Apparatus

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sensors Mode-S transponder

781703

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20C5 · BOEING 777-300ER

Hex
781703
Octal
36013403
Decimal
7,870,211
Country
CN
Tail
B-20C5
Type
B77W
No current signal · last broadcast 4h ago
Flights observed
95
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 781703.

Country allocation

The ICAO 24-bit address 781703 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
CSN311 - 12 2026-07-07
CSN312 - 11 2026-07-08
CSN385 - 10 2026-07-13
CSN327 - 8 2026-07-12
CSN328 - 7 2026-07-13
CSN386 - 6 2026-07-14
CSN347 China Southern Airlines 5 2026-07-04
CSN3097 - 5 2026-07-07
CSN348 China Southern Airlines 4 2026-07-05
CSN3098 - 4 2026-06-19
CSN3096 China Southern Airlines 4 2026-04-18
CSN3095 China Southern Airlines 4 2026-04-18
CSN600 - 3 2026-07-11
CSN699 - 2 2026-07-09
CSN659 China Southern Airlines 2 2026-06-01
CSN658 China Southern Airlines 2 2026-04-29
CSN660 China Southern Airlines 1 2026-06-02
CSN657 China Southern Airlines 1 2026-04-28
CSN330 China Southern Airlines 1 2026-06-13
CSN329 China Southern Airlines 1 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSN386 - Jul 14, 07:05 UTCJul 14, 08:30 UTC1h 25m
2026-07-13 CSN385 - Jul 13, 16:45 UTCJul 14, 05:25 UTC12h 40m
2026-07-13 CSN328 - Jul 13, 07:01 UTCJul 14, 05:25 UTC22h 25m
2026-07-12 CSN327 - Jul 12, 16:05 UTCJul 13, 03:10 UTC11h 5m
2026-07-11 CSN600 - Jul 11, 11:20 UTCJul 12, 05:25 UTC18h 5m
2026-07-11 CSN600 - Jul 11, 05:31 UTCJul 11, 18:15 UTC12h 45m
2026-07-09 CSN699 - Jul 9, 13:20 UTCJul 10, 02:30 UTC13h 10m
2026-07-08 CSN312 - Jul 8, 06:00 UTCJul 8, 18:30 UTC12h 30m
2026-07-07 CSN311 TPE → YYZ Jul 7, 07:30 UTCJul 8, 02:05 UTC18h 35m
2026-07-07 CSN3097 - Jul 7, 04:10 UTCJul 7, 06:00 UTC1h 50m
2026-07-05 CSN348 CDG → CAN Jul 5, 10:25 UTCJul 5, 16:50 UTC6h 25m
2026-07-04 CSN347 CAN → CDG Jul 4, 22:25 UTCJul 5, 05:05 UTC6h 40m
2026-06-24 CSN312 - Jun 24, 05:44 UTCJun 24, 18:05 UTC12h 20m
2026-06-23 CSN311 - Jun 23, 13:29 UTCJun 24, 02:05 UTC12h 35m
2026-06-22 CSN311 - Jun 22, 18:54 UTCJun 23, 13:39 UTC18h 45m
2026-06-22 CSN328 - Jun 22, 16:50 UTCJun 23, 13:39 UTC20h 50m
2026-06-22 CSN328 - Jun 22, 07:00 UTCJun 22, 19:00 UTC12h 0m
2026-06-21 CSN327 - Jun 21, 16:04 UTCJun 22, 02:50 UTC10h 45m
2026-06-20 CSN328 - Jun 20, 07:00 UTCJun 20, 18:29 UTC11h 30m
2026-06-19 CSN327 - Jun 19, 16:09 UTCJun 20, 02:44 UTC10h 35m
2026-06-19 CSN3098 - Jun 19, 07:34 UTCJun 19, 08:40 UTC1h 5m
