Apparatus

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sensors Mode-S transponder

781C6F

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-326C · AIRBUS A-321neo

Hex
781C6F
Octal
36016157
Decimal
7,871,599
Country
CN
Tail
B-326C
Type
A21N
No current signal · last broadcast 8h ago
Flights observed
78
Distinct callsigns
20
Country
CN
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 781C6F.

Country allocation

The ICAO 24-bit address 781C6F 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 - 21 2026-07-10
CCA413 - 12 2026-07-14
CCA4182 Air China 5 2026-06-27
CCA4116 - 5 2026-06-28
CCA4315 Air China 4 2026-06-24
CCA4323 - 3 2026-06-19
CCA4324 - 2 2026-06-19
CCA4313 Air China 2 2026-06-12
CCA4312 Air China 2 2026-06-04
CCA4298 - 2 2026-06-27
CCA4297 - 2 2026-06-27
CCA4181 - 2 2026-06-21
CCA4110 - 2 2026-06-29
CCA4338 Air China 1 2026-06-10
CCA4337 Air China 1 2026-06-10
CCA4336 - 1 2026-06-17
CCA4316 Air China 1 2026-06-15
CCA4314 Air China 1 2026-05-10
CCA4311 Air China 1 2026-06-04
CCA4120 Air China 1 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CCA413 - Jul 14, 03:15 UTCJul 14, 09:25 UTC6h 10m
2026-07-12 CCA413 - Jul 12, 03:10 UTCJul 12, 08:20 UTC5h 10m
2026-07-10 CCA414 - Jul 10, 03:20 UTCJul 10, 09:25 UTC6h 5m
2026-07-08 CCA413 - Jul 8, 03:10 UTCJul 8, 09:25 UTC6h 15m
2026-07-01 CCA4048 - Jul 1, 13:30 UTCJul 1, 13:45 UTC15m
2026-07-01 CCA4047 - Jul 1, 10:40 UTCJul 1, 11:20 UTC40m
2026-06-29 CCA4110 - Jun 29, 12:14 UTCJun 29, 12:39 UTC25m
2026-06-28 CCA4116 - Jun 28, 07:20 UTCJun 28, 07:29 UTC10m
2026-06-27 CCA4182 PEK → CTU Jun 27, 23:19 UTCJun 27, 23:39 UTC20m
2026-06-27 CCA4298 - Jun 27, 06:50 UTCJun 27, 06:59 UTC10m
2026-06-27 CCA4297 - Jun 27, 04:09 UTCJun 27, 04:24 UTC15m
2026-06-26 CCA414 - Jun 26, 07:50 UTCJun 27, 04:24 UTC20h 35m
2026-06-26 CCA414 - Jun 26, 04:00 UTCJun 26, 09:00 UTC5h 0m
2026-06-24 CCA4315 CTU → HAK Jun 24, 07:44 UTCJun 24, 07:59 UTC15m
2026-06-22 CCA4116 - Jun 22, 07:40 UTCJun 22, 07:54 UTC15m
2026-06-22 CCA4115 - Jun 22, 05:10 UTCJun 22, 05:20 UTC10m
2026-06-21 CCA4182 PEK → CTU Jun 21, 23:24 UTCJun 21, 23:44 UTC20m
2026-06-21 CCA4181 - Jun 21, 12:04 UTCJun 21, 12:14 UTC10m
2026-06-20 CCA4102 - Jun 20, 04:59 UTCJun 20, 05:24 UTC25m
2026-06-19 CCA4324 - Jun 19, 14:15 UTCJun 19, 14:24 UTC10m
2026-06-19 CCA4323 - Jun 19, 11:45 UTCJun 19, 11:54 UTC10m
2026-06-18 CCA4324 - Jun 18, 17:21 UTCJun 18, 17:30 UTC9m
2026-06-18 CCA4323 - Jun 18, 15:35 UTCJun 18, 15:50 UTC15m
2026-06-17 CCA4336 - Jun 17, 15:15 UTCJun 17, 15:30 UTC15m
2026-06-15 CCA4316 HAK → CTU Jun 15, 10:15 UTCJun 15, 10:30 UTC15m
2026-06-15 CCA4315 CTU → HAK Jun 15, 07:45 UTCJun 15, 08:04 UTC20m
2026-06-14 CCA4315 CTU → HAK Jun 14, 10:15 UTCJun 15, 08:04 UTC21h 49m
2026-06-14 CCA4315 CTU → HAK Jun 14, 07:45 UTCJun 14, 08:00 UTC15m
2026-06-13 CCA4120 PEK → CTU Jun 13, 03:25 UTCJun 13, 03:45 UTC20m
2026-06-12 CCA4313 CTU → SZX Jun 12, 09:25 UTCJun 12, 09:35 UTC10m
2026-06-10 CCA4110 PEK → CTU Jun 10, 11:40 UTCJun 10, 12:00 UTC20m
2026-06-10 CCA4338 SZX → CTU Jun 10, 03:30 UTCJun 10, 03:40 UTC10m
2026-06-10 CCA4337 CTU → SZX Jun 10, 01:25 UTCJun 10, 01:35 UTC10m
2026-06-08 CCA4036 SYX → CTU Jun 8, 05:50 UTCJun 8, 06:15 UTC25m
2026-06-07 CCA4035 CTU → SYX Jun 7, 07:50 UTCJun 8, 02:35 UTC18h 45m
2026-06-07 CCA4116 PEK → CTU Jun 7, 07:30 UTCJun 8, 02:35 UTC19h 5m
2026-06-06 CCA4182 PEK → CTU Jun 6, 23:05 UTCJun 6, 23:24 UTC20m
2026-06-06 CCA4298 HAK → CTU Jun 6, 06:45 UTCJun 6, 06:55 UTC10m
2026-06-06 CCA4297 CTU → HAK Jun 6, 04:15 UTCJun 6, 04:25 UTC10m
2026-06-04 CCA4312 SZX → CTU Jun 4, 10:55 UTCJun 4, 11:10 UTC15m
2026-06-04 CCA4311 CTU → SZX Jun 4, 09:15 UTCJun 4, 09:30 UTC15m
2026-05-26 CCA414 HKT → TFU May 26, 03:40 UTCMay 26, 09:04 UTC5h 25m
2026-05-24 CCA414 HKT → TFU May 24, 03:40 UTCMay 24, 08:50 UTC5h 10m
2026-05-22 CCA414 HKT → TFU May 22, 03:35 UTCMay 22, 08:55 UTC5h 20m
2026-05-18 CCA414 HKT → TFU May 18, 04:11 UTCMay 18, 08:25 UTC4h 15m
2026-05-11 CCA4312 SZX → CTU May 11, 11:05 UTCMay 11, 11:15 UTC10m
2026-05-10 CCA4314 SZX → CTU May 10, 09:30 UTCMay 10, 09:45 UTC15m
2026-05-10 CCA4313 CTU → SZX May 10, 07:34 UTCMay 10, 07:50 UTC15m
2026-05-09 CCA4116 PEK → CTU May 9, 07:10 UTCMay 9, 07:30 UTC20m
2026-05-08 CCA4182 PEK → CTU May 8, 23:15 UTCMay 8, 23:40 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-326C page for operator, model, and routing details .

Mode-S 781C6F frequently asked

What is Mode-S code 781C6F?
781C6F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-326C.
Where is Mode-S 781C6F registered?
Mode-S code 781C6F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781C6F broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781C6F, octal 36016157, decimal 7,871,599.
What flights does 781C6F operate?
Mode-S 781C6F has broadcast 20 distinct callsigns, including CCA414, CCA413, CCA4182, CCA4116, CCA4315.