Apparatus

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sensors Mode-S transponder

781B6F

ICAO 24-bit transponder address · allocated to China

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

Hex
781B6F
Octal
36015557
Decimal
7,871,343
Country
CN
Tail
B-323F
Type
A21N
No current signal · last broadcast 12h ago
Flights observed
114
Distinct callsigns
20
Country
CN
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 781B6F.

Country allocation

The ICAO 24-bit address 781B6F 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
CSN355 - 14 2026-07-15
CSN318 - 12 2026-07-14
CSN317 - 12 2026-07-14
CSN356 - 11 2026-07-15
CSN5097 - 8 2026-07-16
CSN5098 - 7 2026-07-16
CSN6028 China Southern Airlines 6 2026-06-25
CSN5068 China Southern Airlines 6 2026-06-23
CSN5067 - 5 2026-06-23
CSN6027 China Southern Airlines 3 2026-06-11
CSN8996 China Southern Airlines 2 2026-07-19
CSN8995 China Southern Airlines 2 2026-07-18
CSN8930 - 2 2026-07-03
CSN8471 - 2 2026-07-15
CSN5004 China Southern Airlines 2 2026-05-07
CSN5003 China Southern Airlines 2 2026-05-06
CSN3915 - 2 2026-07-05
CSN3193 China Southern Airlines 2 2026-05-09
CSN8991 China Southern Airlines 1 2026-04-19
CSN8909 China Southern Airlines 1 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-19 CSN8996 AAT → PKX Jul 19, 07:25 UTCJul 19, 07:35 UTC10m
2026-07-18 CSN8995 PKX → AAT Jul 18, 23:15 UTCJul 18, 23:40 UTC25m
2026-07-18 CSN8844 - Jul 18, 11:55 UTCJul 18, 12:05 UTC10m
2026-07-16 CSN5098 - Jul 16, 21:35 UTCJul 16, 21:50 UTC15m
2026-07-16 CSN5097 - Jul 16, 10:55 UTCJul 16, 11:15 UTC20m
2026-07-16 CSN8996 - Jul 16, 07:20 UTCJul 16, 07:35 UTC15m
2026-07-15 CSN8995 - Jul 15, 23:15 UTCJul 15, 23:40 UTC25m
2026-07-15 CSN8471 - Jul 15, 11:40 UTCJul 15, 12:00 UTC20m
2026-07-15 CSN356 - Jul 15, 07:00 UTCJul 15, 07:15 UTC15m
2026-07-15 CSN355 - Jul 15, 03:35 UTCJul 15, 04:10 UTC35m
2026-07-14 CSN318 - Jul 14, 04:50 UTCJul 14, 05:15 UTC25m
2026-07-14 CSN317 - Jul 14, 02:30 UTCJul 14, 02:55 UTC25m
2026-07-10 CSN5438 - Jul 10, 11:30 UTCJul 10, 11:40 UTC10m
2026-07-10 CSN5437 - Jul 10, 02:15 UTCJul 10, 02:35 UTC20m
2026-07-09 CSN8471 - Jul 9, 11:20 UTCJul 9, 11:40 UTC20m
2026-07-08 CSN3157 - Jul 8, 08:50 UTCJul 8, 09:00 UTC10m
2026-07-08 CSN3168 - Jul 8, 06:15 UTCJul 8, 06:40 UTC25m
2026-07-07 CSN318 - Jul 7, 05:05 UTCJul 7, 05:30 UTC25m
2026-07-07 CSN317 - Jul 7, 02:20 UTCJul 7, 02:50 UTC30m
2026-07-06 CSN5098 ALA → PKX Jul 6, 21:30 UTCJul 6, 21:40 UTC10m
2026-07-06 CSN5097 - Jul 6, 10:50 UTCJul 6, 11:15 UTC25m
2026-07-06 CSN356 - Jul 6, 06:00 UTCJul 6, 06:25 UTC25m
2026-07-06 CSN355 - Jul 6, 03:30 UTCJul 6, 04:20 UTC50m
2026-07-05 CSN3915 - Jul 5, 09:10 UTCJul 5, 09:20 UTC10m
2026-07-04 CSN8871 - Jul 4, 11:10 UTCJul 4, 11:20 UTC10m
2026-07-03 CSN8930 - Jul 3, 04:55 UTCJul 3, 05:10 UTC15m
2026-07-02 CSN5097 - Jul 2, 10:55 UTCJul 2, 22:00 UTC11h 5m
2026-06-29 CSN5098 ALA → PKX Jun 29, 21:30 UTCJun 29, 21:44 UTC15m
2026-06-29 CSN5097 - Jun 29, 10:55 UTCJun 29, 11:14 UTC20m
2026-06-29 CSN356 - Jun 29, 06:09 UTCJun 29, 06:29 UTC20m
2026-06-29 CSN355 - Jun 29, 03:25 UTCJun 29, 04:04 UTC40m
2026-06-27 CSN5098 ALA → PKX Jun 27, 21:25 UTCJun 27, 21:40 UTC15m
2026-06-27 CSN356 - Jun 27, 06:40 UTCJun 27, 06:59 UTC20m
2026-06-27 CSN355 - Jun 27, 03:09 UTCJun 27, 03:49 UTC40m
2026-06-25 CSN6028 TAS → PKX Jun 25, 21:50 UTCJun 25, 22:04 UTC15m
2026-06-23 CSN5068 FRU → PKX Jun 23, 21:49 UTCJun 23, 21:59 UTC10m
2026-06-23 CSN5067 - Jun 23, 10:29 UTCJun 23, 10:49 UTC20m
2026-06-23 CSN356 - Jun 23, 05:54 UTCJun 23, 06:15 UTC20m
2026-06-23 CSN355 - Jun 23, 03:29 UTCJun 23, 04:05 UTC35m
2026-06-21 CSN8930 - Jun 21, 04:39 UTCJun 21, 04:54 UTC15m
2026-06-19 CSN356 - Jun 19, 07:59 UTCJun 19, 08:20 UTC20m
2026-06-19 CSN355 - Jun 19, 04:19 UTCJun 19, 05:00 UTC40m
2026-06-18 CSN355 HKG → HKG Jun 18, 06:55 UTCJun 19, 05:00 UTC22h 4m
2026-06-18 CSN355 - Jun 18, 04:10 UTCJun 18, 04:35 UTC25m
2026-06-18 CSN355 - Jun 18, 03:20 UTCJun 18, 03:40 UTC20m
2026-06-17 CSN356 - Jun 17, 06:55 UTCJun 17, 07:10 UTC15m
2026-06-17 CSN355 - Jun 17, 03:20 UTCJun 17, 03:50 UTC30m
2026-06-16 CSN318 - Jun 16, 04:50 UTCJun 16, 05:10 UTC20m
2026-06-16 CSN317 - Jun 16, 02:29 UTCJun 16, 02:54 UTC25m
2026-06-11 CSN6028 TAS → PKX Jun 11, 22:00 UTCJun 11, 22:15 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-323F page for operator, model, and routing details .

Mode-S 781B6F frequently asked

What is Mode-S code 781B6F?
781B6F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-323F.
Where is Mode-S 781B6F registered?
Mode-S code 781B6F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781B6F 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 781B6F, octal 36015557, decimal 7,871,343.
What flights does 781B6F operate?
Mode-S 781B6F has broadcast 20 distinct callsigns, including CSN355, CSN318, CSN317, CSN356, CSN5097.