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
- 102
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 16m ago
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 | China Cargo Airlines | 14 | 2026-05-29 |
| CKK225 | China Cargo Airlines | 12 | 2026-04-28 |
| CKK602 | - | 10 | 2026-05-24 |
| CKK228 | China Cargo Airlines | 7 | 2026-05-30 |
| CKK209 | China Cargo Airlines | 7 | 2026-05-01 |
| CKK601 | - | 6 | 2026-05-24 |
| CKK231 | - | 6 | 2026-04-13 |
| CKK226 | China Cargo Airlines | 5 | 2026-04-28 |
| CKK235 | - | 4 | 2026-05-17 |
| CKK224 | China Cargo Airlines | 4 | 2026-05-26 |
| CKK210 | China Cargo Airlines | 4 | 2026-05-01 |
| CKK203 | - | 4 | 2026-04-18 |
| CKK236 | China Cargo Airlines | 3 | 2026-05-18 |
| CKK223 | China Cargo Airlines | 3 | 2026-05-25 |
| CKK287 | China Cargo Airlines | 2 | 2026-04-30 |
| CKK228A | China Cargo Airlines | 2 | 2026-04-20 |
| CKK216 | China Cargo Airlines | 2 | 2026-05-10 |
| CKK215 | China Cargo Airlines | 2 | 2026-05-09 |
| CKK204 | - | 2 | 2026-04-18 |
| CKK257 | China Cargo Airlines | 1 | 2026-05-08 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | CKK228 | ORD → PVG | May 30, 02:20 UTC | May 30, 04:00 UTC | 1h 40m |
| 2026-05-29 | CKK227 | PVG → ANC | May 29, 17:55 UTC | May 29, 23:40 UTC | 5h 45m |
| 2026-05-29 | CKK227 | PVG → ANC | May 29, 01:20 UTC | May 29, 15:35 UTC | 14h 15m |
| 2026-05-28 | CKK241 | PVG → NRT | May 28, 09:45 UTC | May 28, 22:50 UTC | 13h 5m |
| 2026-05-27 | CKK228 | ORD → PVG | May 27, 22:05 UTC | May 28, 22:00 UTC | 23h 55m |
| 2026-05-27 | CKK228 | ORD → PVG | May 27, 20:50 UTC | May 28, 09:45 UTC | 12h 55m |
| 2026-05-27 | CKK227 | PVG → ANC | May 27, 12:45 UTC | May 27, 18:10 UTC | 5h 25m |
| 2026-05-26 | CKK227 | PVG → ANC | May 26, 20:09 UTC | May 27, 11:05 UTC | 14h 56m |
| 2026-05-26 | CKK224 | LAX → PVG | May 26, 10:05 UTC | May 27, 10:00 UTC | 23h 55m |
| 2026-05-26 | CKK224 | LAX → PVG | May 26, 09:29 UTC | May 27, 05:19 UTC | 19h 50m |
| 2026-05-25 | CKK223 | PVG → LAX | May 25, 20:45 UTC | May 26, 07:19 UTC | 10h 35m |
| 2026-05-24 | CKK602 | - | May 24, 15:35 UTC | May 24, 21:45 UTC | 6h 10m |
| 2026-05-24 | CKK601 | - | May 24, 12:30 UTC | May 24, 12:40 UTC | 10m |
| 2026-05-23 | CKK602 | - | May 23, 14:05 UTC | May 24, 09:30 UTC | 19h 25m |
| 2026-05-23 | CKK602 | - | May 23, 13:00 UTC | May 24, 09:30 UTC | 20h 30m |
| 2026-05-23 | CKK601 | - | May 23, 01:20 UTC | May 23, 05:05 UTC | 3h 44m |
| 2026-05-21 | CKK602 | - | May 21, 11:25 UTC | May 21, 17:25 UTC | 6h 0m |
| 2026-05-21 | CKK601 | - | May 21, 07:45 UTC | May 21, 07:50 UTC | 5m |
| 2026-05-20 | CKK602 | - | May 20, 10:05 UTC | May 21, 04:30 UTC | 18h 25m |