2026-06-19 CSN3097 - Jun 19, 04:29 UTCJun 19, 06:04 UTC1h 35m
2026-06-18 CSN386 - Jun 18, 06:55 UTCJun 18, 08:25 UTC1h 30m
2026-06-17 CSN385 - Jun 17, 11:40 UTCJun 18, 05:00 UTC17h 20m
2026-06-17 CSN312 - Jun 17, 05:45 UTCJun 18, 04:45 UTC23h 0m
2026-06-16 CSN311 - Jun 16, 13:34 UTCJun 17, 02:00 UTC12h 26m
2026-06-13 CSN330 YVR → CAN Jun 13, 10:00 UTCJun 13, 19:55 UTC9h 55m
2026-06-12 CSN329 CAN → YVR Jun 12, 22:25 UTCJun 13, 07:15 UTC8h 49m
2026-06-11 CSN3098 TPE → CAN Jun 11, 07:15 UTCJun 11, 08:10 UTC55m
2026-06-11 CSN3097 CAN → TPE Jun 11, 03:50 UTCJun 11, 05:10 UTC1h 20m
2026-06-10 CSN312 YYZ → CAN Jun 10, 05:45 UTCJun 10, 17:50 UTC12h 5m
2026-06-09 CSN311 CAN → YYZ Jun 9, 14:10 UTCJun 10, 02:20 UTC12h 10m
2026-06-06 CSN386 HND → CAN Jun 6, 06:55 UTCJun 6, 08:15 UTC1h 20m
2026-06-05 CSN385 CAN → HND Jun 5, 18:05 UTCJun 6, 04:30 UTC10h 25m
2026-06-05 CSN385 CAN → HND Jun 5, 08:10 UTCJun 6, 04:30 UTC20h 20m
2026-06-05 CSN312 YYZ → CAN Jun 5, 05:40 UTCJun 6, 04:30 UTC22h 50m
2026-06-04 CSN311 CAN → YYZ Jun 4, 13:35 UTCJun 5, 01:30 UTC11h 55m
2026-06-02 CSN660 SFO → WUH Jun 2, 07:45 UTCJun 2, 17:55 UTC10h 10m
2026-06-01 CSN659 WUH → SFO Jun 1, 17:35 UTCJun 2, 03:20 UTC9h 45m
2026-05-31 CSN659 WUH → SFO May 31, 18:50 UTCJun 1, 18:45 UTC23h 55m
2026-05-31 CSN328 LAX → CAN May 31, 01:11 UTCMay 31, 18:55 UTC17h 44m
2026-05-30 CSN327 CAN → LAX May 30, 16:50 UTCMay 31, 12:45 UTC19h 55m
2026-05-30 CSN327 CAN → LAX May 30, 16:20 UTCMay 31, 12:45 UTC20h 25m
2026-05-28 CSN3098 TPE → CAN May 28, 07:10 UTCMay 28, 08:15 UTC1h 5m
2026-05-28 CSN3097 CAN → TPE May 28, 03:55 UTCMay 28, 05:20 UTC1h 25m
2026-05-27 CSN386 HND → CAN May 27, 07:00 UTCMay 27, 08:15 UTC1h 15m
2026-05-26 CSN385 CAN → HND May 26, 17:15 UTCMay 27, 04:45 UTC11h 30m
2026-05-26 CSN328 LAX → CAN May 26, 06:59 UTCMay 26, 18:55 UTC11h 55m
2026-05-25 CSN327 CAN → LAX May 25, 16:25 UTCMay 26, 02:29 UTC10h 5m
2026-05-23 CSN3024 TPE → CGO May 23, 04:05 UTCMay 23, 04:20 UTC15m

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-20C5 page for operator, model, and routing details .

Mode-S 781703 frequently asked

What is Mode-S code 781703?
781703 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20C5.
Where is Mode-S 781703 registered?
Mode-S code 781703 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781703 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 781703, octal 36013403, decimal 7,870,211.
What flights does 781703 operate?
Mode-S 781703 has broadcast 20 distinct callsigns, including CSN311, CSN312, CSN385, CSN327, CSN328.