Apparatus

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sensors Mode-S transponder

781C3E

ICAO 24-bit transponder address · allocated to China

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

Hex
781C3E
Octal
36016076
Decimal
7,871,550
Country
CN
Tail
B-325M
Type
A21N
No current signal · last broadcast 15h ago
Flights observed
69
Distinct callsigns
20
Country
CN
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 781C3E.

Country allocation

The ICAO 24-bit address 781C3E 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
CCA741 Air China 5 2026-05-30
CCA1738 Air China 5 2026-05-17
CCA1737 Air China 5 2026-05-17
CCA742 Air China 3 2026-05-30
CCA1635 Air China 3 2026-05-17
CCA1202 Air China 3 2026-06-02
CCA809 Air China 2 2026-05-03
CCA1931 Air China 2 2026-05-30
CCA1919 Air China 2 2026-05-21
CCA1734 Air China 2 2026-05-13
CCA1733 Air China 2 2026-05-13
CCA1372 Air China 2 2026-05-29
CCA1303 Air China 2 2026-05-07
CCA1201 Air China 2 2026-05-27
CCA1915 Air China 1 2026-04-20
CCA1914 Air China 1 2026-05-20
CCA1913 Air China 1 2026-05-20
CCA1847 Air China 1 2026-04-23
CCA1821 Air China 1 2026-05-02
CCA1809 Air China 1 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 CCA1202 XIY → PEK Jun 2, 10:40 UTCJun 2, 11:20 UTC40m
2026-05-30 CCA1931 PEK → NNG May 30, 12:10 UTCMay 30, 12:20 UTC10m
2026-05-30 CCA742 HAN → PEK May 30, 09:35 UTCMay 30, 09:45 UTC10m
2026-05-30 CCA742 HAN → PEK May 30, 06:35 UTCMay 30, 07:00 UTC25m
2026-05-30 CCA741 PEK → HAN May 30, 03:55 UTCMay 30, 04:10 UTC15m
2026-05-29 CCA1372 SZX → TSN May 29, 13:30 UTCMay 29, 13:40 UTC10m
2026-05-29 CCA1372 SZX → TSN May 29, 10:50 UTCMay 29, 11:00 UTC10m
2026-05-29 CCA1371 TSN → SZX May 29, 04:55 UTCMay 29, 08:00 UTC3h 5m
2026-05-28 CCA1807 PEK → FOC May 28, 10:15 UTCMay 28, 10:25 UTC10m
2026-05-28 CCA1433 PEK → KWE May 28, 01:40 UTCMay 28, 02:00 UTC20m
2026-05-27 CCA1202 XIY → PEK May 27, 10:30 UTCMay 27, 11:00 UTC30m
2026-05-27 CCA1201 PEK → XIY May 27, 06:29 UTCMay 27, 06:44 UTC15m
2026-05-26 CCA741 PEK → HAN May 26, 01:10 UTCMay 26, 01:34 UTC25m
2026-05-21 CCA1919 PEK → HAK May 21, 09:45 UTCMay 21, 10:00 UTC15m
2026-05-20 CCA1914 CGO → PEK May 20, 10:30 UTCMay 20, 10:45 UTC15m
2026-05-20 CCA1913 PEK → CGO May 20, 07:15 UTCMay 20, 07:25 UTC10m
2026-05-20 CCA1643 PEK → HRB May 20, 00:30 UTCMay 20, 00:40 UTC10m
2026-05-19 CCA1212 URC → PEK May 19, 13:15 UTCMay 19, 13:40 UTC25m
2026-05-19 CCA1211 PEK → URC May 19, 04:45 UTCMay 19, 05:00 UTC15m
2026-05-18 CCA1581 PEK → KHN May 18, 10:40 UTCMay 18, 10:55 UTC15m
