Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 3h ago
Flights observed
156
Distinct callsigns
20
Country
CN
Last broadcast
3h ago

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 - 15 2026-07-04
CSN3047 China Southern Airlines 13 2026-06-14
CSN3048 China Southern Airlines 12 2026-06-14
CSN8012 - 10 2026-07-03
CSN8362 - 9 2026-07-04
CSN5056 - 9 2026-06-18
CSN366 - 9 2026-07-15
CSN8011 - 8 2026-07-03
CSN5055 - 8 2026-06-17
CSN397 - 8 2026-07-04
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
2026-07-15 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
2026-06-21 CSN3409 - Jun 21, 00:55 UTCJun 21, 01:49 UTC55m
2026-06-20 CSN398 - Jun 20, 10:15 UTCJun 20, 11:49 UTC1h 35m
2026-06-20 CSN397 - Jun 20, 06:19 UTCJun 20, 08:19 UTC2h 0m
2026-06-20 CSN366 - Jun 20, 02:54 UTCJun 20, 03:04 UTC10m
2026-06-20 CSN366 - Jun 20, 00:14 UTCJun 20, 00:29 UTC15m
2026-06-19 CSN365 - Jun 19, 10:19 UTCJun 19, 13:39 UTC3h 20m
2026-06-18 CSN5056 - Jun 18, 08:35 UTCJun 18, 08:55 UTC20m
2026-06-17 CSN5055 - Jun 17, 17:50 UTCJun 18, 07:50 UTC14h 0m
2026-06-15 CSN3508 NKG → CAN Jun 15, 17:30 UTCJun 15, 17:40 UTC10m
2026-06-14 CSN3048 KUL → CAN Jun 14, 07:25 UTCJun 14, 10:15 UTC2h 50m
2026-06-14 CSN3047 CAN → KUL Jun 14, 01:45 UTCJun 14, 05:20 UTC3h 35m
2026-06-12 CSN398 MNL → CAN Jun 12, 11:30 UTCJun 12, 11:45 UTC15m
2026-06-12 CSN398 MNL → CAN Jun 12, 10:10 UTCJun 12, 10:40 UTC30m
2026-06-12 CSN397 - Jun 12, 06:40 UTCJun 12, 08:25 UTC1h 45m
2026-06-12 CSN3497 CAN → KMG Jun 12, 00:05 UTCJun 12, 00:25 UTC20m
2026-06-11 CSN3092 MNL → CAN Jun 11, 05:50 UTCJun 11, 06:15 UTC25m
2026-06-11 CSN3092 MNL → CAN Jun 11, 04:25 UTCJun 11, 04:55 UTC30m
2026-06-11 CSN3091 CAN → MNL Jun 11, 00:45 UTCJun 11, 02:40 UTC1h 55m
2026-06-10 CSN3048 KUL → CAN Jun 10, 09:35 UTCJun 10, 09:45 UTC10m
2026-06-10 CSN3048 KUL → CAN Jun 10, 06:55 UTCJun 10, 07:10 UTC15m
2026-06-10 CSN3047 CAN → KUL Jun 10, 04:35 UTCJun 10, 05:10 UTC35m

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 3h ago.
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, CSN3047, CSN3048, CSN8012, CSN8362.