sensors Mode-S transponder
781CFD
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-221N · BOEING 767-300
- Hex
- 781CFD
- Octal
- 36016375
- Decimal
- 7,871,741
- Country
- CN
- Tail
- B-221N
- Type
- B763
- Flights observed
- 70
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 781CFD 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 |
|---|---|---|---|
| CSS163 | SF Airlines | 7 | 2026-05-14 |
| CSS364 | SF Airlines | 5 | 2026-05-26 |
| CSS363 | SF Airlines | 5 | 2026-05-25 |
| CSS6805 | SF Airlines | 3 | 2026-05-26 |
| CSS358 | SF Airlines | 3 | 2026-05-08 |
| CSS357 | SF Airlines | 3 | 2026-05-08 |
| CSS164 | SF Airlines | 3 | 2026-05-14 |
| CSS159 | SF Airlines | 3 | 2026-05-17 |
| CSS7223 | SF Airlines | 2 | 2026-06-01 |
| CSS6835 | SF Airlines | 2 | 2026-06-01 |
| CSS6804 | SF Airlines | 2 | 2026-05-23 |
| CSS258 | - | 2 | 2026-04-25 |
| CSS257 | - | 2 | 2026-04-25 |
| CSS253 | - | 2 | 2026-04-22 |
| CSS239 | SF Airlines | 2 | 2026-05-17 |
| CSS232 | - | 2 | 2026-04-30 |
| CSS231 | SF Airlines | 2 | 2026-04-30 |
| CSS184 | SF Airlines | 2 | 2026-05-28 |
| CSS160 | SF Airlines | 2 | 2026-05-13 |
| CSS148 | - | 2 | 2026-05-20 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-01 | CSS6835 | SZX → HGH | Jun 1, 20:45 UTC | Jun 1, 21:00 UTC | 15m |
| 2026-06-01 | CSS7223 | HGH → SZX | Jun 1, 18:10 UTC | Jun 1, 19:00 UTC | 50m |
| 2026-05-31 | CSS6835 | SZX → HGH | May 31, 20:55 UTC | May 31, 21:05 UTC | 10m |
| 2026-05-31 | CSS7223 | HGH → SZX | May 31, 18:15 UTC | May 31, 19:00 UTC | 45m |
| 2026-05-29 | CSS7635 | SHE → EHU | May 29, 22:00 UTC | May 30, 16:15 UTC | 18h 15m |
| 2026-05-28 | CSS184 | ORD → YHZ | May 28, 12:40 UTC | May 28, 14:30 UTC | 1h 50m |
| 2026-05-28 | CSS184 | ORD → YHZ | May 28, 07:00 UTC | May 28, 10:40 UTC | 3h 40m |
| 2026-05-28 | CSS183 | ANC → LAX | May 28, 01:30 UTC | May 28, 04:05 UTC | 2h 35m |
| 2026-05-26 | CSS6805 | SZX → EHU | May 26, 16:55 UTC | May 26, 17:09 UTC | 15m |
| 2026-05-26 | CSS364 | NRT → SZX | May 26, 05:30 UTC | May 26, 05:40 UTC | 10m |
| 2026-05-26 | CSS364 | NRT → SZX | May 26, 01:24 UTC | May 26, 02:49 UTC | 1h 25m |
| 2026-05-25 | CSS363 | SZX → NRT | May 25, 19:35 UTC | May 25, 23:19 UTC | 3h 45m |
| 2026-05-23 | CSS6804 | EHU → SZX | May 23, 20:30 UTC | May 23, 20:45 UTC | 15m |
| 2026-05-20 | CSS148 | - | May 20, 00:30 UTC | May 20, 02:20 UTC | 1h 50m |
| 2026-05-19 | CSS161 | EHU → DEL | May 19, 20:30 UTC | May 19, 22:35 UTC | 2h 5m |
| 2026-05-18 | CSS148 | - | May 18, 11:20 UTC | May 18, 13:30 UTC | 2h 10m |
| 2026-05-17 | CSS239 | ZUH → DEL | May 17, 20:35 UTC | May 18, 09:15 UTC | 12h 40m |
| 2026-05-17 | CSS159 | EHU → DEL | May 17, 16:35 UTC | May 17, 18:45 UTC | 2h 10m |
