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
- Flights observed
- 83
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 1d ago
Last known position
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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CDC8684 | Zhejiang Loong Airlines | 20 | 2026-05-14 |
| CDC8683 | Zhejiang Loong Airlines | 20 | 2026-05-14 |
| CDC8655 | - | 11 | 2026-07-10 |
| CDC8656 | - | 7 | 2026-07-10 |
| CDC8998 | Zhejiang Loong Airlines | 3 | 2026-06-11 |
| CDC8997 | Zhejiang Loong Airlines | 3 | 2026-06-11 |
| CDC8597 | - | 3 | 2026-06-09 |
| CDC8590 | - | 2 | 2026-04-23 |
| CDC8870 | - | 1 | 2026-07-03 |
| CDC8866 | - | 1 | 2026-07-01 |
| CDC8598 | - | 1 | 2026-05-17 |
| CDC8539 | - | 1 | 2026-07-10 |
| CDC8358 | - | 1 | 2026-07-06 |
| CDC8357 | - | 1 | 2026-07-08 |
| CDC8058 | - | 1 | 2026-07-16 |
| CDC8057 | - | 1 | 2026-07-15 |
| CDC8054 | - | 1 | 2026-07-04 |
| CDC8053 | - | 1 | 2026-07-04 |
| CDC8022 | - | 1 | 2026-07-14 |
| CDC8021 | - | 1 | 2026-07-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-16 | CDC8058 | - | Jul 16, 07:55 UTC | Jul 16, 12:00 UTC | 4h 5m |
| 2026-07-15 | CDC8057 | - | Jul 15, 14:15 UTC | Jul 16, 06:20 UTC | 16h 5m |
| 2026-07-14 | CDC8022 | - | Jul 14, 10:45 UTC | Jul 14, 13:05 UTC | 2h 20m |
| 2026-07-14 | CDC8021 | - | Jul 14, 07:00 UTC | Jul 14, 09:15 UTC | 2h 15m |
| 2026-07-10 | CDC8539 | - | Jul 10, 11:55 UTC | Jul 11, 00:05 UTC | 12h 10m |
| 2026-07-10 | CDC8656 | - | Jul 10, 08:05 UTC | Jul 10, 08:15 UTC | 10m |
| 2026-07-10 | CDC8655 | - | Jul 10, 06:25 UTC | Jul 10, 06:50 UTC | 25m |
| 2026-07-10 | CDC8655 | - | Jul 10, 01:50 UTC | Jul 10, 02:30 UTC | 40m |
| 2026-07-08 | CDC8357 | - | Jul 8, 06:00 UTC | Jul 8, 06:10 UTC | 10m |
| 2026-07-06 | CDC8358 | - | Jul 6, 06:00 UTC | Jul 6, 09:20 UTC | 3h 20m |
| 2026-07-04 | CDC8054 | - | Jul 4, 11:15 UTC | Jul 4, 12:25 UTC | 1h 10m |
| 2026-07-04 | CDC8053 | - | Jul 4, 08:20 UTC | Jul 4, 09:10 UTC | 50m |
| 2026-07-03 | CDC8870 | - | Jul 3, 12:10 UTC | Jul 3, 12:25 UTC | 15m |
| 2026-07-01 | CDC8866 | - | Jul 1, 14:30 UTC | Jul 1, 15:05 UTC | 35m |
| 2026-06-19 | CDC6076 | - | Jun 19, 08:09 UTC | Jun 19, 08:40 UTC | 30m |
| 2026-06-19 | CDC6075 | - | Jun 19, 02:45 UTC | Jun 19, 06:10 UTC | 3h 25m |
| 2026-06-14 | CDC8656 | - | Jun 14, 09:55 UTC | Jun 14, 13:50 UTC | 3h 55m |
| 2026-06-14 | CDC8655 | - | Jun 14, 07:40 UTC | Jun 14, 08:00 UTC | 20m |
| 2026-06-14 | CDC8655 | - | Jun 14, 01:20 UTC | Jun 14, 07:05 UTC | 5h 45m |
