sensors Mode-S transponder
780F21
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-7195 · BOEING 737-800
- Hex
- 780F21
- Octal
- 36007441
- Decimal
- 7,868,193
- Country
- CN
- Tail
- B-7195
- Type
- B738
- Flights observed
- 65
- Distinct callsigns
- 12
- Country
- CN
- Last broadcast
- Jul 25, 07:55 UTC
Last known position
Country allocation
The ICAO 24-bit address 780F21 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 12 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CJX8905 | - | 26 | 2026-07-24 |
| CJX8931 | - | 12 | 2026-07-23 |
| CJX8906 | - | 8 | 2026-07-24 |
| CJX8929 | - | 7 | 2026-07-22 |
| CJX8928 | - | 2 | 2026-04-27 |
| CJX8927 | - | 2 | 2026-05-26 |
| CJX8913 | - | 2 | 2026-04-18 |
| CJX8914 | - | 1 | 2026-04-18 |
| CJX8904 | - | 1 | 2026-05-04 |
| CJX8903 | - | 1 | 2026-05-04 |
| CJX8883 | - | 1 | 2026-04-27 |
| CJX6696 | - | 1 | 2026-06-25 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-24 | CJX8905 | - | Jul 24, 14:30 UTC | Jul 25, 07:55 UTC | 17h 25m |
| 2026-07-24 | CJX8905 | - | Jul 24, 07:55 UTC | Jul 25, 03:55 UTC | 20h 0m |
| 2026-07-24 | CJX8906 | - | Jul 24, 03:20 UTC | Jul 24, 14:55 UTC | 11h 35m |
| 2026-07-23 | CJX8931 | - | Jul 23, 09:35 UTC | Jul 24, 08:05 UTC | 22h 30m |
| 2026-07-22 | CJX8931 | - | Jul 22, 14:25 UTC | Jul 23, 10:15 UTC | 19h 50m |
| 2026-07-22 | CJX8929 | - | Jul 22, 01:20 UTC | Jul 22, 14:25 UTC | 13h 5m |
| 2026-07-21 | CJX8929 | - | Jul 21, 09:30 UTC | Jul 22, 02:00 UTC | 16h 30m |
| 2026-07-21 | CJX8931 | - | Jul 21, 01:15 UTC | Jul 21, 10:10 UTC | 8h 55m |
| 2026-07-19 | CJX8929 | - | Jul 19, 11:35 UTC | Jul 20, 02:15 UTC | 14h 40m |
| 2026-07-19 | CJX8929 | - | Jul 19, 03:35 UTC | Jul 20, 02:15 UTC | 22h 40m |
| 2026-07-17 | CJX8905 | - | Jul 17, 02:59 UTC | Jul 17, 07:14 UTC | 4h 15m |
| 2026-07-16 | CJX8931 | - | Jul 16, 09:25 UTC | Jul 17, 07:14 UTC | 21h 50m |
| 2026-07-15 | CJX8931 | - | Jul 15, 14:40 UTC | Jul 16, 10:10 UTC | 19h 30m |
| 2026-07-15 | CJX8931 | - | Jul 15, 09:25 UTC | Jul 16, 01:35 UTC | 16h 10m |
| 2026-07-15 | CJX8931 | - | Jul 15, 01:15 UTC | Jul 15, 14:40 UTC | 13h 25m |
| 2026-07-14 | CJX8931 | - | Jul 14, 09:25 UTC | Jul 15, 01:55 UTC | 16h 29m |
| 2026-07-13 | CJX8931 | - | Jul 13, 11:10 UTC | Jul 14, 10:00 UTC | 22h 50m |
| 2026-07-13 | CJX8929 | - | Jul 13, 03:30 UTC | Jul 13, 11:20 UTC | 7h 50m |
| 2026-07-12 | CJX8906 | - | Jul 12, 14:20 UTC | Jul 13, 11:20 UTC | 21h 0m |
