Apparatus

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sensors Mode-S transponder

781D13

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-328A · AIRBUS A-319neo

Hex
781D13
Octal
36016423
Decimal
7,871,763
Country
CN
Tail
B-328A
Type
A19N
No current signal · last broadcast 12h ago
Flights observed
61
Distinct callsigns
20
Country
CN
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 781D13.

Country allocation

The ICAO 24-bit address 781D13 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
CSN3433 - 9 2026-06-27
CSN5417 - 8 2026-06-16
CSN3434 - 6 2026-06-27
CSN6068 - 4 2026-07-15
CSN6067 - 4 2026-07-15
CSN6595 - 3 2026-06-20
CSN5943 - 2 2026-07-20
CSN5418 - 2 2026-06-16
CSN3996 - 2 2026-07-16
CSN3923 China Southern Airlines 2 2026-06-03
CSN3339 - 2 2026-06-03
CSN8661 - 1 2026-06-28
CSN8226 - 1 2026-04-19
CSN6760 China Southern Airlines 1 2026-05-20
CSN6759 China Southern Airlines 1 2026-05-20
CSN6586 China Southern Airlines 1 2026-04-20
CSN6290 - 1 2026-07-20
CSN5557 China Southern Airlines 1 2026-05-26
CSN3995 - 1 2026-07-15
CSN3950 China Southern Airlines 1 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 CSN5943 - Jul 20, 11:00 UTCJul 20, 11:25 UTC25m
2026-07-20 CSN6290 - Jul 20, 09:15 UTCJul 20, 09:25 UTC10m
2026-07-16 CSN3996 - Jul 16, 00:05 UTCJul 16, 00:15 UTC10m
2026-07-15 CSN3995 - Jul 15, 13:25 UTCJul 15, 13:35 UTC10m
2026-07-15 CSN6068 - Jul 15, 06:40 UTCJul 15, 08:40 UTC2h 0m
2026-07-15 CSN6067 - Jul 15, 03:00 UTCJul 15, 04:35 UTC1h 35m
2026-07-10 CSN3638 - Jul 10, 14:30 UTCJul 10, 14:40 UTC10m
2026-07-10 CSN3493 - Jul 10, 02:20 UTCJul 10, 02:30 UTC10m
2026-07-06 CSN6068 - Jul 6, 06:30 UTCJul 6, 08:10 UTC1h 40m
2026-07-06 CSN6067 - Jul 6, 03:45 UTCJul 6, 05:20 UTC1h 35m
2026-07-05 CSN6068 - Jul 5, 06:35 UTCJul 5, 08:30 UTC1h 55m
2026-07-05 CSN6067 - Jul 5, 03:05 UTCJul 5, 04:45 UTC1h 40m
2026-07-02 CSN3996 - Jul 2, 00:00 UTCJul 2, 00:10 UTC10m
2026-07-01 CSN6068 - Jul 1, 06:30 UTCJul 1, 09:35 UTC3h 5m
2026-07-01 CSN6067 - Jul 1, 01:15 UTCJul 1, 04:45 UTC3h 30m
2026-06-28 CSN8661 - Jun 28, 10:04 UTCJun 29, 06:05 UTC20h 0m
2026-06-27 CSN3434 - Jun 27, 16:49 UTCJun 27, 16:59 UTC10m
2026-06-27 CSN3433 - Jun 27, 10:25 UTCJun 27, 10:45 UTC20m
2026-06-25 CSN5943 - Jun 25, 01:40 UTCJun 25, 02:45 UTC1h 5m
2026-06-21 CSN3637 CAN → NTG Jun 21, 10:19 UTCJun 21, 10:29 UTC10m
2026-06-20 CSN6595 - Jun 20, 01:19 UTCJun 20, 02:19 UTC1h 0m
2026-06-16 CSN5417 - Jun 16, 22:45 UTCJun 16, 23:05 UTC20m
2026-06-16 CSN3434 CTU → SZX Jun 16, 17:49 UTCJun 16, 17:59 UTC10m
2026-06-16 CSN3433 - Jun 16, 10:25 UTCJun 16, 10:35 UTC10m
2026-06-16 CSN5418 - Jun 16, 06:54 UTCJun 16, 07:05 UTC10m
2026-06-11 CSN5417 SZX → LZY Jun 11, 22:55 UTCJun 11, 23:10 UTC15m
2026-06-11 CSN3434 CTU → SZX Jun 11, 16:35 UTCJun 11, 16:45 UTC10m
2026-06-11 CSN3433 SZX → CTU Jun 11, 10:10 UTCJun 11, 10:25 UTC15m
2026-06-10 CSN3423 - Jun 10, 03:15 UTCJun 10, 04:05 UTC50m
2026-06-03 CSN3339 - Jun 3, 07:25 UTCJun 3, 07:35 UTC10m
2026-06-03 CSN3923 CAN → ACX Jun 3, 01:25 UTCJun 3, 02:15 UTC50m
2026-05-29 CSN3708 TNA → CAN May 29, 19:15 UTCMay 29, 19:30 UTC15m
2026-05-28 CSN3950 CKG → CAN May 28, 02:00 UTCMay 28, 02:10 UTC10m
2026-05-26 CSN5557 CAN → YIH May 26, 01:14 UTCMay 26, 01:30 UTC15m
2026-05-24 CSN3949 CAN → CKG May 24, 15:10 UTCMay 24, 15:20 UTC10m
2026-05-23 CSN5417 SZX → LZY May 23, 22:45 UTCMay 23, 23:00 UTC15m
2026-05-23 CSN3433 SZX → CTU May 23, 10:30 UTCMay 23, 10:45 UTC15m
2026-05-22 CSN6595 CAN → DLU May 22, 01:05 UTCMay 22, 01:20 UTC15m
2026-05-21 CSN3506 FOC → CAN May 21, 06:20 UTCMay 21, 06:35 UTC15m
2026-05-20 CSN6760 SYX → CAN May 20, 12:00 UTCMay 20, 12:10 UTC10m
2026-05-20 CSN6759 CAN → SYX May 20, 08:10 UTCMay 20, 08:30 UTC20m
2026-05-16 CSN5417 SZX → LZY May 16, 22:45 UTCMay 16, 23:00 UTC15m
2026-05-16 CSN3433 SZX → CTU May 16, 10:11 UTCMay 16, 10:20 UTC10m
2026-05-16 CSN5418 LZY → SZX May 16, 06:16 UTCMay 16, 06:25 UTC10m
2026-05-14 CSN6595 CAN → DLU May 14, 02:30 UTCMay 14, 02:45 UTC15m
2026-05-13 CSN3339 - May 13, 07:25 UTCMay 13, 07:40 UTC15m
2026-05-07 CSN5417 SZX → LZY May 7, 22:40 UTCMay 7, 22:50 UTC10m
2026-05-07 CSN3433 SZX → CTU May 7, 10:05 UTCMay 7, 10:20 UTC15m
2026-05-05 CSN5417 SZX → LZY May 5, 22:45 UTCMay 5, 22:55 UTC10m
2026-05-05 CSN3434 CTU → SZX May 5, 15:30 UTCMay 5, 15:40 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-328A page for operator, model, and routing details .

Mode-S 781D13 frequently asked

What is Mode-S code 781D13?
781D13 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-328A.
Where is Mode-S 781D13 registered?
Mode-S code 781D13 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781D13 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781D13, octal 36016423, decimal 7,871,763.
What flights does 781D13 operate?
Mode-S 781D13 has broadcast 20 distinct callsigns, including CSN3433, CSN5417, CSN3434, CSN6068, CSN6067.