sensors Mode-S transponder
781FD6
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-233W · BOEING 767-300
- Hex
- 781FD6
- Octal
- 36017726
- Decimal
- 7,872,470
- Country
- CN
- Tail
- B-233W
- Type
- B763
- Flights observed
- 77
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address 781FD6 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 |
|---|---|---|---|
| CSS161 | SF Airlines | 6 | 2026-05-20 |
| CSS159 | SF Airlines | 6 | 2026-05-16 |
| CSS122 | SF Airlines | 6 | 2026-05-19 |
| CSS121 | SF Airlines | 6 | 2026-05-19 |
| CSS301 | SF Airlines | 5 | 2026-06-02 |
| CSS170 | - | 5 | 2026-05-03 |
| CSS302 | SF Airlines | 4 | 2026-06-01 |
| CSS240 | - | 3 | 2026-05-21 |
| CSS239 | SF Airlines | 3 | 2026-05-21 |
| CSS148 | - | 3 | 2026-05-13 |
| CSS128 | - | 3 | 2026-05-11 |
| CSS127 | - | 3 | 2026-05-11 |
| CSS7103 | SF Airlines | 2 | 2026-04-24 |
| CSS6835 | SF Airlines | 2 | 2026-05-25 |
| CSS358 | SF Airlines | 2 | 2026-04-15 |
| CSS162 | SF Airlines | 2 | 2026-05-10 |
| CSS160 | SF Airlines | 2 | 2026-05-04 |
| CSS157 | SF Airlines | 2 | 2026-05-21 |
| CSS7223 | SF Airlines | 1 | 2026-05-25 |
| CSS6840 | SF Airlines | 1 | 2026-04-26 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | CSS301 | SZX → SIN | Jun 2, 17:15 UTC | Jun 2, 17:40 UTC | 25m |
| 2026-06-01 | CSS302 | SIN → SZX | Jun 1, 22:55 UTC | Jun 1, 23:05 UTC | 10m |
| 2026-06-01 | CSS302 | SIN → SZX | Jun 1, 19:30 UTC | Jun 1, 19:50 UTC | 20m |
| 2026-06-01 | CSS301 | SZX → SIN | Jun 1, 16:50 UTC | Jun 1, 17:05 UTC | 15m |
| 2026-06-01 | CSS301 | SZX → SIN | Jun 1, 14:05 UTC | Jun 1, 14:15 UTC | 10m |
| 2026-05-31 | CSS302 | SIN → SZX | May 31, 22:55 UTC | May 31, 23:10 UTC | 15m |
| 2026-05-31 | CSS302 | SIN → SZX | May 31, 19:30 UTC | May 31, 19:50 UTC | 20m |
| 2026-05-31 | CSS301 | SZX → SIN | May 31, 16:40 UTC | May 31, 17:10 UTC | 30m |
| 2026-05-31 | CSS301 | SZX → SIN | May 31, 13:50 UTC | May 31, 14:00 UTC | 10m |
| 2026-05-25 | CSS6835 | SZX → HGH | May 25, 21:09 UTC | May 25, 21:19 UTC | 10m |
| 2026-05-25 | CSS7223 | HGH → SZX | May 25, 18:50 UTC | May 25, 19:10 UTC | 20m |
| 2026-05-24 | CSS6835 | SZX → HGH | May 24, 20:50 UTC | May 24, 21:00 UTC | 10m |
| 2026-05-23 | CSS6802 | EHU → SZX | May 23, 21:50 UTC | May 23, 22:05 UTC | 15m |
| 2026-05-22 | CSS158 | DEL → EHU | May 22, 13:50 UTC | May 22, 16:15 UTC | 2h 25m |
| 2026-05-21 | CSS157 | EHU → DEL | May 21, 15:35 UTC | May 22, 10:15 UTC | 18h 40m |
| 2026-05-21 | CSS157 | EHU → DEL | May 21, 14:30 UTC | May 22, 10:15 UTC | 19h 45m |
| 2026-05-21 | CSS239 | ZUH → DEL | May 21, 10:15 UTC | May 21, 12:55 UTC | 2h 40m |
| 2026-05-21 | CSS240 | - | May 21, 00:30 UTC | May 21, 02:20 UTC | 1h 50m |
