Apparatus

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sensors Mode-S transponder

781DD7

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32A2 · AIRBUS A-321neo

Hex
781DD7
Octal
36016727
Decimal
7,871,959
Country
CN
Tail
B-32A2
Type
A21N
No current signal · last broadcast 4d ago
Flights observed
101
Distinct callsigns
20
Country
CN
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S 781DD7.

Country allocation

The ICAO 24-bit address 781DD7 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 Air China 8 2026-06-11
CCA413 Air China 6 2026-06-05
CCA1353 Air China 4 2026-07-24
CCA4182 Air China 3 2026-05-26
CCA4116 Air China 3 2026-05-27
CCA1738 - 3 2026-07-11
CCA1737 - 3 2026-07-11
CCA109 - 3 2026-07-14
CCA4338 Air China 2 2026-05-25
CCA4314 Air China 2 2026-05-06
CCA1919 Air China 2 2026-07-23
CCA1733 - 2 2026-07-11
CCA1714 - 2 2026-07-08
CCA1712 - 2 2026-07-03
CCA1635 - 2 2026-07-16
CCA1607 - 2 2026-07-15
CCA1505 Air China 2 2026-07-23
CCA1373 Air China 2 2026-07-21
CCA1354 Air China 2 2026-06-28
CCA110 - 2 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA1914 CGO → PEK Jul 26, 10:50 UTCJul 26, 11:00 UTC10m
2026-07-26 CCA1913 PEK → CGO Jul 26, 07:15 UTCJul 26, 07:30 UTC15m
2026-07-26 CCA9844 - Jul 26, 05:05 UTCJul 26, 05:25 UTC20m
2026-07-25 CCA9843 - Jul 25, 22:45 UTCJul 25, 23:10 UTC25m
2026-07-24 CCA1461 PEK → KWE Jul 24, 23:15 UTCJul 25, 05:40 UTC6h 25m
2026-07-24 CCA1353 PEK → SYX Jul 24, 07:50 UTCJul 24, 16:10 UTC8h 20m
2026-07-23 CCA1919 PEK → HAK Jul 23, 11:05 UTCJul 23, 14:00 UTC2h 55m
2026-07-23 CCA1505 PEK → FOC Jul 23, 02:35 UTCJul 23, 02:45 UTC10m
2026-07-22 CCA1899 PEK → NTG Jul 22, 00:50 UTCJul 22, 01:05 UTC15m
2026-07-21 CCA1373 PEK → CSX Jul 21, 06:40 UTCJul 21, 07:00 UTC20m
2026-07-21 CCA163U - Jul 21, 01:25 UTCJul 21, 01:35 UTC10m
2026-07-20 CCA1373 PEK → CSX Jul 20, 05:30 UTCJul 20, 05:55 UTC25m
2026-07-19 CCA1133 PEK → HLD Jul 19, 23:10 UTCJul 19, 23:25 UTC15m
2026-07-19 CCA1353 - Jul 19, 06:55 UTCJul 19, 12:25 UTC5h 30m
2026-07-19 CCA1817 - Jul 19, 00:30 UTCJul 19, 00:40 UTC10m
2026-07-18 CCA116 - Jul 18, 13:40 UTCJul 18, 14:00 UTC20m
2026-07-18 CCA115 PEK → HKG Jul 18, 09:05 UTCJul 18, 12:05 UTC3h 0m
2026-07-18 CCA1643 - Jul 18, 00:29 UTCJul 18, 00:39 UTC10m
2026-07-17 CCA1353 - Jul 17, 07:20 UTCJul 17, 07:35 UTC15m
2026-07-16 CCA1635 - Jul 16, 11:20 UTCJul 16, 11:34 UTC15m
2026-07-16 CCA809 - Jul 16, 03:15 UTCJul 16, 03:25 UTC10m
2026-07-15 CCA1607 - Jul 15, 07:20 UTCJul 15, 07:30 UTC10m
2026-07-15 CCA1575 - Jul 15, 01:30 UTCJul 15, 01:40 UTC10m
2026-07-14 CCA110 - Jul 14, 10:50 UTCJul 14, 11:05 UTC15m
2026-07-14 CCA109 - Jul 14, 08:35 UTCJul 14, 09:20 UTC45m
2026-07-14 CCA109 - Jul 14, 06:00 UTCJul 14, 06:20 UTC20m
2026-07-12 CCA1734 - Jul 12, 09:55 UTCJul 12, 10:10 UTC15m
2026-07-11 CCA1733 - Jul 11, 09:00 UTCJul 11, 09:15 UTC15m
2026-07-11 CCA1738 - Jul 11, 03:15 UTCJul 11, 03:25 UTC10m
2026-07-11 CCA1737 - Jul 11, 00:45 UTCJul 11, 01:30 UTC45m
2026-07-10 CCA1733 - Jul 10, 07:50 UTCJul 10, 08:25 UTC35m
2026-07-10 CCA1738 - Jul 10, 03:10 UTCJul 10, 03:20 UTC10m
2026-07-10 CCA1737 - Jul 10, 01:15 UTCJul 10, 01:40 UTC25m
2026-07-09 CCA1738 - Jul 9, 03:30 UTCJul 9, 03:40 UTC10m
2026-07-09 CCA1737 - Jul 9, 01:40 UTCJul 9, 01:50 UTC10m
2026-07-08 CCA1714 - Jul 8, 04:45 UTCJul 8, 05:00 UTC15m
2026-07-07 CCA1931 - Jul 7, 15:20 UTCJul 7, 15:40 UTC20m
2026-07-07 CCA742 - Jul 7, 06:35 UTCJul 7, 07:00 UTC25m
2026-07-07 CCA741 - Jul 7, 01:20 UTCJul 7, 01:45 UTC25m
2026-07-06 CCA1288 - Jul 6, 16:35 UTCJul 6, 16:55 UTC20m
2026-07-06 CCA1287 - Jul 6, 10:45 UTCJul 6, 11:05 UTC20m
2026-07-05 CCA1369 PEK → SYX Jul 5, 23:30 UTCJul 5, 23:55 UTC25m
2026-07-05 CCA110 - Jul 5, 09:55 UTCJul 5, 10:10 UTC15m
2026-07-05 CCA109 - Jul 5, 04:50 UTCJul 5, 08:10 UTC3h 20m
2026-07-04 CCA1714 - Jul 4, 07:50 UTCJul 4, 08:05 UTC15m
2026-07-04 CCA1238 - Jul 4, 05:25 UTCJul 4, 05:45 UTC20m
2026-07-03 CCA1237 PEK → HMI Jul 3, 22:35 UTCJul 3, 22:55 UTC20m
2026-07-03 CCA1859 - Jul 3, 12:45 UTCJul 3, 12:55 UTC10m
2026-07-03 CCA1712 - Jul 3, 04:30 UTCJul 3, 04:45 UTC15m
2026-07-02 CCA1801 - Jul 2, 13:05 UTCJul 2, 13:15 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-32A2 page for operator, model, and routing details .

Mode-S 781DD7 frequently asked

What is Mode-S code 781DD7?
781DD7 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32A2.
Where is Mode-S 781DD7 registered?
Mode-S code 781DD7 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781DD7 broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781DD7, octal 36016727, decimal 7,871,959.
What flights does 781DD7 operate?
Mode-S 781DD7 has broadcast 20 distinct callsigns, including CCA414, CCA413, CCA1353, CCA4182, CCA4116.