Apparatus

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sensors Mode-S transponder

781940

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20EM · BOEING 777-200LR

Hex
781940
Octal
36014500
Decimal
7,870,784
Country
CN
Tail
B-20EM
Type
B77L
No current signal · last broadcast 18h ago
Flights observed
104
Distinct callsigns
20
Country
CN
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S 781940.

Country allocation

The ICAO 24-bit address 781940 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
CSN427 China Southern Airlines 14 2026-06-01
CSN5213 China Southern Airlines 7 2026-05-11
CSN435 China Southern Airlines 7 2026-05-30
CSN485 China Southern Airlines 6 2026-04-28
CSN451 China Southern Airlines 6 2026-05-29
CSN428 China Southern Airlines 6 2026-06-01
CSN495 China Southern Airlines 5 2026-05-27
CSN453 China Southern Airlines 5 2026-05-25
CSN5220 China Southern Airlines 4 2026-05-12
CSN5214 China Southern Airlines 4 2026-05-01
CSN467 China Southern Airlines 4 2026-04-15
CSN496 China Southern Airlines 3 2026-05-28
CSN488 China Southern Airlines 3 2026-05-11
CSN487 China Southern Airlines 3 2026-05-10
CSN463 China Southern Airlines 3 2026-05-07
CSN462 - 3 2026-04-15
CSN5222 China Southern Airlines 2 2026-05-03
CSN5221 China Southern Airlines 2 2026-05-02
CSN5217 China Southern Airlines 2 2026-04-22
CSN486 China Southern Airlines 2 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-01 CSN428 ORD → PVG Jun 1, 13:25 UTCJun 2, 01:40 UTC12h 15m
2026-06-01 CSN427 SEA → ORD Jun 1, 05:35 UTCJun 1, 11:05 UTC5h 30m
2026-05-31 CSN427 SEA → ORD May 31, 15:20 UTCJun 1, 04:05 UTC12h 45m
2026-05-31 CSN427 SEA → ORD May 31, 08:40 UTCJun 1, 04:05 UTC19h 25m
2026-05-30 CSN435 ANC → ORD May 30, 18:10 UTCMay 30, 23:50 UTC5h 40m
2026-05-29 CSN435 ANC → ORD May 29, 22:35 UTCMay 30, 16:35 UTC18h 0m
2026-05-29 CSN435 ANC → ORD May 29, 20:20 UTCMay 30, 16:35 UTC20h 15m
2026-05-29 CSN435 ANC → ORD May 29, 18:05 UTCMay 30, 16:35 UTC22h 30m
2026-05-29 CSN452 AMS → PVG May 29, 16:55 UTCMay 30, 16:00 UTC23h 5m
2026-05-29 CSN451 SZX → AMS May 29, 04:05 UTCMay 29, 13:40 UTC9h 35m
2026-05-28 CSN451 SZX → AMS May 28, 16:05 UTCMay 29, 13:40 UTC21h 35m
2026-05-28 CSN451 SZX → AMS May 28, 12:05 UTCMay 29, 12:00 UTC23h 55m
2026-05-28 CSN496 AMS → CKG May 28, 10:30 UTCMay 29, 10:00 UTC23h 30m
2026-05-27 CSN495 PVG → AMS May 27, 21:20 UTCMay 28, 06:35 UTC9h 15m
2026-05-26 CSN454 AMS → AMS May 26, 11:34 UTCMay 26, 17:25 UTC5h 50m
2026-05-25 CSN453 PVG → AMS May 25, 22:30 UTCMay 26, 07:59 UTC9h 30m
2026-05-12 CSN5220 LAX → CAN May 12, 12:20 UTCMay 12, 17:30 UTC5h 10m
2026-05-11 CSN5213 PVG → MEX May 11, 14:10 UTCMay 12, 08:05 UTC17h 56m
2026-05-11 CSN488 YYZ → PVG May 11, 04:40 UTCMay 11, 22:35 UTC17h 55m
