Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781125

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1409 · BOEING 737-800

Hex
781125
Octal
36010445
Decimal
7,868,709
Country
CN
Tail
B-1409
Type
B738
No current signal · last broadcast 8d ago
Flights observed
73
Distinct callsigns
20
Country
CN
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S 781125.

Country allocation

The ICAO 24-bit address 781125 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
CSN3673 - 15 2026-07-05
CSN6705 - 12 2026-06-25
CSN6706 - 9 2026-07-05
CSN3674 - 7 2026-07-05
CSN5885 - 3 2026-07-04
CSN5886 China Southern Airlines 2 2026-06-21
CSN5736 China Southern Airlines 2 2026-06-12
CSN5735 China Southern Airlines 2 2026-06-12
CSN5600 - 2 2026-07-01
CSN5378 China Southern Airlines 2 2026-06-29
CSN5377 China Southern Airlines 2 2026-06-28
CSN8476 China Southern Airlines 1 2026-04-16
CSN8262 - 1 2026-05-31
CSN6894 China Southern Airlines 1 2026-06-20
CSN6893 China Southern Airlines 1 2026-06-19
CSN6568 China Southern Airlines 1 2026-04-19
CSN6106 China Southern Airlines 1 2026-06-03
CSN6050 China Southern Airlines 1 2026-05-09
CSN6049 China Southern Airlines 1 2026-05-09
CSN3958 China Southern Airlines 1 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-05 CSN3673 - Jul 5, 09:15 UTCJul 5, 09:25 UTC10m
2026-07-05 CSN6706 - Jul 5, 07:55 UTCJul 5, 08:05 UTC10m
2026-07-05 CSN3674 - Jul 5, 01:20 UTCJul 5, 01:30 UTC10m
2026-07-04 CSN5885 - Jul 4, 10:45 UTCJul 4, 13:55 UTC3h 10m
2026-07-01 CSN5600 - Jul 1, 11:00 UTCJul 1, 13:55 UTC2h 55m
2026-06-29 CSN5378 SZX → KWE Jun 29, 00:29 UTCJun 29, 00:39 UTC10m
2026-06-28 CSN5377 KWE → SZX Jun 28, 18:14 UTCJun 28, 18:25 UTC10m
2026-06-25 CSN3673 - Jun 25, 10:45 UTCJun 25, 10:55 UTC10m
2026-06-25 CSN6705 - Jun 25, 03:04 UTCJun 25, 03:15 UTC10m
2026-06-22 CSN3673 - Jun 22, 09:19 UTCJun 22, 09:30 UTC10m
2026-06-22 CSN6705 - Jun 22, 02:54 UTCJun 22, 03:05 UTC10m
2026-06-22 - - Jun 22, 01:05 UTCJun 22, 01:15 UTC10m
2026-06-21 CSN5886 SYX → KWE Jun 21, 14:34 UTCJun 21, 14:54 UTC20m
2026-06-21 CSN5885 KWE → SYX Jun 21, 11:34 UTCJun 21, 12:04 UTC30m
2026-06-20 CSN6894 TSN → URC Jun 20, 00:39 UTCJun 20, 00:54 UTC15m
2026-06-19 CSN6893 URC → TSN Jun 19, 13:14 UTCJun 19, 13:39 UTC25m
2026-06-16 CSN5600 - Jun 16, 11:30 UTCJun 17, 05:20 UTC17h 51m
2026-06-12 CSN5736 HAK → KWE Jun 12, 17:20 UTCJun 12, 17:30 UTC10m
2026-06-12 CSN5735 KWE → HAK Jun 12, 15:10 UTCJun 12, 15:25 UTC15m
2026-06-11 CSN5886 SYX → KWE Jun 11, 13:35 UTCJun 11, 13:50 UTC15m
