Apparatus

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sensors Mode-S transponder

781E9B

ICAO 24-bit transponder address · allocated to China

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

Hex
781E9B
Octal
36017233
Decimal
7,872,155
Country
CN
Tail
B-222Q
Type
B763
No current signal · last broadcast 2h ago
Flights observed
111
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 781E9B.

Country allocation

The ICAO 24-bit address 781E9B 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
CSS168 - 7 2026-07-13
CSS398 - 5 2026-05-30
CSS301 SF Airlines 5 2026-05-30
CSS239 SF Airlines 5 2026-06-28
CSS127 - 5 2026-06-10
CSS6804 SF Airlines 4 2026-05-27
CSS173 - 4 2026-07-01
CSS167 - 4 2026-07-12
CSS160 SF Airlines 4 2026-04-22
CSS159 - 4 2026-06-28
CSS128 - 4 2026-06-11
CSS7103 - 3 2026-07-10
CSS6803 - 3 2026-07-11
CSS6801 SF Airlines 3 2026-07-07
CSS358 SF Airlines 3 2026-05-07
CSS357 SF Airlines 3 2026-05-06
CSS253 - 3 2026-04-17
CSS240 - 3 2026-06-25
CSS231 SF Airlines 3 2026-06-01
CSS155 - 3 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSS237 - Jul 13, 08:01 UTCJul 14, 06:45 UTC22h 45m
2026-07-13 CSS168 - Jul 13, 00:05 UTCJul 13, 04:00 UTC3h 55m
2026-07-12 CSS167 - Jul 12, 19:45 UTCJul 12, 22:30 UTC2h 45m
2026-07-11 CSS6803 - Jul 11, 17:20 UTCJul 11, 17:40 UTC20m
2026-07-10 CSS6806 - Jul 10, 21:45 UTCJul 10, 22:05 UTC20m
2026-07-10 CSS7103 - Jul 10, 17:25 UTCJul 10, 17:35 UTC10m
2026-07-07 CSS6801 SZX → EHU Jul 7, 17:05 UTCJul 7, 17:15 UTC10m
2026-07-06 CSS6806 - Jul 6, 22:25 UTCJul 6, 22:40 UTC15m
2026-07-04 CSS7103 - Jul 4, 19:30 UTCJul 4, 19:50 UTC20m
2026-07-03 CSS7103 - Jul 3, 17:10 UTCJul 3, 17:25 UTC15m
2026-07-01 CSS174 - Jul 1, 12:50 UTCJul 1, 16:00 UTC3h 10m
2026-07-01 CSS173 - Jul 1, 10:35 UTCJul 1, 10:55 UTC20m
2026-06-30 CSS173 - Jun 30, 15:05 UTCJul 1, 10:00 UTC18h 55m
2026-06-30 CSS121 - Jun 30, 04:55 UTCJun 30, 13:15 UTC8h 20m
2026-06-29 CSS148 - Jun 29, 14:50 UTCJun 30, 13:15 UTC22h 25m
2026-06-29 CSS148 - Jun 29, 13:49 UTCJun 30, 12:45 UTC22h 56m
2026-06-28 CSS239 ZUH → DEL Jun 28, 20:54 UTCJun 29, 11:29 UTC14h 35m
2026-06-28 CSS159 - Jun 28, 15:44 UTCJun 28, 18:29 UTC2h 45m
2026-06-27 CSS155 - Jun 27, 16:10 UTCJun 27, 18:54 UTC2h 45m
2026-06-27 CSS168 - Jun 27, 07:19 UTCJun 27, 07:45 UTC25m
2026-06-27 CSS168 - Jun 27, 00:10 UTCJun 27, 04:09 UTC4h 0m
2026-06-26 CSS167 - Jun 26, 20:10 UTCJun 26, 22:10 UTC2h 0m
2026-06-25 CSS148 - Jun 25, 14:14 UTCJun 25, 16:35 UTC2h 20m
2026-06-25 CSS239 ZUH → DEL Jun 25, 08:09 UTCJun 25, 12:15 UTC4h 5m
2026-06-25 CSS240 - Jun 25, 00:09 UTCJun 25, 04:10 UTC4h 0m
2026-06-24 CSS161 - Jun 24, 12:20 UTCJun 24, 22:14 UTC9h 55m
2026-06-24 CSS168 - Jun 24, 05:59 UTCJun 24, 09:59 UTC4h 0m
2026-06-23 CSS167 - Jun 23, 16:24 UTCJun 24, 03:55 UTC11h 30m
2026-06-23 CSS239 ZUH → DEL Jun 23, 08:39 UTCJun 23, 13:29 UTC4h 50m
2026-06-23 CSS240 - Jun 23, 00:04 UTCJun 23, 03:54 UTC3h 50m
2026-06-22 CSS161 - Jun 22, 20:10 UTCJun 22, 22:15 UTC2h 5m
2026-06-21 CSS170 - Jun 21, 11:40 UTCJun 21, 18:44 UTC7h 5m
2026-06-13 CSS168 HAN → EHU Jun 13, 07:10 UTCJun 13, 07:30 UTC20m
2026-06-13 CSS168 HAN → EHU Jun 13, 04:35 UTCJun 13, 04:45 UTC10m
2026-06-13 CSS168 HAN → EHU Jun 13, 00:45 UTCJun 13, 03:55 UTC3h 10m
2026-06-12 CSS167 - Jun 12, 19:45 UTCJun 12, 22:40 UTC2h 55m
2026-06-11 CSS128 - Jun 11, 14:35 UTCJun 11, 20:35 UTC6h 0m
2026-06-10 CSS206 BUD → BUD Jun 10, 16:55 UTCJun 11, 12:15 UTC19h 20m
2026-06-10 CSS127 - Jun 10, 06:25 UTCJun 10, 13:55 UTC7h 30m
2026-06-09 CSS238 MAA → MAA Jun 9, 06:50 UTCJun 10, 06:45 UTC23h 55m
2026-06-09 CSS238 MAA → MAA Jun 9, 01:45 UTCJun 9, 07:55 UTC6h 10m
2026-06-01 CSS232 - Jun 1, 06:50 UTCJun 1, 09:35 UTC2h 45m
2026-06-01 CSS231 CTU → BOM Jun 1, 04:30 UTCJun 1, 04:45 UTC15m
2026-06-01 CSS231 CTU → BOM Jun 1, 01:55 UTCJun 1, 02:45 UTC50m
2026-05-31 CSS6803 SZX → EHU May 31, 17:30 UTCMay 31, 17:40 UTC10m
2026-05-30 CSS398 - May 30, 19:20 UTCMay 30, 22:05 UTC2h 45m
2026-05-30 CSS301 SZX → SIN May 30, 16:45 UTCMay 30, 16:55 UTC10m
2026-05-30 CSS301 SZX → SIN May 30, 14:00 UTCMay 30, 14:10 UTC10m
2026-05-30 CSS398 - May 30, 02:00 UTCMay 30, 02:20 UTC20m
2026-05-29 CSS398 - May 29, 20:35 UTCMay 29, 23:25 UTC2h 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-222Q page for operator, model, and routing details .

Mode-S 781E9B frequently asked

What is Mode-S code 781E9B?
781E9B is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-222Q.
Where is Mode-S 781E9B registered?
Mode-S code 781E9B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E9B broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E9B, octal 36017233, decimal 7,872,155.
What flights does 781E9B operate?
Mode-S 781E9B has broadcast 20 distinct callsigns, including CSS168, CSS398, CSS301, CSS239, CSS127.