sensors Mode-S transponder
781FF2
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-223Z · BOEING 767-300
- Hex
- 781FF2
- Octal
- 36017762
- Decimal
- 7,872,498
- Country
- CN
- Tail
- B-223Z
- Type
- B763
- Flights observed
- 57
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 17h ago
Last known position
Country allocation
The ICAO 24-bit address 781FF2 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 |
|---|---|---|---|
| CSS7223 | SF Airlines | 5 | 2026-05-18 |
| CSS173 | - | 5 | 2026-05-28 |
| CSS159 | SF Airlines | 5 | 2026-05-24 |
| CSS158 | SF Airlines | 3 | 2026-05-29 |
| CSS6835 | SF Airlines | 2 | 2026-04-22 |
| CSS6801 | SF Airlines | 2 | 2026-06-01 |
| CSS364 | SF Airlines | 2 | 2026-05-19 |
| CSS363 | SF Airlines | 2 | 2026-05-18 |
| CSS253 | - | 2 | 2026-05-15 |
| CSS240 | - | 2 | 2026-05-08 |
| CSS239 | SF Airlines | 2 | 2026-05-09 |
| CSS172 | - | 2 | 2026-05-31 |
| CSS171 | - | 2 | 2026-05-30 |
| CSS168 | SF Airlines | 2 | 2026-05-30 |
| CSS163 | SF Airlines | 2 | 2026-05-06 |
| CSS7636 | SF Airlines | 1 | 2026-04-27 |
| CSS6864 | SF Airlines | 1 | 2026-06-05 |
| CSS6842 | - | 1 | 2026-05-10 |
| CSS6809 | - | 1 | 2026-05-19 |
| CSS6806 | SF Airlines | 1 | 2026-05-31 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-06 | CSS256 | - | Jun 6, 09:45 UTC | Jun 6, 10:04 UTC | 20m |
| 2026-06-06 | CSS255 | - | Jun 6, 05:00 UTC | Jun 6, 07:50 UTC | 2h 50m |
| 2026-06-05 | CSS6864 | EHU → CAN | Jun 5, 21:35 UTC | Jun 5, 21:45 UTC | 10m |
| 2026-06-01 | CSS6801 | SZX → EHU | Jun 1, 17:40 UTC | Jun 1, 17:55 UTC | 15m |
| 2026-05-31 | CSS6806 | EHU → SZX | May 31, 20:50 UTC | May 31, 21:00 UTC | 10m |
| 2026-05-31 | CSS172 | - | May 31, 01:11 UTC | May 31, 09:30 UTC | 8h 19m |
| 2026-05-30 | CSS171 | - | May 30, 19:40 UTC | May 30, 22:15 UTC | 2h 35m |
| 2026-05-30 | CSS168 | HAN → EHU | May 30, 08:05 UTC | May 30, 08:20 UTC | 15m |
| 2026-05-30 | CSS168 | HAN → EHU | May 30, 02:15 UTC | May 30, 04:50 UTC | 2h 35m |
| 2026-05-29 | CSS158 | DEL → EHU | May 29, 12:40 UTC | May 30, 00:20 UTC | 11h 40m |
| 2026-05-28 | CSS157 | EHU → DEL | May 28, 22:15 UTC | May 29, 10:45 UTC | 12h 30m |
| 2026-05-28 | CSS174 | - | May 28, 21:25 UTC | May 28, 21:35 UTC | 10m |
| 2026-05-28 | CSS173 | - | May 28, 18:35 UTC | May 28, 18:55 UTC | 20m |
| 2026-05-28 | CSS173 | - | May 28, 15:45 UTC | May 28, 17:55 UTC | 2h 10m |
| 2026-05-27 | CSS170 | - | May 27, 16:35 UTC | May 28, 16:30 UTC | 23h 55m |
| 2026-05-27 | CSS148 | - | May 27, 00:39 UTC | May 27, 18:25 UTC | 17h 45m |
| 2026-05-26 | CSS161 | EHU → DEL | May 26, 19:34 UTC | May 26, 22:25 UTC | 2h 50m |
| 2026-05-25 | CSS160 | DEL → EHU | May 25, 16:55 UTC | May 25, 19:15 UTC | 2h 20m |
