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sensors Mode-S transponder

781677

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20A2 · BOEING 767-300

Hex
781677
Octal
36013167
Decimal
7,870,071
Country
CN
Tail
B-20A2
Type
B763
No current signal · last broadcast Jul 25, 15:00 UTC
Flights observed
105
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 15:00 UTC

Last known position

Most recent position reported by Mode-S 781677.

Country allocation

The ICAO 24-bit address 781677 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 7 2026-07-23
CSS363 - 7 2026-07-15
CSS364 - 6 2026-07-16
CSS239 SF Airlines 6 2026-04-27
CSS240 - 5 2026-04-26
CSS161 SF Airlines 5 2026-04-22
CSS6801 - 4 2026-07-16
CSS257 - 4 2026-06-13
CSS247 - 4 2026-07-25
CSS159 SF Airlines 4 2026-04-26
CSS258 - 3 2026-06-13
CSS155 SF Airlines 3 2026-04-24
CSS7636 SF Airlines 2 2026-07-22
CSS7103 - 2 2026-07-08
CSS6803 - 2 2026-06-27
CSS358 - 2 2026-07-14
CSS310 SF Airlines 2 2026-05-29
CSS309 SF Airlines 2 2026-05-29
CSS248 - 2 2026-07-25
CSS163 SF Airlines 2 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CSS248 - Jul 25, 14:25 UTCJul 25, 15:00 UTC35m
2026-07-25 CSS247 - Jul 25, 07:55 UTCJul 25, 08:15 UTC20m
2026-07-25 CSS247 - Jul 25, 04:45 UTCJul 25, 04:55 UTC10m
2026-07-23 CSS7635 SHE → EHU Jul 23, 22:10 UTCJul 24, 16:30 UTC18h 20m
2026-07-23 CSS7635 SHE → EHU Jul 23, 16:10 UTCJul 23, 22:10 UTC6h 0m
2026-07-22 CSS7636 EHU → SHE Jul 22, 22:00 UTCJul 23, 16:20 UTC18h 20m
2026-07-18 CSS248 - Jul 18, 13:45 UTCJul 18, 15:00 UTC1h 15m
2026-07-18 CSS247 - Jul 18, 07:25 UTCJul 18, 07:35 UTC10m
2026-07-17 CSS247 - Jul 17, 16:15 UTCJul 18, 04:20 UTC12h 6m
2026-07-16 CSS7635 - Jul 16, 22:19 UTCJul 17, 16:29 UTC18h 10m
2026-07-16 CSS6801 - Jul 16, 17:45 UTCJul 16, 18:00 UTC15m
2026-07-16 CSS364 - Jul 16, 01:50 UTCJul 16, 03:20 UTC1h 30m
2026-07-15 CSS363 - Jul 15, 22:15 UTCJul 16, 00:00 UTC1h 45m
2026-07-15 CSS6846 - Jul 15, 01:10 UTCJul 15, 01:20 UTC10m
2026-07-14 CSS358 - Jul 14, 02:10 UTCJul 14, 03:25 UTC1h 15m
2026-07-13 CSS357 - Jul 13, 22:10 UTCJul 13, 23:40 UTC1h 30m
2026-07-08 CSS7103 - Jul 8, 17:00 UTCJul 8, 17:15 UTC15m
2026-07-06 CSS7635 - Jul 6, 22:55 UTCJul 7, 16:40 UTC17h 45m
2026-06-29 CSS7636 - Jun 29, 21:54 UTCJun 30, 16:40 UTC18h 46m
2026-06-28 CSS6839 - Jun 28, 22:49 UTCJun 28, 22:59 UTC10m
2026-06-28 CSS6806 - Jun 28, 20:39 UTCJun 28, 20:50 UTC10m
2026-06-27 CSS6803 - Jun 27, 17:39 UTCJun 27, 17:49 UTC10m
2026-06-27 CSS364 - Jun 27, 04:19 UTCJun 27, 05:55 UTC1h 35m
2026-06-27 CSS363 SZX → NRT Jun 27, 00:55 UTCJun 27, 02:29 UTC1h 35m
2026-06-25 - - Jun 25, 23:19 UTCJun 25, 23:34 UTC15m
2026-06-25 CSS302 - Jun 25, 19:54 UTCJun 25, 20:25 UTC30m
2026-06-25 CSS301 - Jun 25, 14:59 UTCJun 25, 15:10 UTC10m
2026-06-24 CSS6801 SZX → EHU Jun 24, 17:59 UTCJun 24, 18:09 UTC10m
2026-06-23 CSS7635 - Jun 23, 16:35 UTCJun 23, 16:50 UTC15m
2026-06-21 CSS7635 - Jun 21, 21:54 UTCJun 22, 16:24 UTC18h 30m
2026-06-21 CSS6803 - Jun 21, 17:29 UTCJun 21, 17:39 UTC10m
2026-06-13 CSS258 - Jun 13, 07:00 UTCJun 13, 07:35 UTC35m
2026-06-13 CSS257 - Jun 13, 04:30 UTCJun 13, 05:10 UTC40m
2026-06-11 CSS7104 EHU → PEK Jun 11, 21:45 UTCJun 11, 21:55 UTC10m
2026-06-08 CSS7103 PEK → EHU Jun 8, 17:00 UTCJun 8, 17:15 UTC15m
2026-06-06 CSS258 - Jun 6, 06:55 UTCJun 6, 07:05 UTC10m
2026-06-06 CSS257 - Jun 6, 04:55 UTCJun 6, 05:15 UTC20m
2026-06-02 CSS6805 SZX → EHU Jun 2, 16:40 UTCJun 2, 16:50 UTC10m
2026-06-01 CSS3005 - Jun 1, 09:20 UTCJun 1, 09:40 UTC20m
2026-06-01 CSS364 NRT → SZX Jun 1, 01:20 UTCJun 1, 02:40 UTC1h 20m
2026-05-31 CSS363 SZX → NRT May 31, 21:40 UTCMay 31, 23:05 UTC1h 25m
2026-05-31 CSS363 SZX → NRT May 31, 19:15 UTCMay 31, 19:30 UTC15m
2026-05-30 CSS6836 HGH → SZX May 30, 21:45 UTCMay 30, 22:30 UTC45m
2026-05-30 CSS7224 SZX → HGH May 30, 17:35 UTCMay 30, 17:45 UTC10m
2026-05-30 CSS364 NRT → SZX May 30, 01:50 UTCMay 30, 03:25 UTC1h 35m
2026-05-29 CSS363 SZX → NRT May 29, 22:45 UTCMay 30, 00:00 UTC1h 15m
2026-05-29 CSS310 KUL → SZX May 29, 17:35 UTCMay 29, 17:55 UTC20m
2026-05-29 CSS310 KUL → SZX May 29, 14:25 UTCMay 29, 14:50 UTC25m
2026-05-29 CSS309 SZX → KUL May 29, 03:50 UTCMay 29, 04:20 UTC30m
2026-05-29 CSS309 SZX → KUL May 29, 00:55 UTCMay 29, 01:05 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-20A2 page for operator, model, and routing details .

Mode-S 781677 frequently asked

What is Mode-S code 781677?
781677 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20A2.
Where is Mode-S 781677 registered?
Mode-S code 781677 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781677 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 15:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781677, octal 36013167, decimal 7,870,071.
What flights does 781677 operate?
Mode-S 781677 has broadcast 20 distinct callsigns, including CSS7635, CSS363, CSS364, CSS239, CSS240.