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 Jul 26, 22:15 UTC
Flights observed
242
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 22:15 UTC

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
CSN427 - 17 2026-07-16
CSN451 - 15 2026-07-15
CSN437 China Southern Airlines 15 2026-07-26
CSN486 - 13 2026-07-08
CSN452 - 12 2026-07-15
CSN461 China Southern Airlines 11 2026-07-19
CSN453 China Southern Airlines 11 2026-07-17
CSN496 - 10 2026-07-06
CSN462 China Southern Airlines 10 2026-07-22
CSN435 - 9 2026-06-30
CSN5213 China Southern Airlines 8 2026-05-04
CSN428 China Southern Airlines 8 2026-07-17
CSN5214 China Southern Airlines 7 2026-05-05
CSN454 China Southern Airlines 7 2026-07-18
CSN438 - 7 2026-07-11
CSN495 - 6 2026-07-05
CSN467 - 5 2026-07-22
CSN463 China Southern Airlines 5 2026-06-11
CSN5229 China Southern Airlines 4 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN437 PVG → ANC Jul 26, 18:10 UTCJul 26, 22:15 UTC4h 5m
2026-07-26 CSN437 PVG → ANC Jul 26, 04:10 UTCJul 26, 17:10 UTC13h 1m
2026-07-25 CSN437 PVG → ANC Jul 25, 21:50 UTCJul 26, 17:10 UTC19h 21m
2026-07-25 CSN5230 ORD → PVG Jul 25, 15:45 UTCJul 26, 09:50 UTC18h 6m
2026-07-25 CSN5229 TAO → YVR Jul 25, 07:55 UTCJul 25, 13:10 UTC5h 15m
2026-07-24 CSN5229 TAO → YVR Jul 24, 16:20 UTCJul 25, 06:35 UTC14h 15m
2026-07-24 CSN5229 TAO → YVR Jul 24, 10:30 UTCJul 25, 06:35 UTC20h 5m
2026-07-24 CSN5229 TAO → YVR Jul 24, 06:20 UTCJul 25, 06:15 UTC23h 55m
2026-07-24 CSN5228 MEL → TSN Jul 24, 04:25 UTCJul 25, 00:50 UTC20h 25m
2026-07-23 CSN5227 CAN → MEL Jul 23, 21:00 UTCJul 24, 02:05 UTC5h 5m
2026-07-23 CSN5227 CAN → MEL Jul 23, 00:50 UTCJul 23, 19:00 UTC18h 10m
2026-07-22 CSN5227 CAN → MEL Jul 22, 21:35 UTCJul 23, 19:00 UTC21h 25m
2026-07-22 CSN5227 CAN → MEL Jul 22, 18:20 UTCJul 23, 18:15 UTC23h 55m
2026-07-22 CSN462 FRA → PVG Jul 22, 16:20 UTCJul 23, 13:20 UTC21h 0m
2026-07-22 CSN462 FRA → PVG Jul 22, 16:10 UTCJul 23, 13:20 UTC21h 10m
2026-07-22 CSN467 - Jul 22, 10:20 UTCJul 22, 13:35 UTC3h 15m
2026-07-19 CSN468 FRA → CAN Jul 19, 17:45 UTCJul 19, 23:30 UTC5h 45m
2026-07-19 CSN461 PVG → FRA Jul 19, 05:35 UTCJul 19, 14:55 UTC9h 20m
2026-07-18 CSN461 PVG → FRA Jul 18, 15:40 UTCJul 19, 14:15 UTC22h 35m
2026-07-18 CSN461 PVG → FRA Jul 18, 12:20 UTCJul 19, 12:10 UTC23h 50m
2026-07-18 CSN454 AMS → AMS Jul 18, 10:25 UTCJul 19, 05:50 UTC19h 25m
2026-07-17 CSN453 PVG → AMS Jul 17, 17:35 UTCJul 18, 08:25 UTC14h 51m
2026-07-17 CSN453 PVG → AMS Jul 17, 10:55 UTCJul 18, 08:25 UTC21h 31m
2026-07-17 CSN453 PVG → AMS Jul 17, 06:20 UTCJul 18, 05:25 UTC23h 6m
2026-07-17 CSN428 ORD → PVG Jul 17, 04:49 UTCJul 18, 02:40 UTC21h 50m
2026-07-16 CSN427 ANC → ORD Jul 16, 20:35 UTCJul 17, 01:55 UTC5h 20m
2026-07-16 CSN427 - Jul 16, 10:59 UTCJul 16, 18:29 UTC7h 30m
2026-07-15 CSN427 - Jul 15, 22:20 UTCJul 16, 18:29 UTC20h 10m
2026-07-15 CSN427 - Jul 15, 18:20 UTCJul 16, 18:15 UTC23h 55m
2026-07-15 CSN452 - Jul 15, 16:55 UTCJul 16, 12:30 UTC19h 35m
2026-07-15 CSN451 - Jul 15, 04:40 UTCJul 15, 14:00 UTC9h 20m
2026-07-14 CSN451 - Jul 14, 12:20 UTCJul 15, 11:30 UTC23h 9m
2026-07-14 CSN454 - Jul 14, 11:50 UTCJul 15, 08:30 UTC20h 39m
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

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 Jul 26, 22:15 UTC.
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, CSN427, CSN451, CSN437, CSN486.