sensors Mode-S transponder
781F00
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-223F · BOEING 777-200LR
- Hex
- 781F00
- Octal
- 36017400
- Decimal
- 7,872,256
- Country
- CN
- Tail
- B-223F
- Type
- B77L
- Flights observed
- 205
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- Jul 26, 14:30 UTC
Last known position
Country allocation
The ICAO 24-bit address 781F00 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 |
|---|---|---|---|
| CKK227 | - | 23 | 2026-07-15 |
| CKK225 | China Cargo Airlines | 14 | 2026-07-07 |
| CKK228 | - | 12 | 2026-07-16 |
| CKK224 | - | 12 | 2026-07-09 |
| CKK209 | China Cargo Airlines | 12 | 2026-07-17 |
| CKK602 | - | 11 | 2026-07-26 |
| CKK205 | China Cargo Airlines | 10 | 2026-07-18 |
| CKK231 | China Cargo Airlines | 8 | 2026-06-10 |
| CKK601 | - | 7 | 2026-07-26 |
| CKK226 | - | 7 | 2026-07-07 |
| CKK223 | - | 7 | 2026-07-08 |
| CKK221 | - | 6 | 2026-07-10 |
| CKK210 | China Cargo Airlines | 6 | 2026-07-17 |
| CKK621 | China Cargo Airlines | 4 | 2026-07-24 |
| CKK605 | - | 4 | 2026-07-13 |
| CKK235 | - | 4 | 2026-05-17 |
| CKK222A | - | 4 | 2026-07-12 |
| CKK206 | - | 4 | 2026-07-18 |
| CKK203 | - | 4 | 2026-04-18 |
| CKK606 | - | 3 | 2026-07-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | CKK602 | - | Jul 26, 08:45 UTC | Jul 26, 14:30 UTC | 5h 45m |
| 2026-07-26 | CKK601 | - | Jul 26, 01:40 UTC | Jul 26, 05:30 UTC | 3h 50m |
| 2026-07-24 | CKK622 | YYZ → CKG | Jul 24, 16:40 UTC | Jul 24, 17:20 UTC | 40m |
| 2026-07-24 | CKK621 | CKG → ANC | Jul 24, 08:05 UTC | Jul 24, 13:25 UTC | 5h 20m |
| 2026-07-23 | CKK621 | CKG → ANC | Jul 23, 23:30 UTC | Jul 24, 06:45 UTC | 7h 15m |
| 2026-07-22 | CKK622 | YYZ → CKG | Jul 22, 19:10 UTC | Jul 22, 19:50 UTC | 40m |
| 2026-07-22 | CKK621 | CKG → ANC | Jul 22, 11:10 UTC | Jul 22, 15:55 UTC | 4h 45m |
| 2026-07-22 | CKK621 | CKG → ANC | Jul 22, 02:10 UTC | Jul 22, 03:45 UTC | 1h 35m |
| 2026-07-20 | CKK216 | CDG → PVG | Jul 20, 12:15 UTC | Jul 20, 18:25 UTC | 6h 10m |
| 2026-07-19 | CKK215 | PVG → CDG | Jul 19, 15:55 UTC | Jul 20, 08:50 UTC | 16h 55m |
| 2026-07-19 | CKK274 | - | Jul 19, 13:55 UTC | Jul 19, 14:05 UTC | 10m |
| 2026-07-19 | CKK273 | - | Jul 19, 11:10 UTC | Jul 19, 11:25 UTC | 15m |
| 2026-07-18 | CKK206 | - | Jul 18, 17:10 UTC | Jul 19, 09:25 UTC | 16h 15m |
| 2026-07-18 | CKK205 | PVG → AMS | Jul 18, 08:20 UTC | Jul 18, 14:55 UTC | 6h 35m |
| 2026-07-17 | CKK205 | PVG → AMS | Jul 17, 18:05 UTC | Jul 18, 14:55 UTC | 20h 51m |
| 2026-07-17 | CKK205 | PVG → AMS | Jul 17, 17:25 UTC | Jul 18, 14:55 UTC | 21h 31m |
| 2026-07-17 | CKK205 | PVG → AMS | Jul 17, 14:04 UTC | Jul 18, 14:00 UTC | 23h 56m |
