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 Jul 25, 22:35 UTC
Flights observed
182
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 22:35 UTC

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 20 distinct

Callsign Airline Flights Last seen
CSN674 - 26 2026-07-13
CSN673 - 21 2026-07-12
CSN346 - 21 2026-07-12
CSN302 - 17 2026-07-21
CSN306 China Southern Airlines 16 2026-06-20
CSN345 - 14 2026-07-11
CSN301 China Southern Airlines 13 2026-07-21
CSN305 - 8 2026-06-19
CSN656 China Southern Airlines 6 2026-07-25
CSN322 China Southern Airlines 6 2026-07-19
CSN655 China Southern Airlines 4 2026-07-25
CSN350 - 4 2026-06-21
CSN349 - 3 2026-06-21
CSN321 China Southern Airlines 3 2026-07-18
CSN316 - 3 2026-07-10
CSN315 - 3 2026-07-09
CSN6909 China Southern Airlines 2 2026-06-26
CSN6902 - 2 2026-06-26
CSN382 - 2 2026-07-16
CSN348 China Southern Airlines 2 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CSN656 SVO → CAN Jul 25, 18:50 UTCJul 25, 22:35 UTC3h 45m
2026-07-25 CSN655 CAN → SVO Jul 25, 14:50 UTCJul 25, 15:20 UTC30m
2026-07-24 CSN656 SVO → CAN Jul 24, 19:55 UTCJul 25, 14:15 UTC18h 20m
2026-07-24 CSN656 SVO → CAN Jul 24, 19:05 UTCJul 25, 14:15 UTC19h 10m
2026-07-24 CSN655 CAN → SVO Jul 24, 15:00 UTCJul 24, 15:30 UTC30m
2026-07-23 CSN656 SVO → CAN Jul 23, 19:50 UTCJul 24, 14:15 UTC18h 25m
2026-07-23 CSN656 SVO → CAN Jul 23, 19:40 UTCJul 24, 14:15 UTC18h 35m
2026-07-22 CSN655 CAN → SVO Jul 22, 19:50 UTCJul 23, 15:30 UTC19h 40m
2026-07-22 CSN656 SVO → CAN Jul 22, 18:25 UTCJul 23, 15:30 UTC21h 5m
2026-07-22 CSN655 CAN → SVO Jul 22, 11:35 UTCJul 22, 15:45 UTC4h 10m
2026-07-21 CSN302 - Jul 21, 20:20 UTCJul 21, 20:35 UTC15m
2026-07-21 CSN302 - Jul 21, 11:50 UTCJul 21, 19:30 UTC7h 40m
2026-07-21 CSN301 CAN → SYD Jul 21, 00:45 UTCJul 21, 09:10 UTC8h 25m
2026-07-20 CSN302 - Jul 20, 20:10 UTCJul 20, 20:50 UTC40m
2026-07-20 CSN302 - Jul 20, 11:50 UTCJul 20, 19:25 UTC7h 35m
2026-07-20 CSN301 CAN → SYD Jul 20, 00:35 UTCJul 20, 09:10 UTC8h 35m
2026-07-19 CSN322 MEL → CAN Jul 19, 09:10 UTCJul 19, 09:25 UTC15m
2026-07-19 CSN322 MEL → CAN Jul 19, 00:50 UTCJul 19, 08:20 UTC7h 30m
2026-07-18 CSN321 CAN → MEL Jul 18, 14:40 UTCJul 18, 23:05 UTC8h 25m
2026-07-18 CSN322 MEL → CAN Jul 18, 08:50 UTCJul 18, 09:05 UTC15m
2026-07-18 CSN322 MEL → CAN Jul 18, 00:29 UTCJul 18, 08:00 UTC7h 31m
2026-07-17 CSN321 CAN → MEL Jul 17, 13:55 UTCJul 17, 22:25 UTC8h 30m
2026-07-17 CSN322 - Jul 17, 08:45 UTCJul 17, 09:04 UTC20m
2026-07-17 CSN322 - Jul 17, 00:50 UTCJul 17, 07:55 UTC7h 5m
2026-07-16 CSN321 CAN → MEL Jul 16, 13:49 UTCJul 16, 22:49 UTC9h 0m
2026-07-16 CSN382 - Jul 16, 08:25 UTCJul 16, 08:45 UTC20m
2026-07-16 CSN382 - Jul 16, 00:35 UTCJul 16, 07:20 UTC6h 45m
2026-07-15 CSN381 - Jul 15, 14:25 UTCJul 15, 22:00 UTC7h 35m
2026-07-14 CSN3193 - Jul 14, 05:05 UTCJul 14, 05:20 UTC15m
2026-07-13 CSN674 - Jul 13, 05:25 UTCJul 13, 05:35 UTC10m
2026-07-12 CSN674 - Jul 12, 20:25 UTCJul 13, 02:55 UTC6h 30m
2026-07-12 CSN673 - Jul 12, 10:40 UTCJul 12, 17:30 UTC6h 50m
2026-07-12 CSN673 - Jul 12, 07:35 UTCJul 12, 07:45 UTC10m
2026-07-12 CSN346 - Jul 12, 05:01 UTCJul 12, 05:10 UTC10m
2026-07-11 CSN346 - Jul 11, 20:15 UTCJul 11, 23:45 UTC3h 30m
2026-07-11 CSN345 - Jul 11, 08:01 UTCJul 11, 17:25 UTC9h 25m
2026-07-11 CSN674 - Jul 11, 05:25 UTCJul 11, 05:40 UTC15m
2026-07-10 CSN674 - Jul 10, 20:30 UTCJul 11, 02:50 UTC6h 20m
2026-07-10 CSN673 - Jul 10, 07:05 UTCJul 10, 17:00 UTC9h 55m
2026-07-10 CSN316 - Jul 10, 00:45 UTCJul 10, 01:05 UTC20m
2026-07-09 CSN315 - Jul 9, 12:30 UTCJul 9, 12:50 UTC20m
2026-07-09 CSN316 - Jul 9, 00:40 UTCJul 9, 01:00 UTC20m
2026-07-08 CSN315 - Jul 8, 12:30 UTCJul 8, 12:50 UTC20m
2026-07-02 CSN316 - Jul 2, 00:45 UTCJul 2, 01:10 UTC25m
2026-07-01 CSN315 - Jul 1, 12:25 UTCJul 1, 12:55 UTC30m
2026-06-29 CSN674 LHR → PKX Jun 29, 20:15 UTCJun 30, 05:30 UTC9h 16m
2026-06-29 CSN673 - Jun 29, 07:20 UTCJun 29, 17:30 UTC10h 10m
2026-06-28 CSN674 LHR → PKX Jun 28, 05:15 UTCJun 28, 05:29 UTC15m
2026-06-27 CSN674 LHR → PKX Jun 27, 20:19 UTCJun 28, 02:39 UTC6h 20m
2026-06-27 CSN673 - Jun 27, 06:40 UTCJun 27, 16:44 UTC10h 5m

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 Jul 25, 22:35 UTC.
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 20 distinct callsigns, including CSN674, CSN673, CSN346, CSN302, CSN306.