2026-06-10 CSN5885 KWE → SYX Jun 10, 10:55 UTCJun 10, 11:05 UTC10m
2026-06-08 CSN3673 SZX → NNG Jun 8, 13:30 UTCJun 8, 13:40 UTC10m
2026-06-08 CSN6706 WMT → SZX Jun 8, 11:15 UTCJun 8, 12:05 UTC50m
2026-06-08 CSN6705 SZX → WMT Jun 8, 03:00 UTCJun 8, 03:10 UTC10m
2026-06-07 CSN3673 SZX → NNG Jun 7, 11:30 UTCJun 7, 11:40 UTC10m
2026-06-07 CSN6706 WMT → SZX Jun 7, 08:45 UTCJun 7, 09:05 UTC20m
2026-06-07 CSN6705 SZX → WMT Jun 7, 03:00 UTCJun 7, 03:15 UTC15m
2026-06-06 CSN3673 SZX → NNG Jun 6, 15:10 UTCJun 6, 15:19 UTC10m
2026-06-06 CSN6706 WMT → SZX Jun 6, 13:44 UTCJun 6, 14:04 UTC20m
2026-06-06 CSN6705 SZX → WMT Jun 6, 05:15 UTCJun 6, 05:25 UTC10m
2026-06-03 CSN6106 HAK → KWE Jun 3, 03:00 UTCJun 3, 03:10 UTC10m
2026-06-02 CSN5736 HAK → KWE Jun 2, 14:55 UTCJun 3, 01:15 UTC10h 20m
2026-06-02 CSN5735 KWE → HAK Jun 2, 12:50 UTCJun 2, 13:05 UTC15m
2026-06-02 CSN3673 SZX → NNG Jun 2, 09:25 UTCJun 2, 09:35 UTC10m
2026-06-02 CSN3674 NNG → SZX Jun 2, 01:30 UTCJun 2, 01:40 UTC10m
2026-06-01 CSN3673 SZX → NNG Jun 1, 09:10 UTCJun 1, 09:20 UTC10m
2026-06-01 CSN6706 WMT → SZX Jun 1, 07:10 UTCJun 1, 07:25 UTC15m
2026-06-01 CSN6705 SZX → WMT Jun 1, 02:55 UTCJun 1, 03:05 UTC10m
2026-06-01 CSN3674 NNG → SZX Jun 1, 01:40 UTCJun 1, 01:50 UTC10m
2026-05-31 CSN8262 - May 31, 00:30 UTCMay 31, 01:11 UTC41m
2026-05-21 CSN366R - May 21, 05:20 UTCMay 21, 05:30 UTC10m
2026-05-20 CSN3667 KWE → SZX May 20, 19:40 UTCMay 20, 20:00 UTC20m
2026-05-18 CSN3673 SZX → NNG May 18, 09:10 UTCMay 18, 09:25 UTC15m
2026-05-18 CSN6705 SZX → WMT May 18, 02:55 UTCMay 18, 03:10 UTC15m
2026-05-10 CSN3958 YTY → CAN May 10, 01:14 UTCMay 10, 01:24 UTC10m
2026-05-09 CSN6050 CXR → CAN May 9, 11:20 UTCMay 9, 11:50 UTC30m
2026-05-09 CSN6049 CAN → CXR May 9, 06:55 UTCMay 9, 07:10 UTC15m
2026-05-07 CSN3419 CAN → KMG May 7, 14:20 UTCMay 7, 14:45 UTC25m
2026-05-04 CSN3673 SZX → NNG May 4, 09:15 UTCMay 4, 09:25 UTC10m
2026-05-04 CSN6705 SZX → WMT May 4, 02:50 UTCMay 4, 03:00 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-1409 page for operator, model, and routing details .

Mode-S 781125 frequently asked

What is Mode-S code 781125?
781125 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1409.
Where is Mode-S 781125 registered?
Mode-S code 781125 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781125 broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781125, octal 36010445, decimal 7,868,709.
What flights does 781125 operate?
Mode-S 781125 has broadcast 20 distinct callsigns, including CSN3673, CSN6705, CSN6706, CSN3674, CSN5885.