Apparatus

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sensors Mode-S transponder

781F4B

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32E5 · AIRBUS A-321neo

Hex
781F4B
Octal
36017513
Decimal
7,872,331
Country
CN
Tail
B-32E5
Type
A21N
No current signal · last broadcast 2d ago
Flights observed
84
Distinct callsigns
20
Country
CN
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 781F4B.

Country allocation

The ICAO 24-bit address 781F4B 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
CXA8350 Xiamen Airlines 8 2026-06-09
CXA887 - 7 2026-06-21
CXA854 - 6 2026-07-11
CXA8349 Xiamen Airlines 6 2026-06-01
CXA834 - 6 2026-06-21
CXA833 - 6 2026-06-21
CXA853 - 5 2026-07-11
CXA888 - 4 2026-06-15
CXA8812 - 4 2026-06-13
CXA8393 Xiamen Airlines 4 2026-06-19
CXA863 Xiamen Airlines 3 2026-06-17
CXA8387 Xiamen Airlines 3 2026-06-13
CXA8361 - 3 2026-07-09
CXA864 Xiamen Airlines 2 2026-06-17
CXA8536 - 2 2026-05-24
CXA8535 - 2 2026-06-06
CXA8394 Xiamen Airlines 2 2026-06-04
CXA8816 - 1 2026-07-04
CXA8596 - 1 2026-05-09
CXA852 Xiamen Airlines 1 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 CXA854 - Jul 11, 07:45 UTCJul 11, 23:35 UTC15h 50m
2026-07-11 CXA854 - Jul 11, 05:50 UTCJul 11, 06:05 UTC15m
2026-07-11 CXA853 - Jul 11, 01:55 UTCJul 11, 04:25 UTC2h 30m
2026-07-09 CXA8080 - Jul 9, 14:10 UTCJul 10, 06:55 UTC16h 45m
2026-07-09 CXA8361 - Jul 9, 11:00 UTCJul 10, 06:55 UTC19h 55m
2026-07-09 CXA854 - Jul 9, 05:30 UTCJul 9, 07:50 UTC2h 20m
2026-07-08 CXA853 - Jul 8, 10:25 UTCJul 9, 04:20 UTC17h 55m
2026-07-08 CXA854 - Jul 8, 05:30 UTCJul 8, 07:55 UTC2h 25m
2026-07-08 CXA853 - Jul 8, 01:35 UTCJul 8, 04:15 UTC2h 40m
2026-07-04 CXA8816 - Jul 4, 13:05 UTCJul 4, 13:40 UTC35m
2026-07-03 CXA854 - Jul 3, 06:00 UTCJul 3, 08:20 UTC2h 20m
2026-07-02 CXA853 - Jul 2, 14:50 UTCJul 3, 04:10 UTC13h 20m
2026-07-02 CXA8361 - Jul 2, 10:40 UTCJul 2, 11:25 UTC45m
2026-07-02 CXA854 - Jul 2, 05:35 UTCJul 2, 07:55 UTC2h 20m
2026-07-02 CXA853 - Jul 2, 01:40 UTCJul 2, 04:05 UTC2h 25m
2026-06-30 CXA8361 - Jun 30, 10:30 UTCJun 30, 14:00 UTC3h 30m
2026-06-25 CXA8319 - Jun 25, 02:05 UTCJun 25, 03:10 UTC1h 5m
2026-06-21 CXA834 - Jun 21, 10:49 UTCJun 21, 13:09 UTC2h 20m
2026-06-21 CXA833 TPE → BKK Jun 21, 03:34 UTCJun 21, 09:15 UTC5h 40m
2026-06-21 CXA887 - Jun 21, 00:40 UTCJun 21, 01:39 UTC1h 0m
2026-06-19 CXA8393 PKX → SYX Jun 19, 05:00 UTCJun 20, 02:24 UTC21h 25m
