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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 Jul 26, 22:00 UTC
Flights observed
247
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 22:00 UTC

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 - 25 2026-07-20
CSN437 - 21 2026-07-17
CSN485 - 19 2026-07-09
CSN451 China Southern Airlines 18 2026-07-21
CSN428 China Southern Airlines 14 2026-07-21
CSN487 China Southern Airlines 13 2026-07-26
CSN438 - 12 2026-07-18
CSN463 - 11 2026-07-22
CSN452 China Southern Airlines 10 2026-07-22
CSN435 China Southern Airlines 10 2026-06-09
CSN495 - 9 2026-06-28
CSN5213 China Southern Airlines 7 2026-05-11
CSN453 - 7 2026-07-10
CSN464 China Southern Airlines 6 2026-07-25
CSN496 - 5 2026-06-29
CSN467 - 5 2026-06-17
CSN462 China Southern Airlines 5 2026-06-17
CSN5229 China Southern Airlines 4 2026-06-20
CSN5227 - 4 2026-07-14
CSN5220 China Southern Airlines 4 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN487 YVR → YYZ Jul 26, 18:20 UTCJul 26, 22:00 UTC3h 40m
2026-07-25 CSN487 YVR → YYZ Jul 25, 22:05 UTCJul 26, 17:10 UTC19h 6m
2026-07-25 CSN487 YVR → YYZ Jul 25, 18:50 UTCJul 26, 17:10 UTC22h 21m
2026-07-25 CSN464 FRA → PVG Jul 25, 14:05 UTCJul 26, 09:40 UTC19h 36m
2026-07-25 CSN464 FRA → PVG Jul 25, 13:30 UTCJul 26, 09:40 UTC20h 11m
2026-07-24 CSN469 CAN → FRA Jul 24, 19:00 UTCJul 25, 04:15 UTC9h 15m
2026-07-23 CSN470 FRA → CAN Jul 23, 13:40 UTCJul 23, 19:50 UTC6h 10m
2026-07-22 CSN463 - Jul 22, 16:05 UTCJul 23, 10:45 UTC18h 40m
2026-07-22 CSN463 - Jul 22, 15:35 UTCJul 23, 10:45 UTC19h 10m
2026-07-22 CSN463 - Jul 22, 12:05 UTCJul 23, 10:45 UTC22h 40m
2026-07-22 CSN463 - Jul 22, 11:10 UTCJul 23, 10:00 UTC22h 50m
2026-07-22 CSN452 AMS → PVG Jul 22, 04:05 UTCJul 23, 01:50 UTC21h 45m
2026-07-22 CSN452 AMS → PVG Jul 22, 03:35 UTCJul 23, 01:50 UTC22h 15m
2026-07-21 CSN452 AMS → PVG Jul 21, 22:05 UTCJul 22, 16:15 UTC18h 10m
2026-07-21 CSN452 AMS → PVG Jul 21, 21:55 UTCJul 22, 16:15 UTC18h 20m
2026-07-21 CSN451 SZX → AMS Jul 21, 09:05 UTCJul 22, 04:25 UTC19h 20m
2026-07-21 CSN428 ORD → PVG Jul 21, 03:20 UTCJul 22, 01:30 UTC22h 10m
2026-07-20 CSN428 ORD → PVG Jul 20, 22:05 UTCJul 21, 22:00 UTC23h 55m
2026-07-20 CSN428 ORD → PVG Jul 20, 21:05 UTCJul 21, 09:55 UTC12h 49m
2026-07-20 CSN427 ANC → ORD Jul 20, 12:25 UTCJul 20, 17:55 UTC5h 30m
2026-07-20 CSN427 - Jul 20, 04:15 UTCJul 20, 11:10 UTC6h 55m
2026-07-19 CSN452 - Jul 19, 11:40 UTCJul 20, 04:10 UTC16h 30m
2026-07-18 CSN451 SZX → AMS Jul 18, 14:15 UTCJul 19, 08:35 UTC18h 20m
2026-07-18 CSN451 SZX → AMS Jul 18, 08:05 UTCJul 19, 08:00 UTC23h 55m
2026-07-18 CSN438 - Jul 18, 02:05 UTCJul 18, 23:35 UTC21h 31m
2026-07-18 CSN438 - Jul 18, 01:45 UTCJul 18, 23:35 UTC21h 51m
2026-07-17 CSN437 ANC → ORD Jul 17, 16:44 UTCJul 17, 22:20 UTC5h 35m
2026-07-16 CSN437 - Jul 16, 23:25 UTCJul 17, 15:25 UTC16h 0m
2026-07-16 CSN437 - Jul 16, 17:20 UTCJul 17, 15:25 UTC22h 5m
2026-07-16 CSN438 - Jul 16, 12:05 UTCJul 17, 09:30 UTC21h 25m
2026-07-16 CSN438 - Jul 16, 11:20 UTCJul 17, 09:30 UTC22h 10m
2026-07-16 CSN437 - Jul 16, 03:45 UTCJul 16, 08:55 UTC5h 10m
2026-07-15 CSN437 - Jul 15, 18:55 UTCJul 16, 02:35 UTC7h 40m
2026-07-15 CSN437 - Jul 15, 04:05 UTCJul 16, 02:35 UTC22h 30m
2026-07-15 CSN437 - Jul 15, 03:30 UTCJul 16, 02:00 UTC22h 30m
2026-07-14 CSN437 - Jul 14, 21:25 UTCJul 15, 20:00 UTC22h 34m
2026-07-14 CSN5228 - Jul 14, 15:05 UTCJul 15, 04:15 UTC13h 9m
2026-07-14 CSN5227 ANC → ORD Jul 14, 07:05 UTCJul 14, 12:30 UTC5h 25m
2026-07-13 CSN5227 - Jul 13, 15:15 UTCJul 14, 05:45 UTC14h 30m
2026-07-13 CSN5227 - Jul 13, 05:25 UTCJul 13, 23:55 UTC18h 30m
2026-07-13 CSN5227 - Jul 13, 02:30 UTCJul 13, 23:55 UTC21h 25m
2026-07-12 CSN487 ANC → YYZ Jul 12, 17:05 UTCJul 12, 22:30 UTC5h 25m
2026-07-11 CSN487 - Jul 11, 22:01 UTCJul 12, 15:55 UTC17h 55m
2026-07-11 CSN487 - Jul 11, 18:05 UTCJul 12, 15:55 UTC21h 50m
2026-07-11 CSN487 - Jul 11, 16:30 UTCJul 12, 15:55 UTC23h 25m
2026-07-10 CSN453 - Jul 10, 16:40 UTCJul 11, 07:00 UTC14h 20m
2026-07-10 CSN453 - Jul 10, 07:05 UTCJul 11, 06:01 UTC22h 56m
2026-07-10 CSN486 - Jul 10, 04:15 UTCJul 11, 04:01 UTC23h 46m
2026-07-09 CSN485 ANC → YYZ Jul 9, 20:05 UTCJul 10, 02:05 UTC6h 0m
2026-07-09 CSN485 - Jul 9, 11:10 UTCJul 9, 18:40 UTC7h 30m

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 Jul 26, 22:00 UTC.
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, CSN437, CSN485, CSN451, CSN428.