sensors Mode-S transponder
781B4B
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-220R · BOEING 767-300
- Hex
- 781B4B
- Octal
- 36015513
- Decimal
- 7,871,307
- Country
- CN
- Tail
- B-220R
- Type
- B763
- Flights observed
- 77
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 18h ago
Last known position
Country allocation
The ICAO 24-bit address 781B4B 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 |
|---|---|---|---|
| CSS128 | - | 5 | 2026-05-19 |
| CSS127 | - | 5 | 2026-05-19 |
| CSS6802 | SF Airlines | 3 | 2026-05-27 |
| CSS335 | SF Airlines | 3 | 2026-05-28 |
| CSS254 | - | 3 | 2026-05-27 |
| CSS253 | - | 3 | 2026-05-27 |
| CSS240 | - | 3 | 2026-04-29 |
| CSS239 | SF Airlines | 3 | 2026-04-29 |
| CSS173 | - | 3 | 2026-04-30 |
| CSS168 | SF Airlines | 3 | 2026-04-18 |
| CSS155 | SF Airlines | 3 | 2026-05-08 |
| CSS6805 | SF Airlines | 2 | 2026-05-07 |
| CSS364 | SF Airlines | 2 | 2026-05-29 |
| CSS363 | SF Airlines | 2 | 2026-05-28 |
| CSS302 | SF Airlines | 2 | 2026-05-15 |
| CSS231 | SF Airlines | 2 | 2026-05-25 |
| CSS172 | - | 2 | 2026-05-22 |
| CSS167 | - | 2 | 2026-04-17 |
| CSS161 | SF Airlines | 2 | 2026-04-15 |
| CSS160 | SF Airlines | 2 | 2026-04-29 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CSS6809 | - | May 29, 17:35 UTC | May 29, 17:45 UTC | 10m |
| 2026-05-29 | CSS364 | NRT → SZX | May 29, 05:40 UTC | May 29, 05:50 UTC | 10m |
| 2026-05-29 | CSS364 | NRT → SZX | May 29, 01:25 UTC | May 29, 02:55 UTC | 1h 30m |
| 2026-05-28 | CSS363 | SZX → NRT | May 28, 22:10 UTC | May 28, 23:20 UTC | 1h 10m |
| 2026-05-28 | CSS363 | SZX → NRT | May 28, 19:40 UTC | May 28, 19:55 UTC | 15m |
| 2026-05-28 | CSS335 | SZX → MAA | May 28, 04:40 UTC | May 28, 14:10 UTC | 9h 30m |
| 2026-05-27 | CSS6802 | EHU → SZX | May 27, 22:00 UTC | May 27, 22:10 UTC | 10m |
| 2026-05-27 | CSS254 | - | May 27, 07:30 UTC | May 27, 10:15 UTC | 2h 45m |
| 2026-05-27 | CSS253 | - | May 27, 04:49 UTC | May 27, 05:14 UTC | 25m |
| 2026-05-27 | CSS253 | - | May 27, 02:54 UTC | May 27, 04:14 UTC | 1h 20m |
| 2026-05-25 | CSS232 | - | May 25, 06:55 UTC | May 25, 09:45 UTC | 2h 50m |
| 2026-05-25 | CSS231 | CTU → BOM | May 25, 04:45 UTC | May 25, 04:55 UTC | 10m |
| 2026-05-25 | CSS231 | CTU → BOM | May 25, 02:00 UTC | May 25, 02:55 UTC | 55m |
| 2026-05-22 | CSS172 | - | May 22, 09:10 UTC | May 22, 10:10 UTC | 1h 0m |
| 2026-05-22 | CSS172 | - | May 22, 00:50 UTC | May 22, 04:50 UTC | 4h 0m |
| 2026-05-21 | CSS171 | - | May 21, 19:40 UTC | May 21, 22:20 UTC | 2h 40m |
| 2026-05-19 | CSS128 | - | May 19, 23:35 UTC | May 20, 17:40 UTC | 18h 6m |
| 2026-05-19 | CSS128 | - | May 19, 18:50 UTC | May 20, 17:40 UTC | 22h 51m |