2026-05-11 CSN488 YYZ → PVG May 11, 02:05 UTCMay 11, 22:35 UTC20h 30m
2026-05-11 CSN488 YYZ → PVG May 11, 01:55 UTCMay 11, 22:35 UTC20h 40m
2026-05-10 CSN487 YVR → YYZ May 10, 17:05 UTCMay 10, 22:25 UTC5h 20m
2026-05-09 CSN487 YVR → YYZ May 9, 20:15 UTCMay 10, 15:35 UTC19h 20m
2026-05-09 CSN487 YVR → YYZ May 9, 18:50 UTCMay 10, 15:35 UTC20h 45m
2026-05-09 CSN464 FRA → PVG May 9, 14:05 UTCMay 10, 14:00 UTC23h 55m
2026-05-09 CSN464 FRA → PVG May 9, 13:30 UTCMay 10, 09:45 UTC20h 15m
2026-05-09 CSN469 CAN → FRA May 9, 02:35 UTCMay 9, 09:25 UTC6h 50m
2026-05-08 CSN470 FRA → CAN May 8, 03:19 UTCMay 8, 03:35 UTC15m
2026-05-07 CSN470 FRA → CAN May 7, 14:10 UTCMay 7, 19:45 UTC5h 35m
2026-05-07 CSN463 PVG → FRA May 7, 00:30 UTCMay 7, 10:45 UTC10h 15m
2026-05-06 CSN463 PVG → FRA May 6, 11:25 UTCMay 7, 10:00 UTC22h 35m
2026-05-06 CSN463 PVG → FRA May 6, 05:00 UTCMay 7, 04:00 UTC22h 59m
2026-05-05 CSN436 AMS → PVG May 5, 22:55 UTCMay 6, 11:55 UTC13h 0m
2026-05-05 CSN435 ANC → ORD May 5, 14:55 UTCMay 5, 20:10 UTC5h 15m
2026-05-04 CSN435 ANC → ORD May 4, 23:50 UTCMay 5, 13:40 UTC13h 50m
2026-05-04 CSN435 ANC → ORD May 4, 17:30 UTCMay 5, 13:40 UTC20h 11m
2026-05-04 CSN428 ORD → PVG May 4, 12:05 UTCMay 5, 12:00 UTC23h 56m
2026-05-04 CSN428 ORD → PVG May 4, 11:25 UTCMay 5, 08:00 UTC20h 36m
2026-05-04 CSN427 SEA → ORD May 4, 02:50 UTCMay 4, 07:45 UTC4h 55m
2026-05-03 CSN427 SEA → ORD May 3, 11:25 UTCMay 4, 01:44 UTC14h 20m
2026-05-03 CSN427 SEA → ORD May 3, 04:05 UTCMay 4, 01:44 UTC21h 40m
2026-05-03 CSN427 SEA → ORD May 3, 02:55 UTCMay 4, 01:44 UTC22h 49m
2026-05-03 CSN5222 LAX → SZX May 3, 00:05 UTCMay 3, 20:00 UTC19h 54m
2026-05-02 CSN5222 LAX → SZX May 2, 22:55 UTCMay 3, 20:00 UTC21h 4m
2026-05-02 CSN5221 SZX → LAX May 2, 05:25 UTCMay 2, 20:45 UTC15h 20m
2026-05-01 CSN5221 SZX → LAX May 1, 22:25 UTCMay 2, 20:45 UTC22h 20m
2026-05-01 CSN5214 YYZ → PVG May 1, 20:50 UTCMay 2, 20:00 UTC23h 10m
2026-05-01 CSN5214 YYZ → PVG May 1, 16:40 UTCMay 2, 11:40 UTC19h 1m
2026-05-01 CSN5213 PVG → MEX May 1, 03:45 UTCMay 1, 13:55 UTC10h 10m
2026-04-30 CSN5213 PVG → MEX Apr 30, 16:05 UTCMay 1, 13:55 UTC21h 50m

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-20EM page for operator, model, and routing details .

Mode-S 781940 frequently asked

What is Mode-S code 781940?
781940 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20EM.
Where is Mode-S 781940 registered?
Mode-S code 781940 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781940 broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781940, octal 36014500, decimal 7,870,784.
What flights does 781940 operate?
Mode-S 781940 has broadcast 20 distinct callsigns, including CSN427, CSN5213, CSN435, CSN485, CSN451.