sensors Mode-S transponder
781F23
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-223L · BOEING 767-300
- Hex
- 781F23
- Octal
- 36017443
- Decimal
- 7,872,291
- Country
- CN
- Tail
- B-223L
- Type
- B763
- Flights observed
- 160
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- Jul 26, 07:25 UTC
Last known position
Country allocation
The ICAO 24-bit address 781F23 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 |
|---|---|---|---|
| CSS127 | - | 12 | 2026-07-01 |
| CSS161 | - | 9 | 2026-07-02 |
| CSS128 | - | 9 | 2026-07-01 |
| CSS358 | - | 6 | 2026-06-23 |
| CSS357 | - | 6 | 2026-06-23 |
| CSS257 | - | 6 | 2026-07-19 |
| CSS240 | - | 6 | 2026-06-30 |
| CSS239 | SF Airlines | 6 | 2026-06-21 |
| CSS206 | - | 6 | 2026-06-27 |
| CSS159 | - | 6 | 2026-06-19 |
| CSS364 | SF Airlines | 5 | 2026-07-26 |
| CSS363 | SF Airlines | 5 | 2026-07-25 |
| CSS168 | - | 5 | 2026-06-22 |
| CSS155 | - | 5 | 2026-07-03 |
| CSS6804 | - | 4 | 2026-06-22 |
| CSS7223 | SF Airlines | 3 | 2026-06-10 |
| CSS6835 | SF Airlines | 3 | 2026-06-10 |
| CSS6801 | SF Airlines | 3 | 2026-06-23 |
| CSS205 | - | 3 | 2026-04-16 |
| CSS167 | - | 3 | 2026-06-21 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | CSS364 | NRT → SZX | Jul 26, 07:05 UTC | Jul 26, 07:25 UTC | 20m |
| 2026-07-26 | CSS364 | NRT → SZX | Jul 26, 03:10 UTC | Jul 26, 04:45 UTC | 1h 35m |
| 2026-07-25 | CSS363 | SZX → NRT | Jul 25, 19:10 UTC | Jul 25, 21:05 UTC | 1h 55m |
| 2026-07-24 | CSS6806 | EHU → SZX | Jul 24, 21:55 UTC | Jul 24, 22:10 UTC | 15m |
| 2026-07-24 | CSS254 | - | Jul 24, 07:20 UTC | Jul 24, 10:35 UTC | 3h 15m |
| 2026-07-24 | CSS253 | - | Jul 24, 05:15 UTC | Jul 24, 05:35 UTC | 20m |
| 2026-07-23 | CSS253 | - | Jul 23, 16:55 UTC | Jul 24, 04:35 UTC | 11h 40m |
| 2026-07-22 | CSS242 | - | Jul 22, 10:20 UTC | Jul 22, 11:10 UTC | 50m |
| 2026-07-22 | CSS241 | CTU → DEL | Jul 22, 02:55 UTC | Jul 22, 05:25 UTC | 2h 30m |
| 2026-07-19 | CSS256 | - | Jul 19, 13:45 UTC | Jul 19, 14:55 UTC | 1h 10m |
| 2026-07-19 | CSS257 | DAC → DAC | Jul 19, 00:00 UTC | Jul 19, 12:10 UTC | 12h 10m |
| 2026-07-18 | CSS257 | - | Jul 18, 08:30 UTC | Jul 18, 18:45 UTC | 10h 15m |
| 2026-07-18 | CSS255 | - | Jul 18, 05:35 UTC | Jul 18, 06:50 UTC | 1h 15m |
| 2026-07-15 | CSS7635 | - | Jul 15, 22:00 UTC | Jul 16, 16:25 UTC | 18h 25m |
| 2026-07-12 | CSS256 | - | Jul 12, 12:35 UTC | Jul 12, 13:40 UTC | 1h 5m |
| 2026-07-12 | CSS257 | DAC → DAC | Jul 12, 02:40 UTC | Jul 12, 10:55 UTC | 8h 15m |
| 2026-07-11 | CSS257 | - | Jul 11, 10:20 UTC | Jul 11, 18:15 UTC | 7h 55m |
