Apparatus

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sensors Mode-S transponder

781CA6

ICAO 24-bit transponder address · allocated to China

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

Hex
781CA6
Octal
36016246
Decimal
7,871,654
Country
CN
Tail
B-326U
Type
A21N
No current signal · last broadcast 25d ago
Flights observed
66
Distinct callsigns
20
Country
CN
Last broadcast
25d ago

Last known position

Most recent position reported by Mode-S 781CA6.

Country allocation

The ICAO 24-bit address 781CA6 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
CCA4312 - 5 2026-07-20
CCA4116 Air China 5 2026-07-25
CCA4102 - 5 2026-06-26
CCA4326 Air China 4 2026-07-23
CCA4311 - 4 2026-07-20
CCA4182 Air China 4 2026-07-24
CCA4118 - 4 2026-06-25
CCA4110 Air China 4 2026-05-26
CCA4035 - 3 2026-06-28
CCA4325 Air China 2 2026-07-23
CCA4281 - 2 2026-07-08
CCA4120 Air China 2 2026-07-20
CCA4117 Air China 2 2026-06-07
CCA4108 Air China 2 2026-07-17
CCA4036 - 2 2026-06-28
CCA4336 - 1 2026-07-15
CCA4335 - 1 2026-07-15
CCA4324 - 1 2026-06-27
CCA4316 Air China 1 2026-06-02
CCA4315 Air China 1 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CCA4116 PEK → CTU Jul 25, 07:20 UTCJul 25, 07:40 UTC20m
2026-07-24 CCA4182 PEK → CTU Jul 24, 23:15 UTCJul 25, 05:40 UTC6h 25m
2026-07-24 CCA4183 CTU → PEK Jul 24, 13:10 UTCJul 24, 13:40 UTC30m
2026-07-23 CCA4326 SZX → CTU Jul 23, 05:05 UTCJul 23, 05:20 UTC15m
2026-07-23 CCA4325 CTU → SZX Jul 23, 03:05 UTCJul 23, 03:15 UTC10m
2026-07-20 CCA4312 - Jul 20, 11:10 UTCJul 20, 11:20 UTC10m
2026-07-20 CCA4311 - Jul 20, 09:05 UTCJul 20, 09:15 UTC10m
2026-07-20 CCA4120 PEK → CTU Jul 20, 03:15 UTCJul 20, 03:35 UTC20m
2026-07-17 CCA4108 PEK → CTU Jul 17, 06:40 UTCJul 17, 06:54 UTC15m
2026-07-15 CCA4336 - Jul 15, 14:10 UTCJul 15, 14:20 UTC10m
2026-07-15 CCA4335 - Jul 15, 11:55 UTCJul 15, 12:05 UTC10m
2026-07-12 CCA4312 - Jul 12, 11:01 UTCJul 12, 11:15 UTC15m
2026-07-12 CCA4311 - Jul 12, 09:00 UTCJul 12, 09:10 UTC10m
2026-07-11 CCA4099 - Jul 11, 02:05 UTCJul 11, 12:40 UTC10h 35m
2026-07-09 CCA4053 - Jul 9, 11:05 UTCJul 9, 11:15 UTC10m
2026-07-08 CCA4281 - Jul 8, 02:15 UTCJul 8, 12:20 UTC10h 5m
2026-07-07 CCA4116 - Jul 7, 10:25 UTCJul 8, 02:30 UTC16h 5m
2026-07-06 CCA4182 PEK → CTU Jul 6, 23:10 UTCJul 6, 23:30 UTC20m
2026-07-05 CCA4312 - Jul 5, 12:15 UTCJul 5, 12:30 UTC15m
2026-07-05 CCA4311 - Jul 5, 10:15 UTCJul 5, 10:25 UTC10m
2026-07-04 CCA4104 - Jul 4, 11:00 UTCJul 4, 11:10 UTC10m
