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 Jul 26, 22:45 UTC
Flights observed
125
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 22:45 UTC

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
CSS364 - 6 2026-06-13
CSS363 SF Airlines 6 2026-06-12
CSS358 SF Airlines 6 2026-07-22
CSS309 SF Airlines 6 2026-04-17
CSS6804 - 5 2026-07-21
CSS357 SF Airlines 5 2026-07-21
CSS310 SF Airlines 5 2026-04-19
CSS301 SF Airlines 4 2026-04-28
CSS242 - 4 2026-07-24
CSS241 SF Airlines 4 2026-07-24
CSS6803 - 3 2026-07-19
CSS302 SF Airlines 3 2026-04-28
CSS275 SF Airlines 3 2026-07-25
CSS253 - 3 2026-05-20
CSS238 - 3 2026-06-23
CSS7223 - 2 2026-06-19
CSS6864 - 2 2026-07-09
CSS6802 - 2 2026-06-27
CSS6801 SF Airlines 2 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSS167 - Jul 26, 20:05 UTCJul 26, 22:45 UTC2h 40m
2026-07-25 CSS276 - Jul 25, 07:30 UTCJul 25, 09:35 UTC2h 5m
2026-07-25 CSS275 XIY → NRT Jul 25, 01:50 UTCJul 25, 05:10 UTC3h 20m
2026-07-24 CSS275 XIY → NRT Jul 24, 08:50 UTCJul 25, 05:10 UTC20h 20m
2026-07-24 CSS242 - Jul 24, 06:50 UTCJul 25, 05:10 UTC22h 20m
2026-07-24 CSS241 CTU → DEL Jul 24, 02:15 UTCJul 24, 05:05 UTC2h 50m
2026-07-22 CSS6801 SZX → EHU Jul 22, 17:40 UTCJul 22, 17:50 UTC10m
2026-07-22 CSS314 - Jul 22, 14:00 UTCJul 22, 14:15 UTC15m
2026-07-22 CSS314 - Jul 22, 11:55 UTCJul 22, 13:25 UTC1h 30m
2026-07-22 CSS313 SZX → BKK Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 CSS358 TPE → SZX Jul 22, 02:10 UTCJul 22, 03:25 UTC1h 15m
2026-07-21 CSS357 SZX → TPE Jul 21, 22:30 UTCJul 21, 23:55 UTC1h 25m
2026-07-21 CSS6804 - Jul 21, 20:35 UTCJul 21, 20:45 UTC10m
2026-07-21 CSS258 - Jul 21, 07:15 UTCJul 21, 08:15 UTC1h 0m
2026-07-21 CSS257 - Jul 21, 04:00 UTCJul 21, 05:25 UTC1h 25m
2026-07-19 CSS6803 - Jul 19, 17:40 UTCJul 19, 17:55 UTC15m
2026-07-17 CSS122 OSL → DAC Jul 17, 15:00 UTCJul 17, 16:34 UTC1h 35m
2026-07-16 CSS170 - Jul 16, 16:05 UTCJul 17, 12:45 UTC20h 40m
2026-07-16 CSS170 - Jul 16, 10:50 UTCJul 17, 06:05 UTC19h 15m
2026-07-15 CSS169 - Jul 15, 18:00 UTCJul 16, 16:44 UTC22h 45m
2026-07-14 CSS148 - Jul 14, 23:55 UTCJul 15, 17:55 UTC18h 0m
2026-07-14 CSS161 - Jul 14, 19:10 UTCJul 14, 21:45 UTC2h 35m
2026-07-09 CSS6864 - Jul 9, 21:35 UTCJul 9, 21:45 UTC10m
2026-07-08 CSS6801 SZX → EHU Jul 8, 17:35 UTCJul 8, 17:55 UTC20m
2026-07-08 CSS358 - Jul 8, 02:30 UTCJul 8, 04:05 UTC1h 35m
2026-07-07 CSS357 - Jul 7, 23:15 UTCJul 8, 00:40 UTC1h 25m
2026-07-07 CSS6804 - Jul 7, 21:15 UTCJul 7, 21:30 UTC15m
2026-07-07 CSS156 - Jul 7, 11:55 UTCJul 7, 15:20 UTC3h 25m
2026-07-07 CSS155 - Jul 7, 07:00 UTCJul 7, 10:00 UTC3h 0m
2026-07-06 CSS155 - Jul 6, 10:50 UTCJul 7, 10:00 UTC23h 10m
2026-07-06 CSS128 - Jul 6, 10:35 UTCJul 7, 08:35 UTC22h 0m
2026-07-05 CSS127 - Jul 5, 23:40 UTCJul 6, 07:10 UTC7h 30m
2026-07-04 CSS256 - Jul 4, 09:15 UTCJul 4, 11:30 UTC2h 15m
2026-07-04 CSS255 - Jul 4, 04:30 UTCJul 4, 07:45 UTC3h 15m
2026-07-02 CSS248 - Jul 2, 09:05 UTCJul 2, 12:40 UTC3h 35m
2026-07-02 CSS247 - Jul 2, 06:41 UTCJul 2, 06:55 UTC15m
2026-07-01 CSS258 - Jul 1, 07:05 UTCJul 1, 08:15 UTC1h 10m
2026-06-30 CSS257 - Jun 30, 17:50 UTCJul 1, 05:10 UTC11h 20m
2026-06-30 CSS358 - Jun 30, 02:20 UTCJun 30, 03:40 UTC1h 20m
2026-06-29 CSS357 - Jun 29, 22:55 UTCJun 30, 00:09 UTC1h 15m
2026-06-29 CSS6804 - Jun 29, 20:49 UTCJun 29, 21:05 UTC15m
2026-06-28 CSS6839 - Jun 28, 02:29 UTCJun 28, 02:44 UTC15m
2026-06-27 CSS6802 - Jun 27, 21:04 UTCJun 27, 21:19 UTC15m
2026-06-26 CSS128 - Jun 26, 18:20 UTCJun 27, 00:05 UTC5h 45m
2026-06-26 CSS127 - Jun 26, 14:35 UTCJun 26, 15:25 UTC50m
2026-06-23 CSS238 - Jun 23, 01:30 UTCJun 23, 08:20 UTC6h 50m
2026-06-19 CSS6835 - Jun 19, 20:59 UTCJun 19, 21:09 UTC10m
2026-06-19 CSS7223 - Jun 19, 18:49 UTCJun 19, 19:04 UTC15m
2026-06-15 CSS232 - Jun 15, 07:10 UTCJun 15, 10:00 UTC2h 50m
2026-06-15 CSS231 - Jun 15, 04:25 UTCJun 15, 04:34 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-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 Jul 26, 22:45 UTC.
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, CSS364, CSS363, CSS358, CSS309.