| 2026-05-24 | CSS159 | EHU → DEL | May 24, 21:10 UTC | May 25, 14:50 UTC | 17h 40m |
| 2026-05-24 | CSS173 | - | May 24, 18:45 UTC | May 24, 19:00 UTC | 15m |
| 2026-05-24 | CSS173 | - | May 24, 08:50 UTC | May 24, 18:00 UTC | 9h 10m |
| 2026-05-24 | CSS172 | - | May 24, 00:30 UTC | May 24, 04:10 UTC | 3h 40m |
| 2026-05-23 | CSS171 | - | May 23, 19:40 UTC | May 23, 22:25 UTC | 2h 45m |
| 2026-05-19 | CSS6809 | - | May 19, 17:40 UTC | May 19, 17:55 UTC | 15m |
| 2026-05-19 | CSS364 | NRT → SZX | May 19, 06:50 UTC | May 19, 07:00 UTC | 10m |
| 2026-05-19 | CSS364 | NRT → SZX | May 19, 02:40 UTC | May 19, 04:00 UTC | 1h 20m |
| 2026-05-18 | CSS363 | SZX → NRT | May 18, 23:45 UTC | May 19, 01:10 UTC | 1h 25m |
| 2026-05-18 | CSS363 | SZX → NRT | May 18, 21:15 UTC | May 18, 21:35 UTC | 20m |
| 2026-05-18 | CSS7223 | HGH → SZX | May 18, 18:55 UTC | May 18, 19:15 UTC | 20m |
| 2026-05-15 | CSS254 | - | May 15, 07:25 UTC | May 15, 09:50 UTC | 2h 25m |
| 2026-05-15 | CSS253 | - | May 15, 05:25 UTC | May 15, 05:40 UTC | 15m |
| 2026-05-15 | CSS253 | - | May 15, 02:40 UTC | May 15, 04:50 UTC | 2h 10m |
| 2026-05-13 | CSS242 | - | May 13, 08:35 UTC | May 13, 10:35 UTC | 2h 0m |
| 2026-05-13 | CSS241 | CTU → DEL | May 13, 03:50 UTC | May 13, 06:30 UTC | 2h 40m |
| 2026-05-11 | CSS6801 | SZX → EHU | May 11, 17:40 UTC | May 11, 17:55 UTC | 15m |
| 2026-05-10 | CSS6842 | - | May 10, 23:39 UTC | May 11, 00:00 UTC | 20m |
| 2026-05-09 | CSS158 | DEL → EHU | May 9, 12:05 UTC | May 9, 14:25 UTC | 2h 20m |
| 2026-05-09 | CSS239 | ZUH → DEL | May 9, 06:35 UTC | May 9, 09:10 UTC | 2h 35m |
| 2026-05-08 | CSS240 | - | May 8, 21:00 UTC | May 8, 23:00 UTC | 2h 0m |
| 2026-05-08 | CSS159 | EHU → DEL | May 8, 16:05 UTC | May 8, 18:45 UTC | 2h 40m |
| 2026-05-07 | CSS159 | EHU → DEL | May 7, 22:35 UTC | May 8, 18:45 UTC | 20h 10m |
| 2026-05-07 | CSS159 | EHU → DEL | May 7, 20:55 UTC | May 8, 18:45 UTC | 21h 50m |
| 2026-05-07 | CSS173 | - | May 7, 06:15 UTC | May 7, 19:00 UTC | 12h 45m |
| 2026-05-06 | CSS163 | EHU → DEL | May 6, 08:35 UTC | May 7, 04:10 UTC | 19h 34m |
| 2026-05-06 | CSS163 | EHU → DEL | May 6, 06:35 UTC | May 7, 04:10 UTC | 21h 34m |
| 2026-05-06 | CSS167 | - | May 6, 02:01 UTC | May 6, 04:35 UTC | 2h 34m |
| 2026-05-03 | CSS158 | DEL → EHU | May 3, 10:55 UTC | May 3, 13:00 UTC | 2h 5m |
| 2026-05-03 | CSS239 | ZUH → DEL | May 3, 06:30 UTC | May 3, 08:55 UTC | 2h 25m |
| 2026-05-02 | CSS240 | - | May 2, 20:55 UTC | May 2, 23:00 UTC | 2h 5m |
| 2026-05-02 | CSS159 | EHU → DEL | May 2, 16:15 UTC | May 2, 18:50 UTC | 2h 35m |
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-223Z page for operator, model, and routing details .