| 2026-05-20 | CSS161 | EHU → DEL | May 20, 20:25 UTC | May 20, 22:30 UTC | 2h 5m |
| 2026-05-19 | CSS161 | EHU → DEL | May 19, 22:25 UTC | May 20, 21:30 UTC | 23h 6m |
| 2026-05-19 | CSS122 | OSL → DAC | May 19, 15:30 UTC | May 19, 22:50 UTC | 7h 20m |
| 2026-05-19 | CSS121 | KGF → KGF | May 19, 05:05 UTC | May 19, 12:45 UTC | 7h 40m |
| 2026-05-18 | CSS168 | HAN → EHU | May 18, 02:30 UTC | May 18, 04:20 UTC | 1h 50m |
| 2026-05-17 | CSS167 | - | May 17, 10:45 UTC | May 17, 23:00 UTC | 12h 15m |
| 2026-05-17 | CSS239 | ZUH → DEL | May 17, 06:25 UTC | May 17, 08:35 UTC | 2h 10m |
| 2026-05-16 | CSS240 | - | May 16, 20:35 UTC | May 16, 22:25 UTC | 1h 50m |
| 2026-05-16 | CSS159 | EHU → DEL | May 16, 15:40 UTC | May 16, 18:30 UTC | 2h 50m |
| 2026-05-13 | CSS148 | - | May 13, 00:55 UTC | May 13, 18:00 UTC | 17h 5m |
| 2026-05-12 | CSS161 | EHU → DEL | May 12, 19:45 UTC | May 12, 22:35 UTC | 2h 50m |
| 2026-05-11 | CSS128 | - | May 11, 11:30 UTC | May 11, 13:35 UTC | 2h 5m |
| 2026-05-11 | CSS127 | - | May 11, 04:05 UTC | May 11, 08:00 UTC | 3h 55m |
| 2026-05-10 | CSS162 | DEL → EHU | May 10, 00:15 UTC | May 10, 02:24 UTC | 2h 10m |
| 2026-05-09 | CSS161 | EHU → DEL | May 9, 19:55 UTC | May 9, 22:39 UTC | 2h 45m |
| 2026-05-08 | CSS122 | OSL → DAC | May 8, 15:05 UTC | May 8, 17:05 UTC | 2h 0m |
| 2026-05-07 | CSS121 | KGF → KGF | May 7, 17:35 UTC | May 8, 13:00 UTC | 19h 25m |
| 2026-05-07 | CSS148 | - | May 7, 15:35 UTC | May 8, 13:00 UTC | 21h 25m |
| 2026-05-07 | CSS148 | - | May 7, 15:20 UTC | May 8, 13:00 UTC | 21h 40m |
| 2026-05-07 | CSS239 | ZUH → DEL | May 7, 10:40 UTC | May 7, 13:05 UTC | 2h 25m |
| 2026-05-07 | CSS240 | - | May 7, 00:40 UTC | May 7, 02:55 UTC | 2h 15m |
| 2026-05-06 | CSS161 | EHU → DEL | May 6, 20:30 UTC | May 6, 23:00 UTC | 2h 30m |
| 2026-05-05 | CSS122 | OSL → DAC | May 5, 21:35 UTC | May 6, 21:30 UTC | 23h 54m |
| 2026-05-05 | CSS122 | OSL → DAC | May 5, 21:20 UTC | May 5, 22:45 UTC | 1h 25m |
| 2026-05-05 | CSS121 | KGF → KGF | May 5, 10:00 UTC | May 5, 18:25 UTC | 8h 25m |
| 2026-05-04 | CSS121 | KGF → KGF | May 4, 21:35 UTC | May 5, 18:25 UTC | 20h 50m |
| 2026-05-04 | CSS160 | DEL → EHU | May 4, 20:20 UTC | May 5, 18:25 UTC | 22h 5m |
| 2026-05-04 | CSS159 | EHU → DEL | May 4, 15:50 UTC | May 4, 18:30 UTC | 2h 40m |
| 2026-05-03 | CSS159 | EHU → DEL | May 3, 17:35 UTC | May 4, 17:30 UTC | 23h 55m |
| 2026-05-03 | CSS170 | - | May 3, 12:45 UTC | May 3, 17:40 UTC | 4h 55m |
| 2026-05-03 | CSS162 | DEL → EHU | May 3, 00:40 UTC | May 3, 12:40 UTC | 11h 59m |
| 2026-05-02 | CSS161 | EHU → DEL | May 2, 20:00 UTC | May 2, 22:50 UTC | 2h 50m |
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-233W page for operator, model, and routing details .