Apparatus

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sensors Mode-S transponder

781C31

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-325K · AIRBUS A-321neo

Hex
781C31
Octal
36016061
Decimal
7,871,537
Country
CN
Tail
B-325K
Type
A21N
No current signal · last broadcast 1d ago
Flights observed
75
Distinct callsigns
17
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 781C31.

Country allocation

The ICAO 24-bit address 781C31 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 17 distinct

Callsign Airline Flights Last seen
CDC8787 - 14 2026-07-16
CDC8737 - 14 2026-07-16
CDC8738 - 9 2026-07-12
CDC8206 - 8 2026-07-16
CDC8788 - 6 2026-07-12
CDC8630 - 5 2026-04-18
CDC8629 - 4 2026-04-18
CDC8859 Zhejiang Loong Airlines 2 2026-05-30
CDC8699 - 2 2026-07-14
CDC8008 - 2 2026-07-02
CDC8007 - 2 2026-07-02
CDC8992 Zhejiang Loong Airlines 1 2026-04-24
CDC8989 Zhejiang Loong Airlines 1 2026-05-05
CDC8988 Zhejiang Loong Airlines 1 2026-06-08
CDC8700 Zhejiang Loong Airlines 1 2026-04-26
CDC8231 Zhejiang Loong Airlines 1 2026-04-18
CDC8168 - 1 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 CDC8206 - Jul 16, 09:45 UTCJul 16, 13:54 UTC4h 10m
2026-07-16 CDC8787 - Jul 16, 04:40 UTCJul 16, 04:50 UTC10m
2026-07-16 CDC8737 - Jul 16, 02:10 UTCJul 16, 02:50 UTC40m
2026-07-14 CDC8699 - Jul 14, 05:15 UTCJul 14, 05:25 UTC10m
2026-07-13 CDC8699 - Jul 13, 04:10 UTCJul 13, 04:55 UTC45m
2026-07-12 CDC8738 - Jul 12, 14:50 UTCJul 12, 15:01 UTC10m
2026-07-12 CDC8788 - Jul 12, 12:30 UTCJul 12, 12:40 UTC10m
2026-07-11 CDC8787 - Jul 11, 04:30 UTCJul 11, 04:40 UTC10m
2026-07-11 CDC8737 - Jul 11, 02:05 UTCJul 11, 03:01 UTC55m
2026-07-05 CDC8168 - Jul 5, 06:50 UTCJul 5, 07:25 UTC35m
2026-07-02 CDC8008 - Jul 2, 06:20 UTCJul 2, 06:35 UTC15m
2026-07-02 CDC8007 - Jul 2, 04:10 UTCJul 2, 04:30 UTC20m
2026-06-26 CDC8206 - Jun 26, 12:14 UTCJun 26, 12:55 UTC40m
2026-06-21 CDC8206 - Jun 21, 08:30 UTCJun 21, 12:35 UTC4h 5m
2026-06-21 CDC8787 - Jun 21, 04:20 UTCJun 21, 04:30 UTC10m
2026-06-21 CDC8737 - Jun 21, 02:35 UTCJun 21, 02:50 UTC15m
2026-06-20 CDC8788 - Jun 20, 12:34 UTCJun 20, 12:45 UTC10m
2026-06-17 CDC8206 HRB → HGH Jun 17, 14:10 UTCJun 17, 14:55 UTC45m
2026-06-17 CDC8787 - Jun 17, 06:35 UTCJun 17, 06:45 UTC10m
2026-06-17 CDC8737 - Jun 17, 04:40 UTCJun 17, 05:00 UTC20m
2026-06-16 CDC8787 - Jun 16, 05:20 UTCJun 16, 05:30 UTC10m
2026-06-16 CDC8737 - Jun 16, 03:04 UTCJun 16, 03:35 UTC30m
2026-06-14 CDC8787 - Jun 14, 06:35 UTCJun 14, 07:00 UTC25m
2026-06-14 CDC8737 - Jun 14, 03:00 UTCJun 14, 03:10 UTC10m
2026-06-11 CDC8787 - Jun 11, 04:40 UTCJun 11, 04:50 UTC10m
2026-06-11 CDC8737 HGH → SZX Jun 11, 02:15 UTCJun 11, 03:05 UTC50m
2026-06-09 CDC8738 SZX → HGH Jun 9, 15:35 UTCJun 9, 15:45 UTC10m
2026-06-08 CDC8988 PEK → HGH Jun 8, 13:55 UTCJun 8, 14:10 UTC15m
2026-06-03 CDC8738 SZX → HGH Jun 3, 14:35 UTCJun 3, 14:50 UTC15m
2026-06-03 CDC8788 - Jun 3, 13:00 UTCJun 3, 13:20 UTC20m
2026-05-30 CDC8859 HGH → CAN May 30, 08:10 UTCMay 30, 09:05 UTC55m
2026-05-29 CDC8738 SZX → HGH May 29, 17:05 UTCMay 29, 17:20 UTC15m
2026-05-27 CDC8738 SZX → HGH May 27, 14:35 UTCMay 27, 14:45 UTC10m
2026-05-24 CDC8738 SZX → HGH May 24, 16:20 UTCMay 24, 16:35 UTC15m
2026-05-20 CDC8206 HRB → HGH May 20, 12:55 UTCMay 20, 13:40 UTC45m
2026-05-20 CDC8787 - May 20, 05:25 UTCMay 20, 05:35 UTC10m
2026-05-20 CDC8737 HGH → SZX May 20, 02:50 UTCMay 20, 03:10 UTC20m
2026-05-19 CDC8206 HRB → HGH May 19, 12:00 UTCMay 19, 12:10 UTC10m
2026-05-19 CDC8787 - May 19, 04:50 UTCMay 19, 05:05 UTC15m
2026-05-19 CDC8737 HGH → SZX May 19, 02:45 UTCMay 19, 03:05 UTC20m
2026-05-16 CDC8738 SZX → HGH May 16, 14:46 UTCMay 16, 14:55 UTC10m
2026-05-16 CDC8788 - May 16, 12:35 UTCMay 16, 12:45 UTC10m
2026-05-15 CDC8738 SZX → HGH May 15, 15:40 UTCMay 15, 15:50 UTC10m
2026-05-13 CDC8206 HRB → HGH May 13, 12:10 UTCMay 13, 13:00 UTC50m
2026-05-13 CDC8787 - May 13, 04:40 UTCMay 13, 04:55 UTC15m
2026-05-13 CDC8737 HGH → SZX May 13, 02:50 UTCMay 13, 03:10 UTC20m
2026-05-10 CDC8738 SZX → HGH May 10, 14:40 UTCMay 10, 14:49 UTC10m
2026-05-10 CDC8788 - May 10, 12:34 UTCMay 10, 12:54 UTC20m
2026-05-08 CDC8859 HGH → CAN May 8, 09:25 UTCMay 8, 09:34 UTC10m
2026-05-07 CDC8787 - May 7, 04:35 UTCMay 7, 04:50 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-325K page for operator, model, and routing details .

Mode-S 781C31 frequently asked

What is Mode-S code 781C31?
781C31 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-325K.
Where is Mode-S 781C31 registered?
Mode-S code 781C31 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781C31 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781C31, octal 36016061, decimal 7,871,537.
What flights does 781C31 operate?
Mode-S 781C31 has broadcast 17 distinct callsigns, including CDC8787, CDC8737, CDC8738, CDC8206, CDC8788.