Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781121

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1402 · BOEING 737-800

Hex
781121
Octal
36010441
Decimal
7,868,705
Country
CN
Tail
B-1402
Type
B738
No current signal · last broadcast 11h ago
Flights observed
60
Distinct callsigns
20
Country
CN
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S 781121.

Country allocation

The ICAO 24-bit address 781121 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
CSN5052 China Southern Airlines 7 2026-05-30
CSN3780 - 7 2026-07-08
CSN3631 - 5 2026-07-04
CSN6079 - 4 2026-06-29
CSN5051 China Southern Airlines 4 2026-05-30
CSN3774 - 4 2026-07-20
CSN3355 - 4 2026-07-17
CSN6080 - 3 2026-06-29
CSN3140 - 3 2026-07-05
CSN8476 China Southern Airlines 2 2026-05-18
CSN3356 China Southern Airlines 2 2026-07-04
CSN3078 - 2 2026-06-26
CSN3016 China Southern Airlines 2 2026-06-12
CSN3015 China Southern Airlines 2 2026-06-12
CSN8706 China Southern Airlines 1 2026-06-30
CSN8585 - 1 2026-07-16
CSN8475 China Southern Airlines 1 2026-04-22
CSN8279 China Southern Airlines 1 2026-04-26
CSN3880 - 1 2026-06-02
CSN3779 - 1 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 CSN3774 - Jul 20, 23:10 UTCJul 20, 23:25 UTC15m
2026-07-17 CSN3355 - Jul 17, 08:49 UTCJul 17, 09:15 UTC25m
2026-07-16 CSN8585 - Jul 16, 01:20 UTCJul 16, 10:10 UTC8h 50m
2026-07-08 CSN3780 - Jul 8, 01:20 UTCJul 8, 04:40 UTC3h 20m
2026-07-07 CSN3780 - Jul 7, 06:40 UTCJul 8, 04:40 UTC22h 0m
2026-07-07 CSN3779 - Jul 7, 03:10 UTCJul 8, 01:20 UTC22h 10m
2026-07-06 CSN3632 - Jul 6, 05:25 UTCJul 7, 03:20 UTC21h 55m
2026-07-05 CSN3140 - Jul 5, 15:25 UTCJul 6, 05:45 UTC14h 20m
2026-07-05 CSN3780 - Jul 5, 01:15 UTCJul 5, 04:40 UTC3h 25m
2026-07-04 CSN3356 SZX → WUH Jul 4, 14:55 UTCJul 4, 15:05 UTC10m
2026-07-04 CSN3355 - Jul 4, 13:10 UTCJul 4, 13:20 UTC10m
2026-07-04 CSN3631 - Jul 4, 01:10 UTCJul 4, 05:30 UTC4h 20m
2026-06-30 CSN8706 PKX → WUH Jun 30, 14:25 UTCJun 30, 14:40 UTC15m
2026-06-29 CSN6080 - Jun 29, 05:30 UTCJun 29, 06:05 UTC35m
2026-06-29 CSN6079 - Jun 29, 02:54 UTCJun 29, 03:34 UTC40m
2026-06-28 CSN3140 - Jun 28, 12:50 UTCJun 28, 13:04 UTC15m
2026-06-26 CSN3078 - Jun 26, 01:50 UTCJun 26, 02:05 UTC15m
2026-06-26 CSN3078 - Jun 26, 00:24 UTCJun 26, 00:59 UTC35m
2026-06-25 CSN3077 - Jun 25, 17:34 UTCJun 25, 19:20 UTC1h 45m
2026-06-23 CSN3780 - Jun 23, 01:00 UTCJun 23, 09:24 UTC8h 25m
2026-06-22 CSN3774 TNA → ZUH Jun 22, 08:19 UTCJun 22, 08:29 UTC10m
2026-06-22 CSN3752 - Jun 22, 02:34 UTCJun 22, 02:45 UTC10m
