Apparatus

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sensors Mode-S transponder

781B8D

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-323S · AIRBUS A-321neo

Hex
781B8D
Octal
36015615
Decimal
7,871,373
Country
CN
Tail
B-323S
Type
A21N
No current signal · last broadcast 14h ago
Flights observed
100
Distinct callsigns
20
Country
CN
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 781B8D.

Country allocation

The ICAO 24-bit address 781B8D 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
CSN317 - 13 2026-07-17
CSN318 - 12 2026-07-15
CSN356 - 10 2026-07-14
CSN355 - 10 2026-07-14
CSN5067 - 9 2026-07-14
CSN5068 - 7 2026-07-14
CSN5098 - 6 2026-07-10
CSN5097 - 6 2026-07-10
CSN8871 - 3 2026-07-05
CSN8930 - 2 2026-06-20
CSN8568 China Southern Airlines 2 2026-07-06
CSN8010 - 2 2026-07-17
CSN8009 - 2 2026-07-17
CSN6028 China Southern Airlines 2 2026-06-06
CSN8996 - 1 2026-07-07
CSN8995 - 1 2026-07-06
CSN8922 - 1 2026-07-12
CSN8909 China Southern Airlines 1 2026-04-26
CSN8848 China Southern Airlines 1 2026-06-04
CSN8844 - 1 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CSN8010 - Jul 17, 16:04 UTCJul 17, 17:20 UTC1h 15m
2026-07-17 CSN8009 GMP → DAC Jul 17, 05:10 UTCJul 17, 13:50 UTC8h 40m
2026-07-17 CSN317 - Jul 17, 02:25 UTCJul 17, 02:54 UTC30m
2026-07-16 CSN8844 - Jul 16, 13:05 UTCJul 16, 13:20 UTC15m
2026-07-15 CSN318 - Jul 15, 05:00 UTCJul 15, 05:25 UTC25m
2026-07-15 CSN317 - Jul 15, 02:25 UTCJul 15, 02:55 UTC30m
2026-07-14 CSN5068 - Jul 14, 21:45 UTCJul 14, 22:00 UTC15m
2026-07-14 CSN5067 - Jul 14, 10:40 UTCJul 14, 10:50 UTC10m
2026-07-14 CSN356 - Jul 14, 06:05 UTCJul 14, 06:20 UTC15m
2026-07-14 CSN355 - Jul 14, 03:40 UTCJul 14, 04:10 UTC30m
2026-07-12 CSN8922 - Jul 12, 07:35 UTCJul 12, 07:50 UTC15m
2026-07-11 CSN8567 - Jul 11, 09:15 UTCJul 11, 09:30 UTC15m
2026-07-11 CSN318 - Jul 11, 04:40 UTCJul 11, 05:01 UTC20m
2026-07-11 CSN317 - Jul 11, 02:30 UTCJul 11, 02:50 UTC20m
2026-07-10 CSN5098 - Jul 10, 21:40 UTCJul 10, 21:50 UTC10m
2026-07-10 CSN5097 - Jul 10, 11:00 UTCJul 10, 11:20 UTC20m
2026-07-10 CSN356 - Jul 10, 06:00 UTCJul 10, 06:15 UTC15m
2026-07-10 CSN355 - Jul 10, 03:30 UTCJul 10, 04:05 UTC35m
2026-07-08 CSN8010 - Jul 8, 16:00 UTCJul 8, 17:05 UTC1h 5m
2026-07-08 CSN8009 - Jul 8, 12:30 UTCJul 8, 13:40 UTC1h 10m
2026-07-07 CSN6588 - Jul 7, 14:35 UTCJul 7, 14:45 UTC10m
2026-07-07 CSN8996 - Jul 7, 07:25 UTCJul 7, 08:05 UTC40m
2026-07-06 CSN8995 - Jul 6, 23:20 UTCJul 6, 23:40 UTC20m
2026-07-06 CSN8568 KMG → PKX Jul 6, 14:05 UTCJul 6, 14:20 UTC15m
2026-07-05 CSN8871 - Jul 5, 13:15 UTCJul 5, 13:45 UTC30m
2026-07-04 CSN5098 ALA → PKX Jul 4, 21:30 UTCJul 4, 21:40 UTC10m
2026-07-04 CSN5097 - Jul 4, 10:55 UTCJul 4, 11:05 UTC10m
2026-07-03 CSN318 - Jul 3, 04:45 UTCJul 3, 05:10 UTC25m
2026-07-03 CSN317 - Jul 3, 02:35 UTCJul 3, 02:55 UTC20m
2026-07-02 CSN5067 - Jul 2, 10:40 UTCJul 2, 21:50 UTC11h 10m
2026-07-02 CSN356 - Jul 2, 06:00 UTCJul 2, 06:20 UTC20m
2026-07-02 CSN355 - Jul 2, 03:35 UTCJul 2, 04:05 UTC30m
2026-07-01 CSN6914 - Jul 1, 00:15 UTCJul 1, 00:35 UTC20m
2026-06-30 CSN5068 FRU → PKX Jun 30, 21:50 UTCJun 30, 22:00 UTC10m
2026-06-30 CSN5067 - Jun 30, 10:35 UTCJun 30, 11:00 UTC25m
2026-06-28 CSN318 - Jun 28, 04:35 UTCJun 28, 04:55 UTC20m
2026-06-28 CSN317 - Jun 28, 02:25 UTCJun 28, 02:49 UTC25m
2026-06-27 CSN5068 FRU → PKX Jun 27, 21:50 UTCJun 27, 22:09 UTC20m
2026-06-27 CSN5067 - Jun 27, 10:40 UTCJun 27, 10:54 UTC15m
2026-06-23 CSN5098 ALA → PKX Jun 23, 21:29 UTCJun 23, 21:45 UTC15m
2026-06-23 CSN5097 - Jun 23, 10:44 UTCJun 23, 11:14 UTC30m
2026-06-21 CSN318 - Jun 21, 04:34 UTCJun 21, 05:00 UTC25m
2026-06-21 CSN317 - Jun 21, 02:20 UTCJun 21, 02:50 UTC30m
2026-06-20 CSN5067 - Jun 20, 10:34 UTCJun 20, 21:44 UTC11h 10m
2026-06-20 CSN8930 - Jun 20, 04:49 UTCJun 20, 04:59 UTC10m
2026-06-12 CSN318 GMP → PKX Jun 12, 05:25 UTCJun 12, 05:50 UTC25m
2026-06-12 CSN317 - Jun 12, 02:25 UTCJun 12, 02:50 UTC25m
2026-06-11 CSN5098 ALA → PKX Jun 11, 21:55 UTCJun 11, 22:10 UTC15m
2026-06-11 CSN5097 PKX → ALA Jun 11, 10:50 UTCJun 11, 11:10 UTC20m
2026-06-11 CSN356 HKG → PKX Jun 11, 05:55 UTCJun 11, 06:15 UTC20m

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-323S page for operator, model, and routing details .

Mode-S 781B8D frequently asked

What is Mode-S code 781B8D?
781B8D is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-323S.
Where is Mode-S 781B8D registered?
Mode-S code 781B8D is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781B8D broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781B8D, octal 36015615, decimal 7,871,373.
What flights does 781B8D operate?
Mode-S 781B8D has broadcast 20 distinct callsigns, including CSN317, CSN318, CSN356, CSN355, CSN5067.