| 2026-06-13 | CDC8655 | - | Jun 13, 05:00 UTC | Jun 13, 05:25 UTC | 25m |
| 2026-06-13 | CDC8655 | - | Jun 13, 00:00 UTC | Jun 13, 00:20 UTC | 20m |
| 2026-06-11 | CDC8998 | SIN → DYG | Jun 11, 08:10 UTC | Jun 11, 11:00 UTC | 2h 50m |
| 2026-06-11 | CDC8997 | DYG → SIN | Jun 11, 06:10 UTC | Jun 11, 06:45 UTC | 35m |
| 2026-06-11 | CDC8997 | DYG → SIN | Jun 11, 03:25 UTC | Jun 11, 03:55 UTC | 30m |
| 2026-06-09 | CDC8597 | - | Jun 9, 11:00 UTC | Jun 10, 03:30 UTC | 16h 30m |
| 2026-06-02 | CDC8656 | - | Jun 2, 10:20 UTC | Jun 2, 10:40 UTC | 20m |
| 2026-06-02 | CDC8656 | - | Jun 2, 06:10 UTC | Jun 2, 06:20 UTC | 10m |
| 2026-06-02 | CDC8655 | - | Jun 2, 04:20 UTC | Jun 2, 04:40 UTC | 20m |
| 2026-05-20 | CDC8656 | - | May 20, 12:45 UTC | May 20, 13:00 UTC | 15m |
| 2026-05-20 | CDC8656 | - | May 20, 09:00 UTC | May 20, 09:10 UTC | 10m |
| 2026-05-20 | CDC8655 | - | May 20, 06:30 UTC | May 20, 06:50 UTC | 20m |
| 2026-05-19 | CDC8655 | - | May 19, 12:05 UTC | May 20, 02:00 UTC | 13h 55m |
| 2026-05-19 | CDC8656 | - | May 19, 08:15 UTC | May 19, 08:25 UTC | 10m |
| 2026-05-19 | CDC8655 | - | May 19, 06:30 UTC | May 19, 06:55 UTC | 25m |
| 2026-05-19 | CDC8655 | - | May 19, 01:45 UTC | May 19, 02:35 UTC | 50m |
| 2026-05-17 | CDC8598 | - | May 17, 04:00 UTC | May 17, 13:01 UTC | 9h 0m |
| 2026-05-16 | CDC8597 | - | May 16, 11:01 UTC | May 17, 04:15 UTC | 17h 15m |
| 2026-05-14 | CDC8683 | SZX → ENH | May 14, 23:25 UTC | May 14, 23:40 UTC | 15m |
| 2026-05-14 | CDC8684 | ENH → SZX | May 14, 16:20 UTC | May 14, 16:30 UTC | 10m |
| 2026-05-13 | CDC8683 | SZX → ENH | May 13, 22:55 UTC | May 13, 23:10 UTC | 15m |
| 2026-05-13 | CDC8684 | ENH → SZX | May 13, 17:55 UTC | May 13, 18:25 UTC | 30m |
| 2026-05-12 | CDC8683 | SZX → ENH | May 12, 23:05 UTC | May 12, 23:20 UTC | 15m |
| 2026-05-12 | CDC8684 | ENH → SZX | May 12, 16:05 UTC | May 12, 16:30 UTC | 25m |
| 2026-05-11 | CDC8684 | ENH → SZX | May 11, 16:15 UTC | May 11, 16:30 UTC | 15m |
| 2026-05-10 | CDC8683 | SZX → ENH | May 10, 23:15 UTC | May 10, 23:29 UTC | 15m |
| 2026-05-10 | CDC8684 | ENH → SZX | May 10, 16:25 UTC | May 10, 16:40 UTC | 15m |
| 2026-05-09 | CDC8683 | SZX → ENH | May 9, 23:09 UTC | May 9, 23:25 UTC | 15m |
| 2026-05-09 | CDC8684 | ENH → SZX | May 9, 16:20 UTC | May 9, 16:40 UTC | 20m |
| 2026-05-08 | CDC8683 | SZX → ENH | May 8, 22:55 UTC | May 8, 23:10 UTC | 15m |
| 2026-05-07 | CDC8683 | SZX → ENH | May 7, 22:59 UTC | May 7, 23:14 UTC | 15m |
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 .