| 2026-07-17 | CKK210 | AMS → PVG | Jul 17, 12:10 UTC | Jul 18, 11:55 UTC | 23h 46m |
| 2026-07-17 | CKK209 | PVG → PVG | Jul 17, 02:20 UTC | Jul 17, 08:35 UTC | 6h 15m |
| 2026-07-16 | CKK209 | PVG → PVG | Jul 16, 12:05 UTC | Jul 17, 08:35 UTC | 20h 30m |
| 2026-07-16 | CKK209 | PVG → PVG | Jul 16, 11:45 UTC | Jul 17, 08:35 UTC | 20h 50m |
| 2026-07-16 | CKK228 | - | Jul 16, 06:05 UTC | Jul 17, 05:45 UTC | 23h 40m |
| 2026-07-16 | CKK228 | - | Jul 16, 04:05 UTC | Jul 17, 02:59 UTC | 22h 55m |
| 2026-07-16 | CKK228 | - | Jul 16, 00:00 UTC | Jul 16, 13:20 UTC | 13h 20m |
| 2026-07-15 | CKK227 | - | Jul 15, 14:35 UTC | Jul 15, 19:50 UTC | 5h 15m |
| 2026-07-14 | CKK227 | - | Jul 14, 18:05 UTC | Jul 15, 13:00 UTC | 18h 54m |
| 2026-07-14 | CKK227 | - | Jul 14, 16:05 UTC | Jul 15, 13:00 UTC | 20h 54m |
| 2026-07-14 | CKK227 | - | Jul 14, 14:05 UTC | Jul 15, 13:00 UTC | 22h 54m |
| 2026-07-14 | CKK606 | - | Jul 14, 12:05 UTC | Jul 15, 11:45 UTC | 23h 39m |
| 2026-07-14 | CKK606 | - | Jul 14, 11:45 UTC | Jul 15, 07:15 UTC | 19h 29m |
| 2026-07-13 | CKK605 | - | Jul 13, 12:20 UTC | Jul 14, 08:45 UTC | 20h 25m |
| 2026-07-13 | CKK605 | - | Jul 13, 08:05 UTC | Jul 14, 08:00 UTC | 23h 55m |
| 2026-07-13 | CKK216A | - | Jul 13, 07:01 UTC | Jul 14, 06:00 UTC | 23h 0m |
| 2026-07-12 | CKK215A | - | Jul 12, 18:25 UTC | Jul 13, 04:05 UTC | 9h 40m |
| 2026-07-12 | CKK215A | - | Jul 12, 06:05 UTC | Jul 13, 04:05 UTC | 22h 0m |
| 2026-07-12 | CKK215A | - | Jul 12, 05:20 UTC | Jul 13, 04:00 UTC | 22h 40m |
| 2026-07-12 | CKK222A | - | Jul 12, 00:05 UTC | Jul 13, 00:01 UTC | 23h 55m |
| 2026-07-11 | CKK222A | - | Jul 11, 22:05 UTC | Jul 12, 22:00 UTC | 23h 55m |
| 2026-07-11 | CKK222A | - | Jul 11, 20:05 UTC | Jul 12, 18:45 UTC | 22h 40m |
| 2026-07-11 | CKK222A | - | Jul 11, 19:10 UTC | Jul 12, 07:05 UTC | 11h 55m |
| 2026-07-10 | CKK221 | - | Jul 10, 08:00 UTC | Jul 10, 19:40 UTC | 11h 40m |
| 2026-07-09 | CKK221 | - | Jul 9, 22:05 UTC | Jul 10, 19:40 UTC | 21h 35m |
| 2026-07-09 | CKK221 | - | Jul 9, 21:40 UTC | Jul 10, 19:40 UTC | 22h 0m |
| 2026-07-09 | CKK224 | - | Jul 9, 15:35 UTC | Jul 10, 09:45 UTC | 18h 10m |
| 2026-07-09 | CKK224 | - | Jul 9, 12:05 UTC | Jul 10, 09:45 UTC | 21h 40m |
| 2026-07-09 | CKK224 | - | Jul 9, 11:15 UTC | Jul 10, 09:45 UTC | 22h 30m |
| 2026-07-08 | CKK223 | - | Jul 8, 21:55 UTC | Jul 9, 08:35 UTC | 10h 40m |
| 2026-07-08 | CKK223 | - | Jul 8, 05:50 UTC | Jul 8, 23:40 UTC | 17h 50m |
| 2026-07-07 | CKK226 | - | Jul 7, 23:30 UTC | Jul 8, 22:00 UTC | 22h 30m |
| 2026-07-07 | CKK226 | - | Jul 7, 17:25 UTC | Jul 8, 06:40 UTC | 13h 15m |
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-223F page for operator, model, and routing details .