Apparatus

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sensors Mode-S transponder

781C53

ICAO 24-bit transponder address · allocated to China

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

Hex
781C53
Octal
36016123
Decimal
7,871,571
Country
CN
Tail
B-325X
Type
A21N
No current signal · last broadcast 22h ago
Flights observed
111
Distinct callsigns
20
Country
CN
Last broadcast
22h ago

Last known position

Most recent position reported by Mode-S 781C53.

Country allocation

The ICAO 24-bit address 781C53 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
CDC8630 - 19 2026-05-27
CDC8629 - 13 2026-05-26
CDC8738 - 11 2026-07-06
CDC8788 - 10 2026-07-06
CDC8737 - 10 2026-07-14
CDC8231 Zhejiang Loong Airlines 9 2026-05-27
CDC8787 - 8 2026-07-14
CDC8859 - 6 2026-07-11
CDC8206 - 6 2026-07-14
CDC8989 - 2 2026-06-26
CDC8965 - 2 2026-07-17
CDC8699 Zhejiang Loong Airlines 2 2026-04-18
CDC8286 - 2 2026-07-16
CDC8285 - 2 2026-07-08
CDC8995 Zhejiang Loong Airlines 1 2026-07-17
CDC8990 - 1 2026-07-05
CDC8988 Zhejiang Loong Airlines 1 2026-06-09
CDC8966 - 1 2026-07-17
CDC8888 Zhejiang Loong Airlines 1 2026-06-09
CDC8060 - 1 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CDC8995 HGH → CAN Jul 17, 12:04 UTCJul 17, 12:15 UTC10m
2026-07-17 CDC8966 - Jul 17, 06:10 UTCJul 17, 06:25 UTC15m
2026-07-17 CDC8965 - Jul 17, 03:50 UTCJul 17, 04:35 UTC45m
2026-07-16 CDC8286 - Jul 16, 12:44 UTCJul 16, 12:55 UTC10m
2026-07-15 - - Jul 15, 11:00 UTCJul 15, 11:10 UTC10m
2026-07-14 CDC8206 - Jul 14, 12:15 UTCJul 14, 12:55 UTC40m
2026-07-14 CDC8787 - Jul 14, 04:40 UTCJul 14, 04:50 UTC10m
2026-07-14 CDC8737 - Jul 14, 02:35 UTCJul 14, 03:15 UTC40m
2026-07-13 CDC8060 - Jul 13, 10:30 UTCJul 13, 10:45 UTC15m
2026-07-11 CDC8859 - Jul 11, 08:45 UTCJul 11, 08:55 UTC10m
2026-07-10 CDC8206 - Jul 10, 12:45 UTCJul 10, 13:30 UTC45m
2026-07-10 CDC8787 - Jul 10, 05:05 UTCJul 10, 05:20 UTC15m
2026-07-10 CDC8737 - Jul 10, 03:00 UTCJul 10, 03:40 UTC40m
2026-07-08 CDC8285 - Jul 8, 17:55 UTCJul 8, 18:20 UTC25m
2026-07-08 CDC8859 - Jul 8, 11:05 UTCJul 8, 11:45 UTC40m
2026-07-06 CDC8738 - Jul 6, 15:00 UTCJul 6, 15:15 UTC15m
2026-07-06 CDC8788 - Jul 6, 12:45 UTCJul 6, 13:05 UTC20m
2026-07-05 CDC8990 - Jul 5, 02:10 UTCJul 5, 02:20 UTC10m
2026-07-04 CDC8206 - Jul 4, 11:45 UTCJul 4, 15:40 UTC3h 55m
2026-07-04 CDC8787 - Jul 4, 07:10 UTCJul 4, 07:25 UTC15m
2026-07-04 CDC8737 - Jul 4, 05:00 UTCJul 4, 05:10 UTC10m
2026-07-03 CDC8738 - Jul 3, 17:20 UTCJul 3, 17:35 UTC15m
2026-07-03 CDC8788 - Jul 3, 13:15 UTCJul 3, 13:45 UTC30m
2026-07-02 CDC8206 - Jul 2, 13:30 UTCJul 2, 14:00 UTC30m
2026-07-02 CDC8787 - Jul 2, 05:50 UTCJul 2, 06:00 UTC10m
2026-07-02 CDC8737 - Jul 2, 02:40 UTCJul 2, 03:00 UTC20m
2026-06-30 CDC8738 - Jun 30, 16:05 UTCJun 30, 16:15 UTC10m
2026-06-30 CDC8788 - Jun 30, 14:25 UTCJun 30, 14:50 UTC25m
2026-06-29 CDC8206 - Jun 29, 11:45 UTCJun 29, 12:20 UTC35m
2026-06-29 CDC8737 - Jun 29, 02:30 UTCJun 29, 02:50 UTC20m
2026-06-28 CDC8787 - Jun 28, 09:55 UTCJun 28, 13:14 UTC3h 20m
2026-06-28 CDC8737 - Jun 28, 03:00 UTCJun 28, 03:14 UTC15m
2026-06-27 CDC8738 - Jun 27, 16:39 UTCJun 27, 16:49 UTC10m
2026-06-27 CDC8788 - Jun 27, 13:44 UTCJun 27, 14:00 UTC15m
2026-06-26 CDC8989 - Jun 26, 19:35 UTCJun 26, 19:45 UTC10m
2026-06-26 CDC8054 - Jun 26, 12:50 UTCJun 26, 13:55 UTC1h 5m
2026-06-26 CDC8053 - Jun 26, 07:45 UTCJun 26, 08:24 UTC40m
2026-06-24 CDC8787 - Jun 24, 05:29 UTCJun 24, 05:40 UTC10m
2026-06-24 CDC8737 - Jun 24, 03:15 UTCJun 24, 03:35 UTC20m
2026-06-19 CDC8859 - Jun 19, 08:50 UTCJun 19, 09:04 UTC15m
2026-06-16 CDC8738 SZX → HGH Jun 16, 16:15 UTCJun 16, 16:25 UTC10m
2026-06-16 CDC8788 - Jun 16, 13:34 UTCJun 16, 13:55 UTC20m
2026-06-15 CDC8206 HRB → HGH Jun 15, 15:35 UTCJun 15, 16:04 UTC30m
2026-06-15 CDC8787 - Jun 15, 08:00 UTCJun 15, 08:15 UTC15m
2026-06-15 CDC8737 - Jun 15, 03:00 UTCJun 15, 03:10 UTC10m
2026-06-14 CDC8738 SZX → HGH Jun 14, 16:20 UTCJun 14, 16:30 UTC10m
2026-06-14 CDC8788 - Jun 14, 13:40 UTCJun 14, 13:50 UTC10m
2026-06-13 CDC8788 - Jun 13, 12:55 UTCJun 13, 13:05 UTC10m
2026-06-09 CDC8988 PEK → HGH Jun 9, 11:50 UTCJun 9, 12:05 UTC15m
2026-06-09 CDC8888 PEK → HGH Jun 9, 03:00 UTCJun 9, 03:10 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-325X page for operator, model, and routing details .

Mode-S 781C53 frequently asked

What is Mode-S code 781C53?
781C53 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-325X.
Where is Mode-S 781C53 registered?
Mode-S code 781C53 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781C53 broadcasting right now?
No active broadcast right now. Last signal was 22h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781C53, octal 36016123, decimal 7,871,571.
What flights does 781C53 operate?
Mode-S 781C53 has broadcast 20 distinct callsigns, including CDC8630, CDC8629, CDC8738, CDC8788, CDC8737.