Apparatus

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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 Jul 26, 02:05 UTC
Flights observed
190
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 02:05 UTC

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
CSN352 - 15 2026-07-09
CSN3040 - 14 2026-07-03
CSN5015 - 13 2026-07-04
CSN361 China Southern Airlines 12 2026-07-07
CSN357 - 12 2026-06-30
CSN3039 - 11 2026-07-03
CSN5016 - 10 2026-07-04
CSN362 - 10 2026-07-08
CSN6852 - 8 2026-07-18
CSN351 - 8 2026-07-08
CSN6377 China Southern Airlines 6 2026-07-21
CSN6342 - 6 2026-07-19
CSN358 - 6 2026-06-30
CSN3061 - 6 2026-06-24
CSN3062 - 5 2026-06-24
CSN8100 - 4 2026-06-20
CSN6378 - 4 2026-07-16
CSN6341 - 4 2026-07-20
CSN363 - 4 2026-06-14
CSN8099 - 3 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CSN3905 CAN → HRB Jul 25, 17:25 UTCJul 26, 02:05 UTC8h 40m
2026-07-22 CSN3810 - Jul 22, 14:05 UTCJul 22, 14:15 UTC10m
2026-07-21 CSN6377 CGQ → CAN Jul 21, 12:25 UTCJul 21, 12:40 UTC15m
2026-07-20 CSN6341 - Jul 20, 14:50 UTCJul 21, 08:50 UTC17h 59m
2026-07-19 CSN6377 CGQ → CAN Jul 19, 12:10 UTCJul 20, 06:00 UTC17h 50m
2026-07-19 CSN6342 - Jul 19, 08:15 UTCJul 20, 06:00 UTC21h 45m
2026-07-19 CSN6342 - Jul 19, 01:00 UTCJul 19, 12:25 UTC11h 25m
2026-07-18 CSN6852 - Jul 18, 15:45 UTCJul 19, 12:25 UTC20h 40m
2026-07-18 CSN6852 - Jul 18, 07:25 UTCJul 19, 01:10 UTC17h 45m
2026-07-18 CSN6852 - Jul 18, 03:35 UTCJul 19, 01:10 UTC21h 35m
2026-07-18 CSN6852 - Jul 18, 03:20 UTCJul 19, 01:10 UTC21h 50m
2026-07-17 CSN6377 CGQ → CAN Jul 17, 12:15 UTCJul 18, 07:35 UTC19h 21m
2026-07-17 CSN6342 - Jul 17, 08:15 UTCJul 18, 07:30 UTC23h 16m
2026-07-17 CSN6341 - Jul 17, 01:05 UTCJul 17, 12:30 UTC11h 25m
2026-07-16 CSN6852 - Jul 16, 14:55 UTCJul 17, 12:30 UTC21h 35m
2026-07-16 CSN6851 - Jul 16, 07:20 UTCJul 17, 01:20 UTC18h 0m
2026-07-16 CSN6851 - Jul 16, 03:35 UTCJul 17, 01:20 UTC21h 45m
2026-07-16 CSN6378 - Jul 16, 03:20 UTCJul 17, 01:20 UTC22h 0m
2026-07-15 CSN6378 - Jul 15, 12:20 UTCJul 16, 07:35 UTC19h 15m
2026-07-15 CSN6342 - Jul 15, 08:10 UTCJul 16, 07:30 UTC23h 20m
2026-07-15 CSN6341 - Jul 15, 01:00 UTCJul 15, 12:35 UTC11h 35m
2026-07-14 CSN6341 - Jul 14, 14:45 UTCJul 15, 12:35 UTC21h 49m
2026-07-14 CSN6378 - Jul 14, 03:45 UTCJul 14, 07:55 UTC4h 10m
2026-07-13 CSN6377 - Jul 13, 12:15 UTCJul 14, 07:55 UTC19h 40m
2026-07-13 CSN6342 - Jul 13, 08:15 UTCJul 14, 04:00 UTC19h 45m
2026-07-12 CSN6851 - Jul 12, 07:31 UTCJul 13, 01:15 UTC17h 45m
2026-07-12 CSN6378 - Jul 12, 03:15 UTCJul 13, 01:15 UTC22h 0m
2026-07-11 CSN6377 - Jul 11, 12:15 UTCJul 11, 12:40 UTC25m
2026-07-11 - - Jul 11, 03:25 UTCJul 11, 03:35 UTC10m
2026-07-10 CSN6852 - Jul 10, 07:30 UTCJul 11, 01:15 UTC17h 45m
2026-07-10 CSN6852 - Jul 10, 04:05 UTCJul 11, 01:15 UTC21h 10m
2026-07-09 CSN6377 - Jul 9, 12:50 UTCJul 9, 13:00 UTC10m
2026-07-09 CSN6342 - Jul 9, 08:35 UTCJul 9, 08:55 UTC20m
2026-07-09 CSN352 - Jul 9, 03:25 UTCJul 9, 03:50 UTC25m
2026-07-09 CSN352 - Jul 9, 00:20 UTCJul 9, 00:45 UTC25m
2026-07-08 CSN351 - Jul 8, 16:05 UTCJul 8, 16:35 UTC30m
2026-07-08 CSN351 - Jul 8, 13:25 UTCJul 8, 13:35 UTC10m
2026-07-08 CSN3878 - Jul 8, 10:45 UTCJul 8, 11:15 UTC30m
2026-07-08 CSN3877 - Jul 8, 06:25 UTCJul 8, 06:35 UTC10m
2026-07-08 CSN362 - Jul 8, 01:30 UTCJul 8, 03:10 UTC1h 40m
2026-07-07 CSN361 CAN → BKK Jul 7, 16:30 UTCJul 7, 18:40 UTC2h 10m
2026-07-07 CSN362 - Jul 7, 01:30 UTCJul 7, 03:05 UTC1h 35m
2026-07-06 CSN361 CAN → BKK Jul 6, 19:00 UTCJul 6, 19:35 UTC35m
2026-07-06 CSN361 CAN → BKK Jul 6, 17:25 UTCJul 6, 17:35 UTC10m
2026-07-06 CSN3821 - Jul 6, 06:00 UTCJul 6, 06:10 UTC10m
2026-07-06 CSN362 - Jul 6, 01:25 UTCJul 6, 02:20 UTC55m
2026-07-05 CSN361 CAN → BKK Jul 5, 01:05 UTCJul 5, 14:45 UTC13h 40m
2026-07-04 CSN361 CAN → BKK Jul 4, 15:35 UTCJul 5, 14:45 UTC23h 10m
2026-07-04 CSN5016 - Jul 4, 08:25 UTCJul 5, 01:20 UTC16h 55m
2026-07-04 CSN5015 - Jul 4, 03:25 UTCJul 4, 07:00 UTC3h 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-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 Jul 26, 02:05 UTC.
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 CSN352, CSN3040, CSN5015, CSN361, CSN357.