX May 13, 03:00 UTCMay 13, 03:25 UTC25m
2026-05-13 CSS358 TPE → SZX May 13, 02:00 UTCMay 13, 02:25 UTC25m
2026-05-12 CSS357 SZX → TPE May 12, 22:40 UTCMay 12, 23:50 UTC1h 10m
2026-05-12 CSS6804 EHU → SZX May 12, 20:50 UTCMay 12, 21:01 UTC10m
2026-05-10 CSS242 - May 10, 09:05 UTCMay 10, 11:25 UTC2h 20m
2026-05-09 CSS241 CTU → DEL May 9, 16:45 UTCMay 10, 06:40 UTC13h 55m
2026-05-08 CSS7635 SHE → EHU May 8, 22:10 UTCMay 9, 16:55 UTC18h 45m
2026-05-08 CSS254 - May 8, 07:34 UTCMay 8, 22:15 UTC14h 40m
2026-05-08 CSS253 - May 8, 03:04 UTCMay 8, 05:39 UTC2h 35m
2026-04-29 CSS6805 SZX → EHU Apr 29, 17:15 UTCApr 29, 17:25 UTC10m
2026-04-28 CSS302 SIN → SZX Apr 28, 23:05 UTCApr 28, 23:14 UTC10m
2026-04-28 CSS302 SIN → SZX Apr 28, 19:50 UTCApr 28, 20:10 UTC20m
2026-04-28 CSS301 SZX → SIN Apr 28, 16:55 UTCApr 28, 17:20 UTC25m
2026-04-28 CSS301 SZX → SIN Apr 28, 14:00 UTCApr 28, 14:10 UTC10m
2026-04-28 CSS358 TPE → SZX Apr 28, 02:20 UTCApr 28, 03:40 UTC1h 20m
2026-04-27 CSS357 SZX → TPE Apr 27, 23:00 UTCApr 28, 00:20 UTC1h 20m
2026-04-27 CSS693U - Apr 27, 21:00 UTCApr 27, 21:15 UTC15m
2026-04-27 CSS7635 SHE → EHU Apr 27, 16:10 UTCApr 27, 16:25 UTC15m
2026-04-26 CSS7635 SHE → EHU Apr 26, 17:10 UTCApr 27, 16:25 UTC23h 15m
2026-04-25 CSS276 - Apr 25, 07:25 UTCApr 25, 09:35 UTC2h 10m
2026-04-25 CSS275 XIY → NRT Apr 25, 02:05 UTCApr 25, 05:00 UTC2h 55m
2026-04-24 CSS302 SIN → SZX Apr 24, 08:55 UTCApr 24, 10:10 UTC1h 15m
2026-04-24 CSS301 SZX → SIN Apr 24, 04:45 UTCApr 24, 06:25 UTC1h 40m
2026-04-24 CSS301 SZX → SIN Apr 24, 02:55 UTCApr 24, 03:05 UTC10m
2026-04-23 CSS6935 - Apr 23, 20:55 UTCApr 23, 21:20 UTC25m
2026-04-19 CSS310 KUL → SZX Apr 19, 17:35 UTCApr 19, 17:55 UTC20m
2026-04-19 CSS310 KUL → SZX Apr 19, 14:15 UTCApr 19, 15:40 UTC1h 25m
2026-04-17 CSS309 SZX → KUL Apr 17, 23:50 UTCApr 18, 00:20 UTC30m
2026-04-17 CSS309 SZX → KUL Apr 17, 22:50 UTCApr 17, 23:05 UTC15m
2026-04-17 CSS309 SZX → KUL Apr 17, 20:55 UTCApr 17, 21:10 UTC15m
2026-04-17 CSS310 KUL → SZX Apr 17, 17:45 UTCApr 17, 18:05 UTC20m
2026-04-17 CSS310 KUL → SZX Apr 17, 15:40 UTCApr 17, 15:50 UTC10m
2026-04-17 CSS310 KUL → SZX Apr 17, 14:25 UTCApr 17, 14:55 UTC29m
2026-04-16 CSS309 SZX → KUL Apr 16, 23:20 UTCApr 16, 23:45 UTC25m
2026-04-16 CSS309 SZX → KUL Apr 16, 22:10 UTCApr 16, 23:10 UTC1h 0m
2026-04-16 CSS309 SZX → KUL Apr 16, 20:15 UTCApr 16, 20:25 UTC10m
2026-04-16 CSS364 NRT → SZX Apr 16, 05:39 UTCApr 16, 06:05 UTC25m
2026-04-16 CSS364 NRT → SZX Apr 16, 01:20 UTCApr 16, 02:45 UTC1h 25m

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-222X page for operator, model, and routing details .

Mode-S 781EFB frequently asked

What is Mode-S code 781EFB?
781EFB is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-222X.
Where is Mode-S 781EFB registered?
Mode-S code 781EFB is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781EFB broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781EFB, octal 36017373, decimal 7,872,251.
What flights does 781EFB operate?
Mode-S 781EFB has broadcast 20 distinct callsigns, including CSS7635, CSS309, CSS310, CSS301, CSS358.