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 3h ago
Flights observed
67
Distinct callsigns
20
Country
CN
Last broadcast
3h ago

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
CSN5919 China Southern Airlines 6 2026-05-08
CSN3459 China Southern Airlines 6 2026-05-09
CSN3744 China Southern Airlines 5 2026-05-30
CSN5974 China Southern Airlines 3 2026-05-26
CSN5300 China Southern Airlines 3 2026-05-28
CSN3906 China Southern Airlines 3 2026-05-20
CSN3743 China Southern Airlines 3 2026-05-30
CSN8635 China Southern Airlines 2 2026-05-19
CSN6086 China Southern Airlines 2 2026-05-27
CSN6085 China Southern Airlines 2 2026-05-26
CSN3615 China Southern Airlines 2 2026-04-30
CSN3039 China Southern Airlines 2 2026-04-29
CSN8598 China Southern Airlines 1 2026-05-04
CSN8326 China Southern Airlines 1 2026-04-20
CSN8214 China Southern Airlines 1 2026-04-25
CSN6586 China Southern Airlines 1 2026-04-25
CSN6253 China Southern Airlines 1 2026-05-04
CSN6208 China Southern Airlines 1 2026-05-17
CSN6154 China Southern Airlines 1 2026-05-09
CSN6153 China Southern Airlines 1 2026-05-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CSN3744 SZX → HRB May 30, 12:00 UTCMay 30, 12:15 UTC15m
2026-05-30 CSN3744 SZX → HRB May 30, 09:35 UTCMay 30, 09:45 UTC10m
2026-05-30 CSN3743 HRB → SZX May 30, 04:20 UTCMay 30, 04:30 UTC10m
2026-05-29 CSN3744 SZX → HRB May 29, 12:00 UTCMay 29, 12:20 UTC20m
2026-05-29 CSN3744 SZX → HRB May 29, 09:45 UTCMay 29, 09:55 UTC10m
2026-05-29 CSN3743 HRB → SZX May 29, 07:15 UTCMay 29, 07:40 UTC25m
2026-05-28 CSN5299 PKX → JHG May 28, 13:05 UTCMay 29, 05:00 UTC15h 55m
2026-05-28 CSN5300 JHG → PKX May 28, 06:00 UTCMay 28, 06:25 UTC25m
2026-05-27 CSN6086 NRT → HRB May 27, 03:59 UTCMay 27, 04:34 UTC35m
2026-05-26 CSN6085 HRB → NRT May 26, 12:54 UTCMay 27, 02:24 UTC13h 30m
2026-05-26 CSN5974 CSX → HRB May 26, 01:10 UTCMay 26, 13:10 UTC12h 0m
2026-05-22 CSN5973 HRB → CSX May 22, 01:05 UTCMay 22, 01:20 UTC15m
2026-05-20 CSN3906 HRB → CAN May 20, 02:15 UTCMay 20, 09:05 UTC6h 51m
2026-05-19 CSN3906 HRB → CAN May 19, 10:05 UTCMay 20, 09:05 UTC23h 1m
2026-05-19 CSN3906 HRB → CAN May 19, 09:55 UTCMay 20, 02:40 UTC16h 45m
2026-05-19 CSN8635 HRB → HGH May 19, 01:30 UTCMay 19, 10:45 UTC9h 15m
2026-05-18 CSN5974 CSX → HRB May 18, 13:05 UTCMay 19, 10:45 UTC21h 39m
2026-05-18 CSN5974 CSX → HRB May 18, 01:25 UTCMay 18, 13:20 UTC11h 55m
2026-05-17 CSN6208 PKX → HRB May 17, 11:10 UTCMay 18, 01:35 UTC14h 25m
2026-05-10 CSN3744 SZX → HRB May 10, 09:35 UTCMay 10, 09:45 UTC10m
2026-05-10 CSN3176 PKX → SZX May 10, 06:59 UTCMay 10, 07:10 UTC10m
2026-05-09 CSN3171 SZX → PKX May 9, 23:50 UTCMay 10, 00:00 UTC10m
2026-05-09 CSN6154 NGB → SZX May 9, 13:20 UTCMay 9, 13:45 UTC25m
2026-05-09 CSN6153 SZX → NGB May 9, 09:00 UTCMay 9, 09:10 UTC10m
2026-05-09 CSN3459 SZX → KMG May 9, 02:15 UTCMay 9, 02:30 UTC15m
2026-05-08 CSN5919 SZX → CKG May 8, 09:14 UTCMay 8, 09:25 UTC10m
2026-05-08 CSN3460 KMG → SZX May 8, 07:04 UTCMay 8, 07:20 UTC15m
2026-05-08 CSN3459 SZX → KMG May 8, 02:04 UTCMay 8, 02:19 UTC15m
2026-05-07 CSN5920 CKG → SZX May 7, 14:50 UTCMay 7, 15:05 UTC15m
2026-05-07 CSN5919 SZX → CKG May 7, 09:10 UTCMay 7, 09:20 UTC10m
2026-05-07 CSN3459 SZX → KMG May 7, 01:50 UTCMay 7, 02:05 UTC15m
2026-05-06 CSN5919 SZX → CKG May 6, 09:15 UTCMay 6, 09:25 UTC10m
2026-05-06 CSN3459 SZX → KMG May 6, 02:01 UTCMay 6, 02:15 UTC15m
2026-05-05 CSN5919 SZX → CKG May 5, 09:15 UTCMay 5, 09:30 UTC15m
2026-05-05 CSN3459 SZX → KMG May 5, 02:10 UTCMay 5, 02:30 UTC20m
2026-05-04 CSN3955 SZX → HAK May 4, 13:20 UTCMay 4, 13:35 UTC15m
2026-05-04 CSN8598 HGH → SZX May 4, 10:15 UTCMay 4, 10:30 UTC15m
2026-05-04 CSN6253 SZX → HAK May 4, 00:10 UTCMay 4, 00:25 UTC15m
2026-05-03 CSN5919 SZX → CKG May 3, 09:20 UTCMay 3, 09:35 UTC15m
2026-05-03 CSN3459 SZX → KMG May 3, 02:00 UTCMay 3, 02:15 UTC15m
2026-05-02 CSN3272 CGO → SZX May 2, 13:20 UTCMay 2, 13:45 UTC25m
2026-05-02 CSN3271 SZX → CGO May 2, 07:50 UTCMay 2, 08:05 UTC15m
2026-05-02 CSN3966 SHA → SZX May 2, 05:40 UTCMay 2, 05:50 UTC10m
2026-05-02 CSN3965 SZX → SHA May 2, 00:20 UTCMay 2, 00:30 UTC10m
2026-05-01 CSN5919 SZX → CKG May 1, 09:25 UTCMay 1, 09:35 UTC10m
2026-05-01 CSN3743 HRB → SZX May 1, 07:00 UTCMay 1, 07:10 UTC10m
2026-04-30 CSN3905 CAN → HRB Apr 30, 14:10 UTCMay 1, 04:35 UTC14h 25m
2026-04-30 CSN3616 HRB → CAN Apr 30, 06:55 UTCMay 1, 04:35 UTC21h 40m
2026-04-30 CSN3615 CAN → HRB Apr 30, 02:55 UTCApr 30, 14:25 UTC11h 30m
2026-04-29 CSN3040 SIN → CAN Apr 29, 12:00 UTCApr 29, 12:15 UTC15m

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 3h ago.
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 CSN5919, CSN3459, CSN3744, CSN5974, CSN5300.