| 2026-05-15 | CSS6805 | SZX → EHU | May 15, 17:00 UTC | May 15, 17:15 UTC | 15m |
| 2026-05-14 | CSS164 | DEL → EHU | May 14, 06:20 UTC | May 14, 08:10 UTC | 1h 50m |
| 2026-05-14 | CSS163 | EHU → DEL | May 14, 02:35 UTC | May 14, 04:05 UTC | 1h 30m |
| 2026-05-13 | CSS160 | DEL → EHU | May 13, 16:20 UTC | May 14, 02:30 UTC | 10h 10m |
| 2026-05-13 | CSS239 | ZUH → DEL | May 13, 11:15 UTC | May 13, 13:50 UTC | 2h 35m |
| 2026-05-13 | CSS240 | - | May 13, 01:35 UTC | May 13, 03:25 UTC | 1h 50m |
| 2026-05-12 | CSS163 | EHU → DEL | May 12, 21:10 UTC | May 12, 23:35 UTC | 2h 25m |
| 2026-05-11 | CSS160 | DEL → EHU | May 11, 14:40 UTC | May 11, 16:55 UTC | 2h 15m |
| 2026-05-10 | CSS159 | EHU → DEL | May 10, 17:25 UTC | May 11, 13:00 UTC | 19h 35m |
| 2026-05-10 | CSS159 | EHU → DEL | May 10, 13:19 UTC | May 11, 13:00 UTC | 23h 40m |
| 2026-05-10 | CSS169 | EHU → MAA | May 10, 11:40 UTC | May 11, 11:15 UTC | 23h 35m |
| 2026-05-08 | CSS358 | TPE → SZX | May 8, 03:39 UTC | May 8, 05:00 UTC | 1h 20m |
| 2026-05-08 | CSS357 | SZX → TPE | May 8, 01:09 UTC | May 8, 01:40 UTC | 30m |
| 2026-05-08 | CSS357 | SZX → TPE | May 8, 00:20 UTC | May 8, 00:34 UTC | 15m |
| 2026-05-07 | CSS6804 | EHU → SZX | May 7, 20:30 UTC | May 7, 20:45 UTC | 15m |
| 2026-05-06 | CSS6805 | SZX → EHU | May 6, 16:50 UTC | May 6, 17:00 UTC | 10m |
| 2026-05-05 | CSS6836 | HGH → SZX | May 5, 22:30 UTC | May 5, 22:50 UTC | 20m |
| 2026-05-05 | CSS364 | NRT → SZX | May 5, 05:55 UTC | May 5, 06:10 UTC | 15m |
| 2026-05-05 | CSS364 | NRT → SZX | May 5, 01:25 UTC | May 5, 03:00 UTC | 1h 35m |
| 2026-05-04 | CSS363 | SZX → NRT | May 4, 21:35 UTC | May 4, 22:50 UTC | 1h 15m |
| 2026-05-04 | CSS363 | SZX → NRT | May 4, 19:25 UTC | May 4, 19:40 UTC | 15m |
| 2026-05-03 | CSS6806 | EHU → SZX | May 3, 21:39 UTC | May 3, 21:54 UTC | 15m |
| 2026-05-03 | CSS364 | NRT → SZX | May 3, 04:25 UTC | May 3, 05:50 UTC | 1h 25m |
| 2026-05-02 | CSS363 | SZX → NRT | May 2, 21:40 UTC | May 2, 23:05 UTC | 1h 25m |
| 2026-05-02 | CSS363 | SZX → NRT | May 2, 19:20 UTC | May 2, 19:30 UTC | 10m |
| 2026-04-30 | CSS232 | - | Apr 30, 08:55 UTC | Apr 30, 10:00 UTC | 1h 5m |
| 2026-04-30 | CSS232 | - | Apr 30, 07:25 UTC | Apr 30, 07:35 UTC | 10m |
| 2026-04-30 | CSS231 | CTU → BOM | Apr 30, 04:50 UTC | Apr 30, 05:05 UTC | 15m |
| 2026-04-30 | CSS231 | CTU → BOM | Apr 30, 02:00 UTC | Apr 30, 03:30 UTC | 1h 30m |
| 2026-04-27 | CSS246 | - | Apr 27, 09:35 UTC | Apr 27, 11:35 UTC | 2h 0m |
| 2026-04-27 | CSS245 | CAN → DEL | Apr 27, 01:15 UTC | Apr 27, 06:30 UTC | 5h 15m |
| 2026-04-26 | CSS256 | - | Apr 26, 09:45 UTC | Apr 26, 10:30 UTC | 45m |
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-221N page for operator, model, and routing details .