Apparatus

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sensors Mode-S transponder

781500

ICAO 24-bit transponder address · allocated to China

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

Hex
781500
Octal
36012400
Decimal
7,869,696
Country
CN
Tail
B-205J
Type
B38M
No current signal · last broadcast Jul 25, 16:55 UTC
Flights observed
192
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 16:55 UTC

Last known position

Most recent position reported by Mode-S 781500.

Country allocation

The ICAO 24-bit address 781500 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 - 25 2026-07-14
CSN8011 - 14 2026-07-17
CSN397 - 14 2026-07-14
CSN8362 China Southern Airlines 11 2026-07-18
CSN3048 - 11 2026-06-27
CSN3047 - 11 2026-06-27
CSN8347 China Southern Airlines 10 2026-06-05
CSN8012 - 10 2026-07-17
CSN8071 China Southern Airlines 9 2026-05-27
CSN8348 China Southern Airlines 8 2026-06-05
CSN5056 China Southern Airlines 8 2026-07-23
CSN5055 China Southern Airlines 8 2026-07-22
CSN366 - 8 2026-07-01
CSN365 - 8 2026-06-30
CSN3092 China Southern Airlines 6 2026-07-20
CSN8072 China Southern Airlines 5 2026-05-27
CSN8361 China Southern Airlines 4 2026-07-17
CSN6903 China Southern Airlines 4 2026-04-27
CSN5052 - 4 2026-07-08
CSN6910 China Southern Airlines 3 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CSN3818 HFE → CAN Jul 25, 16:45 UTCJul 25, 16:55 UTC10m
2026-07-23 CSN5056 POM → CAN Jul 23, 08:30 UTCJul 23, 08:45 UTC15m
2026-07-22 CSN5055 CAN → POM Jul 22, 17:55 UTCJul 23, 07:35 UTC13h 40m
2026-07-21 CSN5056 - Jul 21, 08:20 UTCJul 21, 08:35 UTC15m
2026-07-20 CSN5055 CAN → POM Jul 20, 17:55 UTCJul 21, 07:30 UTC13h 35m
2026-07-20 CSN3092 MNL → CAN Jul 20, 05:45 UTCJul 20, 06:30 UTC45m
2026-07-20 CSN3092 MNL → CAN Jul 20, 04:20 UTCJul 20, 04:50 UTC30m
2026-07-20 CSN3091 CAN → MNL Jul 20, 01:10 UTCJul 20, 03:00 UTC1h 50m
2026-07-18 CSN8362 DRW → CAN Jul 18, 03:20 UTCJul 18, 04:00 UTC40m
2026-07-18 CSN8362 DRW → CAN Jul 18, 01:54 UTCJul 18, 02:35 UTC40m
2026-07-17 CSN8362 DRW → CAN Jul 17, 22:15 UTCJul 17, 22:25 UTC10m
2026-07-17 CSN8361 CAN → DRW Jul 17, 14:55 UTCJul 17, 16:40 UTC1h 45m
2026-07-17 CSN8012 - Jul 17, 09:04 UTCJul 17, 09:20 UTC15m
2026-07-17 CSN8011 - Jul 17, 06:40 UTCJul 17, 07:05 UTC25m
2026-07-17 CSN8011 - Jul 17, 03:50 UTCJul 17, 03:59 UTC10m
2026-07-16 CSN3501 - Jul 16, 07:35 UTCJul 16, 07:45 UTC10m
2026-07-15 CSN8012 - Jul 15, 09:20 UTCJul 15, 09:35 UTC15m
2026-07-15 CSN8011 - Jul 15, 06:55 UTCJul 15, 07:30 UTC35m
2026-07-14 CSN398 - Jul 14, 13:05 UTCJul 14, 13:25 UTC20m
2026-07-14 CSN398 - Jul 14, 11:45 UTCJul 14, 12:15 UTC30m
2026-07-14 CSN397 - Jul 14, 08:30 UTCJul 14, 10:15 UTC1h 45m
2026-07-13 CSN3092 - Jul 13, 05:45 UTCJul 13, 06:01 UTC15m
2026-07-13 CSN3092 - Jul 13, 04:15 UTCJul 13, 04:50 UTC35m
2026-07-13 CSN3091 - Jul 13, 01:01 UTCJul 13, 03:05 UTC2h 5m
2026-07-12 CSN8012 - Jul 12, 09:05 UTCJul 12, 09:20 UTC15m
2026-07-12 CSN8011 - Jul 12, 03:50 UTCJul 12, 07:15 UTC3h 25m
2026-07-11 CSN398 - Jul 11, 11:25 UTCJul 11, 11:50 UTC25m
2026-07-11 CSN398 - Jul 11, 10:00 UTCJul 11, 10:35 UTC35m
2026-07-11 CSN397 - Jul 11, 06:45 UTCJul 11, 08:30 UTC1h 45m
2026-07-11 CSN8362 - Jul 11, 03:25 UTCJul 11, 03:55 UTC30m
2026-07-10 CSN8362 - Jul 10, 22:10 UTCJul 10, 22:20 UTC10m
2026-07-10 CSN8361 - Jul 10, 15:05 UTCJul 10, 16:45 UTC1h 40m
2026-07-10 CSN8012 - Jul 10, 09:00 UTCJul 10, 09:15 UTC15m
2026-07-10 CSN8011 - Jul 10, 06:45 UTCJul 10, 07:15 UTC30m
2026-07-10 CSN8011 - Jul 10, 04:00 UTCJul 10, 04:10 UTC10m
2026-07-08 CSN5052 - Jul 8, 21:20 UTCJul 8, 21:45 UTC25m
2026-07-08 CSN5052 - Jul 8, 20:00 UTCJul 8, 20:25 UTC25m
2026-07-08 CSN5051 - Jul 8, 16:35 UTCJul 8, 18:20 UTC1h 45m
2026-07-06 CSN3092 - Jul 6, 05:55 UTCJul 6, 06:10 UTC15m
2026-07-06 CSN3092 - Jul 6, 04:30 UTCJul 6, 05:05 UTC35m
2026-07-06 CSN3091 - Jul 6, 00:55 UTCJul 6, 02:40 UTC1h 45m
2026-07-04 CSN5056 - Jul 4, 08:45 UTCJul 4, 08:55 UTC10m
2026-07-03 CSN5055 - Jul 3, 18:35 UTCJul 4, 07:50 UTC13h 15m
2026-07-02 CSN8012 - Jul 2, 09:10 UTCJul 2, 11:50 UTC2h 40m
2026-07-02 CSN8011 - Jul 2, 05:05 UTCJul 2, 07:55 UTC2h 50m
2026-07-02 CSN8011 - Jul 2, 04:20 UTCJul 2, 04:30 UTC10m
2026-07-01 CSN398 - Jul 1, 11:35 UTCJul 1, 11:50 UTC15m
2026-07-01 CSN398 - Jul 1, 10:15 UTCJul 1, 10:45 UTC30m
2026-07-01 CSN397 - Jul 1, 07:15 UTCJul 1, 09:00 UTC1h 45m
2026-07-01 CSN366 - Jul 1, 00:20 UTCJul 1, 00:35 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-205J page for operator, model, and routing details .

Mode-S 781500 frequently asked

What is Mode-S code 781500?
781500 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-205J.
Where is Mode-S 781500 registered?
Mode-S code 781500 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781500 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 16:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781500, octal 36012400, decimal 7,869,696.
What flights does 781500 operate?
Mode-S 781500 has broadcast 20 distinct callsigns, including CSN398, CSN8011, CSN397, CSN8362, CSN3048.