Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781623

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-306M · AIRBUS A-320neo

Hex
781623
Octal
36013043
Decimal
7,869,987
Country
CN
Tail
B-306M
Type
A20N
No current signal · last broadcast Jul 26, 11:15 UTC
Flights observed
112
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 11:15 UTC

Last known position

Most recent position reported by Mode-S 781623.

Country allocation

The ICAO 24-bit address 781623 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
CSN3605 China Southern Airlines 10 2026-07-04
CSN637 China Southern Airlines 9 2026-07-25
CSN6074 China Southern Airlines 9 2026-07-22
CSN6073 China Southern Airlines 9 2026-07-23
CSN688 - 7 2026-07-20
CSN687 China Southern Airlines 6 2026-07-19
CSN638 China Southern Airlines 6 2026-07-25
CSN3606 China Southern Airlines 6 2026-07-26
CSN6851 China Southern Airlines 5 2026-06-06
CSN6358 - 4 2026-07-09
CSN6357 - 4 2026-07-09
CSN6341 China Southern Airlines 4 2026-06-04
CSN8459 China Southern Airlines 3 2026-07-24
CSN6545 China Southern Airlines 3 2026-04-23
CSN6168 - 3 2026-06-29
CSN6852 China Southern Airlines 2 2026-05-06
CSN6553 China Southern Airlines 2 2026-07-21
CSN6442 China Southern Airlines 2 2026-04-24
CSN6377 China Southern Airlines 2 2026-06-05
CSN6194 China Southern Airlines 2 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN3606 CAN → CGQ Jul 26, 02:50 UTCJul 26, 11:15 UTC8h 26m
2026-07-25 CSN638 ICN → CGQ Jul 25, 10:25 UTCJul 26, 03:05 UTC16h 40m
2026-07-25 CSN637 CGQ → ICN Jul 25, 04:30 UTCJul 25, 09:15 UTC4h 45m
2026-07-24 CSN637 CGQ → ICN Jul 24, 10:50 UTCJul 25, 09:15 UTC22h 25m
2026-07-24 CSN8459 CGQ → CAN Jul 24, 10:20 UTCJul 25, 08:40 UTC22h 20m
2026-07-24 CSN8459 CGQ → CAN Jul 24, 05:45 UTCJul 25, 04:40 UTC22h 55m
2026-07-23 CSN6073 YNJ → ICN Jul 23, 10:45 UTCJul 24, 04:10 UTC17h 25m
2026-07-22 CSN8142 ICN → YNJ Jul 22, 12:35 UTCJul 23, 03:15 UTC14h 40m
2026-07-22 CSN6074 ICN → YNJ Jul 22, 04:50 UTCJul 22, 10:25 UTC5h 35m
2026-07-21 CSN6553 CGQ → PVG Jul 21, 09:50 UTCJul 22, 02:45 UTC16h 55m
2026-07-21 CSN6553 CGQ → PVG Jul 21, 06:05 UTCJul 22, 02:45 UTC20h 40m
2026-07-20 CSN688 - Jul 20, 06:00 UTCJul 20, 11:05 UTC5h 5m
2026-07-19 CSN6073 YNJ → ICN Jul 19, 12:25 UTCJul 20, 04:30 UTC16h 5m
2026-07-19 CSN8141 YNJ → ICN Jul 19, 04:30 UTCJul 19, 10:45 UTC6h 15m
2026-07-19 CSN687 CGQ → ICN Jul 19, 01:40 UTCJul 19, 02:40 UTC1h 0m
2026-07-18 CSN687 CGQ → ICN Jul 18, 06:40 UTCJul 19, 02:40 UTC20h 0m
2026-07-16 CSN638 - Jul 16, 10:40 UTCJul 16, 11:05 UTC25m
2026-07-16 CSN637 - Jul 16, 05:05 UTCJul 16, 08:55 UTC3h 50m
