Apparatus

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sensors Mode-S transponder

781FD6

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-233W · BOEING 767-300

Hex
781FD6
Octal
36017726
Decimal
7,872,470
Country
CN
Tail
B-233W
Type
B763
No current signal · last broadcast 2h ago
Flights observed
140
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 781FD6.

Country allocation

The ICAO 24-bit address 781FD6 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
CSS302 SF Airlines 17 2026-06-11
CSS301 SF Airlines 17 2026-06-11
CSS6835 - 6 2026-07-13
CSS364 SF Airlines 6 2026-06-11
CSS161 SF Airlines 6 2026-05-20
CSS159 SF Airlines 6 2026-05-16
CSS122 SF Airlines 6 2026-05-19
CSS121 SF Airlines 6 2026-05-19
CSS7223 - 5 2026-07-13
CSS170 - 5 2026-05-03
CSS7635 - 4 2026-07-02
CSS363 SF Airlines 4 2026-06-10
CSS358 - 4 2026-07-04
CSS7103 - 3 2026-06-30
CSS6802 SF Airlines 3 2026-07-16
CSS357 - 3 2026-07-17
CSS240 - 3 2026-05-21
CSS239 SF Airlines 3 2026-05-21
CSS148 - 3 2026-05-13
CSS128 - 3 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CSS357 - Jul 17, 23:14 UTCJul 18, 00:35 UTC1h 20m
2026-07-16 CSS6802 EHU → SZX Jul 16, 22:10 UTCJul 16, 22:19 UTC10m
2026-07-16 CSS248 - Jul 16, 09:05 UTCJul 16, 13:15 UTC4h 10m
2026-07-16 CSS247 - Jul 16, 03:30 UTCJul 16, 04:10 UTC40m
2026-07-13 CSS6835 - Jul 13, 20:50 UTCJul 13, 21:00 UTC10m
2026-07-13 CSS7223 - Jul 13, 18:30 UTCJul 13, 18:50 UTC20m
2026-07-10 CSS6835 - Jul 10, 21:05 UTCJul 10, 21:15 UTC10m
2026-07-10 CSS7223 - Jul 10, 18:35 UTCJul 10, 19:00 UTC25m
2026-07-04 CSS358 - Jul 4, 03:45 UTCJul 4, 04:05 UTC20m
2026-07-04 CSS358 - Jul 4, 02:50 UTCJul 4, 03:15 UTC25m
2026-07-04 CSS357 - Jul 4, 00:05 UTCJul 4, 00:55 UTC50m
2026-07-03 CSS6804 - Jul 3, 21:10 UTCJul 3, 21:25 UTC15m
2026-07-02 CSS7635 - Jul 2, 21:50 UTCJul 3, 16:25 UTC18h 35m
2026-06-30 CSS7103 - Jun 30, 17:10 UTCJun 30, 17:35 UTC25m
2026-06-26 CSS7635 - Jun 26, 21:55 UTCJun 27, 16:20 UTC18h 25m
2026-06-26 CSS7635 - Jun 26, 16:00 UTCJun 26, 21:59 UTC6h 0m
2026-06-25 CSS7635 - Jun 25, 21:55 UTCJun 26, 16:14 UTC18h 20m
2026-06-20 CSS6803 - Jun 20, 17:24 UTCJun 20, 17:39 UTC15m
2026-06-19 CSS6802 - Jun 19, 21:44 UTCJun 19, 22:04 UTC20m
2026-06-18 CSS6835 - Jun 18, 22:20 UTCJun 18, 22:30 UTC10m
2026-06-18 CSS7223 - Jun 18, 19:50 UTCJun 18, 20:05 UTC15m
2026-06-18 CSS6843 - Jun 18, 13:55 UTCJun 18, 14:05 UTC10m
2026-06-18 CSS6852 HGH → SZX Jun 18, 05:00 UTCJun 18, 05:15 UTC15m
2026-06-17 CSS6835 SZX → HGH Jun 17, 21:05 UTCJun 17, 21:15 UTC10m
2026-06-17 CSS7223 - Jun 17, 18:45 UTCJun 17, 19:00 UTC15m
2026-06-14 CSS6839 - Jun 14, 22:45 UTCJun 14, 22:55 UTC10m
2026-06-14 CSS6806 EHU → SZX Jun 14, 20:55 UTCJun 14, 21:05 UTC10m
2026-06-12 CSS6843 - Jun 12, 14:25 UTCJun 12, 14:35 UTC10m
2026-06-11 CSS302 SIN → SZX Jun 11, 22:55 UTCJun 11, 23:10 UTC15m
2026-06-11 CSS302 SIN → SZX Jun 11, 19:35 UTCJun 11, 19:55 UTC20m
2026-06-11 CSS301 SZX → SIN Jun 11, 16:35 UTCJun 11, 17:10 UTC35m
2026-06-11 CSS301 SZX → SIN Jun 11, 13:55 UTCJun 11, 14:05 UTC10m
2026-06-11 CSS364 NRT → SZX Jun 11, 05:40 UTCJun 11, 05:50 UTC10m
2026-06-11 CSS364 NRT → SZX Jun 11, 01:20 UTCJun 11, 02:55 UTC1h 35m
2026-06-10 CSS363 SZX → NRT Jun 10, 21:55 UTCJun 10, 23:10 UTC1h 15m
2026-06-10 CSS363 SZX → NRT Jun 10, 19:35 UTCJun 10, 19:45 UTC10m
2026-06-10 CSS364 NRT → SZX Jun 10, 09:15 UTCJun 10, 09:25 UTC10m
2026-06-10 CSS364 NRT → SZX Jun 10, 04:55 UTCJun 10, 06:25 UTC1h 30m
2026-06-09 CSS363 SZX → NRT Jun 9, 21:30 UTCJun 9, 22:55 UTC1h 25m
2026-06-09 CSS364 NRT → SZX Jun 9, 05:30 UTCJun 9, 05:55 UTC25m
2026-06-09 CSS364 NRT → SZX Jun 9, 01:25 UTCJun 9, 03:00 UTC1h 35m
2026-06-08 CSS363 SZX → NRT Jun 8, 21:30 UTCJun 8, 22:50 UTC1h 20m
2026-06-07 CSS302 SIN → SZX Jun 7, 19:15 UTCJun 7, 19:45 UTC30m
2026-06-07 CSS301 SZX → SIN Jun 7, 16:45 UTCJun 7, 17:05 UTC20m
2026-06-07 CSS301 SZX → SIN Jun 7, 14:05 UTCJun 7, 14:15 UTC10m
2026-06-06 CSS302 SIN → SZX Jun 6, 22:50 UTCJun 6, 23:00 UTC10m
2026-06-06 CSS302 SIN → SZX Jun 6, 19:34 UTCJun 6, 20:00 UTC25m
2026-06-06 CSS301 SZX → SIN Jun 6, 17:29 UTCJun 6, 17:44 UTC15m
2026-06-06 CSS301 SZX → SIN Jun 6, 14:40 UTCJun 6, 14:54 UTC15m
2026-06-05 CSS302 SIN → SZX Jun 5, 22:45 UTCJun 5, 23:00 UTC15m

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-233W page for operator, model, and routing details .

Mode-S 781FD6 frequently asked

What is Mode-S code 781FD6?
781FD6 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-233W.
Where is Mode-S 781FD6 registered?
Mode-S code 781FD6 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781FD6 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 781FD6, octal 36017726, decimal 7,872,470.
What flights does 781FD6 operate?
Mode-S 781FD6 has broadcast 20 distinct callsigns, including CSS302, CSS301, CSS6835, CSS364, CSS161.