Apparatus

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sensors Mode-S transponder

781503

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-205L · BOEING 737 MAX 8

Hex
781503
Octal
36012403
Decimal
7,869,699
Country
CN
Tail
B-205L
Type
B38M
No current signal · last broadcast Jul 26, 09:35 UTC
Flights observed
177
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 09:35 UTC

Last known position

Most recent position reported by Mode-S 781503.

Country allocation

The ICAO 24-bit address 781503 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
CSN398 China Southern Airlines 21 2026-07-24
CSN8012 China Southern Airlines 13 2026-07-26
CSN3047 China Southern Airlines 13 2026-06-14
CSN8011 China Southern Airlines 12 2026-07-26
CSN3048 China Southern Airlines 12 2026-06-14
CSN397 China Southern Airlines 11 2026-07-24
CSN5056 - 10 2026-07-18
CSN8362 - 9 2026-07-04
CSN5055 China Southern Airlines 9 2026-07-17
CSN366 - 9 2026-07-15
CSN365 - 8 2026-07-14
CSN8071 China Southern Airlines 6 2026-05-23
CSN8072 China Southern Airlines 4 2026-04-19
CSN3092 - 4 2026-07-12
CSN8361 - 3 2026-07-03
CSN8347 China Southern Airlines 3 2026-05-01
CSN8348 China Southern Airlines 2 2026-05-01
CSN8020 China Southern Airlines 2 2026-05-29
CSN8019 China Southern Airlines 2 2026-05-29
CSN5052 - 2 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN8012 MEL → CAN Jul 26, 09:20 UTCJul 26, 09:35 UTC15m
2026-07-26 CSN8011 CAN → MEL Jul 26, 04:25 UTCJul 26, 07:20 UTC2h 56m
2026-07-25 CSN8012 MEL → CAN Jul 25, 09:25 UTCJul 25, 09:40 UTC15m
2026-07-25 CSN8011 CAN → MEL Jul 25, 04:20 UTCJul 25, 07:25 UTC3h 5m
2026-07-24 CSN398 MNL → CAN Jul 24, 11:25 UTCJul 24, 11:55 UTC30m
2026-07-24 CSN398 MNL → CAN Jul 24, 10:00 UTCJul 24, 10:35 UTC35m
2026-07-24 CSN397 CAN → MNL Jul 24, 06:45 UTCJul 24, 08:30 UTC1h 45m
2026-07-22 CSN3049 CAN → HAN Jul 22, 03:35 UTCJul 22, 04:45 UTC1h 10m
2026-07-20 CSN8012 MEL → CAN Jul 20, 09:10 UTCJul 20, 09:25 UTC15m
2026-07-20 CSN8011 CAN → MEL Jul 20, 07:00 UTCJul 20, 07:45 UTC45m
2026-07-20 CSN8011 CAN → MEL Jul 20, 04:10 UTCJul 20, 04:20 UTC10m
2026-07-19 CSN398 - Jul 19, 11:45 UTCJul 19, 12:00 UTC15m
2026-07-19 CSN398 - Jul 19, 10:20 UTCJul 19, 10:50 UTC30m
2026-07-19 CSN397 CAN → MNL Jul 19, 07:10 UTCJul 19, 08:50 UTC1h 40m
2026-07-19 CSN3812 - Jul 19, 04:05 UTCJul 19, 04:35 UTC30m
2026-07-18 CSN5056 - Jul 18, 08:20 UTCJul 18, 08:40 UTC20m
2026-07-17 CSN5055 CAN → POM Jul 17, 17:50 UTCJul 18, 07:20 UTC13h 31m
2026-07-16 CSN398 - Jul 16, 11:45 UTCJul 16, 12:05 UTC20m
2026-07-16 CSN398 - Jul 16, 10:20 UTCJul 16, 10:50 UTC30m
2026-07-16 CSN397 - Jul 16, 07:00 UTCJul 16, 08:55 UTC1h 55m
2026-07-16 CSN3812 - Jul 16, 04:10 UTCJul 16, 04:20 UTC10m
2026-07-15 CSN366 - Jul 15, 00:30 UTCJul 15, 00:50 UTC20m
2026-07-14 CSN365 - Jul 14, 13:15 UTCJul 14, 13:55 UTC40m
2026-07-14 CSN365 - Jul 14, 10:30 UTCJul 14, 10:40 UTC10m
2026-07-12 CSN3092 - Jul 12, 05:15 UTCJul 12, 05:35 UTC20m
2026-07-12 CSN3092 - Jul 12, 03:55 UTCJul 12, 04:25 UTC30m
2026-07-12 CSN3091 - Jul 12, 00:20 UTCJul 12, 02:15 UTC1h 55m
2026-07-11 CSN366 - Jul 11, 00:05 UTCJul 11, 00:20 UTC15m
2026-07-10 CSN365 - Jul 10, 12:45 UTCJul 10, 13:25 UTC40m
2026-07-10 CSN365 - Jul 10, 10:00 UTCJul 10, 10:10 UTC10m
2026-07-09 CSN5052 - Jul 9, 21:15 UTCJul 9, 21:45 UTC30m
2026-07-09 CSN5052 - Jul 9, 19:55 UTCJul 9, 20:25 UTC30m
2026-07-09 CSN5051 - Jul 9, 16:05 UTCJul 9, 17:40 UTC1h 35m
2026-07-06 CSN3801 - Jul 6, 11:40 UTCJul 6, 12:40 UTC1h 0m
2026-07-04 CSN398 - Jul 4, 13:25 UTCJul 4, 13:40 UTC15m
2026-07-04 CSN398 - Jul 4, 11:55 UTCJul 4, 12:35 UTC40m
2026-07-04 CSN397 - Jul 4, 08:35 UTCJul 4, 10:20 UTC1h 45m
2026-07-04 CSN8362 - Jul 4, 02:55 UTCJul 4, 03:15 UTC20m
2026-07-04 CSN8362 - Jul 4, 01:30 UTCJul 4, 02:05 UTC35m
2026-07-03 CSN8362 - Jul 3, 21:55 UTCJul 3, 22:05 UTC10m
2026-07-03 CSN8361 - Jul 3, 15:00 UTCJul 3, 16:40 UTC1h 40m
2026-07-03 CSN8012 - Jul 3, 08:55 UTCJul 3, 09:05 UTC10m
2026-07-03 CSN8011 - Jul 3, 07:00 UTCJul 3, 07:20 UTC20m
2026-06-29 CSN3803 - Jun 29, 01:34 UTCJun 29, 01:44 UTC10m
2026-06-27 CSN8012 - Jun 27, 09:04 UTCJun 27, 11:50 UTC2h 45m
2026-06-27 CSN8011 - Jun 27, 06:50 UTCJun 27, 07:30 UTC40m
2026-06-26 CSN398 - Jun 26, 11:40 UTCJun 26, 12:00 UTC20m
2026-06-26 CSN398 - Jun 26, 10:20 UTCJun 26, 10:50 UTC30m
2026-06-26 CSN397 - Jun 26, 06:50 UTCJun 26, 08:40 UTC1h 50m
2026-06-26 CSN3497 CAN → KMG Jun 26, 00:05 UTCJun 26, 00:15 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-205L page for operator, model, and routing details .

Mode-S 781503 frequently asked

What is Mode-S code 781503?
781503 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-205L.
Where is Mode-S 781503 registered?
Mode-S code 781503 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781503 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 09:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781503, octal 36012403, decimal 7,869,699.
What flights does 781503 operate?
Mode-S 781503 has broadcast 20 distinct callsigns, including CSN398, CSN8012, CSN3047, CSN8011, CSN3048.