Apparatus

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sensors Mode-S transponder

781CFD

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-221N · BOEING 767-300

Hex
781CFD
Octal
36016375
Decimal
7,871,741
Country
CN
Tail
B-221N
Type
B763
No current signal · last broadcast 4d ago
Flights observed
112
Distinct callsigns
20
Country
CN
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S 781CFD.

Country allocation

The ICAO 24-bit address 781CFD 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
CSS163 SF Airlines 7 2026-05-14
CSS7635 - 6 2026-07-12
CSS6835 - 6 2026-07-09
CSS159 - 6 2026-06-25
CSS364 SF Airlines 5 2026-05-26
CSS363 SF Airlines 5 2026-05-25
CSS257 - 4 2026-06-20
CSS239 SF Airlines 4 2026-06-27
CSS168 - 4 2026-06-17
CSS7223 SF Airlines 3 2026-06-03
CSS6834 - 3 2026-07-09
CSS6805 SF Airlines 3 2026-05-26
CSS6804 - 3 2026-06-19
CSS358 SF Airlines 3 2026-05-08
CSS357 SF Airlines 3 2026-05-08
CSS240 - 3 2026-06-26
CSS164 SF Airlines 3 2026-05-14
CSS258 - 2 2026-04-25
CSS256 - 2 2026-06-21
CSS255 - 2 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 CSS7635 - Jul 12, 21:50 UTCJul 13, 16:05 UTC18h 15m
2026-07-09 CSS6835 - Jul 9, 22:55 UTCJul 9, 23:05 UTC10m
2026-07-09 CSS6834 - Jul 9, 18:35 UTCJul 9, 19:15 UTC40m
2026-07-08 CSS6835 - Jul 8, 22:30 UTCJul 8, 22:45 UTC15m
2026-07-08 CSS6834 - Jul 8, 19:00 UTCJul 8, 19:45 UTC45m
2026-07-07 CSS6835 - Jul 7, 20:50 UTCJul 7, 21:00 UTC10m
2026-07-07 CSS6834 - Jul 7, 18:40 UTCJul 7, 18:50 UTC10m
2026-07-05 CSS7635 - Jul 5, 16:55 UTCJul 5, 17:10 UTC15m
2026-07-01 CSS7636 - Jul 1, 21:45 UTCJul 2, 16:35 UTC18h 50m
2026-07-01 CSS6801 SZX → EHU Jul 1, 17:45 UTCJul 1, 17:55 UTC10m
2026-06-30 CSS6964 - Jun 30, 10:05 UTCJun 30, 10:25 UTC20m
2026-06-27 CSS158 - Jun 27, 11:00 UTCJun 27, 13:04 UTC2h 5m
2026-06-27 CSS239 ZUH → DEL Jun 27, 04:24 UTCJun 27, 08:49 UTC4h 25m
2026-06-26 CSS240 - Jun 26, 20:29 UTCJun 27, 00:25 UTC3h 55m
2026-06-25 CSS159 - Jun 25, 23:19 UTCJun 26, 18:34 UTC19h 15m
2026-06-25 CSS159 - Jun 25, 23:14 UTCJun 26, 18:34 UTC19h 20m
2026-06-25 CSS159 - Jun 25, 19:20 UTCJun 26, 18:34 UTC23h 15m
2026-06-25 CSS128 - Jun 25, 17:54 UTCJun 26, 17:15 UTC23h 20m
2026-06-24 CSS205 - Jun 24, 22:39 UTCJun 25, 14:14 UTC15h 35m
2026-06-24 CSS206 - Jun 24, 17:20 UTCJun 25, 14:14 UTC20h 55m
2026-06-24 CSS206 BUD → BUD Jun 24, 17:10 UTCJun 25, 14:14 UTC21h 5m
2026-06-24 CSS127 - Jun 24, 05:59 UTCJun 24, 13:54 UTC7h 55m
