sensors Mode-S transponder
78123C
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-1326 · BOEING 737-800
- Hex
- 78123C
- Octal
- 36011074
- Decimal
- 7,868,988
- Country
- CN
- Tail
- B-1326
- Type
- B738
- Flights observed
- 41
- Distinct callsigns
- 13
- Country
- CN
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 78123C 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 13 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CJX8905 | - | 11 | 2026-05-25 |
| CJX8931 | - | 8 | 2026-05-23 |
| CJX8913 | - | 3 | 2026-05-30 |
| CJX8903 | - | 3 | 2026-05-09 |
| CJX8929 | - | 2 | 2026-04-25 |
| CJX8928 | - | 2 | 2026-05-29 |
| CJX8904 | - | 2 | 2026-05-08 |
| CJX8883 | - | 2 | 2026-05-29 |
| CJX6608 | - | 2 | 2026-04-15 |
| CJX6607 | - | 2 | 2026-04-15 |
| CJX8910 | - | 1 | 2026-06-01 |
| CJX8909 | - | 1 | 2026-06-01 |
| CJX8906 | - | 1 | 2026-05-12 |
Recent flights last 41
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-01 | CJX8910 | - | Jun 1, 11:30 UTC | Jun 1, 11:40 UTC | 10m |
| 2026-06-01 | CJX8909 | - | Jun 1, 09:25 UTC | Jun 1, 09:35 UTC | 10m |
| 2026-05-30 | CJX8913 | - | May 30, 12:05 UTC | May 30, 12:30 UTC | 25m |
| 2026-05-29 | CJX8928 | - | May 29, 07:30 UTC | May 29, 07:40 UTC | 10m |
| 2026-05-29 | CJX8883 | - | May 29, 03:10 UTC | May 29, 03:25 UTC | 15m |
| 2026-05-27 | CJX8913 | - | May 27, 12:35 UTC | May 27, 15:55 UTC | 3h 20m |
| 2026-05-25 | CJX8905 | - | May 25, 07:15 UTC | May 25, 10:10 UTC | 2h 55m |
| 2026-05-23 | CJX8931 | - | May 23, 09:40 UTC | May 24, 07:00 UTC | 21h 21m |
| 2026-05-23 | CJX8931 | - | May 23, 01:30 UTC | May 23, 10:15 UTC | 8h 45m |
| 2026-05-22 | CJX8931 | - | May 22, 10:15 UTC | May 23, 01:30 UTC | 15h 15m |
| 2026-05-22 | CJX8931 | - | May 22, 01:40 UTC | May 22, 10:30 UTC | 8h 50m |
| 2026-05-21 | CJX8931 | - | May 21, 09:35 UTC | May 22, 01:40 UTC | 16h 5m |
| 2026-05-21 | CJX8931 | - | May 21, 01:35 UTC | May 21, 10:20 UTC | 8h 45m |
| 2026-05-15 | CJX8931 | - | May 15, 09:50 UTC | May 16, 01:20 UTC | 15h 29m |
| 2026-05-15 | CJX8931 | - | May 15, 01:55 UTC | May 15, 09:55 UTC | 8h 0m |
| 2026-05-12 | CJX8906 | - | May 12, 09:55 UTC | May 12, 10:05 UTC | 10m |
| 2026-05-12 | CJX8905 | - | May 12, 06:55 UTC | May 12, 07:10 UTC | 15m |
| 2026-05-10 | CJX8913 | - | May 10, 01:04 UTC | May 10, 15:05 UTC | 14h 0m |
| 2026-05-09 | CJX8903 | - | May 9, 08:50 UTC | May 10, 01:14 UTC | 16h 25m |
| 2026-05-08 | CJX8904 | - | May 8, 13:30 UTC | May 8, 13:40 UTC | 10m |
| 2026-05-08 | CJX8903 | - | May 8, 09:04 UTC | May 8, 09:19 UTC | 15m |
| 2026-05-07 | CJX8928 | - | May 7, 07:30 UTC | May 7, 07:40 UTC | 10m |
| 2026-05-07 | CJX8883 | - | May 7, 03:15 UTC | May 7, 03:35 UTC | 20m |
| 2026-05-04 | CJX8905 | - | May 4, 02:45 UTC | May 4, 14:30 UTC | 11h 45m |
| 2026-05-03 | CJX8905 | - | May 3, 09:40 UTC | May 4, 07:15 UTC | 21h 35m |
| 2026-04-30 | CJX8904 | - | Apr 30, 07:40 UTC | Apr 30, 07:50 UTC | 10m |
| 2026-04-30 | CJX8903 | - | Apr 30, 03:35 UTC | Apr 30, 03:50 UTC | 15m |
| 2026-04-26 | CJX8905 | - | Apr 26, 14:35 UTC | Apr 27, 07:20 UTC | 16h 45m |
| 2026-04-26 | CJX8905 | - | Apr 26, 10:15 UTC | Apr 27, 07:20 UTC | 21h 5m |
| 2026-04-26 | CJX8905 | - | Apr 26, 03:05 UTC | Apr 26, 07:15 UTC | 4h 10m |
| 2026-04-25 | CJX8905 | - | Apr 25, 10:20 UTC | Apr 26, 07:15 UTC | 20h 55m |
| 2026-04-25 | CJX8929 | - | Apr 25, 01:10 UTC | Apr 25, 10:35 UTC | 9h 25m |
| 2026-04-24 | CJX8929 | - | Apr 24, 10:00 UTC | Apr 25, 01:45 UTC | 15h 45m |
| 2026-04-24 | - | - | Apr 24, 01:35 UTC | Apr 24, 10:05 UTC | 8h 30m |
| 2026-04-20 | CJX8905 | - | Apr 20, 03:00 UTC | Apr 20, 14:25 UTC | 11h 25m |
| 2026-04-19 | CJX8905 | - | Apr 19, 03:05 UTC | Apr 20, 03:00 UTC | 23h 55m |
| 2026-04-19 | CJX8905 | - | Apr 19, 02:55 UTC | Apr 19, 03:10 UTC | 15m |
| 2026-04-15 | CJX6608 | - | Apr 15, 11:40 UTC | Apr 15, 12:05 UTC | 25m |
| 2026-04-15 | CJX6608 | - | Apr 15, 08:35 UTC | Apr 15, 08:55 UTC | 20m |
| 2026-04-15 | CJX6607 | - | Apr 15, 06:10 UTC | Apr 15, 06:55 UTC | 45m |
| 2026-04-15 | CJX6607 | - | Apr 15, 03:15 UTC | Apr 15, 03:25 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-1326 page for operator, model, and routing details .