Apparatus

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sensors Mode-S transponder

781620

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-306J · AIRBUS A-321neo

Hex
781620
Octal
36013040
Decimal
7,869,984
Country
CN
Tail
B-306J
Type
A21N
No current signal · last broadcast Jul 26, 15:15 UTC
Flights observed
155
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 15:15 UTC

Last known position

Most recent position reported by Mode-S 781620.

Country allocation

The ICAO 24-bit address 781620 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
CSN6277 China Southern Airlines 8 2026-07-26
CSN3744 - 8 2026-06-26
CSN3615 - 8 2026-07-14
CSN8635 - 7 2026-07-19
CSN5919 China Southern Airlines 6 2026-05-08
CSN3459 China Southern Airlines 6 2026-05-09
CSN6141 - 5 2026-07-16
CSN3906 - 5 2026-06-21
CSN3905 China Southern Airlines 5 2026-06-22
CSN3624 - 5 2026-07-13
CSN6259 China Southern Airlines 4 2026-07-19
CSN6086 - 4 2026-07-12
CSN6085 - 4 2026-07-11
CSN5300 China Southern Airlines 4 2026-07-23
CSN3743 - 4 2026-06-25
CSN6274 - 3 2026-07-01
CSN5974 China Southern Airlines 3 2026-05-26
CSN5973 - 3 2026-07-05
CSN3616 China Southern Airlines 3 2026-06-11
CSN3040 China Southern Airlines 3 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN6278 JHG → CAN Jul 26, 14:55 UTCJul 26, 15:15 UTC20m
2026-07-26 CSN6277 HRB → TNA Jul 26, 01:35 UTCJul 26, 01:45 UTC10m
2026-07-25 CSN6251 HRB → PVG Jul 25, 03:35 UTCJul 25, 10:45 UTC7h 10m
2026-07-24 CSN6148 HRB → SYX Jul 24, 09:30 UTCJul 25, 06:35 UTC21h 5m
2026-07-23 CSN6148 HRB → SYX Jul 23, 14:30 UTCJul 24, 10:00 UTC19h 30m
2026-07-23 CSN5300 JHG → PKX Jul 23, 07:55 UTCJul 24, 01:10 UTC17h 15m
2026-07-23 CSN5983 PKX → HRB Jul 23, 03:50 UTCJul 23, 04:05 UTC15m
2026-07-22 CSN6296 CGO → HRB Jul 22, 01:10 UTCJul 22, 05:25 UTC4h 15m
2026-07-21 CSN6295 - Jul 21, 14:20 UTCJul 21, 14:30 UTC10m
2026-07-21 CSN5589 - Jul 21, 01:00 UTCJul 21, 11:05 UTC10h 5m
2026-07-20 CSN6295 - Jul 20, 14:05 UTCJul 20, 14:15 UTC10m
2026-07-20 CSN3623 CAN → HRB Jul 20, 09:25 UTCJul 20, 09:35 UTC10m
2026-07-19 CSN8635 - Jul 19, 10:15 UTCJul 20, 02:25 UTC16h 10m
2026-07-19 CSN6259 HRB → HGH Jul 19, 01:25 UTCJul 19, 15:20 UTC13h 55m
2026-07-18 CSN6259 HRB → HGH Jul 18, 12:50 UTCJul 19, 10:55 UTC22h 5m
2026-07-18 CSN6259 HRB → HGH Jul 18, 06:10 UTCJul 19, 02:10 UTC20h 0m
2026-07-18 CSN5983 - Jul 18, 01:54 UTCJul 18, 02:09 UTC15m
2026-07-16 CSN6256 TFU → HRB Jul 16, 15:14 UTCJul 17, 09:50 UTC18h 35m
