Apparatus

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sensors Mode-S transponder

7815B4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-304Y · AIRBUS A-320neo

Hex
7815B4
Octal
36012664
Decimal
7,869,876
Country
CN
Tail
B-304Y
Type
A20N
No current signal · last broadcast 15h ago
Flights observed
58
Distinct callsigns
9
Country
CN
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 7815B4.

Country allocation

The ICAO 24-bit address 7815B4 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 9 distinct

Callsign Airline Flights Last seen
CDC8684 Zhejiang Loong Airlines 20 2026-05-14
CDC8683 Zhejiang Loong Airlines 20 2026-05-14
CDC8656 - 5 2026-06-02
CDC8655 - 5 2026-06-02
CDC8998 Zhejiang Loong Airlines 2 2026-04-16
CDC8597 - 2 2026-05-16
CDC8590 - 2 2026-04-23
CDC8997 Zhejiang Loong Airlines 1 2026-04-16
CDC8598 - 1 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 CDC8656 - Jun 2, 10:20 UTCJun 2, 10:40 UTC20m
2026-06-02 CDC8656 - Jun 2, 06:10 UTCJun 2, 06:20 UTC10m
2026-06-02 CDC8655 - Jun 2, 04:20 UTCJun 2, 04:40 UTC20m
2026-05-20 CDC8656 - May 20, 12:45 UTCMay 20, 13:00 UTC15m
2026-05-20 CDC8656 - May 20, 09:00 UTCMay 20, 09:10 UTC10m
2026-05-20 CDC8655 - May 20, 06:30 UTCMay 20, 06:50 UTC20m
2026-05-19 CDC8655 - May 19, 12:05 UTCMay 20, 02:00 UTC13h 55m
2026-05-19 CDC8656 - May 19, 08:15 UTCMay 19, 08:25 UTC10m
2026-05-19 CDC8655 - May 19, 06:30 UTCMay 19, 06:55 UTC25m
2026-05-19 CDC8655 - May 19, 01:45 UTCMay 19, 02:35 UTC50m
2026-05-17 CDC8598 - May 17, 04:00 UTCMay 17, 13:01 UTC9h 0m
2026-05-16 CDC8597 - May 16, 11:01 UTCMay 17, 04:15 UTC17h 15m
2026-05-14 CDC8683 SZX → ENH May 14, 23:25 UTCMay 14, 23:40 UTC15m
2026-05-14 CDC8684 ENH → SZX May 14, 16:20 UTCMay 14, 16:30 UTC10m
2026-05-13 CDC8683 SZX → ENH May 13, 22:55 UTCMay 13, 23:10 UTC15m
2026-05-13 CDC8684 ENH → SZX May 13, 17:55 UTCMay 13, 18:25 UTC30m
2026-05-12 CDC8683 SZX → ENH May 12, 23:05 UTCMay 12, 23:20 UTC15m
2026-05-12 CDC8684 ENH → SZX May 12, 16:05 UTCMay 12, 16:30 UTC25m
2026-05-11 CDC8684 ENH → SZX May 11, 16:15 UTCMay 11, 16:30 UTC15m
2026-05-10 CDC8683 SZX → ENH May 10, 23:15 UTCMay 10, 23:29 UTC15m
2026-05-10 CDC8684 ENH → SZX May 10, 16:25 UTCMay 10, 16:40 UTC15m
2026-05-09 CDC8683 SZX → ENH May 9, 23:09 UTCMay 9, 23:25 UTC15m
2026-05-09 CDC8684 ENH → SZX May 9, 16:20 UTCMay 9, 16:40 UTC20m
2026-05-08 CDC8683 SZX → ENH May 8, 22:55 UTCMay 8, 23:10 UTC15m
2026-05-07 CDC8683 SZX → ENH May 7, 22:59 UTCMay 7, 23:14 UTC15m
2026-05-07 CDC8684 ENH → SZX May 7, 16:10 UTCMay 7, 16:35 UTC25m
2026-05-06 CDC8683 SZX → ENH May 6, 23:15 UTCMay 6, 23:25 UTC10m
2026-05-06 CDC8684 ENH → SZX May 6, 16:20 UTCMay 6, 16:40 UTC20m
2026-05-05 CDC8683 SZX → ENH May 5, 23:25 UTCMay 5, 23:40 UTC15m
2026-05-05 CDC8684 ENH → SZX May 5, 16:10 UTCMay 5, 16:35 UTC25m
2026-05-04 CDC8683 SZX → ENH May 4, 22:50 UTCMay 4, 23:00 UTC10m
2026-05-04 CDC8684 ENH → SZX May 4, 17:55 UTCMay 4, 18:10 UTC15m
2026-05-03 CDC8683 SZX → ENH May 3, 23:10 UTCMay 3, 23:20 UTC10m
2026-05-03 CDC8684 ENH → SZX May 3, 16:25 UTCMay 3, 16:55 UTC30m
2026-05-02 CDC8683 SZX → ENH May 2, 23:10 UTCMay 2, 23:25 UTC15m
2026-05-02 CDC8684 ENH → SZX May 2, 16:15 UTCMay 2, 16:25 UTC10m
2026-05-01 CDC8683 SZX → ENH May 1, 23:05 UTCMay 1, 23:20 UTC15m
2026-05-01 CDC8684 ENH → SZX May 1, 16:10 UTCMay 1, 16:35 UTC25m
2026-04-30 CDC8683 SZX → ENH Apr 30, 23:15 UTCApr 30, 23:30 UTC15m
2026-04-30 CDC8684 ENH → SZX Apr 30, 17:45 UTCApr 30, 18:05 UTC20m
2026-04-29 CDC8683 SZX → ENH Apr 29, 23:00 UTCApr 29, 23:10 UTC9m
2026-04-29 CDC8684 ENH → SZX Apr 29, 16:15 UTCApr 29, 16:30 UTC15m
2026-04-28 CDC8683 SZX → ENH Apr 28, 23:20 UTCApr 28, 23:29 UTC10m
2026-04-28 CDC8684 ENH → SZX Apr 28, 19:20 UTCApr 28, 19:40 UTC20m
2026-04-27 CDC8683 SZX → ENH Apr 27, 22:55 UTCApr 27, 23:10 UTC15m
2026-04-27 CDC8684 ENH → SZX Apr 27, 16:55 UTCApr 27, 17:05 UTC10m
2026-04-26 CDC8683 SZX → ENH Apr 26, 23:00 UTCApr 26, 23:15 UTC15m
2026-04-26 CDC8684 ENH → SZX Apr 26, 16:10 UTCApr 26, 16:30 UTC20m
2026-04-25 CDC8683 SZX → ENH Apr 25, 23:15 UTCApr 25, 23:30 UTC15m
2026-04-25 CDC8684 ENH → SZX Apr 25, 16:05 UTCApr 25, 16:35 UTC30m

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-304Y page for operator, model, and routing details .

Mode-S 7815B4 frequently asked

What is Mode-S code 7815B4?
7815B4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-304Y.
Where is Mode-S 7815B4 registered?
Mode-S code 7815B4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7815B4 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7815B4, octal 36012664, decimal 7,869,876.
What flights does 7815B4 operate?
Mode-S 7815B4 has broadcast 9 distinct callsigns, including CDC8684, CDC8683, CDC8656, CDC8655, CDC8998.