Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
No current signal · last broadcast 4h ago
Flights observed
69
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 781738.

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
CSN3097 China Southern Airlines 7 2026-05-30
CSN329 China Southern Airlines 5 2026-05-12
CSN327 China Southern Airlines 5 2026-05-16
CSN311 China Southern Airlines 5 2026-05-03
CSN304 China Southern Airlines 5 2026-05-15
CSN659 China Southern Airlines 4 2026-05-28
CSN328 China Southern Airlines 4 2026-05-17
CSN3098 China Southern Airlines 4 2026-05-30
CSN660 China Southern Airlines 3 2026-05-29
CSN386 China Southern Airlines 3 2026-05-02
CSN385 China Southern Airlines 3 2026-05-02
CSN348 China Southern Airlines 3 2026-05-10
CSN347 China Southern Airlines 3 2026-05-09
CSN312 China Southern Airlines 3 2026-05-04
CSN303 China Southern Airlines 3 2026-05-15
CSN699 China Southern Airlines 2 2026-05-21
CSN658 China Southern Airlines 2 2026-05-20
CSN330 China Southern Airlines 2 2026-05-13
CSN657 China Southern Airlines 1 2026-05-19
CSN600 China Southern Airlines 1 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-05-30 CSN3097 CAN → TPE May 30, 04:10 UTCMay 30, 04:35 UTC25m
2026-05-30 - - May 30, 01:25 UTCMay 30, 01:35 UTC10m
2026-05-29 CSN660 SFO → WUH May 29, 07:55 UTCMay 29, 19:50 UTC11h 55m
2026-05-28 CSN659 WUH → SFO May 28, 17:25 UTCMay 29, 03:15 UTC9h 50m
2026-05-26 CSN660 SFO → WUH May 26, 07:45 UTCMay 26, 19:15 UTC11h 30m
2026-05-25 CSN659 WUH → SFO May 25, 17:50 UTCMay 26, 03:30 UTC9h 40m
2026-05-23 CSN600 JFK → CAN May 23, 05:15 UTCMay 23, 11:35 UTC6h 20m
2026-05-21 CSN699 CAN → JFK May 21, 12:45 UTCMay 22, 01:30 UTC12h 45m
2026-05-20 CSN699 CAN → JFK May 20, 18:05 UTCMay 21, 14:05 UTC20h 0m
2026-05-20 CSN658 SFO → CAN May 20, 17:15 UTCMay 21, 14:05 UTC20h 50m
2026-05-20 CSN658 SFO → CAN May 20, 07:40 UTCMay 20, 18:45 UTC11h 5m
2026-05-19 CSN657 HRB → NRT May 19, 17:40 UTCMay 20, 03:10 UTC9h 30m
2026-05-19 CSN3098 TPE → CAN May 19, 07:25 UTCMay 19, 08:25 UTC1h 0m
2026-05-19 CSN3097 CAN → TPE May 19, 04:55 UTCMay 19, 05:35 UTC40m
2026-05-19 CSN3097 CAN → TPE May 19, 03:55 UTCMay 19, 04:20 UTC25m
2026-05-17 CSN328 LAX → CAN May 17, 06:50 UTCMay 17, 18:15 UTC11h 25m
2026-05-16 CSN327 CAN → LAX May 16, 16:31 UTCMay 17, 02:30 UTC10h 0m
2026-05-16 CSN327 CAN → LAX May 16, 03:05 UTCMay 17, 02:00 UTC22h 55m
2026-05-16 CSN327 CAN → LAX May 16, 00:05 UTCMay 16, 18:10 UTC18h 6m
2026-05-15 CSN304 LHR → CAN May 15, 22:05 UTCMay 16, 18:10 UTC20h 6m
2026-05-15 CSN304 LHR → CAN May 15, 21:25 UTCMay 16, 18:00 UTC20h 36m
2026-05-15 CSN303 CAN → LHR May 15, 11:05 UTCMay 15, 17:55 UTC6h 49m
2026-05-13 CSN330 YVR → CAN May 13, 07:45 UTCMay 13, 17:50 UTC10h 5m
2026-05-12 CSN329 CAN → YVR May 12, 19:30 UTCMay 13, 04:40 UTC9h 10m
2026-05-10 CSN348 CDG → CAN May 10, 10:24 UTCMay 10, 16:34 UTC6h 10m
2026-05-09 CSN347 CAN → CDG May 9, 22:05 UTCMay 10, 05:10 UTC7h 5m
2026-05-08 CSN660 SFO → WUH May 8, 07:50 UTCMay 8, 19:25 UTC11h 35m
2026-05-07 CSN659 WUH → SFO May 7, 17:25 UTCMay 8, 03:04 UTC9h 39m
2026-05-07 CSN659 WUH → SFO May 7, 00:05 UTCMay 7, 18:50 UTC18h 45m
2026-05-06 CSN304 LHR → CAN May 6, 22:05 UTCMay 7, 18:50 UTC20h 45m
2026-05-06 CSN304 LHR → CAN May 6, 21:30 UTCMay 7, 18:50 UTC21h 20m
2026-05-06 CSN303 CAN → LHR May 6, 11:05 UTCMay 6, 18:35 UTC7h 29m
2026-05-04 CSN312 YYZ → CAN May 4, 05:40 UTCMay 4, 18:30 UTC12h 50m
2026-05-03 CSN311 CAN → YYZ May 3, 13:35 UTCMay 4, 01:15 UTC11h 40m
2026-05-02 CSN386 HND → CAN May 2, 06:55 UTCMay 2, 08:15 UTC1h 20m
2026-05-02 CSN385 CAN → HND May 2, 03:20 UTCMay 2, 04:40 UTC1h 20m
2026-05-01 CSN348 CDG → CAN May 1, 10:30 UTCMay 1, 17:05 UTC6h 35m
2026-04-30 CSN347 CAN → CDG Apr 30, 22:00 UTCMay 1, 04:55 UTC6h 55m
2026-04-30 CSN386 HND → CAN Apr 30, 06:50 UTCApr 30, 08:10 UTC1h 20m
2026-04-30 CSN385 CAN → HND Apr 30, 03:10 UTCApr 30, 04:20 UTC1h 10m
2026-04-29 CSN386 HND → CAN Apr 29, 06:45 UTCApr 29, 08:10 UTC1h 25m
2026-04-29 CSN385 CAN → HND Apr 29, 03:19 UTCApr 29, 04:25 UTC1h 5m
2026-04-27 CSN304 LHR → CAN Apr 27, 21:20 UTCApr 28, 03:40 UTC6h 20m
2026-04-27 CSN303 CAN → LHR Apr 27, 11:00 UTCApr 27, 18:00 UTC7h 0m
2026-04-26 CSN3098 TPE → CAN Apr 26, 06:55 UTCApr 26, 08:05 UTC1h 10m
2026-04-26 CSN3097 CAN → TPE Apr 26, 03:50 UTCApr 26, 05:15 UTC1h 25m
2026-04-25 CSN348 CDG → CAN Apr 25, 10:35 UTCApr 25, 16:45 UTC6h 10m
2026-04-24 CSN347 CAN → CDG Apr 24, 22:15 UTCApr 25, 05:30 UTC7h 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-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?
No active broadcast right now. Last signal was 4h ago.
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 CSN3097, CSN329, CSN327, CSN311, CSN304.