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 Jul 26, 11:40 UTC
Flights observed
140
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 11:40 UTC

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
CCA1931 - 6 2026-07-20
CCA809 - 5 2026-07-04
CCA745 Air China 4 2026-07-19
CCA1801 Air China 4 2026-06-10
CCA811 - 3 2026-07-01
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
CCA1370 Air China 3 2026-07-23
CCA1369 Air China 3 2026-07-22
CCA9631 Air China 2 2026-07-20
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA1371 TSN → SZX Jul 26, 06:15 UTCJul 26, 11:40 UTC5h 26m
2026-07-25 CCA1691 PEK → JMU Jul 25, 22:45 UTCJul 25, 22:55 UTC10m
2026-07-25 CCA1288 URC → PEK Jul 25, 17:25 UTCJul 25, 17:40 UTC15m
2026-07-25 CCA1287 PEK → URC Jul 25, 11:45 UTCJul 25, 12:05 UTC20m
2026-07-25 CCA1847 PEK → NKG Jul 25, 05:55 UTCJul 25, 06:05 UTC10m
2026-07-24 CCA1562 NKG → PEK Jul 24, 10:45 UTCJul 24, 11:00 UTC15m
2026-07-24 CCA1561 PEK → NKG Jul 24, 06:35 UTCJul 24, 07:00 UTC25m
2026-07-24 CCA1131 PEK → HLD Jul 24, 00:00 UTCJul 24, 00:10 UTC10m
2026-07-23 CCA9681 CKG → CGQ Jul 23, 10:50 UTCJul 23, 11:05 UTC15m
2026-07-23 CCA1370 SYX → PEK Jul 23, 08:40 UTCJul 23, 08:50 UTC10m
2026-07-22 CCA1369 PEK → SYX Jul 22, 23:45 UTCJul 23, 00:10 UTC25m
2026-07-22 CCA1354 SYX → PEK Jul 22, 15:40 UTCJul 22, 16:00 UTC20m
2026-07-22 CCA1813 PEK → HFE Jul 22, 00:15 UTCJul 22, 00:30 UTC15m
2026-07-21 CCA812 VVO → PEK Jul 21, 10:35 UTCJul 21, 10:50 UTC15m
2026-07-20 CCA1931 - Jul 20, 18:30 UTCJul 20, 18:45 UTC15m
2026-07-20 CCA9631 PEK → NDG Jul 20, 02:35 UTCJul 20, 02:55 UTC20m
2026-07-19 CCA745 PEK → PNH Jul 19, 12:15 UTCJul 19, 19:20 UTC7h 5m
2026-07-19 CCA9632 KWE → PEK Jul 19, 10:15 UTCJul 19, 10:30 UTC15m
2026-07-19 CCA9631 PEK → NDG Jul 19, 04:10 UTCJul 19, 04:20 UTC10m
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

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 Jul 26, 11:40 UTC.
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 CCA1931, CCA809, CCA745, CCA1801, CCA811.