sensors Mode-S transponder
781E2A
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-222H · BOEING 777-200LR
- Hex
- 781E2A
- Octal
- 36017052
- Decimal
- 7,872,042
- Country
- CN
- Tail
- B-222H
- Type
- B77L
- Flights observed
- 109
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 3h ago
Last known position
Country allocation
The ICAO 24-bit address 781E2A 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 |
|---|---|---|---|
| CKK602 | - | 14 | 2026-05-09 |
| CKK235 | - | 12 | 2026-05-09 |
| CKK601 | - | 11 | 2026-05-09 |
| CKK227 | China Cargo Airlines | 10 | 2026-05-25 |
| CKK222 | China Cargo Airlines | 8 | 2026-05-29 |
| CKK236 | China Cargo Airlines | 6 | 2026-05-10 |
| CKK225 | China Cargo Airlines | 6 | 2026-05-28 |
| CKK221 | China Cargo Airlines | 6 | 2026-05-29 |
| CKK228A | - | 4 | 2026-04-13 |
| CKK228 | China Cargo Airlines | 4 | 2026-05-25 |
| CKK216 | China Cargo Airlines | 4 | 2026-05-15 |
| CKK205 | China Cargo Airlines | 4 | 2026-04-15 |
| CKK258 | China Cargo Airlines | 3 | 2026-05-26 |
| CKK226 | China Cargo Airlines | 3 | 2026-05-28 |
| CKK214 | China Cargo Airlines | 3 | 2026-05-12 |
| CKK206 | China Cargo Airlines | 3 | 2026-04-15 |
| CKK213 | China Cargo Airlines | 2 | 2026-05-12 |
| CKK288 | - | 1 | 2026-05-27 |
| CKK264 | China Cargo Airlines | 1 | 2026-04-17 |
| CKK263 | China Cargo Airlines | 1 | 2026-04-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CKK222 | LAX → PVG | May 29, 23:45 UTC | May 30, 05:30 UTC | 5h 45m |
| 2026-05-29 | CKK221 | PVG → LAX | May 29, 10:45 UTC | May 29, 21:00 UTC | 10h 15m |
| 2026-05-28 | CKK226 | LAX → PVG | May 28, 16:50 UTC | May 29, 12:00 UTC | 19h 10m |
| 2026-05-28 | CKK225 | PVG → LAX | May 28, 08:35 UTC | May 28, 14:10 UTC | 5h 35m |
| 2026-05-27 | CKK225 | PVG → LAX | May 27, 13:00 UTC | May 28, 07:15 UTC | 18h 15m |
| 2026-05-27 | CKK288 | - | May 27, 07:30 UTC | May 27, 07:50 UTC | 20m |
| 2026-05-26 | CKK258 | ICN → PVG | May 26, 20:00 UTC | May 27, 02:29 UTC | 6h 30m |
| 2026-05-25 | CKK228 | ORD → PVG | May 25, 22:34 UTC | May 26, 17:55 UTC | 19h 20m |
| 2026-05-25 | CKK228 | ORD → PVG | May 25, 21:04 UTC | May 26, 17:55 UTC | 20h 50m |
| 2026-05-25 | CKK227 | PVG → ANC | May 25, 12:55 UTC | May 25, 18:05 UTC | 5h 10m |
| 2026-05-25 | CKK227 | PVG → ANC | May 25, 03:50 UTC | May 25, 11:10 UTC | 7h 20m |
| 2026-05-24 | CKK222 | LAX → PVG | May 24, 08:35 UTC | May 25, 03:50 UTC | 19h 15m |
| 2026-05-24 | CKK222 | LAX → PVG | May 24, 07:40 UTC | May 25, 03:50 UTC | 20h 10m |
| 2026-05-23 | CKK222 | LAX → PVG | May 23, 20:55 UTC | May 24, 09:15 UTC | 12h 20m |
| 2026-05-23 | CKK221 | PVG → LAX | May 23, 01:20 UTC | May 23, 18:25 UTC | 17h 5m |
| 2026-05-22 | CKK222 | LAX → PVG | May 22, 11:25 UTC | May 22, 22:45 UTC | 11h 20m |
| 2026-05-22 | CKK222 | LAX → PVG | May 22, 00:45 UTC | May 22, 22:45 UTC | 22h 0m |
