Apparatus

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sensors Mode-S transponder

781E4C

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-33CD · AIRBUS A-321neo

Hex
781E4C
Octal
36017114
Decimal
7,872,076
Country
CN
Tail
B-33CD
Type
A21N
No current signal · last broadcast 7h ago
Flights observed
103
Distinct callsigns
20
Country
CN
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 781E4C.

Country allocation

The ICAO 24-bit address 781E4C 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
CCA745 - 6 2026-06-27
CCA809 - 4 2026-07-18
CCA741 - 3 2026-07-14
CCA4184 - 3 2026-06-29
CCA1311 Air China 3 2026-06-07
CCA811 Air China 2 2026-04-28
CCA742 - 2 2026-07-14
CCA4314 - 2 2026-06-29
CCA4298 - 2 2026-07-01
CCA1959 Air China 2 2026-04-30
CCA1931 Air China 2 2026-05-17
CCA1906 Air China 2 2026-05-02
CCA1905 Air China 2 2026-05-02
CCA1821 - 2 2026-07-06
CCA1738 Air China 2 2026-06-03
CCA1554 - 2 2026-06-27
CCA134 Air China 2 2026-06-06
CCA133 Air China 2 2026-06-06
CCA1294 Air China 2 2026-06-21
CCA1293 Air China 2 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 CCA1443 - Jul 18, 12:15 UTCJul 18, 12:35 UTC20m
2026-07-18 CCA809 - Jul 18, 04:15 UTCJul 18, 04:25 UTC10m
2026-07-17 CCA1732 - Jul 17, 14:50 UTCJul 17, 15:00 UTC10m
2026-07-17 CCA1238 - Jul 17, 05:20 UTCJul 17, 05:39 UTC20m
2026-07-16 CCA1237 - Jul 16, 22:25 UTCJul 16, 22:40 UTC15m
2026-07-16 CCA1933 - Jul 16, 07:55 UTCJul 16, 08:20 UTC25m
2026-07-16 CCA1238 - Jul 16, 05:10 UTCJul 16, 05:30 UTC20m
2026-07-15 CCA1237 - Jul 15, 22:30 UTCJul 15, 22:40 UTC10m
2026-07-14 - - Jul 14, 11:30 UTCJul 14, 11:40 UTC10m
2026-07-14 CCA742 - Jul 14, 06:45 UTCJul 14, 07:05 UTC20m
2026-07-14 CCA741 - Jul 14, 01:25 UTCJul 14, 01:50 UTC25m
2026-07-13 CCA9608 - Jul 13, 15:15 UTCJul 13, 15:30 UTC15m
2026-07-13 CCA9607 - Jul 13, 07:15 UTCJul 13, 07:40 UTC25m
2026-07-13 CCA1651 - Jul 13, 00:55 UTCJul 13, 01:05 UTC10m
2026-07-12 CCA1811 - Jul 12, 09:55 UTCJul 12, 10:10 UTC15m
2026-07-12 CCA1399 - Jul 12, 02:30 UTCJul 12, 02:50 UTC20m
2026-07-11 CCA9631 - Jul 11, 02:10 UTCJul 11, 02:35 UTC25m
2026-07-10 CCA1578 - Jul 10, 16:15 UTCJul 10, 16:25 UTC10m
2026-07-09 CCA1461 - Jul 9, 23:35 UTCJul 10, 00:00 UTC25m
2026-07-09 CCA1236 - Jul 9, 14:00 UTCJul 9, 14:20 UTC20m
2026-07-09 CCA1235 - Jul 9, 09:40 UTCJul 9, 10:00 UTC20m
2026-07-08 CCA1914 - Jul 8, 10:40 UTCJul 8, 10:55 UTC15m
2026-07-08 CCA1913 - Jul 8, 07:15 UTCJul 8, 07:30 UTC15m
2026-07-08 CCA1879 - Jul 8, 00:30 UTCJul 8, 00:40 UTC10m
2026-07-07 CCA1565 - Jul 7, 13:45 UTCJul 7, 13:55 UTC10m
2026-07-07 CCA810 - Jul 7, 09:10 UTCJul 7, 09:30 UTC20m
2026-07-07 CCA809 - Jul 7, 03:30 UTCJul 7, 03:40 UTC10m
2026-07-06 CCA1821 - Jul 6, 15:25 UTCJul 6, 15:40 UTC15m
2026-07-06 CCA1361 - Jul 6, 00:45 UTCJul 6, 01:05 UTC20m
2026-07-05 CCA1636 - Jul 5, 14:40 UTCJul 5, 15:00 UTC20m
2026-07-04 CCA1821 - Jul 4, 14:20 UTCJul 4, 14:30 UTC10m
2026-07-01 CCA4298 - Jul 1, 06:50 UTCJul 1, 07:10 UTC20m
2026-06-30 CCA4298 - Jun 30, 10:20 UTCJul 1, 07:10 UTC20h 50m
2026-06-30 CCA4315 - Jun 30, 07:45 UTCJul 1, 07:00 UTC23h 15m
2026-06-29 CCA4314 - Jun 29, 09:40 UTCJun 29, 09:50 UTC10m
2026-06-29 CCA4184 - Jun 29, 01:20 UTCJun 29, 01:44 UTC25m
2026-06-28 CCA1938 - Jun 28, 18:25 UTCJun 28, 18:40 UTC15m
2026-06-28 CCA1937 - Jun 28, 10:04 UTCJun 28, 10:30 UTC25m
2026-06-28 CCA1710 - Jun 28, 02:54 UTCJun 28, 03:09 UTC15m
2026-06-27 CCA745 - Jun 27, 11:25 UTCJun 27, 19:24 UTC8h 0m
2026-06-27 CCA1554 - Jun 27, 03:55 UTCJun 27, 04:09 UTC15m
2026-06-26 CCA1801 - Jun 26, 13:19 UTCJun 26, 13:34 UTC15m
2026-06-25 CCA4338 - Jun 25, 03:34 UTCJun 25, 03:44 UTC10m
2026-06-22 CCA4314 - Jun 22, 09:40 UTCJun 22, 09:49 UTC10m
2026-06-22 CCA4184 PEK → CTU Jun 22, 01:19 UTCJun 22, 01:44 UTC25m
2026-06-21 CCA1294 URC → PEK Jun 21, 15:19 UTCJun 21, 15:40 UTC20m
2026-06-21 CCA1293 PEK → URC Jun 21, 07:09 UTCJun 21, 07:34 UTC25m
2026-06-20 CCA745 - Jun 20, 11:25 UTCJun 20, 19:19 UTC7h 55m
2026-06-20 CCA809 PEK → VVO Jun 20, 03:24 UTCJun 20, 03:34 UTC10m
2026-06-18 CCA742 HAN → PEK Jun 18, 06:45 UTCJun 18, 07:10 UTC25m

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-33CD page for operator, model, and routing details .

Mode-S 781E4C frequently asked

What is Mode-S code 781E4C?
781E4C is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-33CD.
Where is Mode-S 781E4C registered?
Mode-S code 781E4C is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E4C broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E4C, octal 36017114, decimal 7,872,076.
What flights does 781E4C operate?
Mode-S 781E4C has broadcast 20 distinct callsigns, including CCA745, CCA809, CCA741, CCA4184, CCA1311.