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 3h ago
Flights observed
55
Distinct callsigns
20
Country
CN
Last broadcast
3h 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
CCA1931 Air China 4 2026-06-03
CCA742 Air China 3 2026-06-03
CCA741 Air China 2 2026-06-03
CCA4314 Air China 2 2026-05-31
CCA1845 Air China 2 2026-05-19
CCA1801 Air China 2 2026-05-24
CCA1716 Air China 2 2026-05-19
CCA1693 Air China 2 2026-05-28
CCA811 Air China 1 2026-05-09
CCA745 Air China 1 2026-04-18
CCA4326 Air China 1 2026-04-23
CCA4325 Air China 1 2026-04-23
CCA4315 Air China 1 2026-06-01
CCA4313 Air China 1 2026-04-22
CCA4184 Air China 1 2026-04-22
CCA1937 Air China 1 2026-04-20
CCA1849 Air China 1 2026-05-25
CCA1843 Air China 1 2026-05-18
CCA1811 Air China 1 2026-04-24
CCA1732 Air China 1 2026-04-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-03 CCA1931 PEK → NNG Jun 3, 12:15 UTCJun 3, 12:40 UTC25m
2026-06-03 CCA742 HAN → PEK Jun 3, 07:00 UTCJun 3, 07:25 UTC25m
2026-06-03 CCA741 PEK → HAN Jun 3, 01:10 UTCJun 3, 04:35 UTC3h 25m
2026-06-01 CCA4315 CTU → HAK Jun 1, 08:00 UTCJun 1, 08:15 UTC15m
2026-05-31 CCA4314 SZX → CTU May 31, 09:30 UTCMay 31, 09:40 UTC10m
2026-05-30 CCA1374 CSX → PEK May 30, 10:40 UTCMay 30, 10:50 UTC10m
2026-05-30 CCA1373 PEK → CSX May 30, 05:25 UTCMay 30, 05:40 UTC15m
2026-05-29 CCA1247 PEK → XIY May 29, 13:00 UTCMay 29, 13:15 UTC15m
2026-05-29 CCA1286 - May 29, 10:10 UTCMay 29, 10:25 UTC15m
2026-05-29 CCA1285 - May 29, 03:55 UTCMay 29, 04:10 UTC15m
2026-05-28 CCA1693 PEK → JMU May 28, 12:35 UTCMay 28, 12:45 UTC10m
2026-05-28 CCA1649 PEK → CGQ May 28, 05:20 UTCMay 28, 05:30 UTC10m
2026-05-27 CCA1712 PEK → HGH May 27, 03:50 UTCMay 27, 03:59 UTC10m
2026-05-26 CCA1726 CAN → HGH May 26, 10:50 UTCMay 26, 11:00 UTC10m
2026-05-25 CCA1369 PEK → SYX May 25, 23:49 UTCMay 26, 00:14 UTC25m
2026-05-25 CCA1849 PEK → NGB May 25, 12:00 UTCMay 25, 12:10 UTC10m
2026-05-24 CCA1801 PEK → XMN May 24, 15:55 UTCMay 24, 16:15 UTC20m
2026-05-23 CCA1342 SZX → PEK May 23, 10:05 UTCMay 23, 10:15 UTC10m
2026-05-23 CCA1341 PEK → SZX May 23, 07:45 UTCMay 23, 07:55 UTC10m
2026-05-21 CCA1931 PEK → NNG May 21, 11:55 UTCMay 21, 12:05 UTC10m
2026-05-21 CCA742 HAN → PEK May 21, 09:40 UTCMay 21, 09:50 UTC10m
2026-05-21 CCA741 PEK → HAN May 21, 01:10 UTCMay 21, 01:30 UTC20m
2026-05-20 CCA1623 PEK → HRB May 20, 04:20 UTCMay 20, 04:30 UTC10m
2026-05-19 CCA1845 PEK → HFE May 19, 12:40 UTCMay 19, 12:55 UTC15m
2026-05-19 CCA1716 PEK → HGH May 19, 06:00 UTCMay 19, 06:15 UTC15m
2026-05-18 CCA1801 PEK → XMN May 18, 12:25 UTCMay 18, 12:35 UTC10m
2026-05-18 CCA1843 PEK → HFE May 18, 05:30 UTCMay 18, 05:45 UTC15m
2026-05-18 CCA1206 XIY → PEK May 18, 01:45 UTCMay 18, 02:15 UTC30m
2026-05-17 CCA1205 PEK → XIY May 17, 11:55 UTCMay 17, 12:20 UTC25m
2026-05-09 CCA1525 PEK → TAO May 9, 12:35 UTCMay 9, 12:45 UTC10m
2026-05-09 CCA811 PEK → VVO May 9, 05:10 UTCMay 9, 05:20 UTC10m
2026-05-08 CCA1931 PEK → NNG May 8, 11:55 UTCMay 8, 12:10 UTC15m
2026-05-08 CCA1554 - May 8, 04:04 UTCMay 8, 04:14 UTC10m
2026-05-07 CCA1693 PEK → JMU May 7, 12:25 UTCMay 7, 12:35 UTC10m
2026-05-07 CCA1511 PEK → KHN May 7, 04:40 UTCMay 7, 04:50 UTC10m
2026-05-06 CCA1845 PEK → HFE May 6, 12:45 UTCMay 6, 12:55 UTC10m
2026-05-06 CCA1716 PEK → HGH May 6, 05:45 UTCMay 6, 06:05 UTC20m
2026-05-05 CCA1931 PEK → NNG May 5, 12:10 UTCMay 5, 12:20 UTC10m
2026-04-27 - - Apr 27, 00:50 UTCApr 27, 01:05 UTC15m
2026-04-26 CCA742 HAN → PEK Apr 26, 09:50 UTCApr 26, 10:05 UTC15m
2026-04-25 CCA1425 PEK → CTU Apr 25, 10:10 UTCApr 25, 10:25 UTC15m
2026-04-24 CCA1811 PEK → XMN Apr 24, 10:00 UTCApr 24, 10:15 UTC15m
2026-04-24 CCA1226 XIY → PEK Apr 24, 05:25 UTCApr 24, 05:40 UTC15m
2026-04-24 CCA1225 PEK → XIY Apr 24, 00:05 UTCApr 24, 00:30 UTC25m
2026-04-23 CCA4326 SZX → CTU Apr 23, 07:10 UTCApr 23, 07:25 UTC15m
2026-04-23 CCA4325 CTU → SZX Apr 23, 03:10 UTCApr 23, 03:25 UTC15m
2026-04-22 CCA4314 SZX → CTU Apr 22, 09:45 UTCApr 22, 09:55 UTC10m
2026-04-22 CCA4313 CTU → SZX Apr 22, 07:35 UTCApr 22, 07:50 UTC15m
2026-04-22 CCA4184 PEK → CTU Apr 22, 01:00 UTCApr 22, 01:25 UTC25m
2026-04-21 CCA1345 PEK → SYX Apr 21, 08:35 UTCApr 21, 08:50 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 3h 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 CCA1931, CCA742, CCA741, CCA4314, CCA1845.