Apparatus

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sensors Mode-S transponder

781738

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20CK · BOEING 777-300ER

Hex
781738
Octal
36013470
Decimal
7,870,264
Country
CN
Tail
B-20CK
Type
B77W
Broadcasting now · callsign CSN327 · 35,000 ft
Flights observed
117
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 11:45 UTC

Current position

781738 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 781738 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
CSN329 - 9 2026-07-07
CSN313 China Southern Airlines 8 2026-07-25
CSN328 - 7 2026-07-06
CSN327 - 7 2026-07-05
CSN3097 China Southern Airlines 7 2026-05-30
CSN3095 China Southern Airlines 7 2026-07-26
CSN385 - 6 2026-07-15
CSN314 China Southern Airlines 6 2026-07-25
CSN311 - 6 2026-07-14
CSN348 - 5 2026-07-13
CSN347 - 5 2026-07-12
CSN3098 - 5 2026-07-14
CSN304 China Southern Airlines 5 2026-05-15
CSN659 China Southern Airlines 4 2026-05-28
CSN386 - 4 2026-07-16
CSN330 - 4 2026-07-08
CSN312 - 4 2026-07-15
CSN660 China Southern Airlines 3 2026-05-29
CSN303 China Southern Airlines 3 2026-05-15
CSN699 China Southern Airlines 2 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN3096 TPE → PVG Jul 26, 11:00 UTCJul 26, 11:45 UTC45m
2026-07-26 CSN3095 PVG → TPE Jul 26, 03:50 UTCJul 26, 09:25 UTC5h 36m
2026-07-25 CSN313 PVG → ICN Jul 25, 11:05 UTCJul 26, 02:05 UTC15h 0m
2026-07-25 CSN3095 PVG → TPE Jul 25, 09:00 UTCJul 25, 09:15 UTC15m
2026-07-25 CSN314 ICN → PVG Jul 25, 04:15 UTCJul 25, 04:55 UTC40m
2026-07-24 CSN313 PVG → ICN Jul 24, 11:05 UTCJul 25, 02:15 UTC15h 10m
2026-07-24 CSN3095 PVG → TPE Jul 24, 04:00 UTCJul 24, 09:30 UTC5h 30m
2026-07-23 CSN313 PVG → ICN Jul 23, 11:00 UTCJul 24, 02:00 UTC15h 0m
2026-07-23 CSN3095 PVG → TPE Jul 23, 09:00 UTCJul 23, 09:20 UTC20m
2026-07-23 CSN314 ICN → PVG Jul 23, 04:05 UTCJul 23, 04:40 UTC35m
2026-07-22 CSN313 PVG → ICN Jul 22, 11:30 UTCJul 23, 02:00 UTC14h 30m
2026-07-22 CSN3095 PVG → TPE Jul 22, 11:15 UTCJul 22, 11:25 UTC10m
2026-07-22 CSN314 - Jul 22, 04:05 UTCJul 22, 04:45 UTC40m
2026-07-21 CSN313 PVG → ICN Jul 21, 10:55 UTCJul 22, 01:45 UTC14h 50m
2026-07-21 CSN314 ICN → TPE Jul 21, 04:30 UTCJul 21, 09:15 UTC4h 45m
2026-07-20 CSN313 - Jul 20, 10:55 UTCJul 21, 02:05 UTC15h 10m
2026-07-20 CSN314 ICN → TPE Jul 20, 04:00 UTCJul 20, 09:05 UTC5h 5m
2026-07-19 CSN3096 TPE → PVG Jul 19, 11:10 UTCJul 20, 01:45 UTC14h 35m
2026-07-19 CSN3095 ICN → TPE Jul 19, 03:50 UTCJul 19, 09:15 UTC5h 25m
