sensors Mode-S transponder
781E2B
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-222J · BOEING 777-200LR
- Hex
- 781E2B
- Octal
- 36017053
- Decimal
- 7,872,043
- Country
- CN
- Tail
- B-222J
- Type
- B77L
- Flights observed
- 223
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- Jul 26, 21:55 UTC
Last known position
Country allocation
The ICAO 24-bit address 781E2B 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 | 25 | 2026-06-29 |
| CKK225 | - | 17 | 2026-07-13 |
| CKK222 | - | 15 | 2026-07-18 |
| CKK221 | China Cargo Airlines | 15 | 2026-07-26 |
| CKK205 | China Cargo Airlines | 13 | 2026-07-24 |
| CKK236 | - | 11 | 2026-06-24 |
| CKK235 | - | 11 | 2026-06-24 |
| CKK231 | - | 11 | 2026-07-19 |
| CKK206 | China Cargo Airlines | 11 | 2026-07-25 |
| CKK228 | - | 10 | 2026-06-29 |
| CKK203 | - | 9 | 2026-07-15 |
| CKK223 | China Cargo Airlines | 8 | 2026-05-31 |
| CKK602 | - | 7 | 2026-06-25 |
| CKK601 | - | 7 | 2026-06-25 |
| CKK204 | - | 6 | 2026-07-15 |
| CKK606 | - | 5 | 2026-07-23 |
| CKK226 | - | 5 | 2026-07-13 |
| CKK288 | - | 4 | 2026-07-03 |
| CKK232 | - | 4 | 2026-07-19 |
| CKK224 | China Cargo Airlines | 4 | 2026-06-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | CKK221 | PVG → LAX | Jul 26, 10:45 UTC | Jul 26, 21:55 UTC | 11h 10m |
| 2026-07-25 | CKK221 | PVG → LAX | Jul 25, 21:50 UTC | Jul 26, 20:45 UTC | 22h 56m |
| 2026-07-25 | CKK206 | AMS → PVG | Jul 25, 16:50 UTC | Jul 26, 12:30 UTC | 19h 41m |
| 2026-07-25 | CKK206 | AMS → PVG | Jul 25, 16:30 UTC | Jul 26, 12:30 UTC | 20h 1m |
| 2026-07-24 | CKK205 | PVG → AMS | Jul 24, 21:40 UTC | Jul 25, 13:40 UTC | 16h 0m |
| 2026-07-24 | CKK257 | PVG → ICN | Jul 24, 18:35 UTC | Jul 24, 19:20 UTC | 45m |
| 2026-07-23 | CKK257 | PVG → ICN | Jul 23, 20:55 UTC | Jul 24, 19:20 UTC | 22h 25m |
| 2026-07-23 | CKK606 | - | Jul 23, 11:40 UTC | Jul 23, 21:05 UTC | 9h 25m |
| 2026-07-23 | CKK605 | - | Jul 23, 01:50 UTC | Jul 23, 08:20 UTC | 6h 30m |
| 2026-07-19 | CKK232 | - | Jul 19, 21:30 UTC | Jul 20, 11:10 UTC | 13h 40m |
| 2026-07-19 | CKK231 | - | Jul 19, 09:45 UTC | Jul 19, 16:00 UTC | 6h 15m |
| 2026-07-19 | CKK231 | - | Jul 19, 00:45 UTC | Jul 19, 08:10 UTC | 7h 25m |
| 2026-07-18 | CKK231 | - | Jul 18, 10:50 UTC | Jul 19, 08:10 UTC | 21h 20m |
| 2026-07-18 | CKK231 | - | Jul 18, 10:20 UTC | Jul 19, 08:10 UTC | 21h 50m |
| 2026-07-18 | CKK222 | - | Jul 18, 00:55 UTC | Jul 19, 00:45 UTC | 23h 51m |
| 2026-07-17 | CKK221 | - | Jul 17, 02:50 UTC | Jul 17, 22:20 UTC | 19h 30m |
| 2026-07-17 | CKK221 | - | Jul 17, 01:25 UTC | Jul 17, 22:20 UTC | 20h 55m |
| 2026-07-16 | CKK241 | - | Jul 16, 21:15 UTC | Jul 16, 22:59 UTC | 1h 45m |
