Apparatus

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sensors Mode-S transponder

781D7A

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-328X · AIRBUS A-321neo

Hex
781D7A
Octal
36016572
Decimal
7,871,866
Country
CN
Tail
B-328X
Type
A21N
No current signal · last broadcast Jul 25, 06:10 UTC
Flights observed
177
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 06:10 UTC

Last known position

Most recent position reported by Mode-S 781D7A.

Country allocation

The ICAO 24-bit address 781D7A 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
CDC8231 - 42 2026-07-23
CDC8899 Zhejiang Loong Airlines 17 2026-07-25
CDC8627 Zhejiang Loong Airlines 17 2026-07-24
CDC8900 Zhejiang Loong Airlines 13 2026-07-24
CDC8888 - 13 2026-07-12
CDC8628 Zhejiang Loong Airlines 13 2026-07-24
CDC8965 - 10 2026-07-03
CDC8232 - 10 2026-07-09
CDC8966 - 9 2026-07-03
CDC8988 - 8 2026-07-13
CDC8199 Zhejiang Loong Airlines 8 2026-07-25
CDC8200 - 5 2026-07-07
CDC8995 Zhejiang Loong Airlines 2 2026-04-25
CDC8630 - 2 2026-07-21
CDC8629 - 2 2026-07-21
CDC8996 Zhejiang Loong Airlines 1 2026-05-26
CDC8989 - 1 2026-04-16
CDC8788 - 1 2026-04-18
CDC873R - 1 2026-05-21
CDC8738 Zhejiang Loong Airlines 1 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CDC8199 HGH → SYX Jul 25, 06:00 UTCJul 25, 06:10 UTC10m
2026-07-25 CDC8899 SZX → HGH Jul 25, 01:30 UTCJul 25, 01:40 UTC10m
2026-07-24 CDC8627 HGH → SZX Jul 24, 23:25 UTCJul 25, 00:05 UTC40m
2026-07-24 CDC8628 SZX → HGH Jul 24, 17:10 UTCJul 24, 17:20 UTC10m
2026-07-24 CDC8900 HGH → SZX Jul 24, 06:15 UTCJul 24, 15:45 UTC9h 30m
2026-07-24 CDC8899 SZX → HGH Jul 24, 01:50 UTCJul 24, 02:00 UTC10m
2026-07-23 CDC8627 HGH → SZX Jul 23, 23:55 UTCJul 24, 00:15 UTC20m
2026-07-23 CDC8231 HRB → HGH Jul 23, 04:40 UTCJul 23, 22:50 UTC18h 10m
2026-07-23 CDC8231 HRB → HGH Jul 23, 00:35 UTCJul 23, 22:50 UTC22h 15m
2026-07-23 CDC8231 - Jul 23, 00:00 UTCJul 23, 08:35 UTC8h 35m
2026-07-22 CDC8231 - Jul 22, 14:05 UTCJul 23, 08:35 UTC18h 30m
2026-07-21 CDC8630 - Jul 21, 12:10 UTCJul 21, 12:20 UTC10m
2026-07-21 CDC8629 - Jul 21, 10:00 UTCJul 21, 10:10 UTC10m
2026-07-19 CDC8231 - Jul 19, 23:40 UTCJul 20, 09:05 UTC9h 25m
2026-07-19 CDC8231 - Jul 19, 04:35 UTCJul 20, 00:20 UTC19h 45m
2026-07-18 CDC8231 - Jul 18, 23:30 UTCJul 19, 08:50 UTC9h 20m
2026-07-18 CDC8231 - Jul 18, 08:45 UTCJul 19, 05:00 UTC20h 15m
2026-07-18 CDC8231 - Jul 18, 04:45 UTCJul 19, 00:15 UTC19h 30m
2026-07-17 CDC8231 - Jul 17, 23:45 UTCJul 18, 08:45 UTC9h 1m