2026-07-04 CCA4103 - Jul 4, 08:45 UTCJul 4, 08:55 UTC10m
2026-06-29 CCA4120 - Jun 29, 03:39 UTCJun 29, 04:04 UTC25m
2026-06-28 CCA4036 - Jun 28, 05:09 UTCJun 28, 05:20 UTC10m
2026-06-28 CCA4035 - Jun 28, 01:59 UTCJun 28, 02:29 UTC30m
2026-06-27 CCA4324 - Jun 27, 12:34 UTCJun 27, 12:50 UTC15m
2026-06-26 CCA4102 - Jun 26, 05:19 UTCJun 26, 05:44 UTC25m
2026-06-25 CCA4118 - Jun 25, 13:59 UTCJun 25, 14:20 UTC20m
2026-06-24 CCA4102 - Jun 24, 05:20 UTCJun 24, 05:49 UTC30m
2026-06-23 CCA4102 - Jun 23, 05:15 UTCJun 23, 05:34 UTC20m
2026-06-21 CCA4036 SYX → CTU Jun 21, 04:54 UTCJun 21, 05:15 UTC20m
2026-06-21 CCA4035 CTU → SYX Jun 21, 01:49 UTCJun 21, 02:30 UTC40m
2026-06-19 CCA4326 - Jun 19, 06:10 UTCJun 19, 06:24 UTC15m
2026-06-19 CCA4325 - Jun 19, 03:34 UTCJun 19, 03:44 UTC10m
2026-06-12 CCA4326 SZX → CTU Jun 12, 06:10 UTCJun 12, 06:25 UTC15m
2026-06-11 CCA4314 SZX → CTU Jun 11, 09:35 UTCJun 11, 09:45 UTC10m
2026-06-11 CCA4313 CTU → SZX Jun 11, 07:30 UTCJun 11, 07:40 UTC10m
2026-06-11 CCA4184 PEK → CTU Jun 11, 01:10 UTCJun 11, 01:35 UTC25m
2026-06-10 CCA4108 PEK → CTU Jun 10, 06:10 UTCJun 10, 06:30 UTC20m
2026-06-07 CCA4118 PEK → CTU Jun 7, 14:05 UTCJun 7, 14:30 UTC25m
2026-06-07 CCA4117 CTU → PEK Jun 7, 11:00 UTCJun 7, 11:25 UTC25m
2026-06-06 CCA4312 SZX → CTU Jun 6, 13:30 UTCJun 6, 13:39 UTC10m
2026-06-05 CCA4118 PEK → CTU Jun 5, 14:05 UTCJun 5, 14:30 UTC25m
2026-06-05 CCA4326 SZX → CTU Jun 5, 06:40 UTCJun 5, 06:50 UTC10m
2026-06-04 CCA4116 PEK → CTU Jun 4, 07:45 UTCJun 4, 08:05 UTC20m
2026-06-04 CCA4115 CTU → PEK Jun 4, 05:00 UTCJun 4, 05:30 UTC30m
2026-06-03 CCA4182 PEK → CTU Jun 3, 23:20 UTCJun 3, 23:40 UTC20m
2026-06-03 CCA4181 CTU → PEK Jun 3, 12:00 UTCJun 3, 12:35 UTC35m
2026-06-02 CCA4316 HAK → CTU Jun 2, 10:05 UTCJun 2, 10:15 UTC10m
2026-06-02 CCA4315 CTU → HAK Jun 2, 07:55 UTCJun 2, 08:05 UTC10m

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-326U page for operator, model, and routing details .

Mode-S 781CA6 frequently asked

What is Mode-S code 781CA6?
781CA6 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-326U.
Where is Mode-S 781CA6 registered?
Mode-S code 781CA6 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781CA6 broadcasting right now?
No active broadcast right now. Last signal was 25d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781CA6, octal 36016246, decimal 7,871,654.
What flights does 781CA6 operate?
Mode-S 781CA6 has broadcast 20 distinct callsigns, including CCA4312, CCA4116, CCA4102, CCA4326, CCA4311.