Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 26, 15:25 UTC
Flights observed
134
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 15:25 UTC

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 China Southern Airlines 16 2026-07-26
CSN356 China Southern Airlines 13 2026-07-26
CSN318 China Southern Airlines 13 2026-07-24
CSN317 China Southern Airlines 13 2026-07-24
CSN5097 China Southern Airlines 10 2026-07-25
CSN5098 China Southern Airlines 9 2026-07-25
CSN6028 China Southern Airlines 6 2026-06-25
CSN5068 China Southern Airlines 6 2026-06-23
CSN5067 - 5 2026-06-23
CSN8996 China Southern Airlines 3 2026-07-20
CSN8995 China Southern Airlines 3 2026-07-19
CSN8471 China Southern Airlines 3 2026-07-26
CSN6027 China Southern Airlines 3 2026-06-11
CSN8930 - 2 2026-07-03
CSN8010 - 2 2026-07-20
CSN8009 - 2 2026-07-20
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN8472 HLD → PKX Jul 26, 15:15 UTCJul 26, 15:25 UTC10m
2026-07-26 CSN8471 PKX → HLD Jul 26, 11:00 UTCJul 26, 11:20 UTC20m
2026-07-26 CSN356 HKG → PKX Jul 26, 05:50 UTCJul 26, 06:10 UTC20m
2026-07-26 CSN355 PKX → HKG Jul 26, 03:30 UTCJul 26, 04:10 UTC40m
2026-07-25 CSN5098 ALA → PKX Jul 25, 22:05 UTCJul 25, 22:15 UTC10m
2026-07-25 CSN5097 PKX → ALA Jul 25, 11:00 UTCJul 25, 11:25 UTC25m
2026-07-25 CSN356 HKG → PKX Jul 25, 06:25 UTCJul 25, 06:45 UTC20m
2026-07-25 CSN355 PKX → HKG Jul 25, 01:15 UTCJul 25, 04:15 UTC3h 0m
2026-07-24 CSN6135 PKX → CTU Jul 24, 09:25 UTCJul 24, 16:05 UTC6h 40m
2026-07-24 CSN318 GMP → PKX Jul 24, 06:00 UTCJul 24, 06:30 UTC30m
2026-07-24 CSN317 PKX → GMP Jul 24, 02:35 UTCJul 24, 02:55 UTC20m
2026-07-23 CSN5098 ALA → PKX Jul 23, 21:35 UTCJul 23, 21:45 UTC10m
2026-07-23 CSN5097 PKX → ALA Jul 23, 10:50 UTCJul 23, 11:10 UTC20m
2026-07-21 CSN6714 PKX → SYX Jul 21, 09:55 UTCJul 21, 10:05 UTC10m
2026-07-21 CSN6143 CGQ → PKX Jul 21, 03:50 UTCJul 21, 04:00 UTC10m
2026-07-21 CSN6144 PKX → CGQ Jul 21, 00:05 UTCJul 21, 00:15 UTC10m
2026-07-20 CSN8010 - Jul 20, 17:25 UTCJul 20, 18:35 UTC1h 10m
2026-07-20 CSN8009 - Jul 20, 14:50 UTCJul 20, 16:05 UTC1h 15m
2026-07-20 CSN8996 AAT → PKX Jul 20, 07:15 UTCJul 20, 07:35 UTC20m
2026-07-19 CSN8995 PKX → AAT Jul 19, 23:20 UTCJul 19, 23:35 UTC15m
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

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 Jul 26, 15:25 UTC.
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, CSN356, CSN318, CSN317, CSN5097.