Apparatus

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sensors Mode-S transponder

78135F

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1241 · BOEING 737-800

Hex
78135F
Octal
36011537
Decimal
7,869,279
Country
CN
Tail
B-1241
Type
B738
No current signal · last broadcast Jul 26, 02:20 UTC
Flights observed
189
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 02:20 UTC

Last known position

Most recent position reported by Mode-S 78135F.

Country allocation

The ICAO 24-bit address 78135F 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
CSN3881 - 15 2026-07-14
CSN3689 - 11 2026-07-15
CSN3882 - 9 2026-06-28
CSN3735 - 9 2026-07-12
CSN8285 China Southern Airlines 7 2026-07-23
CSN3791 China Southern Airlines 7 2026-07-26
CSN3761 - 7 2026-07-12
CSN8701 - 6 2026-07-22
CSN8437 - 6 2026-07-06
CSN6906 - 6 2026-06-29
CSN3719 - 6 2026-07-15
CSN3665 - 6 2026-07-11
CSN3736 - 5 2026-07-12
CSN3733 China Southern Airlines 5 2026-07-25
CSN3690 - 5 2026-07-15
CSN8474 China Southern Airlines 4 2026-07-23
CSN8417 - 4 2026-07-14
CSN5844 - 4 2026-07-19
CSN3828 - 4 2026-07-23
CSN3749 - 4 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN3791 ZUH → TYN Jul 26, 02:10 UTCJul 26, 02:20 UTC10m
2026-07-25 CSN3733 ZUH → PEK Jul 25, 04:05 UTCJul 25, 04:30 UTC25m
2026-07-25 CSN3733 ZUH → PEK Jul 25, 02:10 UTCJul 25, 02:20 UTC10m
2026-07-24 CSN5733 CAN → CQW Jul 24, 13:50 UTCJul 24, 14:00 UTC10m
2026-07-24 CSN3729 CAN → LZH Jul 24, 06:55 UTCJul 24, 07:05 UTC10m
2026-07-24 CSN3465 SZX → CKG Jul 24, 00:55 UTCJul 24, 01:05 UTC10m
2026-07-23 CSN8474 SGN → SZX Jul 23, 22:15 UTCJul 23, 22:30 UTC15m
2026-07-23 CSN3828 - Jul 23, 13:40 UTCJul 23, 14:05 UTC25m
2026-07-23 CSN3466 CKG → SZX Jul 23, 05:35 UTCJul 23, 05:45 UTC10m
2026-07-23 CSN8285 ZUH → CKG Jul 23, 00:30 UTCJul 23, 00:40 UTC10m
2026-07-22 CSN8701 - Jul 22, 13:35 UTCJul 22, 13:45 UTC10m
2026-07-22 - - Jul 22, 04:50 UTCJul 22, 05:00 UTC10m
2026-07-21 CSN5861 SZX → CTU Jul 21, 23:25 UTCJul 21, 23:40 UTC15m
2026-07-21 CSN3828 - Jul 21, 15:30 UTCJul 21, 15:55 UTC25m
2026-07-21 CSN3827 - Jul 21, 08:25 UTCJul 21, 08:35 UTC10m
2026-07-21 CSN8285 ZUH → CKG Jul 21, 00:25 UTCJul 21, 00:40 UTC15m
2026-07-20 CSN8701 - Jul 20, 12:30 UTCJul 20, 12:45 UTC15m
2026-07-20 CSN3451 - Jul 20, 06:35 UTCJul 20, 06:50 UTC15m
2026-07-20 CSN5862 - Jul 20, 04:40 UTCJul 20, 04:50 UTC10m
2026-07-19 CSN5861 - Jul 19, 23:30 UTCJul 19, 23:40 UTC10m
2026-07-19 CSN3956 HAK → SZX Jul 19, 16:25 UTCJul 19, 16:45 UTC20m
2026-07-19 CSN5844 - Jul 19, 09:40 UTCJul 19, 11:15 UTC1h 35m
2026-07-19 CSN5843 - Jul 19, 03:55 UTCJul 19, 04:05 UTC10m
2026-07-18 CSN8474 - Jul 18, 22:10 UTCJul 18, 22:25 UTC15m
2026-07-18 CSN8473 - Jul 18, 15:05 UTCJul 18, 15:15 UTC10m
2026-07-18 CSN3828 - Jul 18, 12:50 UTCJul 18, 13:25 UTC35m
2026-07-18 CSN3827 - Jul 18, 07:20 UTCJul 18, 07:30 UTC10m
2026-07-18 CSN8285 - Jul 18, 00:29 UTCJul 18, 00:39 UTC10m
2026-07-17 CSN8701 - Jul 17, 11:35 UTCJul 17, 11:50 UTC15m
2026-07-17 CSN3733 - Jul 17, 03:10 UTCJul 17, 03:20 UTC10m
2026-07-16 CSN5733 - Jul 16, 13:40 UTCJul 16, 13:49 UTC10m
2026-07-16 CSN3729 - Jul 16, 07:15 UTCJul 16, 07:25 UTC10m
2026-07-15 CSN3719 - Jul 15, 11:35 UTCJul 15, 11:45 UTC10m
2026-07-15 CSN3690 - Jul 15, 07:45 UTCJul 15, 07:55 UTC10m
2026-07-15 CSN3689 - Jul 15, 01:40 UTCJul 15, 01:55 UTC15m
2026-07-14 CSN3881 - Jul 14, 09:20 UTCJul 14, 09:30 UTC10m
2026-07-14 CSN8417 - Jul 14, 01:40 UTCJul 14, 01:55 UTC15m
2026-07-13 CSN3791 - Jul 13, 02:10 UTCJul 13, 02:20 UTC10m
2026-07-12 CSN3736 - Jul 12, 14:50 UTCJul 12, 15:05 UTC15m
2026-07-12 CSN3735 - Jul 12, 08:30 UTCJul 12, 08:45 UTC15m
2026-07-12 CSN3761 - Jul 12, 00:01 UTCJul 12, 00:20 UTC20m
2026-07-11 CSN3665 - Jul 11, 00:25 UTCJul 11, 00:35 UTC10m
2026-07-10 CSN3729 - Jul 10, 07:35 UTCJul 10, 07:50 UTC15m
2026-07-10 CSN3465 - Jul 10, 01:25 UTCJul 10, 01:35 UTC10m
2026-07-09 CSN3956 - Jul 9, 19:20 UTCJul 9, 19:40 UTC20m
2026-07-09 CSN3955 - Jul 9, 15:05 UTCJul 9, 15:20 UTC15m
2026-07-09 CSN5844 - Jul 9, 12:40 UTCJul 9, 13:20 UTC40m
2026-07-09 CSN5843 - Jul 9, 04:05 UTCJul 9, 04:20 UTC15m
2026-07-08 CSN8474 - Jul 8, 22:00 UTCJul 8, 22:15 UTC15m
2026-07-08 CSN8473 - Jul 8, 16:40 UTCJul 8, 16:50 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-1241 page for operator, model, and routing details .

Mode-S 78135F frequently asked

What is Mode-S code 78135F?
78135F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1241.
Where is Mode-S 78135F registered?
Mode-S code 78135F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 78135F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 02:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 78135F, octal 36011537, decimal 7,869,279.
What flights does 78135F operate?
Mode-S 78135F has broadcast 20 distinct callsigns, including CSN3881, CSN3689, CSN3882, CSN3735, CSN8285.