Apparatus

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sensors Mode-S transponder

781E4B

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32CC · AIRBUS A-321neo

Hex
781E4B
Octal
36017113
Decimal
7,872,075
Country
CN
Tail
B-32CC
Type
A21N
No current signal · last broadcast 9h ago
Flights observed
75
Distinct callsigns
20
Country
CN
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 781E4B.

Country allocation

The ICAO 24-bit address 781E4B 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
CCA414 - 13 2026-06-25
CCA413 - 11 2026-06-22
CCA4297 - 5 2026-07-04
CCA4182 Air China 5 2026-07-16
CCA4116 - 4 2026-07-17
CCA4324 - 3 2026-07-18
CCA4298 Air China 3 2026-06-26
CCA4323 - 2 2026-07-18
CCA4108 Air China 2 2026-07-26
CCA4102 - 2 2026-06-27
CCA4338 - 1 2026-06-20
CCA4336 - 1 2026-07-10
CCA4326 - 1 2026-06-29
CCA4325 - 1 2026-06-29
CCA4316 Air China 1 2026-06-21
CCA4314 - 1 2026-07-03
CCA4184 - 1 2026-07-03
CCA4118 - 1 2026-06-28
CCA4117 - 1 2026-06-28
CCA4115 Air China 1 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA4108 PEK → CTU Jul 26, 06:40 UTCJul 26, 07:05 UTC25m
2026-07-26 CCA4107 CTU → PEK Jul 26, 04:15 UTCJul 26, 04:30 UTC15m
2026-07-19 CCA4035 - Jul 19, 01:55 UTCJul 19, 02:15 UTC20m
2026-07-18 CCA4324 - Jul 18, 13:00 UTCJul 18, 13:15 UTC15m
2026-07-18 CCA4323 - Jul 18, 11:15 UTCJul 18, 11:25 UTC10m
2026-07-17 CCA4116 - Jul 17, 07:30 UTCJul 17, 07:44 UTC15m
2026-07-17 CCA4115 CTU → PEK Jul 17, 05:15 UTCJul 17, 05:30 UTC15m
2026-07-16 CCA4182 PEK → CTU Jul 16, 23:15 UTCJul 16, 23:40 UTC25m
2026-07-12 CCA4116 - Jul 12, 07:20 UTCJul 12, 07:45 UTC25m
2026-07-11 CCA4182 - Jul 11, 23:30 UTCJul 11, 23:50 UTC20m
2026-07-10 CCA4336 - Jul 10, 14:00 UTCJul 10, 14:15 UTC15m
2026-07-09 CCA4324 - Jul 9, 13:35 UTCJul 9, 13:45 UTC10m
2026-07-06 CCA4116 - Jul 6, 07:20 UTCJul 6, 07:35 UTC15m
2026-07-05 CCA4182 PEK → CTU Jul 5, 23:10 UTCJul 5, 23:30 UTC20m
2026-07-05 CCA1444 - Jul 5, 18:05 UTCJul 5, 18:20 UTC15m
2026-07-05 CCA1443 - Jul 5, 11:55 UTCJul 5, 12:15 UTC20m
2026-07-04 CCA1925 - Jul 4, 23:30 UTCJul 4, 23:50 UTC20m
2026-07-04 CCA4297 - Jul 4, 04:05 UTCJul 4, 04:15 UTC10m
2026-07-03 CCA4314 - Jul 3, 10:55 UTCJul 3, 11:10 UTC15m
2026-07-03 CCA4184 - Jul 3, 01:25 UTCJul 3, 01:45 UTC20m
2026-07-01 CCA4182 PEK → CTU Jul 1, 23:20 UTCJul 1, 23:40 UTC20m
2026-06-29 CCA4324 - Jun 29, 14:29 UTCJun 29, 14:44 UTC15m
2026-06-29 CCA4323 - Jun 29, 12:14 UTCJun 29, 12:24 UTC10m
2026-06-29 CCA4326 - Jun 29, 06:34 UTCJun 29, 06:50 UTC15m
2026-06-29 CCA4325 - Jun 29, 02:54 UTCJun 29, 03:05 UTC10m
2026-06-28 CCA4118 - Jun 28, 14:19 UTCJun 28, 14:34 UTC15m
2026-06-28 CCA4117 - Jun 28, 11:04 UTCJun 28, 11:35 UTC30m
2026-06-27 CCA4102 - Jun 27, 05:29 UTCJun 27, 05:44 UTC15m
2026-06-26 CCA4298 HAK → CTU Jun 26, 06:54 UTCJun 26, 07:10 UTC15m
2026-06-26 - - Jun 26, 04:14 UTCJun 26, 04:24 UTC10m
2026-06-25 CCA414 - Jun 25, 04:14 UTCJun 25, 08:50 UTC4h 35m
2026-06-23 CCA414 - Jun 23, 04:14 UTCJun 23, 08:50 UTC4h 35m
2026-06-22 CCA413 - Jun 22, 07:10 UTCJun 23, 05:00 UTC21h 50m
2026-06-21 CCA4316 HAK → CTU Jun 21, 10:09 UTCJun 21, 10:34 UTC25m
2026-06-20 CCA4110 - Jun 20, 11:34 UTCJun 20, 11:59 UTC25m
2026-06-20 CCA4338 - Jun 20, 03:24 UTCJun 20, 03:39 UTC15m
2026-06-19 CCA4108 - Jun 19, 06:39 UTCJun 19, 07:04 UTC25m
2026-06-15 CCA4298 HAK → CTU Jun 15, 07:00 UTCJun 15, 07:25 UTC25m
2026-06-15 CCA4297 CTU → HAK Jun 15, 04:10 UTCJun 15, 04:30 UTC20m
2026-06-12 CCA4102 PEK → CTU Jun 12, 05:15 UTCJun 12, 05:40 UTC25m
2026-06-11 CCA4106 PEK → CTU Jun 11, 12:55 UTCJun 11, 13:10 UTC15m
2026-06-11 CCA4105 CTU → PEK Jun 11, 10:00 UTCJun 11, 10:15 UTC15m
2026-06-10 CCA4297 CTU → HAK Jun 10, 04:35 UTCJun 10, 06:55 UTC2h 20m
2026-06-06 CCA4036 SYX → CTU Jun 6, 15:10 UTCJun 6, 15:30 UTC20m
2026-06-06 CCA4116 PEK → CTU Jun 6, 07:15 UTCJun 6, 12:49 UTC5h 35m
2026-06-05 CCA4182 PEK → CTU Jun 5, 23:15 UTCJun 5, 23:40 UTC25m
2026-06-01 CCA4297 CTU → HAK Jun 1, 04:10 UTCJun 1, 04:20 UTC10m
2026-05-30 CCA4298 HAK → CTU May 30, 06:50 UTCMay 30, 07:00 UTC10m
2026-05-29 CCA4297 CTU → HAK May 29, 08:50 UTCMay 30, 04:40 UTC19h 50m
2026-05-29 CCA414 HKT → TFU May 29, 07:45 UTCMay 30, 04:40 UTC20h 55m

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-32CC page for operator, model, and routing details .

Mode-S 781E4B frequently asked

What is Mode-S code 781E4B?
781E4B is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32CC.
Where is Mode-S 781E4B registered?
Mode-S code 781E4B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E4B broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E4B, octal 36017113, decimal 7,872,075.
What flights does 781E4B operate?
Mode-S 781E4B has broadcast 20 distinct callsigns, including CCA414, CCA413, CCA4297, CCA4182, CCA4116.