2026-06-17 CSN3774 TNA → ZUH Jun 17, 11:50 UTCJun 17, 12:00 UTC10m
2026-06-16 CSN3774 TNA → ZUH Jun 16, 09:20 UTCJun 16, 09:30 UTC10m
2026-06-15 CSN6080 ICN → WUH Jun 15, 05:20 UTCJun 15, 06:04 UTC45m
2026-06-15 CSN6079 - Jun 15, 03:00 UTCJun 15, 03:45 UTC45m
2026-06-12 CSN3016 TPE → WUH Jun 12, 11:25 UTCJun 12, 11:50 UTC25m
2026-06-12 CSN3015 WUH → TPE Jun 12, 09:15 UTCJun 12, 10:00 UTC45m
2026-06-10 CSN3631 SZX → HZA Jun 10, 01:20 UTCJun 10, 05:35 UTC4h 15m
2026-06-09 CSN3631 SZX → HZA Jun 9, 09:50 UTCJun 10, 05:35 UTC19h 45m
2026-06-09 CSN3631 SZX → HZA Jun 9, 05:35 UTCJun 10, 01:40 UTC20h 5m
2026-06-09 CSN3631 SZX → HZA Jun 9, 01:25 UTCJun 9, 10:05 UTC8h 40m
2026-06-08 CSN3140 PKX → WUH Jun 8, 12:45 UTCJun 8, 12:55 UTC10m
2026-06-08 CSN3780 NGB → CAN Jun 8, 00:50 UTCJun 8, 04:35 UTC3h 45m
2026-06-05 CSN3016 TPE → WUH Jun 5, 11:55 UTCJun 5, 12:15 UTC20m
2026-06-05 CSN3015 WUH → TPE Jun 5, 09:25 UTCJun 5, 10:20 UTC55m
2026-06-02 CSN3880 - Jun 2, 11:40 UTCJun 2, 11:55 UTC15m
2026-05-30 CSN5052 MNL → CAN May 30, 21:10 UTCMay 30, 21:40 UTC30m
2026-05-30 CSN5051 YYZ → CAN May 30, 16:05 UTCMay 30, 17:55 UTC1h 50m
2026-05-28 CSN5052 MNL → CAN May 28, 21:25 UTCMay 28, 21:55 UTC30m
2026-05-28 CSN5052 MNL → CAN May 28, 20:05 UTCMay 28, 20:30 UTC25m
2026-05-28 CSN5051 YYZ → CAN May 28, 16:00 UTCMay 28, 17:35 UTC1h 35m
2026-05-22 CSN6080 ICN → WUH May 22, 05:25 UTCMay 22, 05:50 UTC25m
2026-05-22 CSN6079 WUH → ICN May 22, 03:05 UTCMay 22, 03:45 UTC40m
2026-05-21 CSN6079 WUH → ICN May 21, 04:25 UTCMay 22, 03:45 UTC23h 20m
2026-05-21 CSN3780 NGB → CAN May 21, 01:00 UTCMay 21, 04:40 UTC3h 40m
2026-05-18 CSN5052 MNL → CAN May 18, 21:30 UTCMay 18, 21:55 UTC25m
2026-05-18 CSN5052 MNL → CAN May 18, 20:05 UTCMay 18, 20:40 UTC35m
2026-05-18 CSN5051 YYZ → CAN May 18, 16:00 UTCMay 18, 17:40 UTC1h 40m
2026-05-18 CSN8476 CXR → CAN May 18, 06:01 UTCMay 18, 06:10 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-1402 page for operator, model, and routing details .

Mode-S 781121 frequently asked

What is Mode-S code 781121?
781121 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1402.
Where is Mode-S 781121 registered?
Mode-S code 781121 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781121 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781121, octal 36010441, decimal 7,868,705.
What flights does 781121 operate?
Mode-S 781121 has broadcast 20 distinct callsigns, including CSN5052, CSN3780, CSN3631, CSN6079, CSN5051.