Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781665

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-307L · AIRBUS A-321neo

Hex
781665
Octal
36013145
Decimal
7,870,053
Country
CN
Tail
B-307L
Type
A21N
No current signal · last broadcast 36m ago
Flights observed
99
Distinct callsigns
20
Country
CN
Last broadcast
36m ago

Last known position

Most recent position reported by Mode-S 781665.

Country allocation

The ICAO 24-bit address 781665 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
CSN6553 - 16 2026-07-17
CSN624 - 16 2026-07-12
CSN623 - 15 2026-07-12
CSN6405 China Southern Airlines 8 2026-06-29
CSN6545 - 5 2026-06-25
CSN6146 China Southern Airlines 5 2026-07-18
CSN6610 China Southern Airlines 4 2026-04-30
CSN6155 - 3 2026-07-18
CSN6609 China Southern Airlines 2 2026-04-30
CSN6541 China Southern Airlines 2 2026-06-10
CSN6460 China Southern Airlines 2 2026-04-20
CSN6364 China Southern Airlines 2 2026-04-29
CSN6358 China Southern Airlines 2 2026-04-24
CSN6194 China Southern Airlines 2 2026-05-29
CSN6180 China Southern Airlines 2 2026-04-30
CSN8460 China Southern Airlines 1 2026-05-21
CSN8459 China Southern Airlines 1 2026-05-20
CSN6852 - 1 2026-06-22
CSN6851 - 1 2026-06-21
CSN6542 - 1 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 CSN6155 - Jul 18, 07:40 UTCJul 18, 16:45 UTC9h 5m
2026-07-18 CSN6146 PKX → CGQ Jul 18, 03:50 UTCJul 18, 04:00 UTC10m
2026-07-17 CSN6553 - Jul 17, 01:35 UTCJul 17, 10:10 UTC8h 35m
2026-07-14 CSN2988 - Jul 14, 19:50 UTCJul 14, 21:25 UTC1h 35m
2026-07-14 CSN2987 - Jul 14, 15:30 UTCJul 14, 15:45 UTC15m
2026-07-12 CSN624 - Jul 12, 04:30 UTCJul 12, 10:10 UTC5h 40m
2026-07-12 CSN623 - Jul 12, 01:45 UTCJul 12, 02:25 UTC40m
2026-07-09 CSN624 - Jul 9, 04:40 UTCJul 9, 10:45 UTC6h 5m
2026-07-09 CSN623 - Jul 9, 01:45 UTCJul 9, 02:25 UTC40m
2026-07-07 CSN6542 - Jul 7, 03:50 UTCJul 7, 08:55 UTC5h 5m
2026-07-06 CSN6155 - Jul 6, 07:25 UTCJul 7, 03:55 UTC20h 30m
2026-07-06 CSN6146 - Jul 6, 03:50 UTCJul 6, 08:10 UTC4h 20m
2026-07-05 CSN624 - Jul 5, 04:35 UTCJul 5, 10:10 UTC5h 35m
2026-07-05 CSN623 - Jul 5, 01:50 UTCJul 5, 02:40 UTC50m
2026-07-02 CSN624 - Jul 2, 04:30 UTCJul 2, 10:05 UTC5h 35m
2026-07-02 CSN623 - Jul 2, 01:50 UTCJul 2, 02:35 UTC45m
2026-06-29 CSN6553 - Jun 29, 14:14 UTCJun 30, 09:40 UTC19h 26m
2026-06-29 CSN6405 CGQ → HGH Jun 29, 00:10 UTCJun 29, 14:14 UTC14h 5m
2026-06-28 CSN6405 CGQ → HGH Jun 28, 08:55 UTCJun 29, 00:54 UTC16h 0m
2026-06-28 CSN6405 CGQ → HGH Jun 28, 00:15 UTCJun 28, 09:05 UTC8h 50m
2026-06-26 CSN6405 CGQ → HGH Jun 26, 00:24 UTCJun 26, 09:10 UTC8h 45m
