Apparatus

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sensors Mode-S transponder

781E1F

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32AV · AIRBUS A-350-900

Hex
781E1F
Octal
36017037
Decimal
7,872,031
Country
CN
Tail
B-32AV
Type
A359
No current signal · last broadcast 6h ago
Flights observed
83
Distinct callsigns
11
Country
CN
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 781E1F.

Country allocation

The ICAO 24-bit address 781E1F 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 11 distinct

Callsign Airline Flights Last seen
CSN674 China Southern Airlines 15 2026-05-30
CSN346 China Southern Airlines 14 2026-05-28
CSN673 China Southern Airlines 13 2026-05-29
CSN306 China Southern Airlines 11 2026-05-06
CSN345 China Southern Airlines 9 2026-05-27
CSN305 China Southern Airlines 6 2026-05-05
CSN302 China Southern Airlines 6 2026-05-07
CSN301 China Southern Airlines 5 2026-05-07
CSN350 China Southern Airlines 2 2026-04-24
CSN349 China Southern Airlines 1 2026-04-24
CSN3000 China Southern Airlines 1 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CSN674 LHR → PKX May 30, 05:45 UTCMay 30, 05:55 UTC10m
2026-05-29 CSN674 LHR → PKX May 29, 20:50 UTCMay 30, 03:20 UTC6h 30m
2026-05-29 CSN673 PKX → LHR May 29, 09:50 UTCMay 29, 10:30 UTC40m
2026-05-29 CSN673 PKX → LHR May 29, 06:35 UTCMay 29, 06:50 UTC15m
2026-05-28 CSN346 AMS → PKX May 28, 04:30 UTCMay 28, 04:45 UTC15m
2026-05-27 CSN346 AMS → PKX May 27, 19:55 UTCMay 28, 02:00 UTC6h 5m
2026-05-27 CSN345 PEK → AMS May 27, 06:40 UTCMay 27, 16:10 UTC9h 31m
2026-05-26 CSN346 AMS → PKX May 26, 04:30 UTCMay 26, 04:39 UTC10m
2026-05-25 CSN346 AMS → PKX May 25, 20:09 UTCMay 26, 02:00 UTC5h 50m
2026-05-25 CSN345 PEK → AMS May 25, 09:55 UTCMay 25, 16:30 UTC6h 35m
2026-05-23 CSN674 LHR → PKX May 23, 20:20 UTCMay 24, 02:30 UTC6h 10m
2026-05-23 CSN673 PKX → LHR May 23, 09:50 UTCMay 23, 16:55 UTC7h 5m
2026-05-22 CSN3000 PEK → CAN May 22, 02:05 UTCMay 22, 02:20 UTC15m
2026-05-21 CSN346 AMS → PKX May 21, 04:30 UTCMay 21, 04:45 UTC15m
2026-05-20 CSN346 AMS → PKX May 20, 19:55 UTCMay 21, 01:55 UTC6h 0m
2026-05-20 CSN345 PEK → AMS May 20, 09:45 UTCMay 20, 16:25 UTC6h 40m
2026-05-20 CSN345 PEK → AMS May 20, 06:35 UTCMay 20, 06:45 UTC10m
2026-05-19 CSN674 LHR → PKX May 19, 05:20 UTCMay 19, 05:30 UTC10m
2026-05-18 CSN674 LHR → PKX May 18, 20:25 UTCMay 19, 02:45 UTC6h 20m
2026-05-18 CSN673 PKX → LHR May 18, 09:45 UTCMay 18, 16:40 UTC6h 55m
2026-05-18 CSN673 PKX → LHR May 18, 06:40 UTCMay 18, 06:50 UTC10m
2026-05-15 CSN346 AMS → PKX May 15, 20:10 UTCMay 16, 02:10 UTC6h 0m
2026-05-15 CSN345 PEK → AMS May 15, 09:40 UTCMay 15, 16:00 UTC6h 19m
2026-05-13 CSN346 AMS → PKX May 13, 20:00 UTCMay 14, 02:00 UTC6h 0m
2026-05-13 CSN345 PEK → AMS May 13, 08:25 UTCMay 13, 16:20 UTC7h 55m
2026-05-11 CSN674 LHR → PKX May 11, 20:15 UTCMay 11, 22:35 UTC2h 19m
2026-05-11 CSN673 PKX → LHR May 11, 08:40 UTCMay 11, 17:05 UTC8h 26m
2026-05-09 CSN674 LHR → PKX May 9, 20:20 UTCMay 10, 02:34 UTC6h 15m
2026-05-09 CSN673 PKX → LHR May 9, 06:40 UTCMay 9, 16:50 UTC10h 10m
2026-05-07 CSN302 SYD → CAN May 7, 20:40 UTCMay 7, 21:10 UTC30m
2026-05-07 CSN302 SYD → CAN May 7, 11:55 UTCMay 7, 19:50 UTC7h 55m
2026-05-07 CSN301 CAN → SYD May 7, 00:35 UTCMay 7, 08:55 UTC8h 20m
2026-05-06 CSN306 AKL → CAN May 6, 20:30 UTCMay 6, 20:55 UTC25m
2026-05-06 CSN306 AKL → CAN May 6, 09:40 UTCMay 6, 19:45 UTC10h 4m
2026-05-05 CSN305 CAN → AKL May 5, 17:20 UTCMay 6, 03:20 UTC10h 0m
2026-05-04 CSN674 LHR → PKX May 4, 04:55 UTCMay 4, 05:05 UTC10m
2026-05-03 CSN674 LHR → PKX May 3, 20:20 UTCMay 4, 02:25 UTC6h 5m
2026-05-03 CSN673 PKX → LHR May 3, 06:45 UTCMay 3, 17:24 UTC10h 40m
2026-05-02 CSN346 AMS → PKX May 2, 04:55 UTCMay 2, 05:05 UTC10m
2026-05-01 CSN346 AMS → PKX May 1, 20:05 UTCMay 2, 02:10 UTC6h 5m
2026-05-01 CSN345 PEK → AMS May 1, 08:35 UTCMay 1, 16:15 UTC7h 40m
2026-05-01 CSN345 PEK → AMS May 1, 06:40 UTCMay 1, 06:50 UTC10m
2026-04-28 CSN674 LHR → PKX Apr 28, 05:10 UTCApr 28, 05:25 UTC15m
2026-04-27 CSN674 LHR → PKX Apr 27, 20:20 UTCApr 28, 02:40 UTC6h 20m
2026-04-27 CSN673 PKX → LHR Apr 27, 07:00 UTCApr 27, 17:10 UTC10h 10m
2026-04-26 CSN346 AMS → PKX Apr 26, 04:25 UTCApr 26, 04:40 UTC15m
2026-04-25 CSN346 AMS → PKX Apr 25, 20:10 UTCApr 26, 02:00 UTC5h 50m
2026-04-25 CSN345 PEK → AMS Apr 25, 06:35 UTCApr 25, 16:30 UTC9h 55m
2026-04-24 CSN350 KUL → CAN Apr 24, 09:05 UTCApr 24, 09:35 UTC30m
2026-04-24 CSN350 KUL → CAN Apr 24, 06:10 UTCApr 24, 07:30 UTC1h 20m

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-32AV page for operator, model, and routing details .

Mode-S 781E1F frequently asked

What is Mode-S code 781E1F?
781E1F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32AV.
Where is Mode-S 781E1F registered?
Mode-S code 781E1F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E1F broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E1F, octal 36017037, decimal 7,872,031.
What flights does 781E1F operate?
Mode-S 781E1F has broadcast 11 distinct callsigns, including CSN674, CSN346, CSN673, CSN306, CSN345.