sensors Mode-S transponder
781C1F
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-220Z · BOEING 757-200
- Hex
- 781C1F
- Octal
- 36016037
- Decimal
- 7,871,519
- Country
- CN
- Tail
- B-220Z
- Type
- B752
- Flights observed
- 64
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 7h ago
Last known position
Country allocation
The ICAO 24-bit address 781C1F 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 |
|---|---|---|---|
| YZR7912 | Yangtze River Express | 15 | 2026-04-24 |
| YZR7911 | Yangtze River Express | 13 | 2026-04-24 |
| CSS7410 | SF Airlines | 6 | 2026-05-26 |
| CSS7409 | - | 3 | 2026-05-27 |
| CSS7277 | - | 3 | 2026-05-12 |
| CSS6839 | SF Airlines | 3 | 2026-05-12 |
| CSS6840 | SF Airlines | 2 | 2026-05-08 |
| CSS326 | SF Airlines | 2 | 2026-05-29 |
| CSS314 | - | 2 | 2026-05-29 |
| CSS313 | SF Airlines | 2 | 2026-05-29 |
| CSS7413 | - | 1 | 2026-05-20 |
| CSS7278 | - | 1 | 2026-05-08 |
| CSS6864 | SF Airlines | 1 | 2026-04-18 |
| CSS6813 | SF Airlines | 1 | 2026-05-29 |
| CSS6806 | SF Airlines | 1 | 2026-05-18 |
| CSS6804 | SF Airlines | 1 | 2026-05-04 |
| CSS358 | SF Airlines | 1 | 2026-05-28 |
| CSS357 | SF Airlines | 1 | 2026-05-27 |
| CSS325 | SF Airlines | 1 | 2026-05-28 |
| CSS280 | SF Airlines | 1 | 2026-04-27 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CSS6813 | SZX → PEK | May 29, 19:05 UTC | May 29, 19:20 UTC | 15m |
| 2026-05-29 | CSS314 | - | May 29, 12:10 UTC | May 29, 12:20 UTC | 10m |
| 2026-05-29 | CSS314 | - | May 29, 09:45 UTC | May 29, 11:15 UTC | 1h 30m |
| 2026-05-29 | CSS313 | SZX → BKK | May 29, 06:25 UTC | May 29, 07:15 UTC | 50m |
| 2026-05-29 | CSS313 | SZX → BKK | May 29, 04:55 UTC | May 29, 05:05 UTC | 10m |
| 2026-05-29 | CSS326 | MNL → SZX | May 29, 01:15 UTC | May 29, 01:35 UTC | 20m |
| 2026-05-28 | CSS326 | MNL → SZX | May 28, 23:25 UTC | May 29, 00:00 UTC | 35m |
| 2026-05-28 | CSS325 | SZX → MNL | May 28, 16:40 UTC | May 28, 18:35 UTC | 1h 55m |
| 2026-05-28 | CSS358 | TPE → SZX | May 28, 01:15 UTC | May 28, 02:30 UTC | 1h 15m |
| 2026-05-27 | CSS357 | SZX → TPE | May 27, 22:10 UTC | May 27, 23:45 UTC | 1h 35m |
| 2026-05-27 | CSS7409 | - | May 27, 17:55 UTC | May 27, 18:10 UTC | 15m |
| 2026-05-26 | CSS7410 | SZX → CTU | May 26, 19:20 UTC | May 26, 19:30 UTC | 10m |
| 2026-05-26 | CSS7409 | - | May 26, 17:50 UTC | May 26, 17:59 UTC | 10m |
| 2026-05-25 | CSS7410 | SZX → CTU | May 25, 19:25 UTC | May 25, 19:40 UTC | 15m |
| 2026-05-22 | CSS7410 | SZX → CTU | May 22, 19:45 UTC | May 22, 20:00 UTC | 15m |
| 2026-05-22 | CSS7409 | - | May 22, 17:50 UTC | May 22, 18:10 UTC | 20m |
| 2026-05-21 | CSS7410 | SZX → CTU | May 21, 20:45 UTC | May 21, 21:00 UTC | 15m |
| 2026-05-20 | CSS7410 | SZX → CTU | May 20, 23:45 UTC | May 21, 00:00 UTC | 15m |
