Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781401

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1125 · BOEING 737-800

Hex
781401
Octal
36012001
Decimal
7,869,441
Country
CN
Tail
B-1125
Type
B738
No current signal · last broadcast 2h ago
Flights observed
121
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 781401.

Country allocation

The ICAO 24-bit address 781401 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
CSN3771 - 9 2026-07-04
CSN3881 - 8 2026-07-06
CSN3689 China Southern Airlines 8 2026-06-14
CSN8437 - 6 2026-07-09
CSN3755 - 6 2026-07-11
CSN3791 - 5 2026-07-07
CSN3749 China Southern Airlines 5 2026-06-08
CSN8285 - 4 2026-07-12
CSN3761 - 4 2026-07-03
CSN3729 - 4 2026-07-14
CSN3690 - 4 2026-06-14
CSN5829 China Southern Airlines 3 2026-05-21
CSN5777 China Southern Airlines 3 2026-05-20
CSN3735 - 3 2026-07-03
CSN8701 - 2 2026-06-12
CSN8418 - 2 2026-07-09
CSN8417 - 2 2026-07-09
CSN6906 China Southern Airlines 2 2026-06-05
CSN3882 China Southern Airlines 2 2026-06-02
CSN3767 - 2 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSN3729 - Jul 14, 07:05 UTCJul 14, 07:20 UTC15m
2026-07-13 CSN3956 - Jul 13, 16:15 UTCJul 13, 16:25 UTC10m
2026-07-13 CSN5844 - Jul 13, 09:50 UTCJul 13, 11:05 UTC1h 15m
2026-07-13 CSN5843 - Jul 13, 03:50 UTCJul 13, 04:00 UTC10m
2026-07-12 CSN8474 - Jul 12, 21:40 UTCJul 12, 22:00 UTC20m
2026-07-12 CSN8473 - Jul 12, 16:15 UTCJul 12, 16:25 UTC10m
2026-07-12 CSN3828 - Jul 12, 11:55 UTCJul 12, 12:15 UTC20m
2026-07-12 CSN3827 - Jul 12, 07:20 UTCJul 12, 07:31 UTC10m
2026-07-12 CSN8285 - Jul 12, 00:35 UTCJul 12, 00:45 UTC10m
2026-07-11 CSN3755 - Jul 11, 08:01 UTCJul 11, 08:15 UTC15m
2026-07-11 CSN3767 - Jul 11, 01:05 UTCJul 11, 01:20 UTC15m
2026-07-09 CSN8437 - Jul 9, 08:20 UTCJul 9, 08:35 UTC15m
2026-07-09 CSN8418 - Jul 9, 06:45 UTCJul 9, 07:05 UTC20m
2026-07-09 CSN8417 - Jul 9, 01:15 UTCJul 9, 01:30 UTC15m
2026-07-07 - - Jul 7, 14:15 UTCJul 7, 14:25 UTC10m
2026-07-07 CSN3791 - Jul 7, 03:55 UTCJul 7, 04:05 UTC10m
2026-07-06 CSN3881 - Jul 6, 11:40 UTCJul 6, 11:55 UTC15m
2026-07-05 CSN8437 - Jul 5, 08:55 UTCJul 5, 09:10 UTC15m
2026-07-05 CSN8418 - Jul 5, 07:05 UTCJul 5, 07:25 UTC20m
2026-07-04 - - Jul 4, 18:00 UTCJul 4, 18:20 UTC20m
2026-07-04 CSN3771 - Jul 4, 06:00 UTCJul 4, 06:15 UTC15m
2026-07-04 CSN3771 - Jul 4, 01:35 UTCJul 4, 01:50 UTC15m
2026-07-03 CSN3736 - Jul 3, 19:05 UTCJul 3, 19:20 UTC15m
2026-07-03 CSN3735 - Jul 3, 09:50 UTCJul 3, 10:00 UTC10m
2026-07-03 CSN3761 - Jul 3, 00:00 UTCJul 3, 00:10 UTC10m
2026-07-01 CSN6748 CAN → SYX Jul 1, 22:55 UTCJul 1, 23:05 UTC10m
2026-06-14 CSN3690 - Jun 14, 06:05 UTCJun 14, 06:55 UTC50m
2026-06-14 CSN3689 ZUH → PVG Jun 14, 01:30 UTCJun 14, 01:40 UTC10m
2026-06-13 CSN3665 ZUH → HFE Jun 13, 00:20 UTCJun 13, 00:35 UTC15m
2026-06-12 CSN3755 ZUH → PVG Jun 12, 08:15 UTCJun 12, 08:25 UTC10m
2026-06-12 CSN8701 - Jun 12, 01:40 UTCJun 12, 01:55 UTC15m
2026-06-11 CSN3690 PVG → ZUH Jun 11, 02:20 UTCJun 11, 07:05 UTC4h 45m
2026-06-11 CSN3689 ZUH → PVG Jun 11, 01:35 UTCJun 11, 01:45 UTC10m
2026-06-10 CSN3747 ZUH → KMG Jun 10, 10:15 UTCJun 10, 11:05 UTC50m
2026-06-10 CSN3689 ZUH → PVG Jun 10, 02:25 UTCJun 10, 02:35 UTC10m
2026-06-08 CSN3729 CAN → LZH Jun 8, 08:10 UTCJun 8, 08:25 UTC15m
2026-06-08 CSN3749 ZUH → HGH Jun 8, 00:20 UTCJun 8, 00:30 UTC10m
2026-06-07 CSN3771 ZUH → CGO Jun 7, 05:40 UTCJun 7, 05:55 UTC15m
2026-06-06 CSN3881 ZUH → HGH Jun 6, 12:40 UTCJun 6, 12:54 UTC15m
2026-06-05 CSN6906 PKX → URC Jun 5, 12:50 UTCJun 5, 13:15 UTC25m
2026-06-05 CSN3761 ZUH → XIY Jun 5, 00:05 UTCJun 5, 00:20 UTC15m
2026-06-04 - - Jun 4, 06:50 UTCJun 4, 07:05 UTC15m
2026-06-04 CSN3689 ZUH → PVG Jun 4, 01:20 UTCJun 4, 01:35 UTC15m
2026-06-03 CSN3771 ZUH → CGO Jun 3, 05:45 UTCJun 3, 06:05 UTC20m
2026-06-03 CSN3771 ZUH → CGO Jun 3, 01:35 UTCJun 3, 01:45 UTC10m
2026-06-02 CSN3882 HGH → ZUH Jun 2, 14:20 UTCJun 2, 14:40 UTC20m
2026-06-02 CSN3881 ZUH → HGH Jun 2, 09:15 UTCJun 2, 09:25 UTC10m
2026-06-01 CSN8437 ZUH → TFU Jun 1, 07:25 UTCJun 1, 07:35 UTC10m
2026-06-01 CSN8285 ZUH → CKG Jun 1, 00:35 UTCJun 1, 00:50 UTC15m
2026-05-31 CSN3882 HGH → ZUH May 31, 14:05 UTCMay 31, 14:20 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-1125 page for operator, model, and routing details .

Mode-S 781401 frequently asked

What is Mode-S code 781401?
781401 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1125.
Where is Mode-S 781401 registered?
Mode-S code 781401 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781401 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781401, octal 36012001, decimal 7,869,441.
What flights does 781401 operate?
Mode-S 781401 has broadcast 20 distinct callsigns, including CSN3771, CSN3881, CSN3689, CSN8437, CSN3755.