2026-06-19 CXA8393 PKX → SYX Jun 19, 02:09 UTCJun 19, 23:44 UTC21h 35m
2026-06-17 CXA864 SIN → HGH Jun 17, 13:15 UTCJun 18, 07:25 UTC18h 10m
2026-06-17 CXA863 HGH → SIN Jun 17, 09:40 UTCJun 17, 11:55 UTC2h 15m
2026-06-16 CXA863 HGH → SIN Jun 16, 12:55 UTCJun 17, 11:55 UTC23h 1m
2026-06-16 CXA834 - Jun 16, 10:55 UTCJun 17, 10:35 UTC23h 41m
2026-06-16 CXA833 - Jun 16, 03:35 UTCJun 16, 09:30 UTC5h 55m
2026-06-15 CXA834 - Jun 15, 11:39 UTCJun 16, 02:00 UTC14h 20m
2026-06-15 CXA833 - Jun 15, 07:35 UTCJun 15, 10:24 UTC2h 50m
2026-06-15 CXA888 - Jun 15, 04:30 UTCJun 15, 05:00 UTC30m
2026-06-15 CXA887 - Jun 15, 01:35 UTCJun 15, 02:30 UTC55m
2026-06-14 CXA887 - Jun 14, 05:35 UTCJun 15, 02:30 UTC20h 55m
2026-06-13 CXA8812 - Jun 13, 11:10 UTCJun 14, 06:10 UTC19h 0m
2026-06-13 CXA8812 - Jun 13, 10:30 UTCJun 14, 06:10 UTC19h 40m
2026-06-13 CXA8387 HGH → SZX Jun 13, 08:55 UTCJun 13, 09:10 UTC15m
2026-06-13 CXA8387 HGH → SZX Jun 13, 05:20 UTCJun 13, 06:00 UTC40m
2026-06-11 CXA888 TPE → XMN Jun 11, 04:00 UTCJun 11, 04:30 UTC30m
2026-06-10 CXA887 XMN → TPE Jun 10, 09:50 UTCJun 11, 01:55 UTC16h 5m
2026-06-09 CXA8393 PKX → SYX Jun 9, 23:40 UTCJun 10, 02:30 UTC2h 50m
2026-06-09 CXA8350 SZX → PKX Jun 9, 14:05 UTCJun 9, 14:15 UTC10m
2026-06-07 CXA864 SIN → HGH Jun 7, 13:00 UTCJun 8, 07:20 UTC18h 20m
2026-06-07 CXA863 HGH → SIN Jun 7, 03:35 UTCJun 7, 11:35 UTC8h 0m
2026-06-07 CXA887 XMN → TPE Jun 7, 01:15 UTCJun 7, 01:50 UTC35m
2026-06-06 CXA8535 - Jun 6, 02:25 UTCJun 6, 02:35 UTC10m
2026-06-05 CXA8535 - Jun 5, 05:05 UTCJun 6, 02:35 UTC21h 30m
2026-06-04 CXA8394 SYX → PKX Jun 4, 07:35 UTCJun 4, 08:00 UTC25m
2026-06-04 CXA8393 PKX → SYX Jun 4, 02:20 UTCJun 4, 05:15 UTC2h 55m
2026-06-03 CXA8339 PKX → CAN Jun 3, 10:25 UTCJun 3, 10:45 UTC20m
2026-06-02 CXA8350 SZX → PKX Jun 2, 13:50 UTCJun 2, 14:00 UTC10m
2026-06-01 CXA8350 SZX → PKX Jun 1, 14:20 UTCJun 1, 14:30 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-32E5 page for operator, model, and routing details .

Mode-S 781F4B frequently asked

What is Mode-S code 781F4B?
781F4B is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32E5.
Where is Mode-S 781F4B registered?
Mode-S code 781F4B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F4B broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F4B, octal 36017513, decimal 7,872,331.
What flights does 781F4B operate?
Mode-S 781F4B has broadcast 20 distinct callsigns, including CXA8350, CXA887, CXA854, CXA8349, CXA834.