Apparatus

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sensors Mode-S transponder

781B6E

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-323E · AIRBUS A-320neo

Hex
781B6E
Octal
36015556
Decimal
7,871,342
Country
CN
Tail
B-323E
Type
A20N
No current signal · last broadcast 20h ago
Flights observed
112
Distinct callsigns
20
Country
CN
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S 781B6E.

Country allocation

The ICAO 24-bit address 781B6E 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
CSN691 China Southern Airlines 18 2026-07-21
CSN692 - 17 2026-07-21
CSN683 China Southern Airlines 15 2026-07-20
CSN684 - 8 2026-07-07
CSN3743 - 6 2026-07-16
CSN3744 - 5 2026-07-14
CSN6251 - 4 2026-07-17
CSN6657 - 3 2026-06-24
CSN6208 - 3 2026-06-25
CSN8719 China Southern Airlines 2 2026-04-28
CSN8325 - 2 2026-06-26
CSN6257 - 2 2026-06-29
CSN6220 China Southern Airlines 2 2026-05-29
CSN6214 China Southern Airlines 2 2026-05-22
CSN5968 China Southern Airlines 2 2026-06-11
CSN3615 - 2 2026-06-27
CSN8720 China Southern Airlines 1 2026-04-28
CSN8640 China Southern Airlines 1 2026-04-26
CSN8639 China Southern Airlines 1 2026-04-26
CSN8635 China Southern Airlines 1 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 CSN692 - Jul 21, 11:05 UTCJul 21, 11:45 UTC40m
2026-07-21 CSN691 HRB → ICN Jul 21, 04:45 UTCJul 21, 09:25 UTC4h 40m
2026-07-20 CSN683 HRB → ICN Jul 20, 11:05 UTCJul 21, 02:25 UTC15h 19m
2026-07-20 CSN683 HRB → ICN Jul 20, 06:15 UTCJul 21, 02:25 UTC20h 9m
2026-07-19 CSN692 - Jul 19, 10:55 UTCJul 20, 06:20 UTC19h 25m
2026-07-19 CSN691 HRB → ICN Jul 19, 04:00 UTCJul 19, 09:10 UTC5h 10m
2026-07-18 CSN683 - Jul 18, 08:20 UTCJul 19, 02:20 UTC18h 0m
2026-07-18 CSN683 - Jul 18, 03:35 UTCJul 19, 02:20 UTC22h 45m
2026-07-17 CSN6251 - Jul 17, 00:20 UTCJul 17, 09:35 UTC9h 15m
2026-07-16 CSN6251 - Jul 16, 11:50 UTCJul 17, 09:35 UTC21h 45m
2026-07-16 CSN3743 - Jul 16, 04:25 UTCJul 16, 04:40 UTC15m
2026-07-14 CSN3744 - Jul 14, 11:55 UTCJul 14, 12:10 UTC15m
2026-07-14 CSN3744 - Jul 14, 09:35 UTCJul 14, 09:50 UTC15m
2026-07-14 CSN3743 - Jul 14, 07:20 UTCJul 14, 07:30 UTC10m
2026-07-14 CSN3743 - Jul 14, 04:25 UTCJul 14, 04:40 UTC15m
2026-07-12 CSN6213 - Jul 12, 01:05 UTCJul 12, 01:20 UTC15m
2026-07-10 CSN6251 - Jul 10, 01:05 UTCJul 10, 15:20 UTC14h 15m
2026-07-09 CSN3744 - Jul 9, 12:15 UTCJul 10, 09:15 UTC21h 0m
2026-07-09 CSN3744 - Jul 9, 09:45 UTCJul 9, 10:00 UTC15m
2026-07-09 CSN3743 - Jul 9, 07:15 UTCJul 9, 07:30 UTC15m
2026-07-09 CSN3743 - Jul 9, 04:35 UTCJul 9, 04:50 UTC15m
2026-07-07 CSN692 - Jul 7, 12:00 UTCJul 7, 12:25 UTC25m
2026-07-07 CSN691 - Jul 7, 08:45 UTCJul 7, 09:15 UTC30m
2026-07-07 CSN684 - Jul 7, 04:25 UTCJul 7, 08:00 UTC3h 35m
2026-07-07 CSN683 - Jul 7, 02:10 UTCJul 7, 02:30 UTC20m
2026-07-07 CSN683 - Jul 7, 01:30 UTCJul 7, 01:40 UTC10m
2026-07-06 CSN6277 - Jul 6, 01:35 UTCJul 6, 01:45 UTC10m
2026-07-05 CSN6141 - Jul 5, 10:00 UTCJul 5, 16:15 UTC6h 15m
2026-07-04 CSN6251 - Jul 4, 05:50 UTCJul 4, 09:10 UTC3h 20m
2026-07-02 CSN692 - Jul 2, 10:45 UTCJul 2, 11:10 UTC25m
2026-07-02 CSN691 - Jul 2, 08:30 UTCJul 2, 09:25 UTC55m
2026-07-02 CSN684 - Jul 2, 04:30 UTCJul 2, 04:45 UTC15m
2026-07-02 CSN683 - Jul 2, 01:15 UTCJul 2, 02:05 UTC50m
2026-07-01 CSN683 - Jul 1, 04:25 UTCJul 2, 02:05 UTC21h 40m
2026-06-29 CSN6257 - Jun 29, 06:29 UTCJun 30, 01:09 UTC18h 40m
2026-06-29 CSN6257 - Jun 29, 02:20 UTCJun 30, 01:09 UTC22h 50m
2026-06-28 CSN692 - Jun 28, 10:50 UTCJun 29, 06:50 UTC20h 0m
2026-06-28 CSN691 - Jun 28, 08:50 UTCJun 28, 09:10 UTC20m
2026-06-27 CSN3615 - Jun 27, 14:14 UTCJun 28, 08:19 UTC18h 5m
2026-06-27 CSN3615 - Jun 27, 08:55 UTCJun 28, 04:35 UTC19h 40m
2026-06-26 CSN8325 - Jun 26, 05:50 UTCJun 27, 02:09 UTC20h 20m
2026-06-26 CSN8325 - Jun 26, 01:50 UTCJun 26, 15:20 UTC13h 30m
2026-06-25 CSN6208 - Jun 25, 11:04 UTCJun 25, 11:15 UTC10m
2026-06-24 CSN6657 - Jun 24, 23:34 UTCJun 24, 23:45 UTC10m
2026-06-24 CSN6208 - Jun 24, 11:20 UTCJun 24, 11:34 UTC15m
2026-06-23 CSN6267 - Jun 23, 23:29 UTCJun 23, 23:39 UTC10m
2026-06-23 CSN6658 HRB → PKX Jun 23, 08:59 UTCJun 23, 09:20 UTC20m
2026-06-22 CSN6657 - Jun 22, 23:35 UTCJun 22, 23:45 UTC10m
2026-06-22 CSN5984 - Jun 22, 14:34 UTCJun 22, 14:45 UTC10m
2026-06-21 CSN692 - Jun 21, 10:54 UTCJun 21, 11:44 UTC50m

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-323E page for operator, model, and routing details .

Mode-S 781B6E frequently asked

What is Mode-S code 781B6E?
781B6E is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-323E.
Where is Mode-S 781B6E registered?
Mode-S code 781B6E is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781B6E broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781B6E, octal 36015556, decimal 7,871,342.
What flights does 781B6E operate?
Mode-S 781B6E has broadcast 20 distinct callsigns, including CSN691, CSN692, CSN683, CSN684, CSN3743.