2026-07-18 CSN313 - Jul 18, 11:30 UTCJul 19, 02:10 UTC14h 40m
2026-07-18 CSN3095 - Jul 18, 08:50 UTCJul 18, 09:15 UTC25m
2026-07-18 CSN314 - Jul 18, 04:00 UTCJul 18, 04:35 UTC35m
2026-07-18 CSN313 - Jul 18, 01:34 UTCJul 18, 02:19 UTC45m
2026-07-16 CSN3529 CAN → TYN Jul 16, 08:05 UTCJul 17, 02:25 UTC18h 20m
2026-07-16 CSN386 - Jul 16, 07:00 UTCJul 17, 02:25 UTC19h 25m
2026-07-15 CSN385 - Jul 15, 11:30 UTCJul 16, 05:00 UTC17h 30m
2026-07-15 CSN385 - Jul 15, 06:05 UTCJul 16, 05:00 UTC22h 55m
2026-07-15 CSN312 - Jul 15, 05:40 UTCJul 16, 04:00 UTC22h 20m
2026-07-14 CSN311 - Jul 14, 13:15 UTCJul 15, 01:10 UTC11h 54m
2026-07-14 CSN3098 - Jul 14, 07:10 UTCJul 14, 08:20 UTC1h 10m
2026-07-13 CSN348 - Jul 13, 11:10 UTCJul 14, 05:15 UTC18h 5m
2026-07-12 CSN347 - Jul 12, 21:55 UTCJul 13, 04:50 UTC6h 55m
2026-07-10 CSN348 - Jul 10, 10:25 UTCJul 10, 16:45 UTC6h 20m
2026-07-09 CSN347 - Jul 9, 21:55 UTCJul 10, 04:55 UTC7h 0m
2026-07-08 CSN330 - Jul 8, 08:10 UTCJul 8, 19:10 UTC11h 0m
2026-07-07 CSN329 - Jul 7, 19:10 UTCJul 8, 04:20 UTC9h 10m
2026-07-07 CSN329 - Jul 7, 08:05 UTCJul 8, 04:20 UTC20h 15m
2026-07-07 CSN329 - Jul 7, 07:10 UTCJul 8, 04:20 UTC21h 10m
2026-07-06 CSN328 - Jul 6, 17:20 UTCJul 7, 04:50 UTC11h 30m
2026-07-06 CSN328 - Jul 6, 08:05 UTCJul 7, 04:50 UTC20h 45m
2026-07-06 CSN328 - Jul 6, 07:30 UTCJul 7, 04:50 UTC21h 20m
2026-07-05 CSN327 - Jul 5, 08:05 UTCJul 6, 02:30 UTC18h 25m
2026-07-05 CSN327 HND → LAX Jul 5, 06:50 UTCJul 6, 02:30 UTC19h 40m
2026-07-05 CSN385 - Jul 5, 03:10 UTCJul 5, 04:50 UTC1h 40m
2026-07-04 CSN330 - Jul 4, 08:00 UTCJul 4, 18:05 UTC10h 5m
2026-07-03 CSN329 - Jul 3, 19:30 UTCJul 4, 05:15 UTC9h 45m
2026-06-27 CSN6890 - Jun 27, 10:00 UTCJun 27, 10:10 UTC10m
2026-06-24 CSN6890 - Jun 24, 10:04 UTCJun 24, 10:14 UTC10m
2026-05-30 CSN3098 TPE → CAN May 30, 07:20 UTCMay 30, 08:30 UTC1h 10m
2026-05-30 CSN3097 CAN → TPE May 30, 05:05 UTCMay 30, 05:40 UTC35m

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

Mode-S 781738 frequently asked

What is Mode-S code 781738?
781738 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20CK.
Where is Mode-S 781738 registered?
Mode-S code 781738 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781738 broadcasting right now?
Yes. Mode-S 781738 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781738, octal 36013470, decimal 7,870,264.
What flights does 781738 operate?
Mode-S 781738 has broadcast 20 distinct callsigns, including CSN329, CSN313, CSN328, CSN327, CSN3097.