2026-07-17 CDC8231 - Jul 17, 13:20 UTCJul 18, 08:45 UTC19h 26m
2026-07-17 CDC8231 - Jul 17, 08:25 UTCJul 18, 05:05 UTC20h 41m
2026-07-17 CDC8231 - Jul 17, 04:35 UTCJul 18, 00:25 UTC19h 50m
2026-07-17 CDC8231 - Jul 17, 04:10 UTCJul 18, 00:25 UTC20h 15m
2026-07-16 CDC8231 - Jul 16, 23:25 UTCJul 17, 13:20 UTC13h 55m
2026-07-16 CDC8231 - Jul 16, 13:10 UTCJul 17, 08:25 UTC19h 15m
2026-07-16 CDC8231 - Jul 16, 08:45 UTCJul 17, 08:25 UTC23h 40m
2026-07-16 CDC8231 - Jul 16, 04:45 UTCJul 17, 04:25 UTC23h 40m
2026-07-15 CDC8231 - Jul 15, 23:35 UTCJul 16, 13:10 UTC13h 35m
2026-07-15 CDC8231 - Jul 15, 13:25 UTCJul 16, 08:55 UTC19h 30m
2026-07-15 CDC8231 - Jul 15, 08:40 UTCJul 16, 05:05 UTC20h 25m
2026-07-15 CDC8231 - Jul 15, 05:15 UTCJul 16, 00:20 UTC19h 5m
2026-07-14 CDC8231 - Jul 14, 23:25 UTCJul 15, 13:25 UTC14h 0m
2026-07-13 CDC8988 - Jul 13, 11:55 UTCJul 13, 12:05 UTC10m
2026-07-12 CDC8988 - Jul 12, 14:30 UTCJul 12, 14:40 UTC10m
2026-07-12 CDC8888 - Jul 12, 07:20 UTCJul 12, 07:31 UTC10m
2026-07-11 CDC8888 - Jul 11, 03:05 UTCJul 11, 03:20 UTC15m
2026-07-10 CDC8628 - Jul 10, 17:10 UTCJul 10, 17:25 UTC15m
2026-07-10 CDC8199 - Jul 10, 07:10 UTCJul 10, 15:35 UTC8h 25m
2026-07-10 CDC8899 - Jul 10, 02:40 UTCJul 10, 02:55 UTC15m
2026-07-09 CDC8627 - Jul 9, 23:10 UTCJul 10, 00:00 UTC50m
2026-07-09 CDC8232 - Jul 9, 04:50 UTCJul 9, 08:50 UTC4h 0m
2026-07-08 CDC8628 SZX → HGH Jul 8, 17:40 UTCJul 8, 17:55 UTC15m
2026-07-08 CDC8900 HGH → SZX Jul 8, 10:10 UTCJul 8, 15:55 UTC5h 45m
2026-07-07 CDC8200 - Jul 7, 11:15 UTCJul 8, 06:15 UTC19h 0m
2026-07-07 CDC8199 - Jul 7, 07:20 UTCJul 8, 06:15 UTC22h 55m
2026-07-07 CDC8899 - Jul 7, 03:25 UTCJul 7, 03:40 UTC15m
2026-07-07 CDC8627 HGH → SZX Jul 7, 00:10 UTCJul 7, 00:20 UTC10m
2026-07-06 CDC8988 - Jul 6, 12:05 UTCJul 6, 12:20 UTC15m
2026-07-06 CDC8888 - Jul 6, 03:10 UTCJul 6, 03:20 UTC10m
2026-07-05 CDC8888 - Jul 5, 03:05 UTCJul 5, 03:15 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-328X page for operator, model, and routing details .

Mode-S 781D7A frequently asked

What is Mode-S code 781D7A?
781D7A is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-328X.
Where is Mode-S 781D7A registered?
Mode-S code 781D7A is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781D7A broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 06:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781D7A, octal 36016572, decimal 7,871,866.
What flights does 781D7A operate?
Mode-S 781D7A has broadcast 20 distinct callsigns, including CDC8231, CDC8899, CDC8627, CDC8900, CDC8888.