2026-06-21 CSS256 - Jun 21, 10:09 UTCJun 21, 12:24 UTC2h 15m
2026-06-20 CSS257 - Jun 20, 23:55 UTCJun 21, 08:04 UTC8h 10m
2026-06-20 CSS257 DAC → DAC Jun 20, 10:04 UTCJun 20, 18:59 UTC8h 55m
2026-06-20 CSS255 - Jun 20, 04:04 UTCJun 20, 07:14 UTC3h 10m
2026-06-19 CSS6804 - Jun 19, 20:40 UTCJun 19, 20:55 UTC15m
2026-06-17 CSS168 - Jun 17, 12:15 UTCJun 17, 12:35 UTC20m
2026-06-17 CSS168 - Jun 17, 09:30 UTCJun 17, 09:45 UTC15m
2026-06-17 CSS168 - Jun 17, 05:35 UTCJun 17, 08:50 UTC3h 15m
2026-06-16 CSS167 - Jun 16, 14:45 UTCJun 17, 03:40 UTC12h 56m
2026-06-16 CSS239 ZUH → DEL Jun 16, 08:44 UTCJun 16, 12:50 UTC4h 5m
2026-06-16 CSS240 - Jun 16, 00:20 UTCJun 16, 04:10 UTC3h 50m
2026-06-15 CSS161 - Jun 15, 07:15 UTCJun 15, 22:25 UTC15h 10m
2026-06-15 CSS168 HAN → EHU Jun 15, 00:55 UTCJun 15, 03:55 UTC3h 0m
2026-06-14 CSS167 - Jun 14, 10:05 UTCJun 14, 22:45 UTC12h 40m
2026-06-14 CSS165 NQZ → NQZ Jun 14, 05:25 UTCJun 14, 07:30 UTC2h 5m
2026-06-09 CSS7635 SHE → EHU Jun 9, 21:55 UTCJun 10, 16:15 UTC18h 20m
2026-06-06 CSS7635 SHE → EHU Jun 6, 21:54 UTCJun 7, 16:45 UTC18h 50m
2026-06-04 CSS7635 SHE → EHU Jun 4, 22:50 UTCJun 5, 16:25 UTC17h 35m
2026-06-03 CSS6835 SZX → HGH Jun 3, 20:55 UTCJun 3, 21:05 UTC10m
2026-06-03 CSS7223 HGH → SZX Jun 3, 19:00 UTCJun 3, 19:10 UTC10m
2026-06-01 CSS6835 SZX → HGH Jun 1, 20:45 UTCJun 1, 21:00 UTC15m
2026-06-01 CSS7223 HGH → SZX Jun 1, 18:10 UTCJun 1, 19:00 UTC50m
2026-05-31 CSS6835 SZX → HGH May 31, 20:55 UTCMay 31, 21:05 UTC10m
2026-05-31 CSS7223 HGH → SZX May 31, 18:15 UTCMay 31, 19:00 UTC45m
2026-05-29 CSS7635 SHE → EHU May 29, 22:00 UTCMay 30, 16:15 UTC18h 15m
2026-05-28 CSS184 ORD → YHZ May 28, 12:40 UTCMay 28, 14:30 UTC1h 50m
2026-05-28 CSS184 ORD → YHZ May 28, 07:00 UTCMay 28, 10:40 UTC3h 40m
2026-05-28 CSS183 ANC → LAX May 28, 01:30 UTCMay 28, 04:05 UTC2h 35m

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-221N page for operator, model, and routing details .

Mode-S 781CFD frequently asked

What is Mode-S code 781CFD?
781CFD is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-221N.
Where is Mode-S 781CFD registered?
Mode-S code 781CFD is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781CFD broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781CFD, octal 36016375, decimal 7,871,741.
What flights does 781CFD operate?
Mode-S 781CFD has broadcast 20 distinct callsigns, including CSS163, CSS7635, CSS6835, CSS159, CSS364.