Apparatus

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sensors Mode-S transponder

781E4F

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32C9 · AIRBUS A-321neo

Hex
781E4F
Octal
36017117
Decimal
7,872,079
Country
CN
Tail
B-32C9
Type
A21N
No current signal · last broadcast 17h ago
Flights observed
69
Distinct callsigns
20
Country
CN
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S 781E4F.

Country allocation

The ICAO 24-bit address 781E4F 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
CCA4182 Air China 6 2026-06-26
CCA414 Air China 6 2026-04-22
CCA413 Air China 6 2026-04-24
CCA4314 - 5 2026-07-05
CCA4102 - 5 2026-07-12
CCA4116 - 4 2026-06-27
CCA4115 - 3 2026-06-27
CCA4338 - 2 2026-07-02
CCA4336 - 2 2026-06-21
CCA4324 Air China 2 2026-06-12
CCA4316 Air China 2 2026-06-18
CCA4110 - 2 2026-07-06
CCA4109 - 2 2026-07-02
CCA4035 Air China 2 2026-06-19
CCA9681 - 1 2026-07-02
CCA4339 - 1 2026-07-13
CCA4335 Air China 1 2026-05-29
CCA4326 Air China 1 2026-05-12
CCA4315 - 1 2026-07-01
CCA4313 - 1 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CCA4339 - Jul 13, 15:20 UTCJul 13, 15:30 UTC10m
2026-07-12 CCA4102 - Jul 12, 05:01 UTCJul 12, 11:25 UTC6h 25m
2026-07-11 CCA4047 - Jul 11, 10:55 UTCJul 11, 11:15 UTC20m
2026-07-10 CCA4068 - Jul 10, 12:45 UTCJul 10, 12:55 UTC10m
2026-07-10 CCA4102 - Jul 10, 05:30 UTCJul 10, 05:55 UTC25m
2026-07-08 CCA4108 - Jul 8, 06:40 UTCJul 8, 07:00 UTC20m
2026-07-07 CCA4181 - Jul 7, 07:05 UTCJul 7, 12:55 UTC5h 50m
2026-07-06 CCA4110 - Jul 6, 12:55 UTCJul 7, 07:25 UTC18h 30m
2026-07-05 CCA4314 - Jul 5, 11:25 UTCJul 5, 11:40 UTC15m
2026-07-05 CCA4313 - Jul 5, 09:25 UTCJul 5, 09:35 UTC10m
2026-07-04 CCA4102 - Jul 4, 05:10 UTCJul 4, 05:35 UTC25m
2026-07-03 CCA1609 PEK → CGQ Jul 3, 23:50 UTCJul 4, 00:05 UTC15m
2026-07-03 CCA1361 - Jul 3, 00:45 UTCJul 3, 01:05 UTC20m
2026-07-02 CCA9681 - Jul 2, 12:40 UTCJul 2, 12:55 UTC15m
2026-07-02 CCA4109 - Jul 2, 09:35 UTCJul 2, 09:45 UTC10m
2026-07-02 CCA4338 - Jul 2, 03:30 UTCJul 2, 03:40 UTC10m
2026-07-01 CCA4315 - Jul 1, 07:50 UTCJul 1, 08:00 UTC10m
2026-06-27 CCA4116 - Jun 27, 07:24 UTCJun 27, 07:39 UTC15m
2026-06-27 CCA4115 - Jun 27, 05:25 UTCJun 27, 05:35 UTC10m
2026-06-26 CCA4182 PEK → CTU Jun 26, 23:19 UTCJun 26, 23:44 UTC25m
2026-06-25 CCA4120 - Jun 25, 03:15 UTCJun 25, 03:40 UTC25m
2026-06-21 CCA4336 - Jun 21, 13:39 UTCJun 21, 13:50 UTC10m
2026-06-19 CCA4035 CTU → SYX Jun 19, 23:14 UTCJun 20, 12:50 UTC13h 35m
2026-06-19 CCA4298 HAK → CTU Jun 19, 06:54 UTCJun 19, 07:19 UTC25m
2026-06-18 CCA4316 HAK → CTU Jun 18, 11:25 UTCJun 19, 04:19 UTC16h 54m
2026-06-18 CCA4316 HAK → CTU Jun 18, 09:15 UTCJun 19, 04:19 UTC19h 4m
2026-06-13 CCA4102 PEK → CTU Jun 13, 05:10 UTCJun 13, 05:25 UTC15m
2026-06-12 CCA4324 SZX → CTU Jun 12, 12:45 UTCJun 12, 13:00 UTC15m
2026-06-10 CCA4314 SZX → CTU Jun 10, 09:25 UTCJun 10, 09:35 UTC10m
2026-06-09 CCA4324 SZX → CTU Jun 9, 12:40 UTCJun 9, 12:50 UTC10m
2026-06-05 CCA4116 PEK → CTU Jun 5, 07:25 UTCJun 5, 07:40 UTC15m
2026-06-05 CCA4115 CTU → PEK Jun 5, 05:15 UTCJun 5, 05:25 UTC10m
2026-06-04 CCA4182 PEK → CTU Jun 4, 23:05 UTCJun 4, 23:35 UTC30m
2026-06-04 CCA4297 CTU → HAK Jun 4, 04:10 UTCJun 4, 07:10 UTC3h 0m
2026-06-03 CCA4035 CTU → SYX Jun 3, 01:55 UTCJun 3, 05:10 UTC3h 15m
2026-05-30 CCA4314 SZX → CTU May 30, 09:40 UTCMay 30, 09:50 UTC10m
2026-05-29 CCA4336 SZX → CTU May 29, 17:25 UTCMay 29, 17:35 UTC10m
2026-05-29 CCA4335 CTU → SZX May 29, 15:30 UTCMay 29, 15:40 UTC10m
2026-05-26 CCA4302 CAN → CTU May 26, 08:50 UTCMay 26, 08:59 UTC10m
2026-05-23 CCA4338 SZX → CTU May 23, 03:50 UTCMay 23, 04:00 UTC10m
2026-05-19 CCA4106 PEK → CTU May 19, 12:35 UTCMay 19, 13:00 UTC25m
2026-05-17 CCA4182 PEK → CTU May 17, 23:15 UTCMay 18, 08:55 UTC9h 40m
2026-05-17 CCA1593 PEK → YNT May 17, 12:35 UTCMay 17, 12:50 UTC15m
2026-05-12 CCA4326 SZX → CTU May 12, 05:00 UTCMay 12, 05:20 UTC20m
2026-05-09 CCA4182 PEK → CTU May 9, 23:15 UTCMay 9, 23:35 UTC20m
2026-05-09 CCA4102 PEK → CTU May 9, 05:05 UTCMay 9, 05:20 UTC15m
2026-05-08 CCA4116 PEK → CTU May 8, 07:14 UTCMay 8, 07:29 UTC15m
2026-05-08 CCA4115 CTU → PEK May 8, 05:09 UTCMay 8, 05:20 UTC10m
2026-05-07 CCA4182 PEK → CTU May 7, 23:09 UTCMay 7, 23:29 UTC20m
2026-05-06 CCA4116 PEK → CTU May 6, 07:05 UTCMay 6, 07:25 UTC20m

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-32C9 page for operator, model, and routing details .

Mode-S 781E4F frequently asked

What is Mode-S code 781E4F?
781E4F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32C9.
Where is Mode-S 781E4F registered?
Mode-S code 781E4F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E4F broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E4F, octal 36017117, decimal 7,872,079.
What flights does 781E4F operate?
Mode-S 781E4F has broadcast 20 distinct callsigns, including CCA4182, CCA414, CCA413, CCA4314, CCA4102.