Apparatus

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sensors Mode-S transponder

781DF9

ICAO 24-bit transponder address · allocated to China

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

Hex
781DF9
Octal
36016771
Decimal
7,871,993
Country
CN
Tail
B-222D
Type
B763
No current signal · last broadcast 11h ago
Flights observed
65
Distinct callsigns
20
Country
CN
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S 781DF9.

Country allocation

The ICAO 24-bit address 781DF9 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
CSS121 SF Airlines 6 2026-05-12
CSS358 SF Airlines 5 2026-05-19
CSS128 - 5 2026-06-04
CSS357 SF Airlines 4 2026-05-19
CSS127 - 4 2026-06-03
CSS6804 SF Airlines 3 2026-05-18
CSS6801 SF Airlines 3 2026-05-21
CSS155 SF Airlines 3 2026-05-29
CSS122 SF Airlines 3 2026-05-12
CSS363 SF Airlines 2 2026-05-19
CSS301 SF Airlines 2 2026-05-20
CSS239 SF Airlines 2 2026-05-26
CSS206 - 2 2026-06-03
CSS169 SF Airlines 2 2026-05-28
CSS161 SF Airlines 2 2026-05-25
CSS7636 SF Airlines 1 2026-05-07
CSS7103 SF Airlines 1 2026-05-17
CSS6864 SF Airlines 1 2026-04-23
CSS364 SF Airlines 1 2026-05-20
CSS302 SF Airlines 1 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-04 CSS128 - Jun 4, 14:45 UTCJun 4, 16:55 UTC2h 10m
2026-06-03 CSS206 BUD → BUD Jun 3, 17:25 UTCJun 4, 12:10 UTC18h 45m
2026-06-03 CSS127 - Jun 3, 06:15 UTCJun 3, 14:00 UTC7h 45m
2026-05-30 CSS156 LHE → EHU May 30, 11:50 UTCMay 30, 14:50 UTC3h 0m
2026-05-29 CSS155 EHU → LHE May 29, 15:55 UTCMay 30, 09:50 UTC17h 55m
2026-05-29 CSS155 EHU → LHE May 29, 12:20 UTCMay 30, 09:50 UTC21h 30m
2026-05-29 CSS155 EHU → LHE May 29, 10:50 UTCMay 30, 09:50 UTC23h 0m
2026-05-28 CSS169 EHU → MAA May 28, 18:55 UTCMay 29, 17:40 UTC22h 45m
2026-05-28 CSS128 - May 28, 16:20 UTCMay 29, 16:05 UTC23h 45m
2026-05-28 CSS128 - May 28, 15:35 UTCMay 29, 12:40 UTC21h 5m
2026-05-27 CSS205 BUD → BUD May 27, 17:05 UTCMay 28, 11:15 UTC18h 10m
2026-05-27 CSS127 - May 27, 06:09 UTCMay 27, 13:45 UTC7h 35m
2026-05-26 CSS160 DEL → EHU May 26, 14:55 UTCMay 27, 13:45 UTC22h 50m
2026-05-26 CSS239 ZUH → DEL May 26, 09:59 UTCMay 26, 12:40 UTC2h 40m
2026-05-26 - - May 26, 05:45 UTCMay 26, 05:54 UTC10m
2026-05-26 CSS240 - May 26, 01:10 UTCMay 26, 03:35 UTC2h 25m
2026-05-25 CSS161 EHU → DEL May 25, 20:19 UTCMay 25, 23:00 UTC2h 40m
2026-05-24 CSS169 EHU → MAA May 24, 14:15 UTCMay 24, 21:35 UTC7h 20m
2026-05-23 CSS264 - May 23, 10:10 UTCMay 23, 10:40 UTC30m
2026-05-23 CSS263 - May 23, 08:00 UTCMay 23, 08:35 UTC35m
