Apparatus

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sensors Mode-S transponder

781941

ICAO 24-bit transponder address · allocated to China

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

Hex
781941
Octal
36014501
Decimal
7,870,785
Country
CN
Tail
B-20EN
Type
B77L
No current signal · last broadcast 3h ago
Flights observed
209
Distinct callsigns
20
Country
CN
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 781941.

Country allocation

The ICAO 24-bit address 781941 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
CSN485 - 30 2026-07-07
CSN486 - 13 2026-07-08
CSN451 China Southern Airlines 13 2026-07-02
CSN427 - 13 2026-07-09
CSN437 - 12 2026-07-10
CSN452 - 11 2026-07-03
CSN496 - 10 2026-07-06
CSN435 - 9 2026-06-30
CSN5213 China Southern Airlines 8 2026-05-04
CSN462 - 8 2026-07-13
CSN461 - 8 2026-07-12
CSN453 - 8 2026-07-13
CSN5214 China Southern Airlines 7 2026-05-05
CSN438 - 7 2026-07-11
CSN428 - 7 2026-07-09
CSN495 - 6 2026-07-05
CSN463 China Southern Airlines 5 2026-06-11
CSN454 China Southern Airlines 5 2026-05-09
CSN470 - 4 2026-06-25
CSN467 China Southern Airlines 4 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSN453 - Jul 13, 22:05 UTCJul 14, 07:30 UTC9h 25m
2026-07-13 CSN453 - Jul 13, 03:40 UTCJul 14, 01:50 UTC22h 10m
2026-07-13 CSN462 - Jul 13, 00:20 UTCJul 13, 22:20 UTC22h 0m
2026-07-12 CSN462 - Jul 12, 22:30 UTCJul 13, 22:15 UTC23h 45m
2026-07-12 CSN462 - Jul 12, 19:01 UTCJul 13, 03:50 UTC8h 50m
2026-07-12 CSN461 - Jul 12, 00:55 UTCJul 12, 16:05 UTC15h 10m
2026-07-11 CSN461 - Jul 11, 19:05 UTCJul 12, 16:05 UTC21h 0m
2026-07-11 CSN461 - Jul 11, 14:20 UTCJul 12, 13:25 UTC23h 5m
2026-07-11 CSN438 - Jul 11, 12:45 UTCJul 12, 10:30 UTC21h 45m
2026-07-10 CSN437 ANC → ORD Jul 10, 18:40 UTCJul 11, 00:00 UTC5h 20m
2026-07-09 CSN437 - Jul 9, 22:20 UTCJul 10, 17:20 UTC19h 0m
2026-07-09 CSN428 - Jul 9, 16:20 UTCJul 10, 16:15 UTC23h 55m
2026-07-09 CSN427 ANC → ORD Jul 9, 08:05 UTCJul 9, 13:40 UTC5h 35m
2026-07-08 CSN427 - Jul 8, 14:00 UTCJul 9, 06:15 UTC16h 15m
2026-07-08 CSN486 - Jul 8, 04:45 UTCJul 8, 23:10 UTC18h 25m
2026-07-08 CSN486 - Jul 8, 02:20 UTCJul 8, 23:10 UTC20h 50m
2026-07-08 CSN486 - Jul 8, 02:05 UTCJul 8, 23:10 UTC21h 5m
2026-07-07 CSN485 ANC → YYZ Jul 7, 17:35 UTCJul 7, 23:05 UTC5h 30m
2026-07-07 CSN485 - Jul 7, 08:30 UTCJul 7, 16:15 UTC7h 45m
2026-07-06 CSN485 - Jul 6, 15:00 UTCJul 7, 10:45 UTC19h 45m
2026-07-06 CSN485 - Jul 6, 12:50 UTCJul 7, 10:45 UTC21h 55m
2026-07-06 CSN496 - Jul 6, 10:20 UTCJul 7, 10:15 UTC23h 55m
2026-07-06 CSN496 - Jul 6, 09:35 UTCJul 6, 15:40 UTC6h 5m
2026-07-05 CSN495 - Jul 5, 14:35 UTCJul 6, 06:40 UTC16h 5m
2026-07-05 CSN486 - Jul 5, 08:20 UTCJul 6, 06:40 UTC22h 20m
2026-07-05 CSN486 - Jul 5, 07:40 UTCJul 6, 06:15 UTC22h 35m
2026-07-05 CSN486 - Jul 5, 03:00 UTCJul 6, 01:00 UTC22h 0m
2026-07-04 CSN485 ANC → YYZ Jul 4, 18:40 UTCJul 5, 00:25 UTC5h 45m
2026-07-04 CSN485 - Jul 4, 10:00 UTCJul 4, 17:30 UTC7h 30m
2026-07-03 CSN485 - Jul 3, 18:00 UTCJul 4, 16:05 UTC22h 5m
2026-07-03 CSN485 - Jul 3, 15:00 UTCJul 4, 11:25 UTC20h 25m
2026-07-03 CSN485 - Jul 3, 12:45 UTCJul 4, 11:25 UTC22h 40m
2026-07-03 CSN452 - Jul 3, 10:20 UTCJul 4, 10:15 UTC23h 55m
2026-07-03 CSN452 - Jul 3, 09:50 UTCJul 3, 18:05 UTC8h 15m
2026-07-02 CSN451 SZX → AMS Jul 2, 12:50 UTCJul 3, 06:10 UTC17h 20m
2026-07-02 CSN438 - Jul 2, 02:20 UTCJul 3, 02:15 UTC23h 55m
2026-07-02 CSN438 - Jul 2, 01:05 UTCJul 3, 00:05 UTC23h 0m
2026-07-01 CSN437 ANC → ORD Jul 1, 16:35 UTCJul 1, 22:20 UTC5h 45m
2026-06-30 CSN437 - Jun 30, 23:15 UTCJul 1, 15:35 UTC16h 20m
2026-06-30 CSN437 - Jun 30, 17:00 UTCJul 1, 15:35 UTC22h 35m
2026-06-30 CSN436 - Jun 30, 11:25 UTCJul 1, 09:45 UTC22h 20m
2026-06-30 CSN435 ANC → ORD Jun 30, 03:05 UTCJun 30, 08:50 UTC5h 45m
2026-06-29 CSN435 - Jun 29, 18:19 UTCJun 30, 01:45 UTC7h 26m
2026-06-29 CSN435 - Jun 29, 01:20 UTCJun 30, 00:14 UTC22h 55m
2026-06-28 CSN435 - Jun 28, 22:20 UTCJun 29, 19:44 UTC21h 25m
2026-06-28 CSN462 FRA → PVG Jun 28, 16:35 UTCJun 29, 01:29 UTC8h 55m
2026-06-27 CSN461 PVG → FRA Jun 27, 19:29 UTCJun 28, 13:40 UTC18h 10m
2026-06-27 CSN461 PVG → FRA Jun 27, 14:20 UTCJun 28, 13:40 UTC23h 20m
2026-06-27 CSN464 - Jun 27, 14:05 UTCJun 28, 12:15 UTC22h 10m
2026-06-26 CSN469 - Jun 26, 22:05 UTCJun 27, 04:19 UTC6h 15m

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

Mode-S 781941 frequently asked

What is Mode-S code 781941?
781941 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20EN.
Where is Mode-S 781941 registered?
Mode-S code 781941 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781941 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781941, octal 36014501, decimal 7,870,785.
What flights does 781941 operate?
Mode-S 781941 has broadcast 20 distinct callsigns, including CSN485, CSN486, CSN451, CSN427, CSN437.