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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 Jul 26, 15:05 UTC
Flights observed
119
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 15:05 UTC

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
CCA811 Air China 3 2026-07-19
CCA741 - 3 2026-07-14
CCA4184 - 3 2026-06-29
CCA1311 Air China 3 2026-06-07
CCA9631 Air China 2 2026-07-21
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
CCA1732 Air China 2 2026-07-26
CCA1554 - 2 2026-06-27
CCA134 Air China 2 2026-06-06
CCA133 Air China 2 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA1732 SZX → HGH Jul 26, 14:55 UTCJul 26, 15:05 UTC10m
2026-07-26 CCA1202 XIY → PEK Jul 26, 10:50 UTCJul 26, 11:20 UTC30m
2026-07-26 CCA1201 PEK → XIY Jul 26, 06:25 UTCJul 26, 06:35 UTC11m
2026-07-26 CCA1920 HAK → PEK Jul 26, 04:25 UTCJul 26, 04:35 UTC10m
2026-07-25 CCA1919 PEK → HAK Jul 25, 10:00 UTCJul 25, 10:10 UTC10m
2026-07-25 CCA1704 PEK → HGH Jul 25, 00:00 UTCJul 25, 00:35 UTC35m
2026-07-24 CCA1911 - Jul 24, 09:00 UTCJul 24, 16:00 UTC7h 0m
2026-07-24 CCA1627 PEK → CGQ Jul 24, 02:40 UTCJul 24, 02:50 UTC10m
2026-07-23 CCA1212 URC → PEK Jul 23, 13:30 UTCJul 23, 13:55 UTC25m
2026-07-23 CCA1211 PEK → URC Jul 23, 05:10 UTCJul 23, 05:25 UTC15m
2026-07-22 CCA1218 - Jul 22, 02:25 UTCJul 22, 02:45 UTC20m
2026-07-21 CCA1217 - Jul 21, 13:20 UTCJul 21, 13:50 UTC30m
2026-07-21 CCA9632 KWE → PEK Jul 21, 11:30 UTCJul 21, 11:40 UTC10m
2026-07-21 CCA9631 PEK → NDG Jul 21, 04:45 UTCJul 21, 05:05 UTC20m
2026-07-19 CCA1525 - Jul 19, 12:40 UTCJul 19, 12:50 UTC10m
2026-07-19 CCA811 PEK → VVO Jul 19, 05:20 UTCJul 19, 05:30 UTC10m
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

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 Jul 26, 15:05 UTC.
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, CCA811, CCA741, CCA4184.