| 2026-07-15 | CKK204 | - | Jul 15, 13:05 UTC | Jul 15, 19:40 UTC | 6h 35m |
| 2026-07-15 | CKK203 | - | Jul 15, 02:30 UTC | Jul 15, 09:15 UTC | 6h 45m |
| 2026-07-14 | CKK203 | - | Jul 14, 04:50 UTC | Jul 15, 03:15 UTC | 22h 24m |
| 2026-07-13 | CKK226 | - | Jul 13, 15:50 UTC | Jul 14, 04:50 UTC | 13h 0m |
| 2026-07-13 | CKK225 | ANC → ORD | Jul 13, 07:01 UTC | Jul 13, 12:25 UTC | 5h 25m |
| 2026-07-12 | CKK225 | - | Jul 12, 22:35 UTC | Jul 13, 05:55 UTC | 7h 20m |
| 2026-07-12 | CKK225 | - | Jul 12, 06:40 UTC | Jul 13, 04:40 UTC | 22h 0m |
| 2026-07-12 | CKK225 | - | Jul 12, 03:20 UTC | Jul 13, 00:15 UTC | 20h 55m |
| 2026-07-12 | CKK606 | - | Jul 12, 00:50 UTC | Jul 13, 00:15 UTC | 23h 25m |
| 2026-07-11 | CKK606 | - | Jul 11, 22:50 UTC | Jul 12, 22:45 UTC | 23h 55m |
| 2026-07-11 | CKK606 | - | Jul 11, 21:45 UTC | Jul 12, 06:45 UTC | 9h 0m |
| 2026-07-11 | CKK605 | - | Jul 11, 01:40 UTC | Jul 11, 08:20 UTC | 6h 40m |
| 2026-07-10 | CKK278 | - | Jul 10, 04:45 UTC | Jul 10, 05:05 UTC | 20m |
| 2026-07-09 | CKK222 | - | Jul 9, 10:30 UTC | Jul 10, 01:35 UTC | 15h 5m |
| 2026-07-09 | CKK222 | - | Jul 9, 00:50 UTC | Jul 9, 23:50 UTC | 23h 0m |
| 2026-07-09 | CKK222 | - | Jul 9, 00:20 UTC | Jul 9, 12:25 UTC | 12h 5m |
| 2026-07-08 | CKK221 | PVG → LAX | Jul 8, 10:55 UTC | Jul 8, 21:45 UTC | 10h 50m |
| 2026-07-07 | CKK206 | AMS → PVG | Jul 7, 16:20 UTC | Jul 7, 22:15 UTC | 5h 55m |
| 2026-07-07 | CKK205 | - | Jul 7, 07:05 UTC | Jul 7, 13:40 UTC | 6h 35m |
| 2026-07-04 | CKK226 | - | Jul 4, 20:35 UTC | Jul 5, 09:30 UTC | 12h 55m |
| 2026-07-04 | CKK225 | PVG → LAX | Jul 4, 10:10 UTC | Jul 4, 15:45 UTC | 5h 35m |
| 2026-07-03 | CKK225 | PVG → LAX | Jul 3, 16:25 UTC | Jul 4, 08:30 UTC | 16h 5m |
| 2026-07-03 | CKK288 | - | Jul 3, 10:40 UTC | Jul 3, 14:00 UTC | 3h 20m |
| 2026-07-02 | CKK287 | - | Jul 2, 14:25 UTC | Jul 3, 08:25 UTC | 18h 0m |
| 2026-07-02 | CKK232 | - | Jul 2, 01:25 UTC | Jul 2, 15:05 UTC | 13h 40m |
| 2026-07-01 | CKK231 | ANC → JFK | Jul 1, 15:40 UTC | Jul 1, 22:20 UTC | 6h 40m |
| 2026-06-30 | CKK231 | - | Jun 30, 22:50 UTC | Jul 1, 14:20 UTC | 15h 30m |
| 2026-06-29 | CKK257 | - | Jun 29, 22:49 UTC | Jun 30, 17:55 UTC | 19h 6m |
| 2026-06-29 | CKK228 | - | Jun 29, 21:19 UTC | Jun 30, 17:55 UTC | 20h 36m |
| 2026-06-29 | CKK227 | PVG → ANC | Jun 29, 12:39 UTC | Jun 29, 18:25 UTC | 5h 45m |
| 2026-06-29 | CKK227 | PVG → ANC | Jun 29, 04:00 UTC | Jun 29, 11:14 UTC | 7h 15m |
| 2026-06-28 | CKK227 | PVG → ANC | Jun 28, 15:05 UTC | Jun 29, 11:14 UTC | 20h 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-222J page for operator, model, and routing details .