Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781706

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-309J · AIRBUS A-321neo

Hex
781706
Octal
36013406
Decimal
7,870,214
Country
CN
Tail
B-309J
Type
A21N
No current signal · last broadcast 2h ago
Flights observed
80
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 781706.

Country allocation

The ICAO 24-bit address 781706 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
CSN357 China Southern Airlines 10 2026-05-26
CSN5015 China Southern Airlines 9 2026-05-28
CSN352 China Southern Airlines 8 2026-05-30
CSN3040 China Southern Airlines 7 2026-05-25
CSN5016 China Southern Airlines 6 2026-05-28
CSN358 China Southern Airlines 5 2026-05-26
CSN3039 China Southern Airlines 4 2026-05-25
CSN8100 China Southern Airlines 3 2026-05-21
CSN363 China Southern Airlines 3 2026-05-17
CSN362 China Southern Airlines 3 2026-05-06
CSN351 China Southern Airlines 3 2026-05-29
CSN339 China Southern Airlines 3 2026-05-26
CSN3061 China Southern Airlines 3 2026-05-19
CSN8099 China Southern Airlines 2 2026-05-21
CSN361 China Southern Airlines 2 2026-05-05
CSN340 China Southern Airlines 2 2026-05-27
CSN3062 China Southern Airlines 2 2026-05-19
CSN6774 China Southern Airlines 1 2026-04-27
CSN3989 - 1 2026-05-24
CSN3850 China Southern Airlines 1 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CSN352 SIN → CAN May 30, 03:30 UTCMay 30, 04:10 UTC40m
2026-05-30 CSN352 SIN → CAN May 30, 00:20 UTCMay 30, 00:45 UTC25m
2026-05-29 CSN351 CAN → SIN May 29, 17:00 UTCMay 29, 17:15 UTC15m
2026-05-29 CSN3850 HGH → CAN May 29, 08:55 UTCMay 29, 09:30 UTC35m
2026-05-28 CSN5016 DAC → CAN May 28, 07:20 UTCMay 28, 08:15 UTC55m
2026-05-28 CSN5015 CAN → DAC May 28, 02:10 UTCMay 28, 05:30 UTC3h 20m
2026-05-27 CSN340 ICN → CAN May 27, 01:05 UTCMay 27, 01:24 UTC20m
2026-05-26 CSN339 CAN → ICN May 26, 12:05 UTCMay 26, 12:40 UTC35m
2026-05-26 CSN339 CAN → ICN May 26, 09:35 UTCMay 26, 09:45 UTC10m
2026-05-26 CSN358 BKK → CAN May 26, 04:39 UTCMay 26, 05:20 UTC40m
2026-05-26 CSN357 CAN → BKK May 26, 02:29 UTCMay 26, 03:05 UTC35m
2026-05-26 CSN357 CAN → BKK May 26, 01:00 UTCMay 26, 01:10 UTC10m
2026-05-25 CSN3040 SIN → CAN May 25, 13:35 UTCMay 25, 13:55 UTC20m
2026-05-25 CSN3040 SIN → CAN May 25, 10:45 UTCMay 25, 11:00 UTC15m
2026-05-25 CSN3039 CAN → SIN May 25, 05:40 UTCMay 25, 09:15 UTC3h 35m
2026-05-24 CSN3989 - May 24, 06:25 UTCMay 24, 06:35 UTC10m
2026-05-23 CSN5016 DAC → CAN May 23, 07:50 UTCMay 23, 08:25 UTC35m
2026-05-23 CSN5015 CAN → DAC May 23, 05:35 UTCMay 23, 06:15 UTC40m
2026-05-23 CSN5015 CAN → DAC May 23, 02:55 UTCMay 23, 03:05 UTC10m
2026-05-22 CSN352 SIN → CAN May 22, 03:50 UTCMay 22, 04:10 UTC20m
