Apparatus

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sensors Mode-S transponder

781741

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-309Y · AIRBUS A-320neo

Hex
781741
Octal
36013501
Decimal
7,870,273
Country
CN
Tail
B-309Y
Type
A20N
No current signal · last broadcast 4h ago
Flights observed
143
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 781741.

Country allocation

The ICAO 24-bit address 781741 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
CSN6465 - 8 2026-07-11
CSN652 - 7 2026-07-13
CSN651 - 5 2026-07-10
CSN6483 China Southern Airlines 5 2026-04-26
CSN6388 - 5 2026-07-14
CSN6312 - 5 2026-06-18
CSN6309 - 5 2026-06-20
CSN671 - 4 2026-07-12
CSN6469 - 4 2026-07-06
CSN6311 - 4 2026-06-18
CSN5366 - 4 2026-07-01
CSN3956 - 4 2026-06-23
CSN3955 - 4 2026-06-23
CSN672 - 3 2026-07-12
CSN6416 China Southern Airlines 3 2026-07-07
CSN6339 China Southern Airlines 3 2026-05-25
CSN6315 - 3 2026-07-08
CSN6304 - 3 2026-06-25
CSN6254 China Southern Airlines 3 2026-05-16
CSN6253 China Southern Airlines 3 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSN6388 - Jul 14, 12:20 UTCJul 14, 12:30 UTC10m
2026-07-14 CSN682 - Jul 14, 04:00 UTCJul 14, 07:50 UTC3h 50m
2026-07-14 CSN681 - Jul 14, 01:50 UTCJul 14, 02:15 UTC25m
2026-07-13 CSN652 - Jul 13, 02:55 UTCJul 13, 03:20 UTC25m
2026-07-12 CSN672 ICN → ICN Jul 12, 13:05 UTCJul 13, 01:45 UTC12h 40m
2026-07-12 CSN671 - Jul 12, 11:01 UTCJul 12, 11:25 UTC25m
2026-07-12 CSN6402 - Jul 12, 07:31 UTCJul 12, 07:45 UTC15m
2026-07-11 CSN6465 - Jul 11, 09:00 UTCJul 12, 07:45 UTC22h 45m
2026-07-10 CSN6465 - Jul 10, 15:00 UTCJul 11, 09:25 UTC18h 26m
2026-07-10 CSN652 - Jul 10, 03:35 UTCJul 10, 15:05 UTC11h 30m
2026-07-10 CSN651 - Jul 10, 02:05 UTCJul 10, 02:25 UTC20m
2026-07-09 CSN652 - Jul 9, 03:00 UTCJul 9, 03:25 UTC25m
2026-07-09 CSN651 - Jul 9, 00:50 UTCJul 9, 01:10 UTC20m
2026-07-08 CSN6315 - Jul 8, 02:35 UTCJul 8, 13:35 UTC11h 0m
2026-07-07 CSN6416 XIY → SHE Jul 7, 01:30 UTCJul 7, 06:05 UTC4h 35m
2026-07-06 CSN6469 - Jul 6, 04:55 UTCJul 7, 01:45 UTC20h 50m
2026-07-06 CSN6469 - Jul 6, 01:20 UTCJul 6, 05:15 UTC3h 55m
2026-07-03 CSN6529 - Jul 3, 12:25 UTCJul 4, 04:10 UTC15h 45m
2026-07-02 CSN6416 XIY → SHE Jul 2, 01:25 UTCJul 2, 05:00 UTC3h 35m
2026-07-01 CSN5366 - Jul 1, 09:45 UTCJul 2, 05:00 UTC19h 15m
2026-06-30 CSN672 - Jun 30, 12:45 UTCJul 1, 09:55 UTC21h 10m
2026-06-30 CSN671 - Jun 30, 07:30 UTCJun 30, 11:20 UTC3h 50m
2026-06-29 CSN671 - Jun 29, 13:24 UTCJun 30, 11:20 UTC21h 56m
2026-06-29 CSN666 - Jun 29, 02:25 UTCJun 29, 13:30 UTC11h 5m
2026-06-28 CSN665 - Jun 28, 23:54 UTCJun 29, 01:05 UTC1h 10m
2026-06-27 CSN6674 TFU → SHE Jun 27, 06:40 UTCJun 27, 12:50 UTC6h 10m
2026-06-27 CSN652 - Jun 27, 02:55 UTCJun 27, 03:15 UTC20m
2026-06-27 CSN651 - Jun 27, 00:55 UTCJun 27, 01:15 UTC20m
2026-06-26 CSN6347 - Jun 26, 00:15 UTCJun 26, 13:15 UTC13h 0m
2026-06-25 CSN6304 - Jun 25, 21:50 UTCJun 25, 22:10 UTC20m
2026-06-25 CSN3455 - Jun 25, 07:19 UTCJun 25, 07:30 UTC10m
2026-06-24 CSN6849 - Jun 24, 23:50 UTCJun 24, 23:59 UTC10m
2026-06-24 CSN8700 - Jun 24, 16:19 UTCJun 24, 16:45 UTC25m
2026-06-24 CSN8699 - Jun 24, 09:39 UTCJun 24, 09:49 UTC10m
2026-06-24 CSN3622 - Jun 24, 07:40 UTCJun 24, 07:50 UTC10m
2026-06-24 CSN3621 - Jun 24, 01:34 UTCJun 24, 01:44 UTC10m
2026-06-23 CSN3956 - Jun 23, 17:30 UTCJun 23, 17:39 UTC10m
2026-06-23 CSN3955 - Jun 23, 13:24 UTCJun 23, 13:39 UTC15m
2026-06-22 CSN6303 - Jun 22, 14:40 UTCJun 23, 08:50 UTC18h 10m
2026-06-22 CSN6465 - Jun 22, 08:54 UTCJun 22, 14:45 UTC5h 50m
2026-06-21 CSN6465 - Jun 21, 12:35 UTCJun 22, 09:19 UTC20h 45m
2026-06-21 CSN652 - Jun 21, 03:00 UTCJun 21, 03:19 UTC20m
2026-06-21 CSN651 SHE → ICN Jun 21, 00:55 UTCJun 21, 01:14 UTC20m
2026-06-20 CSN6310 - Jun 20, 09:34 UTCJun 20, 12:09 UTC2h 35m
2026-06-20 CSN6309 - Jun 20, 07:19 UTCJun 20, 07:34 UTC15m
2026-06-20 CSN6309 - Jun 20, 04:54 UTCJun 20, 05:09 UTC15m
2026-06-18 CSN6312 - Jun 18, 12:50 UTCJun 18, 13:05 UTC15m
2026-06-18 CSN6311 - Jun 18, 08:40 UTCJun 18, 09:05 UTC25m
2026-06-09 CSN6310 SZX → SHE Jun 9, 09:45 UTCJun 9, 09:55 UTC10m
2026-06-09 CSN6309 SHE → SZX Jun 9, 07:30 UTCJun 9, 07:40 UTC10m

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-309Y page for operator, model, and routing details .

Mode-S 781741 frequently asked

What is Mode-S code 781741?
781741 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-309Y.
Where is Mode-S 781741 registered?
Mode-S code 781741 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781741 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 781741, octal 36013501, decimal 7,870,273.
What flights does 781741 operate?
Mode-S 781741 has broadcast 20 distinct callsigns, including CSN6465, CSN652, CSN651, CSN6483, CSN6388.