Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
No current signal · last broadcast 7h ago
Flights observed
46
Distinct callsigns
20
Country
CN
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 781DD6.

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
CCA811 Air China 3 2026-06-12
CCA1801 Air China 3 2026-06-12
CCA1737 Air China 3 2026-05-31
CCA1712 Air China 3 2026-06-13
CCA1691 Air China 3 2026-06-11
CCA1738 Air China 2 2026-05-13
CCA1734 Air China 2 2026-05-27
CCA1733 Air China 2 2026-05-27
CCA742 Air China 1 2026-06-06
CCA741 Air China 1 2026-06-06
CCA4324 Air China 1 2026-04-30
CCA4108 Air China 1 2026-05-04
CCA1931 Air China 1 2026-06-02
CCA1908 Air China 1 2026-06-13
CCA1871 Air China 1 2026-06-11
CCA1849 Air China 1 2026-06-08
CCA1807 Air China 1 2026-06-07
CCA1789 Air China 1 2026-05-15
CCA1736 Air China 1 2026-05-05
CCA1735 Air China 1 2026-05-05

Recent flights last 46

DateFlightRouteTakeoffLandingDuration
2026-06-19 CCA1693 PEK → JMU Jun 19, 12:49 UTCJun 19, 12:59 UTC10m
2026-06-13 CCA1908 ZUH → PEK Jun 13, 23:40 UTCJun 13, 23:55 UTC15m
2026-06-13 CCA1712 PEK → HGH Jun 13, 03:50 UTCJun 13, 04:05 UTC15m
2026-06-12 CCA1801 PEK → XMN Jun 12, 12:50 UTCJun 12, 13:00 UTC10m
2026-06-12 CCA811 PEK → VVO Jun 12, 05:10 UTCJun 12, 05:20 UTC10m
2026-06-11 CCA1691 PEK → JMU Jun 11, 22:35 UTCJun 11, 22:45 UTC10m
2026-06-11 CCA1871 PEK → XMN Jun 11, 07:15 UTCJun 11, 07:25 UTC10m
2026-06-11 CCA1238 HMI → PEK Jun 11, 05:10 UTCJun 11, 05:30 UTC20m
2026-06-10 CCA1237 PEK → HMI Jun 10, 22:30 UTCJun 10, 22:50 UTC20m
2026-06-10 CCA1129 PEK → HLD Jun 10, 12:25 UTCJun 10, 12:40 UTC15m
2026-06-10 CCA1712 PEK → HGH Jun 10, 03:45 UTCJun 10, 04:00 UTC15m
2026-06-09 CCA1801 PEK → XMN Jun 9, 12:40 UTCJun 9, 12:50 UTC10m
2026-06-09 CCA811 PEK → VVO Jun 9, 05:40 UTCJun 9, 05:50 UTC10m
2026-06-08 CCA1691 PEK → JMU Jun 8, 22:45 UTCJun 8, 22:55 UTC10m
2026-06-08 CCA1849 PEK → NGB Jun 8, 12:00 UTCJun 8, 12:15 UTC15m
2026-06-08 CCA1511 PEK → KHN Jun 8, 04:45 UTCJun 8, 04:55 UTC10m
2026-06-07 CCA1807 PEK → FOC Jun 7, 10:55 UTCJun 7, 11:10 UTC15m
2026-06-06 CCA1369 PEK → SYX Jun 6, 23:30 UTCJun 7, 06:10 UTC6h 40m
2026-06-06 CCA742 HAN → PEK Jun 6, 07:50 UTCJun 6, 08:10 UTC20m
2026-06-06 CCA741 PEK → HAN Jun 6, 01:25 UTCJun 6, 05:00 UTC3h 35m
2026-06-05 CCA1635 PEK → SHE Jun 5, 11:15 UTCJun 5, 11:25 UTC10m
2026-06-05 CCA1712 PEK → HGH Jun 5, 03:40 UTCJun 5, 03:50 UTC10m
2026-06-04 CCA1801 PEK → XMN Jun 4, 12:45 UTCJun 4, 13:00 UTC15m
2026-06-04 CCA811 PEK → VVO Jun 4, 05:25 UTCJun 4, 05:35 UTC10m
2026-06-03 CCA1691 PEK → JMU Jun 3, 22:35 UTCJun 3, 22:45 UTC10m
2026-06-03 CCA1371 TSN → SZX Jun 3, 04:55 UTCJun 3, 10:50 UTC5h 55m
2026-06-02 CCA1931 PEK → NNG Jun 2, 12:05 UTCJun 2, 12:25 UTC20m
2026-06-01 CCA134 HND → PEK Jun 1, 07:25 UTCJun 1, 09:30 UTC2h 5m
2026-06-01 CCA133 PEK → HND Jun 1, 03:00 UTCJun 1, 04:55 UTC1h 55m
2026-05-31 CCA1737 HGH → SZX May 31, 00:35 UTCMay 31, 01:11 UTC36m
2026-05-27 CCA1734 SZX → HGH May 27, 12:10 UTCMay 27, 12:20 UTC10m
2026-05-27 CCA1733 HGH → SZX May 27, 09:50 UTCMay 27, 10:10 UTC20m
2026-05-26 - - May 26, 05:20 UTCMay 26, 05:30 UTC10m
2026-05-15 CCA1789 HGH → CAN May 15, 01:00 UTCMay 15, 01:10 UTC10m
2026-05-14 - - May 14, 04:50 UTCMay 14, 04:55 UTC5m
2026-05-13 CCA1738 SZX → HGH May 13, 03:05 UTCMay 13, 03:20 UTC15m
2026-05-13 CCA1737 HGH → SZX May 13, 01:20 UTCMay 13, 01:45 UTC25m
2026-05-06 CCA1734 SZX → HGH May 6, 10:10 UTCMay 6, 10:20 UTC10m
2026-05-06 CCA1733 HGH → SZX May 6, 07:45 UTCMay 6, 08:10 UTC25m
2026-05-06 CCA1738 SZX → HGH May 6, 03:00 UTCMay 6, 03:10 UTC10m
2026-05-06 CCA1737 HGH → SZX May 6, 01:15 UTCMay 6, 01:25 UTC10m
2026-05-05 CCA1736 SZX → HGH May 5, 15:10 UTCMay 5, 15:20 UTC10m
2026-05-05 CCA1735 HGH → SZX May 5, 12:50 UTCMay 5, 13:10 UTC20m
2026-05-04 CCA1704 PEK → HGH May 4, 23:35 UTCMay 4, 23:45 UTC10m
2026-05-04 CCA4108 PEK → CTU May 4, 06:40 UTCMay 4, 06:55 UTC15m
2026-04-30 CCA4324 SZX → CTU Apr 30, 12:45 UTCApr 30, 13:00 UTC15m

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?
No active broadcast right now. Last signal was 7h ago.
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 CCA811, CCA1801, CCA1737, CCA1712, CCA1691.