Apparatus

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sensors Mode-S transponder

781704

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20C6 · BOEING 787-9 Dreamliner

Hex
781704
Octal
36013404
Decimal
7,870,212
Country
CN
Tail
B-20C6
Type
B789
No current signal · last broadcast 3d ago
Flights observed
153
Distinct callsigns
20
Country
CN
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 781704.

Country allocation

The ICAO 24-bit address 781704 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
CSN680 - 22 2026-07-11
CSN679 - 19 2026-07-11
CSN8172 China Southern Airlines 14 2026-07-06
CSN336 China Southern Airlines 13 2026-06-06
CSN8171 - 12 2026-07-05
CSN3092 - 9 2026-06-13
CSN335 China Southern Airlines 7 2026-06-05
CSN8065 China Southern Airlines 5 2026-06-09
CSN391 China Southern Airlines 5 2026-06-12
CSN3091 China Southern Airlines 5 2026-06-13
CSN8066 - 4 2026-06-27
CSN392 China Southern Airlines 4 2026-06-12
CSN303 - 4 2026-06-28
CSN8070 - 3 2026-07-12
CSN6907 - 3 2026-07-10
CSN338 China Southern Airlines 3 2026-05-24
CSN8049 - 2 2026-07-13
CSN6908 - 2 2026-07-08
CSN653 - 2 2026-06-30
CSN608 - 2 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSN8050 - Jul 13, 21:00 UTCJul 14, 11:30 UTC14h 30m
2026-07-13 CSN8049 - Jul 13, 11:40 UTCJul 13, 18:45 UTC7h 5m
2026-07-12 CSN8049 - Jul 12, 19:05 UTCJul 13, 18:45 UTC23h 40m
2026-07-12 CSN8070 - Jul 12, 17:10 UTCJul 13, 17:00 UTC23h 50m
2026-07-12 CSN8070 - Jul 12, 13:05 UTCJul 13, 12:25 UTC23h 20m
2026-07-12 CSN8070 - Jul 12, 10:35 UTCJul 12, 20:15 UTC9h 40m
2026-07-11 CSN680 - Jul 11, 20:10 UTCJul 11, 20:25 UTC15m
2026-07-11 CSN680 - Jul 11, 12:50 UTCJul 11, 14:35 UTC1h 45m
2026-07-11 CSN679 - Jul 11, 03:15 UTCJul 11, 03:35 UTC20m
2026-07-11 CSN679 - Jul 11, 01:20 UTCJul 11, 02:40 UTC1h 20m
2026-07-10 CSN679 - Jul 10, 18:20 UTCJul 10, 18:30 UTC10m
2026-07-10 CSN6907 - Jul 10, 15:50 UTCJul 10, 16:00 UTC10m
2026-07-09 CSN680 - Jul 9, 20:10 UTCJul 9, 20:20 UTC10m
2026-07-09 CSN680 - Jul 9, 12:45 UTCJul 9, 14:30 UTC1h 45m
2026-07-09 CSN679 - Jul 9, 02:30 UTCJul 9, 02:50 UTC20m
2026-07-08 CSN679 - Jul 8, 17:30 UTCJul 9, 01:50 UTC8h 20m
2026-07-08 CSN6907 - Jul 8, 13:10 UTCJul 8, 13:20 UTC10m
2026-07-08 CSN6908 - Jul 8, 04:45 UTCJul 8, 05:00 UTC15m
2026-07-07 CSN680 - Jul 7, 20:15 UTCJul 7, 20:25 UTC10m
2026-07-07 CSN680 - Jul 7, 12:55 UTCJul 7, 14:40 UTC1h 45m
2026-07-07 CSN679 - Jul 7, 02:45 UTCJul 7, 03:05 UTC20m
2026-07-07 CSN679 - Jul 7, 01:00 UTCJul 7, 02:05 UTC1h 5m
2026-07-06 CSN8172 ICN → CGQ Jul 6, 00:50 UTCJul 6, 01:05 UTC15m
2026-07-05 CSN8172 ICN → CGQ Jul 5, 17:55 UTCJul 5, 22:20 UTC4h 25m
2026-07-05 CSN8171 - Jul 5, 07:30 UTCJul 5, 15:20 UTC7h 50m
2026-07-04 CSN680 - Jul 4, 20:25 UTCJul 4, 20:35 UTC10m
2026-07-04 CSN680 - Jul 4, 12:45 UTCJul 4, 14:35 UTC1h 50m
2026-07-04 CSN679 - Jul 4, 03:05 UTCJul 4, 03:25 UTC20m
2026-07-03 CSN679 - Jul 3, 18:20 UTCJul 4, 02:30 UTC8h 10m
2026-06-30 CSN654 - Jun 30, 20:40 UTCJul 1, 02:50 UTC6h 10m
2026-06-30 CSN653 - Jun 30, 07:10 UTCJun 30, 17:10 UTC10h 0m
2026-06-29 CSN653 - Jun 29, 17:40 UTCJun 30, 17:00 UTC23h 20m
2026-06-28 CSN304 LHR → DAC Jun 28, 21:20 UTCJun 29, 15:39 UTC18h 20m
2026-06-28 CSN303 - Jun 28, 08:25 UTCJun 28, 18:29 UTC10h 5m
2026-06-27 CSN303 - Jun 27, 16:14 UTCJun 28, 14:34 UTC22h 20m
2026-06-27 CSN303 - Jun 27, 13:04 UTCJun 28, 11:59 UTC22h 55m
2026-06-27 CSN8066 - Jun 27, 11:55 UTCJun 28, 08:34 UTC20h 40m
2026-06-27 CSN679 - Jun 27, 02:50 UTCJun 27, 03:04 UTC15m
2026-06-26 CSN679 - Jun 26, 17:50 UTCJun 27, 02:14 UTC8h 25m
2026-06-25 CSN680 - Jun 25, 20:19 UTCJun 25, 20:30 UTC10m
2026-06-25 CSN680 - Jun 25, 12:44 UTCJun 25, 14:34 UTC1h 50m
2026-06-25 CSN679 - Jun 25, 02:49 UTCJun 25, 02:59 UTC10m
2026-06-24 CSN679 - Jun 24, 17:45 UTCJun 25, 02:10 UTC8h 25m
2026-06-24 CSN6907 URC → PKX Jun 24, 12:20 UTCJun 24, 12:34 UTC15m
2026-06-24 CSN6908 - Jun 24, 04:44 UTCJun 24, 04:55 UTC10m
2026-06-24 CSN8172 ICN → CGQ Jun 24, 00:49 UTCJun 24, 00:59 UTC10m
2026-06-23 CSN8172 ICN → CGQ Jun 23, 17:54 UTCJun 23, 22:25 UTC4h 30m
2026-06-23 CSN8171 - Jun 23, 07:09 UTCJun 23, 14:39 UTC7h 30m
2026-06-22 CSN690 - Jun 22, 11:04 UTCJun 22, 17:29 UTC6h 25m
2026-06-21 CSN689 - Jun 21, 22:20 UTCJun 22, 05:15 UTC6h 55m

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-20C6 page for operator, model, and routing details .

Mode-S 781704 frequently asked

What is Mode-S code 781704?
781704 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20C6.
Where is Mode-S 781704 registered?
Mode-S code 781704 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781704 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781704, octal 36013404, decimal 7,870,212.
What flights does 781704 operate?
Mode-S 781704 has broadcast 20 distinct callsigns, including CSN680, CSN679, CSN8172, CSN336, CSN8171.