Apparatus

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sensors Mode-S transponder

781708

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-309L · AIRBUS A-320neo

Hex
781708
Octal
36013410
Decimal
7,870,216
Country
CN
Tail
B-309L
Type
A20N
No current signal · last broadcast 15h ago
Flights observed
85
Distinct callsigns
20
Country
CN
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 781708.

Country allocation

The ICAO 24-bit address 781708 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
CSN638 - 8 2026-07-17
CSN6073 - 7 2026-07-11
CSN688 - 5 2026-07-16
CSN637 - 5 2026-07-17
CSN687 - 4 2026-07-14
CSN6442 China Southern Airlines 4 2026-05-08
CSN8459 China Southern Airlines 3 2026-06-06
CSN8023 - 3 2026-06-18
CSN6851 China Southern Airlines 3 2026-06-04
CSN6620 China Southern Airlines 3 2026-05-20
CSN6168 China Southern Airlines 3 2026-05-19
CSN6074 China Southern Airlines 3 2026-06-13
CSN3605 - 3 2026-07-14
CSN8460 - 2 2026-07-13
CSN8142 - 2 2026-07-15
CSN8141 - 2 2026-07-15
CSN8024 - 2 2026-06-18
CSN6545 China Southern Airlines 2 2026-05-10
CSN6341 - 2 2026-06-25
CSN6194 China Southern Airlines 2 2026-05-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CSN638 - Jul 17, 10:30 UTCJul 17, 11:04 UTC35m
2026-07-17 CSN637 - Jul 17, 05:10 UTCJul 17, 09:15 UTC4h 5m
2026-07-16 CSN688 - Jul 16, 05:40 UTCJul 16, 10:20 UTC4h 40m
2026-07-15 CSN8142 ICN → ICN Jul 15, 12:25 UTCJul 16, 04:05 UTC15h 40m
2026-07-15 CSN8141 ICN → ICN Jul 15, 05:00 UTCJul 15, 11:00 UTC6h 0m
2026-07-14 CSN687 - Jul 14, 10:55 UTCJul 15, 02:40 UTC15h 44m
2026-07-14 CSN3605 - Jul 14, 05:35 UTCJul 14, 05:45 UTC10m
2026-07-14 CSN3605 - Jul 14, 02:55 UTCJul 14, 03:15 UTC20m
2026-07-13 CSN638 - Jul 13, 10:30 UTCJul 13, 10:55 UTC25m
2026-07-13 CSN637 - Jul 13, 08:45 UTCJul 13, 09:10 UTC25m
2026-07-13 CSN8460 - Jul 13, 04:40 UTCJul 13, 05:01 UTC20m
2026-07-12 CSN688 - Jul 12, 05:45 UTCJul 12, 10:15 UTC4h 30m
2026-07-11 CSN6073 - Jul 11, 11:15 UTCJul 12, 04:05 UTC16h 50m
2026-07-11 CSN3605 - Jul 11, 03:01 UTCJul 11, 11:20 UTC8h 20m
2026-07-10 CSN8142 - Jul 10, 12:25 UTCJul 11, 11:20 UTC22h 55m
2026-07-10 CSN8141 ICN → ICN Jul 10, 04:50 UTCJul 10, 10:50 UTC6h 0m
2026-07-10 CSN687 - Jul 10, 01:40 UTCJul 10, 02:30 UTC50m
2026-06-27 CSN8316 HAN → CAN Jun 27, 09:00 UTCJun 27, 14:54 UTC5h 55m
2026-06-27 CSN8315 - Jun 27, 06:15 UTCJun 27, 07:15 UTC1h 0m
2026-06-25 CSN6341 - Jun 25, 00:55 UTCJun 25, 01:04 UTC10m
