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 15h ago
Flights observed
154
Distinct callsigns
19
Country
CN
Last broadcast
15h 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 19 distinct

Callsign Airline Flights Last seen
CSN674 - 26 2026-07-13
CSN673 - 21 2026-07-12
CSN346 - 21 2026-07-12
CSN306 China Southern Airlines 16 2026-06-20
CSN345 - 14 2026-07-11
CSN302 China Southern Airlines 13 2026-06-15
CSN301 - 11 2026-06-15
CSN305 - 8 2026-06-19
CSN350 - 4 2026-06-21
CSN349 - 3 2026-06-21
CSN316 - 3 2026-07-10
CSN315 - 3 2026-07-09
CSN6909 China Southern Airlines 2 2026-06-26
CSN6902 - 2 2026-06-26
CSN348 China Southern Airlines 2 2026-06-11
CSN347 China Southern Airlines 2 2026-06-10
CSN6901 - 1 2026-06-23
CSN3193 - 1 2026-07-14
CSN3000 China Southern Airlines 1 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-06-26 CSN6909 URC → PKX Jun 26, 16:09 UTCJun 26, 16:20 UTC10m
2026-06-26 CSN6902 - Jun 26, 07:39 UTCJun 26, 07:55 UTC15m
2026-06-25 CSN6909 URC → PKX Jun 25, 15:34 UTCJun 25, 15:44 UTC10m
2026-06-25 CSN346 - Jun 25, 04:40 UTCJun 25, 04:49 UTC10m
2026-06-24 CSN346 - Jun 24, 20:05 UTCJun 25, 02:05 UTC6h 0m
2026-06-24 CSN345 PEK → AMS Jun 24, 06:35 UTCJun 24, 15:54 UTC9h 20m
2026-06-23 CSN6901 - Jun 23, 04:50 UTCJun 23, 05:04 UTC15m
2026-06-22 CSN6902 - Jun 22, 07:19 UTCJun 22, 07:49 UTC30m
2026-06-21 CSN350 - Jun 21, 06:24 UTCJun 21, 09:04 UTC2h 40m
2026-06-21 CSN349 - Jun 21, 04:10 UTCJun 21, 04:44 UTC35m
2026-06-20 CSN306 AKL → CAN Jun 20, 21:05 UTCJun 20, 21:25 UTC20m
2026-06-20 CSN306 AKL → CAN Jun 20, 10:09 UTCJun 20, 20:20 UTC10h 10m
2026-06-19 CSN305 - Jun 19, 17:29 UTCJun 20, 03:19 UTC9h 50m
2026-06-18 CSN674 LHR → PKX Jun 18, 20:30 UTCJun 19, 02:45 UTC6h 14m
2026-06-18 CSN673 - Jun 18, 09:55 UTCJun 18, 16:40 UTC6h 45m
2026-06-16 CSN346 - Jun 16, 20:10 UTCJun 17, 02:15 UTC6h 5m
2026-06-16 CSN345 PEK → AMS Jun 16, 09:55 UTCJun 16, 16:05 UTC6h 10m
2026-06-15 CSN345 PEK → AMS Jun 15, 18:55 UTCJun 16, 16:05 UTC21h 10m
2026-06-15 CSN302 SYD → CAN Jun 15, 11:49 UTCJun 16, 10:35 UTC22h 45m
2026-06-15 CSN301 - Jun 15, 01:04 UTCJun 15, 09:30 UTC8h 25m
2026-06-14 CSN302 SYD → CAN Jun 14, 11:55 UTCJun 14, 19:35 UTC7h 40m
2026-06-14 CSN301 - Jun 14, 00:30 UTCJun 14, 08:45 UTC8h 15m
2026-06-13 CSN302 SYD → CAN Jun 13, 20:10 UTCJun 13, 20:30 UTC20m
2026-06-13 CSN302 SYD → CAN Jun 13, 11:45 UTCJun 13, 19:20 UTC7h 35m
2026-06-13 CSN301 - Jun 13, 00:40 UTCJun 13, 09:15 UTC8h 34m
2026-06-12 CSN302 SYD → CAN Jun 12, 20:10 UTCJun 12, 20:35 UTC25m
2026-06-12 CSN302 SYD → CAN Jun 12, 11:55 UTCJun 12, 19:20 UTC7h 25m
2026-06-12 CSN301 CAN → SYD Jun 12, 01:05 UTCJun 12, 09:45 UTC8h 40m

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 15h 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 19 distinct callsigns, including CSN674, CSN673, CSN346, CSN306, CSN345.