sensors Mode-S transponder
7815AB
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-304T · AIRBUS A-320
- Hex
- 7815AB
- Octal
- 36012653
- Decimal
- 7,869,867
- Country
- CN
- Tail
- B-304T
- Type
- A320
- Flights observed
- 32
- Distinct callsigns
- 19
- Country
- CN
- Last broadcast
- 5d ago
Last known position
Country allocation
The ICAO 24-bit address 7815AB 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 19 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| HXA4095 | - | 7 | 2026-07-10 |
| HXA4228 | - | 5 | 2026-07-12 |
| HXA4630 | - | 2 | 2026-07-07 |
| HXA4629 | - | 2 | 2026-07-07 |
| HXA4096 | - | 2 | 2026-04-22 |
| HXA4940 | - | 1 | 2026-06-26 |
| HXA4939 | - | 1 | 2026-06-26 |
| HXA4840 | - | 1 | 2026-06-30 |
| HXA4808 | China Express Airlines | 1 | 2026-06-13 |
| HXA4719 | - | 1 | 2026-06-15 |
| HXA4549 | - | 1 | 2026-04-28 |
| HXA4274 | - | 1 | 2026-07-09 |
| HXA4227 | - | 1 | 2026-05-17 |
| HXA4163 | China Express Airlines | 1 | 2026-04-19 |
| HXA4140 | China Express Airlines | 1 | 2026-06-11 |
| HXA4139 | China Express Airlines | 1 | 2026-06-11 |
| HXA4018 | China Express Airlines | 1 | 2026-06-26 |
| HXA2903 | - | 1 | 2026-06-10 |
| HXA2779 | - | 1 | 2026-07-12 |
Recent flights last 32
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-12 | HXA2779 | - | Jul 12, 04:50 UTC | Jul 13, 00:40 UTC | 19h 50m |
| 2026-07-12 | HXA4228 | - | Jul 12, 04:30 UTC | Jul 13, 00:40 UTC | 20h 10m |
| 2026-07-10 | HXA4095 | - | Jul 10, 09:00 UTC | Jul 10, 09:15 UTC | 15m |
| 2026-07-09 | HXA4274 | - | Jul 9, 14:55 UTC | Jul 9, 15:05 UTC | 10m |
| 2026-07-07 | HXA4630 | - | Jul 7, 05:40 UTC | Jul 7, 05:55 UTC | 15m |
| 2026-07-07 | HXA4629 | - | Jul 7, 02:30 UTC | Jul 7, 02:40 UTC | 10m |
| 2026-06-30 | HXA4840 | - | Jun 30, 04:00 UTC | Jun 30, 04:10 UTC | 10m |
| 2026-06-26 | HXA4018 | BPE → TFU | Jun 26, 11:14 UTC | Jun 27, 03:44 UTC | 16h 30m |
| 2026-06-26 | HXA4940 | - | Jun 26, 04:04 UTC | Jun 26, 04:20 UTC | 15m |
| 2026-06-26 | HXA4939 | - | Jun 26, 02:30 UTC | Jun 26, 02:40 UTC | 10m |
| 2026-06-24 | HXA4630 | - | Jun 24, 13:20 UTC | Jun 25, 06:35 UTC | 17h 15m |
| 2026-06-24 | HXA4629 | - | Jun 24, 10:39 UTC | Jun 24, 10:55 UTC | 15m |
| 2026-06-19 | HXA4228 | - | Jun 19, 04:25 UTC | Jun 19, 04:44 UTC | 20m |
| 2026-06-15 | HXA4719 | - | Jun 15, 12:49 UTC | Jun 16, 06:10 UTC | 17h 20m |
| 2026-06-13 | HXA4808 | CKG → ZQZ | Jun 13, 02:45 UTC | Jun 13, 03:20 UTC | 35m |
| 2026-06-11 | HXA4140 | SZX → HDG | Jun 11, 06:00 UTC | Jun 11, 06:10 UTC | 10m |
| 2026-06-11 | HXA4139 | HDG → SZX | Jun 11, 03:10 UTC | Jun 11, 03:35 UTC | 25m |
| 2026-06-10 | HXA2903 | - | Jun 10, 03:35 UTC | Jun 10, 06:00 UTC | 2h 25m |
| 2026-06-01 | HXA4228 | - | Jun 1, 04:20 UTC | Jun 1, 04:40 UTC | 20m |
| 2026-05-29 | HXA4095 | - | May 29, 09:40 UTC | May 29, 09:55 UTC | 15m |
| 2026-05-17 | HXA4227 | - | May 17, 09:30 UTC | May 18, 03:40 UTC | 18h 10m |
| 2026-05-15 | HXA4095 | - | May 15, 09:35 UTC | May 15, 12:50 UTC | 3h 15m |
| 2026-05-03 | HXA4228 | - | May 3, 05:55 UTC | May 3, 06:20 UTC | 25m |
| 2026-05-01 | HXA4095 | - | May 1, 09:20 UTC | May 1, 12:45 UTC | 3h 25m |
| 2026-04-30 | HXA4095 | - | Apr 30, 15:00 UTC | May 1, 12:45 UTC | 21h 45m |
| 2026-04-29 | HXA4095 | - | Apr 29, 09:35 UTC | Apr 29, 09:55 UTC | 20m |
| 2026-04-28 | HXA4549 | - | Apr 28, 02:20 UTC | Apr 28, 02:30 UTC | 10m |
| 2026-04-22 | HXA4096 | - | Apr 22, 14:25 UTC | Apr 22, 17:05 UTC | 2h 40m |
| 2026-04-20 | HXA4096 | - | Apr 20, 13:00 UTC | Apr 20, 13:10 UTC | 10m |
| 2026-04-20 | HXA4095 | - | Apr 20, 10:15 UTC | Apr 20, 10:25 UTC | 10m |
| 2026-04-19 | HXA4163 | TSN → DYG | Apr 19, 09:50 UTC | Apr 19, 10:10 UTC | 20m |
| 2026-04-17 | HXA4228 | - | Apr 17, 05:40 UTC | Apr 17, 05:50 UTC | 10m |
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-304T page for operator, model, and routing details .