sensors Mode-S transponder
781677
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-20A2 · BOEING 767-300
- Hex
- 781677
- Octal
- 36013167
- Decimal
- 7,870,071
- Country
- CN
- Tail
- B-20A2
- Type
- B763
- Flights observed
- 61
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address 781677 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 |
|---|---|---|---|
| CSS239 | SF Airlines | 6 | 2026-04-27 |
| CSS240 | - | 5 | 2026-04-26 |
| CSS161 | SF Airlines | 5 | 2026-04-22 |
| CSS159 | SF Airlines | 4 | 2026-04-26 |
| CSS364 | SF Airlines | 3 | 2026-05-30 |
| CSS363 | SF Airlines | 3 | 2026-05-29 |
| CSS155 | SF Airlines | 3 | 2026-04-24 |
| CSS6801 | SF Airlines | 2 | 2026-05-12 |
| CSS310 | SF Airlines | 2 | 2026-05-29 |
| CSS309 | SF Airlines | 2 | 2026-05-29 |
| CSS257 | - | 2 | 2026-05-23 |
| CSS163 | SF Airlines | 2 | 2026-04-14 |
| CSS162 | SF Airlines | 2 | 2026-04-17 |
| CSS156 | SF Airlines | 2 | 2026-04-25 |
| CSS7635 | SF Airlines | 1 | 2026-05-27 |
| CSS6804 | SF Airlines | 1 | 2026-04-30 |
| CSS358 | SF Airlines | 1 | 2026-05-12 |
| CSS258 | - | 1 | 2026-04-30 |
| CSS256 | - | 1 | 2026-05-24 |
| CSS255 | - | 1 | 2026-05-23 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | CSS364 | NRT → SZX | May 30, 01:50 UTC | May 30, 03:25 UTC | 1h 35m |
| 2026-05-29 | CSS363 | SZX → NRT | May 29, 22:45 UTC | May 30, 00:00 UTC | 1h 15m |
| 2026-05-29 | CSS310 | KUL → SZX | May 29, 17:35 UTC | May 29, 17:55 UTC | 20m |
| 2026-05-29 | CSS310 | KUL → SZX | May 29, 14:25 UTC | May 29, 14:50 UTC | 25m |
| 2026-05-29 | CSS309 | SZX → KUL | May 29, 03:50 UTC | May 29, 04:20 UTC | 30m |
| 2026-05-29 | CSS309 | SZX → KUL | May 29, 00:55 UTC | May 29, 01:05 UTC | 10m |
| 2026-05-27 | CSS7635 | SHE → EHU | May 27, 22:05 UTC | May 28, 16:40 UTC | 18h 35m |
| 2026-05-27 | CSS144 | OSL → NQZ | May 27, 07:05 UTC | May 27, 22:10 UTC | 15h 5m |
| 2026-05-27 | CSS143 | - | May 27, 04:19 UTC | May 27, 04:39 UTC | 20m |
| 2026-05-24 | CSS256 | - | May 24, 06:00 UTC | May 24, 06:50 UTC | 50m |
| 2026-05-23 | CSS257 | DAC → DAC | May 23, 19:25 UTC | May 24, 04:15 UTC | 8h 50m |
| 2026-05-23 | CSS255 | - | May 23, 15:30 UTC | May 23, 16:10 UTC | 40m |
| 2026-05-19 | CSS237 | CTU → MAA | May 19, 02:00 UTC | May 19, 08:45 UTC | 6h 45m |
| 2026-05-17 | CSS364 | NRT → SZX | May 17, 05:20 UTC | May 17, 05:30 UTC | 10m |
| 2026-05-17 | CSS364 | NRT → SZX | May 17, 01:30 UTC | May 17, 02:45 UTC | 1h 15m |
| 2026-05-16 | CSS363 | SZX → NRT | May 16, 22:00 UTC | May 16, 23:25 UTC | 1h 25m |
| 2026-05-16 | CSS363 | SZX → NRT | May 16, 19:25 UTC | May 16, 19:35 UTC | 10m |
| 2026-05-12 | CSS6801 | SZX → EHU | May 12, 17:30 UTC | May 12, 17:45 UTC | 15m |
