Apparatus

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sensors Mode-S transponder

781C3F

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-325N · AIRBUS A-321neo

Hex
781C3F
Octal
36016077
Decimal
7,871,551
Country
CN
Tail
B-325N
Type
A21N
No current signal · last broadcast 4h ago
Flights observed
121
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 781C3F.

Country allocation

The ICAO 24-bit address 781C3F 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
CCA809 - 5 2026-07-04
CCA1931 - 5 2026-06-30
CCA1801 Air China 4 2026-06-10
CCA811 - 3 2026-07-01
CCA745 Air China 3 2026-06-11
CCA742 Air China 3 2026-06-03
CCA1732 - 3 2026-07-18
CCA1712 - 3 2026-07-11
CCA1623 - 3 2026-07-05
CCA1539 - 3 2026-07-06
CCA741 Air China 2 2026-06-03
CCA4314 Air China 2 2026-05-31
CCA1925 - 2 2026-07-13
CCA1845 Air China 2 2026-05-19
CCA1843 - 2 2026-07-07
CCA1716 Air China 2 2026-05-19
CCA1710 - 2 2026-07-16
CCA1693 Air China 2 2026-05-28
CCA1505 - 2 2026-06-24
CCA1370 - 2 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 CCA1732 - Jul 18, 15:20 UTCJul 18, 15:30 UTC10m
2026-07-17 CCA1434 - Jul 17, 08:20 UTCJul 17, 08:35 UTC15m
2026-07-17 CCA1433 - Jul 17, 01:49 UTCJul 17, 02:15 UTC25m
2026-07-16 CCA1710 - Jul 16, 02:45 UTCJul 16, 02:55 UTC10m
2026-07-15 CCA1732 - Jul 15, 14:55 UTCJul 15, 15:05 UTC10m
2026-07-15 CCA1914 - Jul 15, 11:50 UTCJul 15, 12:05 UTC15m
2026-07-15 CCA1913 - Jul 15, 08:10 UTCJul 15, 08:25 UTC15m
2026-07-15 CCA1879 - Jul 15, 00:35 UTCJul 15, 00:45 UTC10m
2026-07-13 CCA1925 - Jul 13, 23:45 UTCJul 14, 00:05 UTC20m
2026-07-13 CCA110 - Jul 13, 10:15 UTCJul 13, 10:30 UTC15m
2026-07-13 CCA109 - Jul 13, 04:55 UTCJul 13, 08:01 UTC3h 5m
2026-07-12 CCA1807 - Jul 12, 10:10 UTCJul 12, 10:25 UTC15m
2026-07-12 CCA1361 - Jul 12, 00:25 UTCJul 12, 00:50 UTC25m
2026-07-11 CCA1712 - Jul 11, 03:50 UTCJul 11, 04:05 UTC15m
2026-07-10 CCA1581 - Jul 10, 13:25 UTCJul 10, 13:40 UTC15m
2026-07-10 CCA1311 - Jul 10, 02:25 UTCJul 10, 02:50 UTC25m
2026-07-09 CCA1353 - Jul 9, 06:45 UTCJul 9, 07:00 UTC15m
2026-07-08 CCA1131 - Jul 8, 23:45 UTCJul 9, 00:00 UTC15m
2026-07-08 CCA1372 - Jul 8, 10:25 UTCJul 8, 10:50 UTC25m
2026-07-08 CCA1371 - Jul 8, 04:55 UTCJul 8, 07:55 UTC3h 0m
2026-07-07 CCA1349 - Jul 7, 20:55 UTCJul 7, 21:10 UTC15m
2026-07-07 CCA1843 - Jul 7, 10:45 UTCJul 7, 11:05 UTC20m
2026-07-06 CCA1539 - Jul 6, 13:00 UTCJul 6, 13:10 UTC10m
2026-07-05 CCA1349 - Jul 5, 14:00 UTCJul 5, 14:30 UTC30m
2026-07-05 CCA1623 - Jul 5, 04:25 UTCJul 5, 04:35 UTC10m
2026-07-04 CCA1539 - Jul 4, 11:35 UTCJul 4, 11:55 UTC20m
2026-07-04 CCA809 - Jul 4, 03:20 UTCJul 4, 03:30 UTC10m
2026-07-03 CCA1202 - Jul 3, 11:15 UTCJul 3, 11:35 UTC20m
2026-07-03 CCA1201 - Jul 3, 06:25 UTCJul 3, 06:35 UTC10m
2026-07-01 CCA1915 - Jul 1, 13:35 UTCJul 1, 14:05 UTC30m
2026-07-01 CCA811 - Jul 1, 05:40 UTCJul 1, 05:50 UTC10m
2026-06-30 CCA1931 - Jun 30, 14:15 UTCJun 30, 14:35 UTC20m
2026-06-30 CCA1224 - Jun 30, 09:00 UTCJun 30, 09:15 UTC15m
2026-06-30 CCA1223 - Jun 30, 04:10 UTCJun 30, 04:30 UTC20m
2026-06-29 CCA1539 - Jun 29, 11:45 UTCJun 29, 12:00 UTC15m
2026-06-29 CCA809 - Jun 29, 03:29 UTCJun 29, 03:39 UTC10m
2026-06-28 CCA1607 PEK → HRB Jun 28, 07:09 UTCJun 28, 07:20 UTC10m
2026-06-27 CCA1370 - Jun 27, 08:25 UTCJun 27, 08:39 UTC15m
2026-06-27 CCA1370 - Jun 27, 05:25 UTCJun 27, 05:39 UTC15m
2026-06-26 CCA1369 PEK → SYX Jun 26, 23:44 UTCJun 27, 02:35 UTC2h 50m
2026-06-26 CCA1647 - Jun 26, 12:29 UTCJun 26, 12:39 UTC10m
2026-06-26 CCA809 - Jun 26, 03:24 UTCJun 26, 03:34 UTC10m
2026-06-25 CCA1821 - Jun 25, 13:55 UTCJun 25, 14:09 UTC15m
2026-06-25 CCA811 - Jun 25, 05:15 UTCJun 25, 05:25 UTC10m
2026-06-24 CCA1691 PEK → JMU Jun 24, 22:35 UTCJun 24, 22:45 UTC10m
2026-06-24 CCA1505 - Jun 24, 02:05 UTCJun 24, 02:15 UTC10m
2026-06-17 CCA1919 PEK → HAK Jun 17, 12:25 UTCJun 17, 12:35 UTC10m
2026-06-12 CCA1635 PEK → SHE Jun 12, 11:15 UTCJun 12, 11:25 UTC10m
2026-06-12 CCA809 PEK → VVO Jun 12, 03:10 UTCJun 12, 03:20 UTC10m
2026-06-11 CCA746 PNH → PEK Jun 11, 21:40 UTCJun 11, 21:55 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-325N page for operator, model, and routing details .

Mode-S 781C3F frequently asked

What is Mode-S code 781C3F?
781C3F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-325N.
Where is Mode-S 781C3F registered?
Mode-S code 781C3F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781C3F broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781C3F, octal 36016077, decimal 7,871,551.
What flights does 781C3F operate?
Mode-S 781C3F has broadcast 20 distinct callsigns, including CCA809, CCA1931, CCA1801, CCA811, CCA745.