| 2026-05-20 | CKK602 | - | May 20, 08:45 UTC | May 21, 04:30 UTC | 19h 45m |
| 2026-05-19 | CKK601 | - | May 19, 23:25 UTC | May 20, 06:00 UTC | 6h 36m |
| 2026-05-18 | CKK236 | LAX → CKG | May 18, 12:25 UTC | May 18, 18:25 UTC | 6h 0m |
| 2026-05-17 | CKK235 | - | May 17, 14:15 UTC | May 18, 09:15 UTC | 19h 0m |
| 2026-05-17 | CKK602 | - | May 17, 12:05 UTC | May 18, 09:15 UTC | 21h 10m |
| 2026-05-17 | CKK602 | - | May 17, 10:05 UTC | May 18, 09:15 UTC | 23h 10m |
| 2026-05-17 | CKK602 | - | May 17, 08:45 UTC | May 18, 05:35 UTC | 20h 50m |
| 2026-05-17 | CKK601 | - | May 17, 01:20 UTC | May 17, 05:35 UTC | 4h 15m |
| 2026-05-15 | CKK236 | LAX → CKG | May 15, 15:25 UTC | May 15, 17:50 UTC | 2h 25m |
| 2026-05-15 | CKK235 | - | May 15, 05:00 UTC | May 15, 08:50 UTC | 3h 50m |
| 2026-05-13 | CKK236 | LAX → CKG | May 13, 12:30 UTC | May 13, 18:30 UTC | 6h 0m |
| 2026-05-12 | CKK235 | - | May 12, 14:15 UTC | May 13, 09:20 UTC | 19h 5m |
| 2026-05-12 | CKK235 | - | May 12, 10:05 UTC | May 13, 09:20 UTC | 23h 15m |
| 2026-05-12 | CKK602 | - | May 12, 08:55 UTC | May 13, 06:25 UTC | 21h 30m |
| 2026-05-12 | CKK601 | - | May 12, 05:25 UTC | May 12, 05:40 UTC | 15m |
| 2026-05-10 | CKK216 | CDG → PVG | May 10, 16:44 UTC | May 10, 22:30 UTC | 5h 45m |
| 2026-05-09 | CKK215 | PVG → CDG | May 9, 20:15 UTC | May 10, 13:40 UTC | 17h 25m |
| 2026-05-08 | CKK257 | PVG → ICN | May 8, 22:05 UTC | May 9, 17:45 UTC | 19h 40m |
| 2026-05-08 | CKK228 | ORD → PVG | May 8, 20:30 UTC | May 9, 17:45 UTC | 21h 15m |
| 2026-05-08 | CKK227 | PVG → ANC | May 8, 12:20 UTC | May 8, 17:40 UTC | 5h 20m |
| 2026-05-08 | CKK227 | PVG → ANC | May 8, 04:04 UTC | May 8, 10:54 UTC | 6h 50m |
| 2026-05-05 | CKK216 | CDG → PVG | May 5, 16:35 UTC | May 6, 01:05 UTC | 8h 30m |
| 2026-05-05 | CKK215 | PVG → CDG | May 5, 03:40 UTC | May 5, 14:05 UTC | 10h 25m |
| 2026-05-02 | CKK228 | ORD → PVG | May 2, 21:05 UTC | May 3, 09:55 UTC | 12h 49m |
| 2026-05-02 | CKK227 | PVG → ANC | May 2, 12:55 UTC | May 2, 18:15 UTC | 5h 20m |
| 2026-05-01 | CKK227 | PVG → ANC | May 1, 17:20 UTC | May 2, 11:30 UTC | 18h 10m |
| 2026-05-01 | CKK227 | PVG → ANC | May 1, 14:05 UTC | May 2, 11:30 UTC | 21h 25m |
| 2026-05-01 | CKK210 | AMS → PVG | May 1, 12:05 UTC | May 2, 11:30 UTC | 23h 25m |
| 2026-05-01 | CKK210 | AMS → PVG | May 1, 11:55 UTC | May 2, 10:00 UTC | 22h 5m |
| 2026-05-01 | CKK209 | PVG → PVG | May 1, 02:10 UTC | May 1, 08:35 UTC | 6h 25m |
| 2026-04-30 | CKK209 | PVG → PVG | Apr 30, 08:50 UTC | May 1, 08:00 UTC | 23h 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-223F page for operator, model, and routing details .