2026-07-16 CSN6141 - Jul 16, 10:04 UTCJul 17, 09:50 UTC23h 45m
2026-07-16 CSN6141 - Jul 16, 01:20 UTCJul 16, 15:14 UTC13h 55m
2026-07-15 CSN6141 - Jul 15, 15:15 UTCJul 16, 10:35 UTC19h 20m
2026-07-15 CSN8635 - Jul 15, 10:05 UTCJul 16, 10:00 UTC23h 55m
2026-07-15 CSN8635 - Jul 15, 01:10 UTCJul 15, 15:40 UTC14h 30m
2026-07-14 CSN8635 - Jul 14, 14:05 UTCJul 15, 10:50 UTC20h 44m
2026-07-14 CSN6259 - Jul 14, 07:25 UTCJul 15, 01:55 UTC18h 29m
2026-07-14 CSN3615 - Jul 14, 03:25 UTCJul 15, 01:55 UTC22h 29m
2026-07-13 CSN3624 - Jul 13, 18:20 UTCJul 13, 18:30 UTC10m
2026-07-13 CSN3624 - Jul 13, 13:35 UTCJul 13, 13:50 UTC15m
2026-07-12 CSN3624 - Jul 12, 14:05 UTCJul 13, 13:50 UTC23h 45m
2026-07-12 CSN6086 - Jul 12, 04:15 UTCJul 12, 14:05 UTC9h 50m
2026-07-11 CSN6085 - Jul 11, 14:55 UTCJul 12, 02:15 UTC11h 20m
2026-07-11 CSN6277 - Jul 11, 01:15 UTCJul 11, 01:25 UTC10m
2026-07-09 CSN6277 - Jul 9, 01:20 UTCJul 9, 16:15 UTC14h 55m
2026-07-08 CSN6277 - Jul 8, 15:25 UTCJul 9, 01:30 UTC10h 5m
2026-07-08 CSN6277 - Jul 8, 01:20 UTCJul 8, 01:30 UTC10m
2026-07-07 CSN6202 - Jul 7, 17:05 UTCJul 7, 17:20 UTC15m
2026-07-07 CSN6218 - Jul 7, 10:50 UTCJul 7, 11:00 UTC10m
2026-07-07 CSN6204 - Jul 7, 00:45 UTCJul 7, 00:55 UTC10m
2026-07-05 CSN5973 - Jul 5, 01:15 UTCJul 5, 01:25 UTC10m
2026-07-04 CSN6220 - Jul 4, 04:15 UTCJul 5, 01:25 UTC21h 10m
2026-07-02 CSN6202 - Jul 2, 14:45 UTCJul 2, 14:55 UTC10m
2026-07-02 CSN6218 - Jul 2, 08:10 UTCJul 2, 08:25 UTC15m
2026-07-02 CSN6204 - Jul 2, 00:55 UTCJul 2, 01:05 UTC10m
2026-07-01 CSN6274 - Jul 1, 09:15 UTCJul 1, 09:30 UTC15m
2026-07-01 CSN6274 - Jul 1, 06:50 UTCJul 1, 07:05 UTC15m
2026-07-01 CSN5862 - Jul 1, 04:40 UTCJul 1, 04:50 UTC10m
2026-06-30 CSN5861 - Jun 30, 23:20 UTCJun 30, 23:35 UTC15m
2026-06-30 CSN3920 NNY → SZX Jun 30, 16:40 UTCJun 30, 17:00 UTC20m
2026-06-30 CSN3919 SZX → NNY Jun 30, 12:20 UTCJun 30, 12:30 UTC10m
2026-06-30 CSN8477 - Jun 30, 02:55 UTCJun 30, 03:05 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-306J page for operator, model, and routing details .

Mode-S 781620 frequently asked

What is Mode-S code 781620?
781620 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-306J.
Where is Mode-S 781620 registered?
Mode-S code 781620 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781620 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781620, octal 36013040, decimal 7,869,984.
What flights does 781620 operate?
Mode-S 781620 has broadcast 20 distinct callsigns, including CSN6277, CSN3744, CSN3615, CSN8635, CSN5919.