Apparatus

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sensors Mode-S transponder

781E81

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32CS · AIRBUS A-321neo

Hex
781E81
Octal
36017201
Decimal
7,872,129
Country
CN
Tail
B-32CS
Type
A21N
No current signal · last broadcast 7h ago
Flights observed
119
Distinct callsigns
20
Country
CN
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 781E81.

Country allocation

The ICAO 24-bit address 781E81 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
CSN5097 - 15 2026-07-15
CSN5098 - 14 2026-07-15
CSN317 - 14 2026-07-12
CSN318 - 12 2026-07-12
CSN355 - 9 2026-07-03
CSN356 - 8 2026-07-03
CSN5067 - 6 2026-07-08
CSN3193 - 6 2026-06-19
CSN5068 China Southern Airlines 5 2026-07-08
CSN3194 - 4 2026-06-19
CSN8010 China Southern Airlines 3 2026-06-17
CSN8009 China Southern Airlines 3 2026-06-17
CSN8995 - 2 2026-07-08
CSN8541 - 2 2026-06-30
CSN6909 - 2 2026-07-13
CSN6159 China Southern Airlines 2 2026-06-27
CSN8996 China Southern Airlines 1 2026-06-26
CSN8974 - 1 2026-06-18
CSN8930 - 1 2026-07-13
CSN6914 China Southern Airlines 1 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 CSN6914 PKX → URC Jul 18, 00:19 UTCJul 18, 00:39 UTC20m
2026-07-15 CSN5098 - Jul 15, 21:30 UTCJul 15, 21:45 UTC15m
2026-07-15 CSN5097 - Jul 15, 11:00 UTCJul 15, 11:20 UTC20m
2026-07-13 CSN6909 - Jul 13, 15:25 UTCJul 13, 15:35 UTC10m
2026-07-13 CSN6902 - Jul 13, 07:20 UTCJul 13, 07:40 UTC20m
2026-07-13 CSN8930 - Jul 13, 05:05 UTCJul 13, 05:15 UTC10m
2026-07-12 CSN318 - Jul 12, 04:45 UTCJul 12, 05:10 UTC25m
2026-07-12 CSN317 - Jul 12, 02:50 UTCJul 12, 03:10 UTC20m
2026-07-11 CSN5098 - Jul 11, 23:00 UTCJul 11, 23:15 UTC15m
2026-07-11 CSN5097 - Jul 11, 12:50 UTCJul 11, 13:10 UTC20m
2026-07-10 CSN5903 - Jul 10, 13:45 UTCJul 10, 13:55 UTC10m
2026-07-08 CSN8995 - Jul 8, 23:20 UTCJul 9, 07:25 UTC8h 5m
2026-07-08 CSN5068 FRU → PKX Jul 8, 16:05 UTCJul 8, 16:15 UTC10m
2026-07-08 CSN5067 - Jul 8, 05:15 UTCJul 8, 05:30 UTC15m
2026-07-05 CSN5098 ALA → PKX Jul 5, 21:30 UTCJul 5, 21:40 UTC10m
2026-07-04 CSN318 - Jul 4, 04:50 UTCJul 4, 05:10 UTC20m
2026-07-04 CSN317 - Jul 4, 03:00 UTCJul 4, 03:20 UTC20m
2026-07-03 CSN5098 ALA → PKX Jul 3, 21:40 UTCJul 3, 21:55 UTC15m
2026-07-03 CSN5097 - Jul 3, 11:50 UTCJul 3, 12:05 UTC15m
2026-07-03 CSN356 - Jul 3, 07:15 UTCJul 3, 07:35 UTC20m
2026-07-03 CSN355 - Jul 3, 03:40 UTCJul 3, 04:20 UTC40m
2026-07-01 CSN5098 ALA → PKX Jul 1, 21:45 UTCJul 1, 22:00 UTC15m
2026-07-01 CSN5097 - Jul 1, 10:55 UTCJul 1, 11:05 UTC10m
2026-06-30 CSN8541 - Jun 30, 13:45 UTCJun 30, 14:00 UTC15m
2026-06-27 CSN6159 PKX → KMG Jun 27, 08:55 UTCJun 27, 09:15 UTC20m
2026-06-26 CSN8996 AAT → PKX Jun 26, 07:30 UTCJun 26, 07:45 UTC15m
2026-06-25 CSN8995 PKX → AAT Jun 25, 23:14 UTCJun 25, 23:34 UTC20m
2026-06-25 CSN6365 HAK → PKX Jun 25, 03:10 UTCJun 25, 06:05 UTC2h 55m
2026-06-24 CSN5098 ALA → PKX Jun 24, 21:34 UTCJun 24, 21:50 UTC15m
2026-06-24 CSN5097 - Jun 24, 10:59 UTCJun 24, 11:24 UTC25m
2026-06-24 CSN356 - Jun 24, 05:44 UTCJun 24, 06:10 UTC25m
2026-06-24 CSN355 - Jun 24, 03:24 UTCJun 24, 03:55 UTC30m
2026-06-20 CSN318 - Jun 20, 04:39 UTCJun 20, 04:59 UTC20m
2026-06-20 CSN317 - Jun 20, 02:40 UTCJun 20, 03:04 UTC25m
2026-06-19 CSN5098 ALA → PKX Jun 19, 21:54 UTCJun 19, 22:09 UTC15m
2026-06-19 CSN5097 - Jun 19, 12:04 UTCJun 19, 12:25 UTC20m
2026-06-19 CSN3193 - Jun 19, 06:44 UTCJun 19, 06:54 UTC10m
2026-06-19 CSN3194 - Jun 19, 05:05 UTCJun 19, 05:14 UTC10m
2026-06-18 CSN8974 - Jun 18, 11:40 UTCJun 18, 11:55 UTC15m
2026-06-18 CSN318 - Jun 18, 04:45 UTCJun 18, 05:05 UTC20m
2026-06-18 CSN317 - Jun 18, 02:35 UTCJun 18, 02:55 UTC20m
2026-06-17 CSN8010 DAC → PKX Jun 17, 15:50 UTCJun 17, 16:45 UTC55m
2026-06-17 CSN8009 PKX → DAC Jun 17, 13:10 UTCJun 17, 13:55 UTC45m
2026-06-17 CSN3193 - Jun 17, 04:40 UTCJun 17, 04:55 UTC15m
2026-06-17 CSN3194 - Jun 17, 02:50 UTCJun 17, 03:00 UTC10m
2026-06-14 CSN318 - Jun 14, 04:55 UTCJun 14, 05:15 UTC20m
2026-06-14 CSN317 - Jun 14, 03:15 UTCJun 14, 03:35 UTC20m
2026-06-13 CSN318 - Jun 13, 04:35 UTCJun 13, 05:00 UTC25m
2026-06-13 CSN317 - Jun 13, 02:30 UTCJun 13, 02:50 UTC20m
2026-06-12 CSN5098 ALA → PKX Jun 12, 21:45 UTCJun 12, 22:00 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-32CS page for operator, model, and routing details .

Mode-S 781E81 frequently asked

What is Mode-S code 781E81?
781E81 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32CS.
Where is Mode-S 781E81 registered?
Mode-S code 781E81 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E81 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E81, octal 36017201, decimal 7,872,129.
What flights does 781E81 operate?
Mode-S 781E81 has broadcast 20 distinct callsigns, including CSN5097, CSN5098, CSN317, CSN318, CSN355.