2026-06-23 CSN6364 - Jun 23, 07:29 UTCJun 23, 07:45 UTC15m
2026-06-21 CSN3606 CAN → CGQ Jun 21, 10:54 UTCJun 21, 11:10 UTC15m
2026-06-18 CSN8024 - Jun 18, 15:35 UTCJun 18, 17:10 UTC1h 35m
2026-06-18 CSN8023 - Jun 18, 11:55 UTCJun 18, 14:10 UTC2h 15m
2026-06-15 CSN638 ICN → CGQ Jun 15, 05:55 UTCJun 15, 06:15 UTC20m
2026-06-15 CSN6073 - Jun 15, 03:10 UTCJun 15, 04:10 UTC1h 0m
2026-06-13 CSN6074 ICN → YNJ Jun 13, 11:15 UTCJun 13, 11:35 UTC20m
2026-06-13 CSN637 CGQ → ICN Jun 13, 09:10 UTCJun 13, 09:30 UTC20m
2026-06-13 CSN688 ICN → CGQ Jun 13, 04:50 UTCJun 13, 08:35 UTC3h 45m
2026-06-13 CSN687 - Jun 13, 02:20 UTCJun 13, 02:40 UTC20m
2026-06-12 CSN638 ICN → CGQ Jun 12, 06:10 UTCJun 13, 01:50 UTC19h 40m
2026-06-12 CSN6073 - Jun 12, 03:45 UTCJun 12, 04:10 UTC25m
2026-06-11 CSN3606 CAN → CGQ Jun 11, 01:50 UTCJun 11, 11:10 UTC9h 20m
2026-06-09 CSN3449 CAN → KMG Jun 9, 07:40 UTCJun 9, 07:50 UTC10m
2026-06-09 - - Jun 9, 04:45 UTCJun 9, 04:55 UTC10m
2026-06-07 CSN3813 CAN → HFE Jun 7, 02:10 UTCJun 7, 02:19 UTC10m
2026-06-06 CSN8459 CGQ → CAN Jun 6, 03:15 UTCJun 6, 03:40 UTC25m
2026-06-04 CSN6851 CGQ → CAN Jun 4, 03:25 UTCJun 4, 14:45 UTC11h 20m
2026-05-31 CSN638 ICN → CGQ May 31, 10:35 UTCMay 31, 10:55 UTC20m
2026-05-31 CSN637 CGQ → ICN May 31, 08:35 UTCMay 31, 09:00 UTC25m
2026-05-30 CSN6851 CGQ → CAN May 30, 07:20 UTCMay 30, 07:45 UTC25m
2026-05-28 CSN8460 CAN → CGQ May 28, 10:45 UTCMay 28, 11:00 UTC15m
2026-05-28 CSN6282 - May 28, 00:20 UTCMay 28, 00:30 UTC10m
2026-05-27 CSN8459 CGQ → CAN May 27, 03:24 UTCMay 27, 03:45 UTC20m
2026-05-21 CSN8024 BKK → CAN May 21, 11:55 UTCMay 21, 12:25 UTC30m
2026-05-21 CSN8023 CAN → BKK May 21, 10:05 UTCMay 21, 10:35 UTC30m
2026-05-21 CSN8023 CAN → BKK May 21, 08:20 UTCMay 21, 08:30 UTC10m
2026-05-20 CSN8459 CGQ → CAN May 20, 14:05 UTCMay 21, 03:30 UTC13h 25m
2026-05-20 CSN6620 ZUH → WUH May 20, 10:10 UTCMay 20, 10:30 UTC20m
2026-05-19 CSN6168 PKX → CGQ May 19, 12:30 UTCMay 20, 01:45 UTC13h 15m

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

Mode-S 781708 frequently asked

What is Mode-S code 781708?
781708 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-309L.
Where is Mode-S 781708 registered?
Mode-S code 781708 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781708 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781708, octal 36013410, decimal 7,870,216.
What flights does 781708 operate?
Mode-S 781708 has broadcast 20 distinct callsigns, including CSN638, CSN6073, CSN688, CSN637, CSN687.