| 2026-07-12 | CJX8906 | - | Jul 12, 10:15 UTC | Jul 13, 03:30 UTC | 17h 15m |
| 2026-07-12 | CJX8906 | - | Jul 12, 06:45 UTC | Jul 13, 03:30 UTC | 20h 45m |
| 2026-07-12 | CJX8905 | - | Jul 12, 02:55 UTC | Jul 12, 14:25 UTC | 11h 30m |
| 2026-07-09 | CJX8931 | - | Jul 9, 11:05 UTC | Jul 9, 11:50 UTC | 45m |
| 2026-07-08 | CJX8929 | - | Jul 8, 01:10 UTC | Jul 8, 10:30 UTC | 9h 20m |
| 2026-07-06 | CJX8931 | - | Jul 6, 01:15 UTC | Jul 6, 10:00 UTC | 8h 45m |
| 2026-07-05 | CJX8931 | - | Jul 5, 11:25 UTC | Jul 6, 10:00 UTC | 22h 35m |
| 2026-07-05 | CJX8905 | - | Jul 5, 08:35 UTC | Jul 6, 01:20 UTC | 16h 45m |
| 2026-07-05 | CJX8905 | - | Jul 5, 02:50 UTC | Jul 6, 01:20 UTC | 22h 30m |
| 2026-07-02 | CJX8905 | - | Jul 2, 07:05 UTC | Jul 2, 15:40 UTC | 8h 35m |
| 2026-07-01 | CJX8905 | - | Jul 1, 14:25 UTC | Jul 2, 07:20 UTC | 16h 55m |
| 2026-07-01 | CJX8906 | - | Jul 1, 09:55 UTC | Jul 2, 07:20 UTC | 21h 25m |
| 2026-07-01 | CJX8905 | - | Jul 1, 02:50 UTC | Jul 1, 14:30 UTC | 11h 40m |
| 2026-06-30 | CJX8905 | - | Jun 30, 06:55 UTC | Jul 1, 03:00 UTC | 20h 5m |
| 2026-06-30 | CJX8905 | - | Jun 30, 02:45 UTC | Jun 30, 02:55 UTC | 10m |
| 2026-06-25 | CJX6696 | - | Jun 25, 07:54 UTC | Jun 25, 08:04 UTC | 10m |
| 2026-06-15 | CJX8905 | - | Jun 15, 08:20 UTC | Jun 15, 08:35 UTC | 15m |
| 2026-06-12 | CJX8905 | - | Jun 12, 10:10 UTC | Jun 13, 03:15 UTC | 17h 5m |
| 2026-06-12 | CJX8905 | - | Jun 12, 07:40 UTC | Jun 13, 03:15 UTC | 19h 35m |
| 2026-06-11 | CJX8905 | - | Jun 11, 14:20 UTC | Jun 12, 10:10 UTC | 19h 50m |
| 2026-06-11 | CJX8905 | - | Jun 11, 06:50 UTC | Jun 12, 03:10 UTC | 20h 21m |
| 2026-06-11 | CJX8905 | - | Jun 11, 02:50 UTC | Jun 11, 14:20 UTC | 11h 30m |
| 2026-06-10 | CJX8905 | - | Jun 10, 10:00 UTC | Jun 11, 07:10 UTC | 21h 10m |
| 2026-06-10 | CJX8905 | - | Jun 10, 07:00 UTC | Jun 11, 03:05 UTC | 20h 5m |
| 2026-06-10 | CJX8905 | - | Jun 10, 03:05 UTC | Jun 10, 10:10 UTC | 7h 5m |
| 2026-06-09 | CJX8905 | - | Jun 9, 10:00 UTC | Jun 10, 07:15 UTC | 21h 15m |
| 2026-06-08 | CJX8906 | - | Jun 8, 15:10 UTC | Jun 9, 10:00 UTC | 18h 50m |
| 2026-06-08 | CJX8905 | - | Jun 8, 02:45 UTC | Jun 8, 15:20 UTC | 12h 35m |
| 2026-06-07 | CJX8905 | - | Jun 7, 14:35 UTC | Jun 8, 07:40 UTC | 17h 5m |
| 2026-06-07 | CJX8905 | - | Jun 7, 02:45 UTC | Jun 7, 07:50 UTC | 5h 5m |
| 2026-05-26 | CJX8927 | - | May 26, 01:00 UTC | May 26, 01:14 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-7195 page for operator, model, and routing details .