| 2026-07-11 | CSS255 | - | Jul 11, 04:40 UTC | Jul 11, 08:01 UTC | 3h 20m |
| 2026-07-10 | CSS6864 | - | Jul 10, 21:25 UTC | Jul 10, 21:35 UTC | 10m |
| 2026-07-09 | CSS250 | - | Jul 9, 02:15 UTC | Jul 9, 10:45 UTC | 8h 30m |
| 2026-07-07 | CSS7103 | - | Jul 7, 17:05 UTC | Jul 7, 17:20 UTC | 15m |
| 2026-07-05 | CSS6839 | - | Jul 5, 00:50 UTC | Jul 5, 01:00 UTC | 10m |
| 2026-07-04 | CSS6802 | - | Jul 4, 21:00 UTC | Jul 4, 21:30 UTC | 30m |
| 2026-07-04 | CSS156 | - | Jul 4, 11:55 UTC | Jul 4, 15:15 UTC | 3h 20m |
| 2026-07-03 | CSS155 | - | Jul 3, 16:50 UTC | Jul 4, 10:20 UTC | 17h 30m |
| 2026-07-03 | CSS155 | - | Jul 3, 12:50 UTC | Jul 4, 10:20 UTC | 21h 30m |
| 2026-07-03 | CSS155 | - | Jul 3, 10:50 UTC | Jul 4, 10:20 UTC | 23h 30m |
| 2026-07-02 | CSS162 | - | Jul 2, 23:55 UTC | Jul 3, 18:35 UTC | 18h 40m |
| 2026-07-02 | CSS161 | - | Jul 2, 19:20 UTC | Jul 2, 22:05 UTC | 2h 45m |
| 2026-07-01 | CSS161 | - | Jul 1, 22:50 UTC | Jul 2, 22:05 UTC | 23h 15m |
| 2026-07-01 | CSS161 | - | Jul 1, 22:10 UTC | Jul 2, 20:45 UTC | 22h 35m |
| 2026-07-01 | CSS128 | - | Jul 1, 16:55 UTC | Jul 1, 22:55 UTC | 6h 0m |
| 2026-07-01 | CSS127 | - | Jul 1, 05:40 UTC | Jul 1, 14:55 UTC | 9h 15m |
| 2026-06-30 | CSS127 | - | Jun 30, 16:50 UTC | Jul 1, 14:55 UTC | 22h 5m |
| 2026-06-30 | CSS160 | - | Jun 30, 15:00 UTC | Jul 1, 14:45 UTC | 23h 45m |
| 2026-06-30 | CSS240 | - | Jun 30, 00:25 UTC | Jun 30, 12:50 UTC | 12h 26m |
| 2026-06-29 | CSS161 | - | Jun 29, 19:39 UTC | Jun 29, 22:30 UTC | 2h 50m |
| 2026-06-28 | CSS128 | - | Jun 28, 14:25 UTC | Jun 28, 20:19 UTC | 5h 55m |
| 2026-06-27 | CSS206 | BUD → BUD | Jun 27, 16:59 UTC | Jun 28, 11:19 UTC | 18h 20m |
| 2026-06-27 | CSS127 | - | Jun 27, 06:15 UTC | Jun 27, 13:49 UTC | 7h 35m |
| 2026-06-26 | CSS127 | - | Jun 26, 16:49 UTC | Jun 27, 13:49 UTC | 21h 0m |
| 2026-06-26 | CSS127 | - | Jun 26, 16:44 UTC | Jun 27, 13:49 UTC | 21h 5m |
| 2026-06-23 | CSS6801 | SZX → EHU | Jun 23, 17:50 UTC | Jun 23, 18:04 UTC | 15m |
| 2026-06-23 | CSS358 | - | Jun 23, 03:45 UTC | Jun 23, 04:05 UTC | 20m |
| 2026-06-23 | CSS358 | - | Jun 23, 02:49 UTC | Jun 23, 03:09 UTC | 20m |
| 2026-06-23 | CSS357 | - | Jun 23, 00:04 UTC | Jun 23, 00:50 UTC | 45m |
| 2026-06-22 | CSS357 | - | Jun 22, 23:20 UTC | Jun 22, 23:29 UTC | 10m |
| 2026-06-22 | CSS6804 | - | Jun 22, 20:55 UTC | Jun 22, 21:14 UTC | 20m |
| 2026-06-22 | CSS168 | - | Jun 22, 07:40 UTC | Jun 22, 08:04 UTC | 25m |
| 2026-06-22 | CSS168 | - | Jun 22, 02:25 UTC | Jun 22, 04:34 UTC | 2h 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-223L page for operator, model, and routing details .