2026-06-25 CSN6405 CGQ → HGH Jun 25, 09:14 UTCJun 26, 00:45 UTC15h 30m
2026-06-25 CSN6545 - Jun 25, 00:19 UTCJun 25, 09:14 UTC8h 55m
2026-06-23 CSN6553 CGQ → PVG Jun 23, 09:34 UTCJun 24, 01:04 UTC15h 30m
2026-06-23 CSN6553 CGQ → PVG Jun 23, 01:30 UTCJun 24, 01:04 UTC23h 35m
2026-06-22 CSN6553 CGQ → PVG Jun 22, 14:40 UTCJun 23, 10:24 UTC19h 45m
2026-06-22 CSN6852 - Jun 22, 07:34 UTCJun 23, 02:15 UTC18h 40m
2026-06-21 CSN6851 - Jun 21, 09:24 UTCJun 22, 07:45 UTC22h 20m
2026-06-21 CSN6405 CGQ → HGH Jun 21, 00:14 UTCJun 21, 09:35 UTC9h 20m
2026-06-20 CSN6155 - Jun 20, 07:04 UTCJun 21, 01:05 UTC18h 0m
2026-06-20 CSN6146 - Jun 20, 03:54 UTCJun 20, 07:39 UTC3h 45m
2026-06-18 CSN624 - Jun 18, 04:50 UTCJun 18, 09:45 UTC4h 55m
2026-06-17 CSN623 - Jun 17, 09:25 UTCJun 18, 02:40 UTC17h 15m
2026-06-17 CSN6545 - Jun 17, 00:10 UTCJun 17, 09:35 UTC9h 25m
2026-06-14 CSN624 NRT → CGQ Jun 14, 04:35 UTCJun 14, 10:05 UTC5h 30m
2026-06-14 CSN623 CGQ → NRT Jun 14, 01:55 UTCJun 14, 02:30 UTC35m
2026-06-12 CSN6405 CGQ → HGH Jun 12, 00:15 UTCJun 12, 09:30 UTC9h 16m
2026-06-11 CSN624 NRT → CGQ Jun 11, 04:30 UTCJun 12, 00:25 UTC19h 55m
2026-06-10 CSN623 CGQ → NRT Jun 10, 10:15 UTCJun 11, 02:35 UTC16h 20m
2026-06-10 CSN6541 CGQ → PVG Jun 10, 01:30 UTCJun 10, 10:30 UTC9h 0m
2026-06-09 CSN6553 CGQ → PVG Jun 9, 09:30 UTCJun 10, 02:05 UTC16h 35m
2026-06-09 CSN6553 CGQ → PVG Jun 9, 02:10 UTCJun 9, 10:05 UTC7h 55m
2026-06-06 CSN6342 CAN → CGQ Jun 6, 08:35 UTCJun 6, 08:50 UTC15m
2026-06-05 CSN6341 CGQ → CAN Jun 5, 09:40 UTCJun 6, 01:45 UTC16h 5m
2026-06-05 CSN6545 CGQ → HGH Jun 5, 00:15 UTCJun 5, 09:40 UTC9h 25m
2026-06-04 CSN6545 CGQ → HGH Jun 4, 09:35 UTCJun 5, 01:05 UTC15h 30m
2026-06-04 CSN624 NRT → CGQ Jun 4, 04:30 UTCJun 5, 01:05 UTC20h 35m
2026-06-03 CSN623 CGQ → NRT Jun 3, 11:05 UTCJun 4, 02:25 UTC15h 20m
2026-06-01 CSN6553 CGQ → PVG Jun 1, 01:40 UTCJun 1, 10:10 UTC8h 30m
2026-05-31 CSN6553 CGQ → PVG May 31, 09:30 UTCJun 1, 01:50 UTC16h 20m

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-307L page for operator, model, and routing details .

Mode-S 781665 frequently asked

What is Mode-S code 781665?
781665 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-307L.
Where is Mode-S 781665 registered?
Mode-S code 781665 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781665 broadcasting right now?
No active broadcast right now. Last signal was 36m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781665, octal 36013145, decimal 7,870,053.
What flights does 781665 operate?
Mode-S 781665 has broadcast 20 distinct callsigns, including CSN6553, CSN624, CSN623, CSN6405, CSN6545.