| 2026-05-19 | CSS128 | - | May 19, 18:35 UTC | May 20, 11:55 UTC | 17h 21m |
| 2026-05-19 | CSS127 | - | May 19, 07:30 UTC | May 19, 14:50 UTC | 7h 20m |
| 2026-05-18 | CSS127 | - | May 18, 12:50 UTC | May 19, 10:45 UTC | 21h 54m |
| 2026-05-18 | CSS128 | - | May 18, 11:05 UTC | May 19, 10:45 UTC | 23h 39m |
| 2026-05-18 | CSS127 | - | May 18, 07:40 UTC | May 18, 08:05 UTC | 25m |
| 2026-05-18 | CSS127 | - | May 18, 03:35 UTC | May 18, 05:00 UTC | 1h 25m |
| 2026-05-15 | CSS6801 | SZX → EHU | May 15, 17:45 UTC | May 15, 17:55 UTC | 10m |
| 2026-05-15 | CSS335 | SZX → MAA | May 15, 05:55 UTC | May 15, 12:55 UTC | 7h 0m |
| 2026-05-15 | CSS335 | SZX → MAA | May 15, 03:00 UTC | May 15, 03:15 UTC | 15m |
| 2026-05-15 | CSS302 | SIN → SZX | May 15, 00:45 UTC | May 15, 01:05 UTC | 20m |
| 2026-05-14 | CSS302 | SIN → SZX | May 14, 21:30 UTC | May 14, 21:50 UTC | 20m |
| 2026-05-14 | CSS301 | SZX → SIN | May 14, 15:45 UTC | May 14, 19:20 UTC | 3h 35m |
| 2026-05-13 | CSS6804 | EHU → SZX | May 13, 20:45 UTC | May 13, 20:55 UTC | 10m |
| 2026-05-09 | CSS156 | LHE → EHU | May 9, 12:35 UTC | May 9, 15:05 UTC | 2h 30m |
| 2026-05-08 | CSS155 | EHU → LHE | May 8, 16:55 UTC | May 9, 10:30 UTC | 17h 35m |
| 2026-05-08 | CSS155 | EHU → LHE | May 8, 12:49 UTC | May 9, 10:30 UTC | 21h 40m |
| 2026-05-08 | CSS155 | EHU → LHE | May 8, 11:25 UTC | May 9, 10:30 UTC | 23h 5m |
| 2026-05-07 | CSS6805 | SZX → EHU | May 7, 16:45 UTC | May 7, 16:55 UTC | 10m |
| 2026-05-06 | CSS6802 | EHU → SZX | May 6, 22:15 UTC | May 6, 22:25 UTC | 10m |
| 2026-05-04 | CSS6835 | SZX → HGH | May 4, 21:10 UTC | May 4, 21:20 UTC | 10m |
| 2026-05-04 | CSS7223 | HGH → SZX | May 4, 19:00 UTC | May 4, 19:15 UTC | 15m |
| 2026-05-01 | CSS158 | DEL → EHU | May 1, 12:45 UTC | May 1, 14:40 UTC | 1h 55m |
| 2026-04-30 | CSS157 | EHU → DEL | Apr 30, 21:40 UTC | May 1, 10:50 UTC | 13h 10m |
| 2026-04-30 | CSS173 | - | Apr 30, 18:35 UTC | Apr 30, 19:00 UTC | 25m |
| 2026-04-30 | CSS173 | - | Apr 30, 15:35 UTC | Apr 30, 17:30 UTC | 1h 55m |
| 2026-04-29 | CSS173 | - | Apr 29, 18:50 UTC | Apr 30, 17:30 UTC | 22h 40m |
| 2026-04-29 | CSS160 | DEL → EHU | Apr 29, 18:00 UTC | Apr 30, 16:45 UTC | 22h 44m |
| 2026-04-29 | CSS239 | ZUH → DEL | Apr 29, 10:05 UTC | Apr 29, 15:15 UTC | 5h 10m |
| 2026-04-29 | CSS240 | - | Apr 29, 03:00 UTC | Apr 29, 05:05 UTC | 2h 5m |
| 2026-04-28 | CSS163 | EHU → DEL | Apr 28, 21:30 UTC | Apr 29, 00:20 UTC | 2h 50m |
| 2026-04-27 | CSS160 | DEL → EHU | Apr 27, 16:45 UTC | Apr 27, 19:00 UTC | 2h 15m |
| 2026-04-26 | CSS159 | EHU → DEL | Apr 26, 18:50 UTC | Apr 27, 14:30 UTC | 19h 40m |
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-220R page for operator, model, and routing details .