| 2026-05-21 | CKK221 | PVG → LAX | May 21, 06:15 UTC | May 21, 21:40 UTC | 15h 25m |
| 2026-05-20 | CKK221 | PVG → LAX | May 20, 18:35 UTC | May 21, 13:05 UTC | 18h 30m |
| 2026-05-20 | CKK226 | LAX → PVG | May 20, 17:35 UTC | May 21, 13:05 UTC | 19h 30m |
| 2026-05-20 | CKK225 | PVG → LAX | May 20, 09:20 UTC | May 20, 14:25 UTC | 5h 5m |
| 2026-05-19 | CKK225 | PVG → LAX | May 19, 18:20 UTC | May 20, 08:00 UTC | 13h 41m |
| 2026-05-19 | CKK261 | PVG → TPE | May 19, 16:05 UTC | May 19, 16:35 UTC | 30m |
| 2026-05-18 | CKK226 | LAX → PVG | May 18, 18:25 UTC | May 19, 07:25 UTC | 12h 59m |
| 2026-05-18 | CKK225 | PVG → LAX | May 18, 09:10 UTC | May 18, 14:45 UTC | 5h 35m |
| 2026-05-18 | CKK225 | PVG → LAX | May 18, 00:15 UTC | May 18, 07:50 UTC | 7h 35m |
| 2026-05-16 | CKK258 | ICN → PVG | May 16, 20:10 UTC | May 16, 20:35 UTC | 25m |
| 2026-05-15 | CKK216 | CDG → PVG | May 15, 23:10 UTC | May 16, 17:45 UTC | 18h 36m |
| 2026-05-15 | CKK216 | CDG → PVG | May 15, 21:00 UTC | May 16, 17:45 UTC | 20h 46m |
| 2026-05-15 | CKK216 | CDG → PVG | May 15, 18:35 UTC | May 16, 17:45 UTC | 23h 11m |
| 2026-05-15 | CKK216 | CDG → PVG | May 15, 17:50 UTC | May 15, 23:40 UTC | 5h 50m |
| 2026-05-15 | CKK215 | PVG → CDG | May 15, 07:20 UTC | May 15, 13:40 UTC | 6h 20m |
| 2026-05-14 | CKK222 | LAX → PVG | May 14, 08:35 UTC | May 15, 07:40 UTC | 23h 5m |
| 2026-05-13 | CKK222 | LAX → PVG | May 13, 21:15 UTC | May 14, 09:10 UTC | 11h 55m |
| 2026-05-13 | CKK221 | PVG → LAX | May 13, 08:20 UTC | May 13, 18:25 UTC | 10h 5m |
| 2026-05-12 | CKK221 | PVG → LAX | May 12, 18:40 UTC | May 13, 18:25 UTC | 23h 45m |
| 2026-05-12 | CKK214 | CDG → PVG | May 12, 14:35 UTC | May 13, 09:45 UTC | 19h 10m |
| 2026-05-12 | CKK214 | CDG → PVG | May 12, 12:35 UTC | May 13, 09:45 UTC | 21h 10m |
| 2026-05-12 | CKK214 | CDG → PVG | May 12, 11:50 UTC | May 13, 09:45 UTC | 21h 55m |
| 2026-05-12 | CKK213 | PVG → SZX | May 12, 04:30 UTC | May 12, 08:30 UTC | 4h 0m |
| 2026-05-11 | CKK213 | PVG → SZX | May 11, 20:40 UTC | May 11, 20:50 UTC | 10m |
| 2026-05-10 | CKK236 | LAX → CKG | May 10, 12:25 UTC | May 10, 14:34 UTC | 2h 10m |
| 2026-05-09 | CKK235 | - | May 9, 14:35 UTC | May 10, 09:20 UTC | 18h 45m |
| 2026-05-09 | CKK235 | - | May 9, 13:05 UTC | May 10, 09:20 UTC | 20h 15m |
| 2026-05-09 | CKK235 | - | May 9, 10:35 UTC | May 10, 09:20 UTC | 22h 45m |
| 2026-05-09 | CKK602 | - | May 9, 08:55 UTC | May 10, 08:30 UTC | 23h 35m |
| 2026-05-09 | CKK601 | - | May 9, 05:40 UTC | May 9, 05:55 UTC | 15m |
| 2026-05-07 | CKK602 | - | May 7, 11:25 UTC | May 7, 17:00 UTC | 5h 35m |
| 2026-05-06 | CKK601 | - | May 6, 13:35 UTC | May 7, 08:00 UTC | 18h 25m |
| 2026-05-06 | CKK601 | - | May 6, 11:10 UTC | May 7, 08:00 UTC | 20h 50m |
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-222H page for operator, model, and routing details .