Apparatus

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sensors Mode-S transponder

781850

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20E1 · BOEING 737 MAX 8

Hex
781850
Octal
36014120
Decimal
7,870,544
Country
CN
Tail
B-20E1
Type
B38M
No current signal · last broadcast 1d ago
Flights observed
124
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 781850.

Country allocation

The ICAO 24-bit address 781850 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
CXA823 - 15 2026-06-30
CXA824 - 14 2026-07-03
CXA837 - 8 2026-07-04
CXA892 - 7 2026-06-24
CXA868 - 7 2026-07-05
CXA867 - 7 2026-07-05
CXA847 Xiamen Airlines 7 2026-06-09
CXA848 Xiamen Airlines 6 2026-06-01
CXA838 - 6 2026-07-04
CXA8882 Xiamen Airlines 4 2026-05-27
CXA8706 - 4 2026-06-27
CXA8372 Xiamen Airlines 4 2026-05-26
CXA8371 Xiamen Airlines 4 2026-05-27
CXA8881 Xiamen Airlines 3 2026-05-27
CXA8429 - 3 2026-07-16
CXA8716 - 2 2026-07-02
CXA8705 - 2 2026-06-23
CXA855 - 2 2026-07-13
CXA891 Xiamen Airlines 1 2026-05-04
CXA8715 Xiamen Airlines 1 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 CXA8429 - Jul 16, 00:15 UTCJul 16, 14:10 UTC13h 55m
2026-07-14 CXA856 - Jul 14, 00:30 UTCJul 14, 02:00 UTC1h 30m
2026-07-13 CXA855 - Jul 13, 17:15 UTCJul 13, 17:30 UTC15m
2026-07-13 CXA855 - Jul 13, 13:15 UTCJul 13, 15:50 UTC2h 35m
2026-07-12 CXA8480 - Jul 12, 06:01 UTCJul 12, 14:10 UTC8h 10m
2026-07-09 CXA8429 - Jul 9, 14:15 UTCJul 10, 06:05 UTC15h 50m
2026-07-09 CXA8429 - Jul 9, 05:50 UTCJul 10, 01:15 UTC19h 25m
2026-07-07 CXA8405 - Jul 7, 09:00 UTCJul 8, 01:40 UTC16h 40m
2026-07-06 CXA8415 - Jul 6, 04:55 UTCJul 6, 05:35 UTC40m
2026-07-05 CXA868 - Jul 5, 08:05 UTCJul 6, 05:35 UTC21h 30m
2026-07-05 CXA868 - Jul 5, 07:00 UTCJul 5, 08:30 UTC1h 30m
2026-07-05 CXA867 - Jul 5, 05:00 UTCJul 5, 05:15 UTC15m
2026-07-04 CXA838 - Jul 4, 16:45 UTCJul 5, 03:25 UTC10h 40m
2026-07-04 CXA837 - Jul 4, 15:00 UTCJul 4, 15:10 UTC10m
2026-07-04 CXA837 - Jul 4, 07:45 UTCJul 4, 13:25 UTC5h 40m
2026-07-03 CXA8646 - Jul 3, 12:05 UTCJul 4, 07:50 UTC19h 45m
2026-07-03 CXA8524 - Jul 3, 11:40 UTCJul 4, 07:50 UTC20h 10m
2026-07-03 CXA824 - Jul 3, 00:45 UTCJul 3, 12:10 UTC11h 25m
2026-07-02 CXA8716 - Jul 2, 02:55 UTCJul 2, 15:35 UTC12h 40m
2026-07-01 CXA8716 - Jul 1, 02:55 UTCJul 1, 15:30 UTC12h 35m
2026-06-30 CXA823 - Jun 30, 15:15 UTCJun 30, 15:35 UTC20m
2026-06-30 CXA823 - Jun 30, 12:10 UTCJun 30, 12:30 UTC20m
2026-06-29 CXA868 - Jun 29, 06:59 UTCJun 29, 08:39 UTC1h 40m
2026-06-29 CXA867 - Jun 29, 05:00 UTCJun 29, 05:15 UTC15m
2026-06-29 CXA867 - Jun 29, 02:50 UTCJun 29, 03:34 UTC45m
2026-06-27 CXA8706 - Jun 27, 11:20 UTCJun 27, 11:35 UTC15m
2026-06-27 CXA824 - Jun 27, 00:14 UTCJun 27, 06:44 UTC6h 30m
2026-06-26 CXA823 - Jun 26, 15:20 UTCJun 26, 15:45 UTC25m
2026-06-24 CXA892 - Jun 24, 12:25 UTCJun 25, 07:00 UTC18h 35m
2026-06-24 CXA892 - Jun 24, 10:30 UTCJun 25, 07:00 UTC20h 30m
2026-06-23 CXA8706 - Jun 23, 11:04 UTCJun 23, 11:14 UTC10m
2026-06-23 CXA8705 - Jun 23, 09:24 UTCJun 23, 09:40 UTC15m
2026-06-23 CXA824 - Jun 23, 00:19 UTCJun 23, 06:34 UTC6h 15m
2026-06-22 CXA823 - Jun 22, 15:29 UTCJun 22, 15:54 UTC25m
2026-06-21 - - Jun 21, 23:10 UTCJun 21, 23:34 UTC25m
2026-06-21 CXA8426 - Jun 21, 00:25 UTCJun 21, 13:59 UTC13h 35m
2026-06-20 CXA8406 - Jun 20, 06:05 UTCJun 20, 15:29 UTC9h 25m
2026-06-15 CXA824 - Jun 15, 00:05 UTCJun 15, 06:49 UTC6h 45m
2026-06-14 CXA823 - Jun 14, 12:25 UTCJun 14, 15:35 UTC3h 10m
2026-06-13 CXA864 SIN → HGH Jun 13, 13:10 UTCJun 13, 15:30 UTC2h 20m
2026-06-12 CXA863 HGH → SIN Jun 12, 23:45 UTCJun 13, 11:30 UTC11h 44m
2026-06-12 CXA824 - Jun 12, 00:10 UTCJun 13, 00:00 UTC23h 51m
2026-06-11 CXA823 XMN → KUL Jun 11, 12:15 UTCJun 11, 15:35 UTC3h 20m
2026-06-11 CXA824 KUL → XMN Jun 11, 00:20 UTCJun 11, 00:45 UTC25m
2026-06-10 CXA823 XMN → KUL Jun 10, 12:35 UTCJun 10, 16:05 UTC3h 30m
2026-06-10 CXA824 KUL → XMN Jun 10, 00:30 UTCJun 10, 04:05 UTC3h 35m
2026-06-09 CXA823 XMN → KUL Jun 9, 07:20 UTCJun 9, 17:35 UTC10h 15m
2026-06-09 CXA847 XMN → KUL Jun 9, 01:40 UTCJun 9, 05:20 UTC3h 40m
2026-06-08 CXA8706 PEN → XMN Jun 8, 11:35 UTCJun 8, 11:45 UTC10m
2026-06-08 CXA824 KUL → XMN Jun 8, 00:10 UTCJun 8, 07:15 UTC7h 5m

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-20E1 page for operator, model, and routing details .

Mode-S 781850 frequently asked

What is Mode-S code 781850?
781850 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20E1.
Where is Mode-S 781850 registered?
Mode-S code 781850 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781850 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781850, octal 36014120, decimal 7,870,544.
What flights does 781850 operate?
Mode-S 781850 has broadcast 20 distinct callsigns, including CXA823, CXA824, CXA837, CXA892, CXA868.