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
- 91
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 3h 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 |
|---|---|---|---|
| CSS363 | SF Airlines | 6 | 2026-06-27 |
| CSS239 | SF Airlines | 6 | 2026-04-27 |
| CSS364 | - | 5 | 2026-06-27 |
| CSS240 | - | 5 | 2026-04-26 |
| CSS161 | SF Airlines | 5 | 2026-04-22 |
| CSS7635 | - | 4 | 2026-07-06 |
| CSS257 | - | 4 | 2026-06-13 |
| CSS159 | SF Airlines | 4 | 2026-04-26 |
| CSS6801 | SF Airlines | 3 | 2026-06-24 |
| CSS258 | - | 3 | 2026-06-13 |
| CSS155 | SF Airlines | 3 | 2026-04-24 |
| CSS7103 | - | 2 | 2026-07-08 |
| CSS6803 | - | 2 | 2026-06-27 |
| CSS358 | - | 2 | 2026-07-14 |
| CSS310 | SF Airlines | 2 | 2026-05-29 |
| CSS309 | SF Airlines | 2 | 2026-05-29 |
| CSS163 | SF Airlines | 2 | 2026-04-14 |
| CSS162 | SF Airlines | 2 | 2026-04-17 |
| CSS156 | SF Airlines | 2 | 2026-04-25 |
| CSS7636 | - | 1 | 2026-06-29 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | CSS358 | - | Jul 14, 02:10 UTC | Jul 14, 03:25 UTC | 1h 15m |
| 2026-07-13 | CSS357 | - | Jul 13, 22:10 UTC | Jul 13, 23:40 UTC | 1h 30m |
| 2026-07-08 | CSS7103 | - | Jul 8, 17:00 UTC | Jul 8, 17:15 UTC | 15m |
| 2026-07-06 | CSS7635 | - | Jul 6, 22:55 UTC | Jul 7, 16:40 UTC | 17h 45m |
| 2026-06-29 | CSS7636 | - | Jun 29, 21:54 UTC | Jun 30, 16:40 UTC | 18h 46m |
| 2026-06-28 | CSS6839 | - | Jun 28, 22:49 UTC | Jun 28, 22:59 UTC | 10m |
| 2026-06-28 | CSS6806 | - | Jun 28, 20:39 UTC | Jun 28, 20:50 UTC | 10m |
| 2026-06-27 | CSS6803 | - | Jun 27, 17:39 UTC | Jun 27, 17:49 UTC | 10m |
| 2026-06-27 | CSS364 | - | Jun 27, 04:19 UTC | Jun 27, 05:55 UTC | 1h 35m |
| 2026-06-27 | CSS363 | SZX → NRT | Jun 27, 00:55 UTC | Jun 27, 02:29 UTC | 1h 35m |
| 2026-06-25 | - | - | Jun 25, 23:19 UTC | Jun 25, 23:34 UTC | 15m |
| 2026-06-25 | CSS302 | - | Jun 25, 19:54 UTC | Jun 25, 20:25 UTC | 30m |
| 2026-06-25 | CSS301 | - | Jun 25, 14:59 UTC | Jun 25, 15:10 UTC | 10m |
| 2026-06-24 | CSS6801 | SZX → EHU | Jun 24, 17:59 UTC | Jun 24, 18:09 UTC | 10m |
| 2026-06-23 | CSS7635 | - | Jun 23, 16:35 UTC | Jun 23, 16:50 UTC | 15m |
| 2026-06-21 | CSS7635 | - | Jun 21, 21:54 UTC | Jun 22, 16:24 UTC | 18h 30m |
| 2026-06-21 | CSS6803 | - | Jun 21, 17:29 UTC | Jun 21, 17:39 UTC | 10m |
| 2026-06-13 | CSS258 | - | Jun 13, 07:00 UTC | Jun 13, 07:35 UTC | 35m |
| 2026-06-13 | CSS257 | - | Jun 13, 04:30 UTC | Jun 13, 05:10 UTC | 40m |
| 2026-06-11 | CSS7104 | EHU → PEK | Jun 11, 21:45 UTC | Jun 11, 21:55 UTC | 10m |
| 2026-06-08 | CSS7103 | PEK → EHU | Jun 8, 17:00 UTC | Jun 8, 17:15 UTC | 15m |
| 2026-06-06 | CSS258 | - | Jun 6, 06:55 UTC | Jun 6, 07:05 UTC | 10m |
| 2026-06-06 | CSS257 | - | Jun 6, 04:55 UTC | Jun 6, 05:15 UTC | 20m |
| 2026-06-02 | CSS6805 | SZX → EHU | Jun 2, 16:40 UTC | Jun 2, 16:50 UTC | 10m |
| 2026-06-01 | CSS3005 | - | Jun 1, 09:20 UTC | Jun 1, 09:40 UTC | 20m |
| 2026-06-01 | CSS364 | NRT → SZX | Jun 1, 01:20 UTC | Jun 1, 02:40 UTC | 1h 20m |
| 2026-05-31 | CSS363 | SZX → NRT | May 31, 21:40 UTC | May 31, 23:05 UTC | 1h 25m |
| 2026-05-31 | CSS363 | SZX → NRT | May 31, 19:15 UTC | May 31, 19:30 UTC | 15m |
| 2026-05-30 | CSS6836 | HGH → SZX | May 30, 21:45 UTC | May 30, 22:30 UTC | 45m |
| 2026-05-30 | CSS7224 | SZX → HGH | May 30, 17:35 UTC | May 30, 17:45 UTC | 10m |
| 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 |
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 .