2026-05-22 CSN352 SIN → CAN May 22, 00:50 UTCMay 22, 01:10 UTC20m
2026-05-21 CSN351 CAN → SIN May 21, 15:10 UTCMay 21, 15:25 UTC15m
2026-05-21 CSN8100 BKK → CAN May 21, 09:20 UTCMay 21, 09:35 UTC15m
2026-05-21 CSN8100 BKK → CAN May 21, 06:55 UTCMay 21, 07:30 UTC35m
2026-05-21 CSN8099 CAN → BKK May 21, 03:05 UTCMay 21, 05:10 UTC2h 5m
2026-05-20 CSN5016 DAC → CAN May 20, 07:35 UTCMay 20, 08:05 UTC30m
2026-05-20 CSN5015 CAN → DAC May 20, 05:35 UTCMay 20, 06:15 UTC40m
2026-05-20 CSN5015 CAN → DAC May 20, 02:50 UTCMay 20, 03:00 UTC10m
2026-05-19 CSN3062 ICN → CAN May 19, 07:55 UTCMay 19, 08:20 UTC25m
2026-05-19 CSN3061 CAN → ICN May 19, 05:25 UTCMay 19, 06:00 UTC35m
2026-05-18 CSN3061 CAN → ICN May 18, 07:35 UTCMay 19, 06:00 UTC22h 24m
2026-05-18 CSN5016 DAC → CAN May 18, 07:15 UTCMay 19, 05:30 UTC22h 14m
2026-05-17 CSN5015 CAN → DAC May 17, 12:05 UTCMay 18, 05:20 UTC17h 15m
2026-05-17 CSN363 CAN → BKK May 17, 08:20 UTCMay 17, 10:30 UTC2h 10m
2026-05-16 CSN3493 CAN → KMG May 16, 02:15 UTCMay 16, 02:25 UTC10m
2026-05-15 CSN3040 SIN → CAN May 15, 10:05 UTCMay 15, 14:05 UTC4h 0m
2026-05-15 CSN3039 CAN → SIN May 15, 05:20 UTCMay 15, 08:25 UTC3h 5m
2026-05-14 CSN5016 DAC → CAN May 14, 07:20 UTCMay 14, 08:10 UTC50m
2026-05-14 CSN5015 CAN → DAC May 14, 01:50 UTCMay 14, 05:35 UTC3h 45m
2026-05-13 CSN358 BKK → CAN May 13, 05:00 UTCMay 13, 05:40 UTC40m
2026-05-13 CSN357 CAN → BKK May 13, 02:30 UTCMay 13, 03:10 UTC40m
2026-05-13 CSN357 CAN → BKK May 13, 00:45 UTCMay 13, 01:05 UTC20m
2026-05-12 CSN3040 SIN → CAN May 12, 13:20 UTCMay 12, 13:35 UTC15m
2026-05-12 CSN3040 SIN → CAN May 12, 10:25 UTCMay 12, 10:40 UTC15m
2026-05-12 CSN3039 CAN → SIN May 12, 05:00 UTCMay 12, 08:15 UTC3h 15m
2026-05-11 CSN5016 DAC → CAN May 11, 08:05 UTCMay 11, 08:45 UTC40m
2026-05-11 CSN5015 CAN → DAC May 11, 05:25 UTCMay 11, 06:10 UTC45m
2026-05-11 CSN5015 CAN → DAC May 11, 02:25 UTCMay 11, 02:40 UTC15m
2026-05-10 CSN364 BKK → CAN May 10, 12:15 UTCMay 10, 12:59 UTC45m
2026-05-10 CSN363 CAN → BKK May 10, 09:45 UTCMay 10, 10:35 UTC50m

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-309J page for operator, model, and routing details .

Mode-S 781706 frequently asked

What is Mode-S code 781706?
781706 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-309J.
Where is Mode-S 781706 registered?
Mode-S code 781706 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781706 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 781706, octal 36013406, decimal 7,870,214.
What flights does 781706 operate?
Mode-S 781706 has broadcast 20 distinct callsigns, including CSN357, CSN5015, CSN352, CSN3040, CSN5016.