Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781031

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-8640 · AIRBUS A-321

Hex
781031
Octal
36010061
Decimal
7,868,465
Country
CN
Tail
B-8640
Type
A321
No current signal · last broadcast Jul 26, 16:35 UTC
Flights observed
101
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 16:35 UTC

Last known position

Most recent position reported by Mode-S 781031.

Country allocation

The ICAO 24-bit address 781031 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
CSN6078 China Southern Airlines 19 2026-07-26
CSN6077 China Southern Airlines 15 2026-06-09
CSN6437 - 14 2026-07-16
CSN313 China Southern Airlines 13 2026-05-21
CSN314 China Southern Airlines 9 2026-05-22
CSN6209 - 6 2026-07-20
CSN6543 China Southern Airlines 4 2026-07-25
CSN6509 China Southern Airlines 3 2026-07-23
CSN6515 China Southern Airlines 2 2026-05-08
CSN6373 - 2 2026-07-05
CSN6346 - 2 2026-07-07
CSN5872 - 2 2026-07-12
CSN370 - 2 2026-06-18
CSN369 - 2 2026-06-18
CSN8310 China Southern Airlines 1 2026-06-16
CSN8309 - 1 2026-06-16
CSN6753 China Southern Airlines 1 2026-04-29
CSN6104 China Southern Airlines 1 2026-06-28
CSN6096 China Southern Airlines 1 2026-05-03
CSN6095 China Southern Airlines 1 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN6095 SZX → SGN Jul 26, 16:20 UTCJul 26, 16:35 UTC15m
2026-07-26 CSN6078 SGN → PVG Jul 26, 02:45 UTCJul 26, 09:40 UTC6h 56m
2026-07-25 CSN6543 CGQ → PVG Jul 25, 04:45 UTCJul 26, 02:55 UTC22h 10m
2026-07-25 CSN6543 CGQ → PVG Jul 25, 01:45 UTCJul 25, 05:15 UTC3h 30m
2026-07-24 CSN6078 SGN → PVG Jul 24, 08:35 UTCJul 25, 05:15 UTC20h 40m
2026-07-24 CSN6078 SGN → PVG Jul 24, 03:15 UTCJul 25, 01:55 UTC22h 40m
2026-07-23 CSN6078 SGN → PVG Jul 23, 13:30 UTCJul 24, 09:50 UTC20h 20m
2026-07-23 CSN6509 SHE → PVG Jul 23, 06:40 UTCJul 24, 03:25 UTC20h 45m
2026-07-21 CSN6078 - Jul 21, 09:00 UTCJul 21, 23:20 UTC14h 20m
2026-07-21 CSN6078 - Jul 21, 03:35 UTCJul 21, 23:20 UTC19h 45m
2026-07-20 CSN6078 - Jul 20, 13:15 UTCJul 21, 09:45 UTC20h 29m
2026-07-20 CSN6209 - Jul 20, 04:20 UTCJul 21, 03:50 UTC23h 30m
2026-07-20 CSN6209 - Jul 20, 00:50 UTCJul 20, 13:40 UTC12h 50m
2026-07-19 CSN6543 CGQ → PVG Jul 19, 04:40 UTCJul 20, 00:55 UTC20h 15m
2026-07-16 CSN6437 - Jul 16, 04:50 UTCJul 16, 13:34 UTC8h 45m
2026-07-15 CSN6543 - Jul 15, 04:25 UTCJul 15, 05:10 UTC45m
2026-07-12 CSN5872 - Jul 12, 15:10 UTCJul 13, 09:50 UTC18h 40m
2026-07-07 CSN6346 - Jul 7, 12:25 UTCJul 7, 17:05 UTC4h 40m
2026-07-06 CSN6346 - Jul 6, 15:20 UTCJul 7, 12:45 UTC21h 25m
2026-07-06 CSN6509 - Jul 6, 05:35 UTCJul 6, 15:30 UTC9h 55m