2026-05-21 CSS6801 SZX → EHU May 21, 18:45 UTCMay 21, 18:55 UTC10m
2026-05-21 CSS302 SIN → SZX May 21, 02:00 UTCMay 21, 02:20 UTC20m
2026-05-20 CSS301 SZX → SIN May 20, 23:25 UTCMay 20, 23:45 UTC20m
2026-05-20 CSS301 SZX → SIN May 20, 20:45 UTCMay 20, 20:55 UTC10m
2026-05-20 CSS364 NRT → SZX May 20, 01:40 UTCMay 20, 03:00 UTC1h 20m
2026-05-19 CSS363 SZX → NRT May 19, 22:00 UTCMay 19, 23:25 UTC1h 25m
2026-05-19 CSS363 SZX → NRT May 19, 19:35 UTCMay 19, 19:45 UTC10m
2026-05-19 CSS358 TPE → SZX May 19, 04:05 UTCMay 19, 04:25 UTC20m
2026-05-19 CSS358 TPE → SZX May 19, 03:05 UTCMay 19, 03:30 UTC25m
2026-05-19 CSS357 SZX → TPE May 19, 00:30 UTCMay 19, 01:10 UTC40m
2026-05-18 CSS357 SZX → TPE May 18, 23:40 UTCMay 18, 23:55 UTC15m
2026-05-18 CSS6804 EHU → SZX May 18, 21:30 UTCMay 18, 21:45 UTC15m
2026-05-17 CSS7103 PEK → EHU May 17, 16:50 UTCMay 17, 17:10 UTC20m
2026-05-12 CSS122 OSL → DAC May 12, 15:15 UTCMay 12, 22:01 UTC6h 45m
2026-05-12 CSS121 KGF → KGF May 12, 13:10 UTCMay 12, 13:25 UTC15m
2026-05-12 CSS121 KGF → KGF May 12, 06:05 UTCMay 12, 09:05 UTC3h 0m
2026-05-10 CSS174 - May 10, 21:25 UTCMay 10, 23:44 UTC2h 20m
2026-05-10 CSS173 - May 10, 16:04 UTCMay 10, 19:15 UTC3h 10m
2026-05-09 CSS6801 SZX → EHU May 9, 17:49 UTCMay 9, 18:00 UTC10m
2026-05-09 CSS358 TPE → SZX May 9, 03:20 UTCMay 9, 03:40 UTC20m
2026-05-09 CSS358 TPE → SZX May 9, 02:20 UTCMay 9, 02:45 UTC25m
2026-05-08 CSS357 SZX → TPE May 8, 22:45 UTCMay 9, 00:05 UTC1h 20m
2026-05-08 CSS6804 EHU → SZX May 8, 20:50 UTCMay 8, 21:00 UTC10m
2026-05-07 CSS7636 EHU → SHE May 7, 21:50 UTCMay 8, 16:15 UTC18h 25m
2026-05-04 CSS128 - May 4, 11:35 UTCMay 4, 17:35 UTC6h 0m
2026-05-04 CSS127 - May 4, 03:09 UTCMay 4, 07:45 UTC4h 35m
2026-05-01 CSS122 OSL → DAC May 1, 18:40 UTCMay 1, 20:05 UTC1h 25m
2026-05-01 CSS121 KGF → KGF May 1, 08:15 UTCMay 1, 15:55 UTC7h 40m
2026-04-30 CSS121 KGF → KGF Apr 30, 16:20 UTCMay 1, 15:55 UTC23h 35m
2026-04-30 CSS148 - Apr 30, 15:35 UTCMay 1, 13:20 UTC21h 45m

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

Mode-S 781DF9 frequently asked

What is Mode-S code 781DF9?
781DF9 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-222D.
Where is Mode-S 781DF9 registered?
Mode-S code 781DF9 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781DF9 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781DF9, octal 36016771, decimal 7,871,993.
What flights does 781DF9 operate?
Mode-S 781DF9 has broadcast 20 distinct callsigns, including CSS121, CSS358, CSS128, CSS357, CSS127.