2026-07-15 CSN8459 - Jul 15, 09:55 UTCJul 16, 05:25 UTC19h 30m
2026-07-15 CSN688 - Jul 15, 05:50 UTCJul 15, 06:05 UTC15m
2026-07-14 CSN6073 - Jul 14, 15:20 UTCJul 15, 04:05 UTC12h 44m
2026-07-14 CSN6073 - Jul 14, 04:50 UTCJul 15, 04:05 UTC23h 14m
2026-07-14 CSN6074 - Jul 14, 04:30 UTCJul 14, 15:20 UTC10h 50m
2026-07-14 CSN687 - Jul 14, 02:20 UTCJul 14, 02:40 UTC20m
2026-07-09 CSN6179 - Jul 9, 12:50 UTCJul 9, 13:00 UTC10m
2026-07-09 CSN6358 - Jul 9, 09:05 UTCJul 9, 09:25 UTC20m
2026-07-09 CSN6358 - Jul 9, 06:30 UTCJul 9, 06:45 UTC15m
2026-07-09 CSN6357 - Jul 9, 03:55 UTCJul 9, 04:20 UTC25m
2026-07-09 CSN6357 - Jul 9, 01:35 UTCJul 9, 01:50 UTC15m
2026-07-04 CSN3605 CGQ → CAN Jul 4, 02:55 UTCJul 4, 12:00 UTC9h 5m
2026-07-03 CSN3606 CAN → CGQ Jul 3, 11:30 UTCJul 4, 03:10 UTC15h 40m
2026-07-03 CSN3606 CAN → CGQ Jul 3, 03:20 UTCJul 3, 11:50 UTC8h 30m
2026-07-02 CSN3606 CAN → CGQ Jul 2, 12:50 UTCJul 3, 11:50 UTC23h 0m
2026-07-02 CSN3606 CAN → CGQ Jul 2, 12:30 UTCJul 3, 03:35 UTC15h 5m
2026-07-01 CSN3606 CAN → CGQ Jul 1, 10:55 UTCJul 1, 11:10 UTC15m
2026-07-01 CSN3605 CGQ → CAN Jul 1, 05:30 UTCJul 1, 05:50 UTC20m
2026-07-01 CSN3605 CGQ → CAN Jul 1, 02:55 UTCJul 1, 03:15 UTC20m
2026-06-30 CSN6074 - Jun 30, 10:30 UTCJun 30, 10:45 UTC15m
2026-06-30 CSN637 - Jun 30, 08:40 UTCJun 30, 09:00 UTC20m
2026-06-30 CSN688 - Jun 30, 04:45 UTCJun 30, 08:05 UTC3h 20m
2026-06-30 CSN687 - Jun 30, 02:25 UTCJun 30, 02:45 UTC20m
2026-06-29 CSN6168 - Jun 29, 12:39 UTCJun 29, 12:49 UTC10m
2026-06-29 CSN638 - Jun 29, 05:45 UTCJun 29, 06:05 UTC20m
2026-06-28 CSN6073 - Jun 28, 11:35 UTCJun 29, 03:54 UTC16h 20m
2026-06-26 CSN6074 - Jun 26, 10:35 UTCJun 27, 04:19 UTC17h 45m
2026-06-26 CSN637 - Jun 26, 08:34 UTCJun 26, 09:00 UTC25m
2026-06-26 CSN688 - Jun 26, 04:55 UTCJun 26, 05:10 UTC15m
2026-06-26 CSN687 - Jun 26, 02:09 UTCJun 26, 02:30 UTC20m
2026-06-24 CSN6194 PKX → CGQ Jun 24, 09:15 UTCJun 24, 09:24 UTC10m
2026-06-13 CSN3605 CGQ → CAN Jun 13, 06:00 UTCJun 13, 06:10 UTC10m

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-306M page for operator, model, and routing details .

Mode-S 781623 frequently asked

What is Mode-S code 781623?
781623 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-306M.
Where is Mode-S 781623 registered?
Mode-S code 781623 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781623 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 11:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781623, octal 36013043, decimal 7,869,987.
What flights does 781623 operate?
Mode-S 781623 has broadcast 20 distinct callsigns, including CSN3605, CSN637, CSN6074, CSN6073, CSN688.