Apparatus

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sensors Mode-S transponder

781550

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-303K · AIRBUS A-321neo

Hex
781550
Octal
36012520
Decimal
7,869,776
Country
CN
Tail
B-303K
Type
A21N
Broadcasting now · callsign CSN6966 · 33,150 ft
Flights observed
127
Distinct callsigns
8
Country
CN
Last broadcast
1d ago

Current position

781550 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 781550 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 8 distinct

Callsign Airline Flights Last seen
CSN686 - 44 2026-07-13
CSN685 - 41 2026-07-13
CSN629 - 17 2026-07-05
CSN630 - 13 2026-07-05
CSN6966 - 9 2026-07-12
CZ686 - 1 2026-07-11
CSN676 - 1 2026-04-23
CSN675 - 1 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSN686 - Jul 13, 02:30 UTCJul 13, 02:55 UTC25m
2026-07-13 CSN685 - Jul 13, 00:45 UTCJul 13, 01:05 UTC20m
2026-07-12 CSN6966 - Jul 12, 14:10 UTCJul 12, 14:35 UTC25m
2026-07-12 CSN686 - Jul 12, 02:45 UTCJul 12, 03:05 UTC20m
2026-07-12 CSN685 - Jul 12, 00:40 UTCJul 12, 00:55 UTC15m
2026-07-11 CZ686 - Jul 11, 02:35 UTCJul 11, 02:55 UTC20m
2026-07-11 CSN685 - Jul 11, 00:20 UTCJul 11, 00:40 UTC20m
2026-07-10 CSN6966 - Jul 10, 06:00 UTCJul 10, 15:15 UTC9h 15m
2026-07-10 CSN686 - Jul 10, 02:40 UTCJul 10, 03:05 UTC25m
2026-07-10 CSN685 - Jul 10, 00:40 UTCJul 10, 00:55 UTC15m
2026-07-09 CSN6966 - Jul 9, 14:20 UTCJul 9, 14:40 UTC20m
2026-07-09 CSN686 - Jul 9, 02:45 UTCJul 9, 03:05 UTC20m
2026-07-09 CSN685 - Jul 9, 00:20 UTCJul 9, 00:40 UTC20m
2026-07-08 CSN686 - Jul 8, 02:40 UTCJul 8, 14:40 UTC12h 0m
2026-07-08 CSN685 - Jul 8, 00:40 UTCJul 8, 00:55 UTC15m
2026-07-07 CSN686 - Jul 7, 02:35 UTCJul 7, 14:40 UTC12h 5m
2026-07-07 CSN685 - Jul 7, 00:30 UTCJul 7, 00:50 UTC20m
2026-07-06 CSN6966 - Jul 6, 14:20 UTCJul 6, 14:45 UTC25m
2026-07-05 CSN630 - Jul 5, 04:40 UTCJul 5, 06:50 UTC2h 10m
2026-07-05 CSN629 - Jul 5, 00:30 UTCJul 5, 02:20 UTC1h 50m
2026-07-04 CSN686 - Jul 4, 02:45 UTCJul 4, 03:05 UTC20m
2026-07-04 CSN685 - Jul 4, 00:30 UTCJul 4, 00:50 UTC20m
2026-07-03 CSN686 - Jul 3, 02:35 UTCJul 3, 02:55 UTC20m
2026-07-03 CSN685 - Jul 3, 00:35 UTCJul 3, 00:50 UTC15m
2026-07-02 CSN6966 - Jul 2, 02:35 UTCJul 2, 14:55 UTC12h 20m
2026-07-02 CSN685 - Jul 2, 00:20 UTCJul 2, 00:40 UTC20m
2026-07-01 CSN6966 - Jul 1, 02:45 UTCJul 1, 15:05 UTC12h 20m
2026-07-01 CSN685 - Jul 1, 00:30 UTCJul 1, 00:45 UTC15m
2026-06-30 CSN686 - Jun 30, 02:30 UTCJun 30, 02:45 UTC15m
2026-06-30 CSN685 - Jun 30, 00:30 UTCJun 30, 00:45 UTC15m
2026-06-29 CSN686 - Jun 29, 02:39 UTCJun 29, 02:59 UTC20m
2026-06-29 CSN685 - Jun 29, 00:20 UTCJun 29, 00:44 UTC25m
2026-06-28 CSN686 - Jun 28, 02:44 UTCJun 28, 03:05 UTC20m
2026-06-28 CSN685 - Jun 28, 00:30 UTCJun 28, 00:50 UTC20m
2026-06-27 CSN686 - Jun 27, 02:35 UTCJun 27, 02:50 UTC15m
2026-06-27 CSN685 - Jun 27, 00:25 UTCJun 27, 00:50 UTC25m
2026-06-26 CSN6966 URC → XIY Jun 26, 02:44 UTCJun 26, 15:05 UTC12h 20m
2026-06-26 CSN685 - Jun 26, 00:30 UTCJun 26, 00:50 UTC20m
2026-06-25 CSN686 - Jun 25, 02:59 UTCJun 25, 03:24 UTC25m
2026-06-25 CSN685 - Jun 25, 00:29 UTCJun 25, 00:49 UTC20m
2026-06-24 CSN6966 URC → XIY Jun 24, 14:45 UTCJun 24, 15:05 UTC20m
2026-06-24 CSN686 - Jun 24, 02:54 UTCJun 24, 03:15 UTC20m
2026-06-24 CSN685 - Jun 24, 00:30 UTCJun 24, 00:44 UTC15m
2026-06-23 CSN686 - Jun 23, 02:34 UTCJun 23, 02:55 UTC20m
2026-06-23 CSN685 - Jun 23, 00:24 UTCJun 23, 00:45 UTC20m
2026-06-22 CSN6966 URC → XIY Jun 22, 14:14 UTCJun 22, 14:34 UTC20m
2026-06-21 CSN630 - Jun 21, 04:44 UTCJun 21, 06:55 UTC2h 10m
2026-06-21 CSN629 - Jun 21, 00:40 UTCJun 21, 02:40 UTC2h 0m
2026-06-19 CSN630 - Jun 19, 04:44 UTCJun 19, 06:39 UTC1h 55m
2026-06-19 CSN629 - Jun 19, 00:34 UTCJun 19, 02:24 UTC1h 50m

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-303K page for operator, model, and routing details .

Mode-S 781550 frequently asked

What is Mode-S code 781550?
781550 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-303K.
Where is Mode-S 781550 registered?
Mode-S code 781550 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781550 broadcasting right now?
Yes. Mode-S 781550 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781550, octal 36012520, decimal 7,869,776.
What flights does 781550 operate?
Mode-S 781550 has broadcast 8 distinct callsigns, including CSN686, CSN685, CSN629, CSN630, CSN6966.