| 2026-05-20 | CSS7413 | - | May 20, 21:50 UTC | May 20, 22:00 UTC | 10m |
| 2026-05-19 | CSS7410 | SZX → CTU | May 19, 19:20 UTC | May 19, 19:35 UTC | 15m |
| 2026-05-18 | CSS6806 | EHU → SZX | May 18, 23:00 UTC | May 18, 23:20 UTC | 20m |
| 2026-05-12 | CSS6839 | SZX → WUX | May 12, 21:40 UTC | May 12, 21:50 UTC | 10m |
| 2026-05-12 | CSS7277 | - | May 12, 18:40 UTC | May 12, 19:35 UTC | 55m |
| 2026-05-08 | CSS7278 | - | May 8, 20:55 UTC | May 8, 21:05 UTC | 10m |
| 2026-05-08 | CSS6840 | WUX → SZX | May 8, 18:35 UTC | May 8, 19:00 UTC | 25m |
| 2026-05-07 | CSS6839 | SZX → WUX | May 7, 21:20 UTC | May 7, 21:35 UTC | 15m |
| 2026-05-07 | CSS7277 | - | May 7, 18:15 UTC | May 7, 19:25 UTC | 1h 10m |
| 2026-05-06 | CSS7277 | - | May 6, 20:45 UTC | May 7, 19:25 UTC | 22h 40m |
| 2026-05-06 | CSS6840 | WUX → SZX | May 6, 18:50 UTC | May 6, 19:05 UTC | 15m |
| 2026-05-05 | CSS6839 | SZX → WUX | May 5, 21:40 UTC | May 5, 21:50 UTC | 10m |
| 2026-05-04 | CSS6804 | EHU → SZX | May 4, 21:45 UTC | May 4, 22:05 UTC | 20m |
| 2026-04-27 | CSS142 | ICN → EHU | Apr 27, 14:55 UTC | Apr 27, 15:15 UTC | 20m |
| 2026-04-27 | CSS279 | YNT → ICN | Apr 27, 06:10 UTC | Apr 27, 06:35 UTC | 25m |
| 2026-04-27 | CSS280 | ICN → YNT | Apr 27, 03:10 UTC | Apr 27, 03:30 UTC | 20m |
| 2026-04-25 | CSS141 | EHU → ICN | Apr 25, 23:05 UTC | Apr 25, 23:25 UTC | 20m |
| 2026-04-24 | YZR7912 | TPE → CAN | Apr 24, 22:00 UTC | Apr 24, 22:25 UTC | 25m |
| 2026-04-24 | YZR7912 | TPE → CAN | Apr 24, 20:50 UTC | Apr 24, 21:25 UTC | 35m |
| 2026-04-24 | YZR7911 | CAN → TPE | Apr 24, 18:20 UTC | Apr 24, 19:40 UTC | 1h 20m |
| 2026-04-23 | YZR7912 | TPE → CAN | Apr 23, 20:45 UTC | Apr 23, 22:10 UTC | 1h 25m |
| 2026-04-23 | YZR7911 | CAN → TPE | Apr 23, 18:10 UTC | Apr 23, 19:35 UTC | 1h 25m |
| 2026-04-22 | YZR7912 | TPE → CAN | Apr 22, 21:05 UTC | Apr 22, 22:25 UTC | 1h 20m |
| 2026-04-22 | YZR7911 | CAN → TPE | Apr 22, 18:00 UTC | Apr 22, 19:25 UTC | 1h 25m |
| 2026-04-21 | YZR7912 | TPE → CAN | Apr 21, 20:25 UTC | Apr 21, 21:40 UTC | 1h 15m |
| 2026-04-21 | YZR7911 | CAN → TPE | Apr 21, 17:50 UTC | Apr 21, 19:15 UTC | 1h 25m |
| 2026-04-20 | YZR7912 | TPE → CAN | Apr 20, 20:40 UTC | Apr 20, 21:50 UTC | 1h 10m |
| 2026-04-20 | YZR7911 | CAN → TPE | Apr 20, 17:55 UTC | Apr 20, 19:20 UTC | 1h 25m |
| 2026-04-18 | CSS6864 | EHU → CAN | Apr 18, 21:25 UTC | Apr 18, 21:35 UTC | 10m |
| 2026-04-17 | YZR7912 | TPE → CAN | Apr 17, 21:30 UTC | Apr 17, 21:55 UTC | 25m |
| 2026-04-17 | YZR7912 | TPE → CAN | Apr 17, 20:30 UTC | Apr 17, 21:00 UTC | 30m |
| 2026-04-17 | YZR7911 | CAN → TPE | Apr 17, 17:55 UTC | Apr 17, 19:15 UTC | 1h 20m |
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-220Z page for operator, model, and routing details .