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sensors Mode-S transponder

781DD6

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32A1 · AIRBUS A-321neo

Hex
781DD6
Octal
36016726
Decimal
7,871,958
Country
CN
Tail
B-32A1
Type
A21N
Broadcasting now · callsign CCA1525 · 20,700 ft
Flights observed
111
Distinct callsigns
20
Country
CN
Last broadcast
8d ago

Current position

781DD6 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 781DD6 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
CCA742 Air China 7 2026-07-23
CCA811 - 5 2026-06-26
CCA741 Air China 4 2026-07-23
CCA1691 Air China 4 2026-06-27
CCA1801 Air China 3 2026-06-12
CCA1737 Air China 3 2026-05-31
CCA1712 Air China 3 2026-06-13
CCA133 - 3 2026-07-16
CCA109 Air China 3 2026-07-24
CCA1931 Air China 2 2026-07-23
CCA1845 - 2 2026-06-26
CCA1807 - 2 2026-06-20
CCA1738 Air China 2 2026-05-13
CCA1734 Air China 2 2026-05-27
CCA1733 Air China 2 2026-05-27
CCA1704 - 2 2026-07-08
CCA1693 Air China 2 2026-07-22
CCA1539 - 2 2026-07-18
CCA134 - 2 2026-07-16
CCA1285 - 2 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA4103 CTU → PEK Jul 26, 08:40 UTCJul 26, 08:50 UTC10m
2026-07-25 CCA4104 PEK → CTU Jul 25, 11:00 UTCJul 25, 11:15 UTC15m
2026-07-25 CCA1210 XIY → PEK Jul 25, 07:45 UTCJul 25, 08:20 UTC35m
2026-07-25 CCA1209 PEK → XIY Jul 25, 03:55 UTCJul 25, 04:20 UTC25m
2026-07-25 CCA1916 CGO → PEK Jul 25, 01:40 UTCJul 25, 02:10 UTC30m
2026-07-24 CCA1915 PEK → CGO Jul 24, 14:55 UTCJul 24, 15:25 UTC30m
2026-07-24 CCA110 HKG → PEK Jul 24, 10:20 UTCJul 24, 12:55 UTC2h 35m
2026-07-24 CCA109 PEK → HKG Jul 24, 05:25 UTCJul 24, 08:35 UTC3h 10m
2026-07-23 CCA1931 PEK → NNG Jul 23, 12:20 UTCJul 23, 12:35 UTC15m
2026-07-23 CCA742 HAN → PEK Jul 23, 09:35 UTCJul 23, 09:45 UTC10m
2026-07-23 CCA742 HAN → PEK Jul 23, 06:35 UTCJul 23, 06:55 UTC20m
2026-07-23 CCA741 PEK → HAN Jul 23, 01:10 UTCJul 23, 01:30 UTC20m
2026-07-22 CCA1693 PEK → JMU Jul 22, 12:40 UTCJul 22, 12:50 UTC10m
2026-07-22 CCA1285 - Jul 22, 03:55 UTCJul 22, 04:05 UTC10m
2026-07-21 CCA1710 PEK → HGH Jul 21, 02:45 UTCJul 21, 03:00 UTC15m
2026-07-20 CCA9844 - Jul 20, 04:55 UTCJul 20, 05:15 UTC20m
2026-07-19 CCA9843 - Jul 19, 22:55 UTCJul 19, 23:15 UTC20m
2026-07-19 CCA110 - Jul 19, 10:00 UTCJul 19, 10:15 UTC15m
2026-07-19 CCA109 PEK → HKG Jul 19, 07:45 UTCJul 19, 08:15 UTC30m
2026-07-19 CCA109 PEK → HKG Jul 19, 05:20 UTCJul 19, 05:30 UTC10m
2026-07-18 CCA1539 - Jul 18, 12:20 UTCJul 18, 12:35 UTC15m
2026-07-18 CCA742 - Jul 18, 09:50 UTCJul 18, 10:00 UTC10m
2026-07-18 CCA742 - Jul 18, 06:40 UTCJul 18, 07:00 UTC20m
2026-07-18 CCA741 PEK → HAN Jul 18, 01:25 UTCJul 18, 04:30 UTC3h 6m
2026-07-17 CCA809 - Jul 17, 03:55 UTCJul 17, 04:04 UTC10m
2026-07-16 CCA134 - Jul 16, 07:30 UTCJul 16, 09:35 UTC2h 5m
2026-07-16 CCA133 - Jul 16, 03:20 UTCJul 16, 05:25 UTC2h 5m
2026-07-16 CCA133 - Jul 16, 02:25 UTCJul 16, 02:35 UTC10m
2026-07-15 CCA1443 - Jul 15, 10:45 UTCJul 15, 11:00 UTC15m
2026-07-15 CCA1434 - Jul 15, 08:25 UTCJul 15, 08:35 UTC10m
2026-07-14 CCA1433 - Jul 14, 01:55 UTCJul 14, 02:15 UTC20m
2026-07-13 CCA1959 - Jul 13, 02:40 UTCJul 13, 03:05 UTC25m
2026-07-12 CCA1525 - Jul 12, 12:35 UTCJul 12, 12:45 UTC10m
2026-07-12 CCA1286 - Jul 12, 10:15 UTCJul 12, 10:35 UTC20m
2026-07-12 CCA1285 - Jul 12, 04:01 UTCJul 12, 04:25 UTC25m
2026-07-11 CCA742 - Jul 11, 10:05 UTCJul 11, 10:15 UTC10m
2026-07-11 CCA742 - Jul 11, 07:10 UTCJul 11, 07:20 UTC10m
2026-07-11 CCA741 - Jul 11, 01:25 UTCJul 11, 01:45 UTC20m
2026-07-10 CCA1353 - Jul 10, 07:05 UTCJul 10, 07:25 UTC20m
2026-07-09 CCA1343 - Jul 9, 23:05 UTCJul 9, 23:25 UTC20m
2026-07-08 CCA1704 - Jul 8, 23:35 UTCJul 8, 23:45 UTC10m
2026-07-06 CCA4338 - Jul 6, 04:00 UTCJul 6, 04:10 UTC10m
2026-07-06 CCA4337 - Jul 6, 01:30 UTCJul 6, 01:40 UTC10m
2026-07-01 CCA1587 - Jul 1, 23:20 UTCJul 1, 23:30 UTC10m
2026-07-01 CCA1395 TSN → CAN Jul 1, 11:10 UTCJul 1, 11:20 UTC10m
2026-06-30 CCA1513 - Jun 30, 07:25 UTCJun 30, 07:40 UTC15m
2026-06-30 CCA1238 - Jun 30, 05:20 UTCJun 30, 05:45 UTC25m
2026-06-29 CCA1237 PEK → HMI Jun 29, 22:24 UTCJun 29, 22:44 UTC20m
2026-06-29 CCA1254 - Jun 29, 11:45 UTCJun 29, 12:00 UTC15m
2026-06-29 CCA1253 - Jun 29, 02:50 UTCJun 29, 03:10 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-32A1 page for operator, model, and routing details .

Mode-S 781DD6 frequently asked

What is Mode-S code 781DD6?
781DD6 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32A1.
Where is Mode-S 781DD6 registered?
Mode-S code 781DD6 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781DD6 broadcasting right now?
Yes. Mode-S 781DD6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781DD6, octal 36016726, decimal 7,871,958.
What flights does 781DD6 operate?
Mode-S 781DD6 has broadcast 20 distinct callsigns, including CCA742, CCA811, CCA741, CCA1691, CCA1801.