2026-05-18 CCA1809 PEK → XMN May 18, 01:50 UTCMay 18, 02:00 UTC10m
2026-05-17 CCA1635 PEK → SHE May 17, 11:01 UTCMay 17, 11:10 UTC10m
2026-05-17 CCA1738 SZX → HGH May 17, 03:05 UTCMay 17, 03:20 UTC15m
2026-05-17 CCA1737 HGH → SZX May 17, 01:10 UTCMay 17, 01:35 UTC25m
2026-05-13 CCA1734 SZX → HGH May 13, 11:45 UTCMay 13, 12:00 UTC15m
2026-05-13 CCA1733 HGH → SZX May 13, 08:15 UTCMay 13, 08:25 UTC10m
2026-05-09 CCA1734 SZX → HGH May 9, 11:10 UTCMay 9, 11:20 UTC10m
2026-05-09 CCA1733 HGH → SZX May 9, 09:05 UTCMay 9, 09:25 UTC20m
2026-05-09 CCA1738 SZX → HGH May 9, 04:15 UTCMay 9, 04:30 UTC15m
2026-05-09 CCA1737 HGH → SZX May 9, 02:15 UTCMay 9, 02:30 UTC15m
2026-05-08 CCA742 HAN → PEK May 8, 09:34 UTCMay 8, 09:44 UTC10m
2026-05-08 CCA741 PEK → HAN May 8, 01:00 UTCMay 8, 01:24 UTC25m
2026-05-07 CCA1304 SZX → PEK May 7, 10:20 UTCMay 7, 10:35 UTC15m
2026-05-07 CCA1303 PEK → SZX May 7, 08:00 UTCMay 7, 08:10 UTC10m
2026-05-07 CCA1303 PEK → SZX May 7, 05:15 UTCMay 7, 05:30 UTC15m
2026-05-06 CCA1931 PEK → NNG May 6, 11:55 UTCMay 6, 12:20 UTC25m
2026-05-06 CCA741 PEK → HAN May 6, 01:15 UTCMay 6, 01:40 UTC25m
2026-05-05 CCA1288 URC → PEK May 5, 16:50 UTCMay 5, 17:10 UTC20m
2026-05-05 CCA1287 PEK → URC May 5, 10:25 UTCMay 5, 10:40 UTC15m
2026-05-05 CCA1738 SZX → HGH May 5, 03:15 UTCMay 5, 03:25 UTC10m
2026-05-05 CCA1737 HGH → SZX May 5, 01:20 UTCMay 5, 01:40 UTC20m
2026-05-04 CCA1735 HGH → SZX May 4, 14:55 UTCMay 4, 15:15 UTC20m
2026-05-03 CCA1704 PEK → HGH May 3, 23:55 UTCMay 4, 00:05 UTC10m
2026-05-03 CCA1635 PEK → SHE May 3, 11:15 UTCMay 3, 11:25 UTC10m
2026-05-03 CCA809 PEK → VVO May 3, 03:10 UTCMay 3, 03:25 UTC15m
2026-05-02 CCA1821 PEK → FOC May 2, 14:30 UTCMay 2, 14:45 UTC15m
2026-05-02 CCA741 PEK → HAN May 2, 01:10 UTCMay 2, 01:35 UTC25m
2026-05-01 CCA1345 PEK → SYX May 1, 08:15 UTCMay 1, 08:30 UTC15m
2026-04-29 CCA1738 SZX → HGH Apr 29, 03:19 UTCApr 29, 03:30 UTC10m
2026-04-29 CCA1737 HGH → SZX Apr 29, 01:35 UTCApr 29, 01:50 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-325M page for operator, model, and routing details .

Mode-S 781C3E frequently asked

What is Mode-S code 781C3E?
781C3E is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-325M.
Where is Mode-S 781C3E registered?
Mode-S code 781C3E is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781C3E broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781C3E, octal 36016076, decimal 7,871,550.
What flights does 781C3E operate?
Mode-S 781C3E has broadcast 20 distinct callsigns, including CCA741, CCA1738, CCA1737, CCA742, CCA1635.