| 2026-05-12 | CSS358 | TPE → SZX | May 12, 03:25 UTC | May 12, 03:40 UTC | 15m |
| 2026-05-06 | CSS6801 | SZX → EHU | May 6, 17:35 UTC | May 6, 17:45 UTC | 10m |
| 2026-04-30 | CSS6804 | EHU → SZX | Apr 30, 20:50 UTC | Apr 30, 21:00 UTC | 10m |
| 2026-04-30 | CSS258 | - | Apr 30, 09:10 UTC | Apr 30, 09:35 UTC | 25m |
| 2026-04-30 | CSS257 | - | Apr 30, 06:50 UTC | Apr 30, 07:45 UTC | 55m |
| 2026-04-27 | CSS148 | - | Apr 27, 12:50 UTC | Apr 27, 14:50 UTC | 2h 0m |
| 2026-04-27 | CSS239 | ZUH → DEL | Apr 27, 07:30 UTC | Apr 27, 10:20 UTC | 2h 50m |
| 2026-04-27 | CSS239 | ZUH → DEL | Apr 27, 04:35 UTC | Apr 27, 04:45 UTC | 10m |
| 2026-04-26 | CSS240 | - | Apr 26, 21:10 UTC | Apr 26, 23:10 UTC | 2h 0m |
| 2026-04-26 | CSS159 | EHU → DEL | Apr 26, 15:55 UTC | Apr 26, 18:15 UTC | 2h 20m |
| 2026-04-25 | CSS156 | LHE → EHU | Apr 25, 13:35 UTC | Apr 25, 16:05 UTC | 2h 30m |
| 2026-04-24 | CSS155 | EHU → LHE | Apr 24, 15:50 UTC | Apr 25, 11:30 UTC | 19h 40m |
| 2026-04-24 | CSS159 | EHU → DEL | Apr 24, 10:15 UTC | Apr 24, 12:50 UTC | 2h 35m |
| 2026-04-23 | CSS159 | EHU → DEL | Apr 23, 15:50 UTC | Apr 24, 12:50 UTC | 21h 0m |
| 2026-04-23 | CSS159 | EHU → DEL | Apr 23, 15:25 UTC | Apr 24, 12:50 UTC | 21h 25m |
| 2026-04-23 | CSS239 | ZUH → DEL | Apr 23, 10:50 UTC | Apr 23, 13:35 UTC | 2h 45m |
| 2026-04-23 | CSS240 | - | Apr 23, 00:40 UTC | Apr 23, 02:50 UTC | 2h 10m |
| 2026-04-22 | CSS161 | EHU → DEL | Apr 22, 06:10 UTC | Apr 22, 22:35 UTC | 16h 25m |
| 2026-04-21 | CSS167 | - | Apr 21, 14:50 UTC | Apr 22, 03:50 UTC | 13h 0m |
| 2026-04-21 | CSS239 | ZUH → DEL | Apr 21, 10:05 UTC | Apr 21, 12:55 UTC | 2h 50m |
| 2026-04-21 | CSS240 | - | Apr 21, 00:05 UTC | Apr 21, 02:15 UTC | 2h 10m |
| 2026-04-20 | CSS161 | EHU → DEL | Apr 20, 19:35 UTC | Apr 20, 22:15 UTC | 2h 40m |
| 2026-04-19 | CSS161 | EHU → DEL | Apr 19, 22:10 UTC | Apr 20, 21:45 UTC | 23h 35m |
| 2026-04-19 | CSS174 | - | Apr 19, 21:10 UTC | Apr 20, 19:45 UTC | 22h 35m |
| 2026-04-19 | CSS173 | - | Apr 19, 16:00 UTC | Apr 19, 18:50 UTC | 2h 50m |
| 2026-04-18 | CSS156 | LHE → EHU | Apr 18, 13:10 UTC | Apr 18, 15:20 UTC | 2h 10m |
| 2026-04-18 | CSS155 | EHU → LHE | Apr 18, 08:35 UTC | Apr 18, 09:20 UTC | 45m |
| 2026-04-17 | CSS170 | - | Apr 17, 17:25 UTC | Apr 17, 18:15 UTC | 50m |
| 2026-04-17 | CSS155 | EHU → LHE | Apr 17, 16:40 UTC | Apr 18, 11:00 UTC | 18h 21m |
| 2026-04-17 | CSS169 | EHU → MAA | Apr 17, 11:20 UTC | Apr 17, 12:50 UTC | 1h 30m |
| 2026-04-17 | CSS162 | DEL → EHU | Apr 17, 01:20 UTC | Apr 17, 02:25 UTC | 1h 5m |
| 2026-04-17 | CSS162 | DEL → EHU | Apr 17, 00:30 UTC | Apr 17, 01:15 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-20A2 page for operator, model, and routing details .