2026-07-05 CSN6373 - Jul 5, 15:10 UTCJul 6, 05:35 UTC14h 25m
2026-07-01 CSN6437 - Jul 1, 13:00 UTCJul 2, 04:00 UTC15h 0m
2026-07-01 CSN6437 - Jul 1, 04:40 UTCJul 2, 04:00 UTC23h 20m
2026-07-01 CSN6209 - Jul 1, 04:05 UTCJul 2, 00:20 UTC20h 15m
2026-06-28 CSN6104 CTU → PKX Jun 28, 11:35 UTCJun 28, 11:55 UTC20m
2026-06-27 CSN6437 - Jun 27, 14:39 UTCJun 28, 05:24 UTC14h 45m
2026-06-25 CSN6437 - Jun 25, 04:20 UTCJun 25, 13:24 UTC9h 5m
2026-06-22 CSN6437 - Jun 22, 13:35 UTCJun 23, 04:45 UTC15h 10m
2026-06-22 CSN6437 - Jun 22, 04:24 UTCJun 23, 04:09 UTC23h 45m
2026-06-19 CSN6437 - Jun 19, 12:49 UTCJun 20, 04:39 UTC15h 50m
2026-06-19 CSN6437 - Jun 19, 03:44 UTCJun 19, 13:09 UTC9h 25m
2026-06-18 CSN370 - Jun 18, 12:30 UTCJun 19, 04:14 UTC15h 44m
2026-06-18 CSN369 - Jun 18, 09:55 UTCJun 18, 10:35 UTC40m
2026-06-16 CSN8310 NRT → PVG Jun 16, 05:50 UTCJun 16, 07:34 UTC1h 45m
2026-06-16 CSN8309 - Jun 16, 02:04 UTCJun 16, 03:45 UTC1h 40m
2026-06-14 CSN6373 CGQ → PVG Jun 14, 03:50 UTCJun 14, 13:15 UTC9h 25m
2026-06-13 CSN5872 - Jun 13, 10:55 UTCJun 14, 04:30 UTC17h 35m
2026-06-11 CSN6437 SYX → HGH Jun 11, 04:10 UTCJun 11, 13:30 UTC9h 20m
2026-06-10 CSN370 ICN → PVG Jun 10, 12:35 UTCJun 11, 04:10 UTC15h 35m
2026-06-10 CSN369 PVG → ICN Jun 10, 10:10 UTCJun 10, 10:40 UTC30m
2026-06-09 CSN6077 PVG → SGN Jun 9, 02:50 UTCJun 9, 08:35 UTC5h 45m
2026-06-03 CSN6078 SGN → PVG Jun 3, 02:50 UTCJun 3, 08:35 UTC5h 45m
2026-06-02 CSN6078 SGN → PVG Jun 2, 07:15 UTCJun 3, 03:05 UTC19h 50m
2026-06-02 CSN6078 SGN → PVG Jun 2, 02:50 UTCJun 2, 08:15 UTC5h 25m
2026-05-29 CSN6077 PVG → SGN May 29, 12:40 UTCMay 30, 08:15 UTC19h 35m
2026-05-29 CSN6077 PVG → SGN May 29, 04:20 UTCMay 30, 02:55 UTC22h 35m
2026-05-29 CSN6209 HRB → PVG May 29, 03:50 UTCMay 29, 12:40 UTC8h 50m
2026-05-28 CSN6437 SYX → HGH May 28, 12:45 UTCMay 29, 04:20 UTC15h 35m
2026-05-28 CSN6437 SYX → HGH May 28, 04:25 UTCMay 29, 03:55 UTC23h 30m
2026-05-28 CSN6437 SYX → HGH May 28, 03:55 UTCMay 28, 13:30 UTC9h 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-8640 page for operator, model, and routing details .

Mode-S 781031 frequently asked

What is Mode-S code 781031?
781031 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-8640.
Where is Mode-S 781031 registered?
Mode-S code 781031 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781031 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781031, octal 36010061, decimal 7,868,465.
What flights does 781031 operate?
Mode-S 781031 has broadcast 20 distinct callsigns, including CSN6078, CSN6077, CSN6437, CSN313, CSN314.