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
- 205
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 2h ago
Current 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 |
|---|---|---|---|
| CKK225 | - | 26 | 2026-07-14 |
| CKK227 | China Cargo Airlines | 18 | 2026-06-28 |
| CKK602 | - | 14 | 2026-05-09 |
| CKK235 | - | 12 | 2026-05-09 |
| CKK222 | - | 12 | 2026-06-25 |
| CKK601 | - | 11 | 2026-05-09 |
| CKK228 | - | 10 | 2026-06-29 |
| CKK221 | China Cargo Airlines | 8 | 2026-06-24 |
| CKK226 | - | 7 | 2026-07-06 |
| CKK205 | - | 7 | 2026-06-26 |
| CKK236 | China Cargo Airlines | 6 | 2026-05-10 |
| CKK224 | China Cargo Airlines | 6 | 2026-07-02 |
| CKK223 | - | 6 | 2026-07-01 |
| CKK216 | - | 6 | 2026-06-12 |
| CKK206 | China Cargo Airlines | 6 | 2026-06-27 |
| CKK625 | China Cargo Airlines | 5 | 2026-06-15 |
| CKK626 | China Cargo Airlines | 4 | 2026-06-16 |
| CKK257 | - | 4 | 2026-06-26 |
| CKK228A | - | 4 | 2026-04-13 |
| CKK226A | - | 4 | 2026-07-13 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | CKK225 | - | Jul 14, 08:45 UTC | Jul 14, 10:05 UTC | 1h 20m |
| 2026-07-13 | CKK225 | - | Jul 13, 15:20 UTC | Jul 14, 07:35 UTC | 16h 15m |
| 2026-07-13 | CKK225 | - | Jul 13, 09:00 UTC | Jul 14, 07:35 UTC | 22h 35m |
| 2026-07-13 | CKK226A | - | Jul 13, 04:35 UTC | Jul 14, 01:50 UTC | 21h 15m |
| 2026-07-13 | CKK226A | - | Jul 13, 04:05 UTC | Jul 14, 01:50 UTC | 21h 45m |
| 2026-07-12 | CKK225 | ANC → ORD | Jul 12, 19:30 UTC | Jul 13, 01:01 UTC | 5h 30m |
| 2026-07-11 | CKK225 | - | Jul 11, 22:35 UTC | Jul 12, 18:10 UTC | 19h 35m |
| 2026-07-11 | CKK225 | - | Jul 11, 21:20 UTC | Jul 12, 18:10 UTC | 20h 50m |
| 2026-07-11 | CKK226A | - | Jul 11, 18:35 UTC | Jul 12, 18:10 UTC | 23h 35m |
| 2026-07-11 | CKK226A | - | Jul 11, 16:35 UTC | Jul 12, 16:30 UTC | 23h 55m |
| 2026-07-10 | CKK225 | ANC → ORD | Jul 10, 10:55 UTC | Jul 10, 16:20 UTC | 5h 25m |
| 2026-07-10 | CKK225 | - | Jul 10, 01:55 UTC | Jul 10, 09:30 UTC | 7h 35m |
| 2026-07-09 | CKK225 | - | Jul 9, 05:05 UTC | Jul 10, 04:10 UTC | 23h 5m |
| 2026-07-09 | CKK277 | - | Jul 9, 00:40 UTC | Jul 9, 03:00 UTC | 2h 20m |
| 2026-07-06 | CKK226 | - | Jul 6, 17:30 UTC | Jul 7, 06:30 UTC | 13h 0m |
| 2026-07-06 | CKK225 | PVG → LAX | Jul 6, 09:15 UTC | Jul 6, 14:35 UTC | 5h 20m |
| 2026-07-06 | CKK225 | PVG → LAX | Jul 6, 00:20 UTC | Jul 6, 08:00 UTC | 7h 40m |
| 2026-07-05 | CKK225 | PVG → LAX | Jul 5, 11:15 UTC | Jul 6, 08:00 UTC | 20h 45m |
| 2026-07-05 | CKK286 | - | Jul 5, 10:30 UTC | Jul 5, 10:40 UTC | 10m |
| 2026-07-04 | CKK285 | - | Jul 4, 14:25 UTC | Jul 5, 07:10 UTC | 16h 45m |
| 2026-07-04 | CKK232 | - | Jul 4, 04:55 UTC | Jul 5, 04:30 UTC | 23h 35m |
| 2026-07-04 | CKK232 | - | Jul 4, 01:30 UTC | Jul 4, 14:55 UTC | 13h 25m |
| 2026-07-03 | CKK231 | ANC → JFK | Jul 3, 15:15 UTC | Jul 3, 21:50 UTC | 6h 35m |
| 2026-07-02 | CKK231 | - | Jul 2, 21:00 UTC | Jul 3, 14:00 UTC | 17h 0m |
| 2026-07-02 | CKK224 | LAX → PVG | Jul 2, 10:50 UTC | Jul 3, 08:25 UTC | 21h 35m |
| 2026-07-01 | CKK223 | - | Jul 1, 20:45 UTC | Jul 2, 07:05 UTC | 10h 20m |
| 2026-07-01 | CKK223 | - | Jul 1, 07:05 UTC | Jul 2, 06:30 UTC | 23h 25m |
| 2026-06-30 | CKK226 | - | Jun 30, 19:10 UTC | Jul 1, 07:50 UTC | 12h 40m |
| 2026-06-30 | CKK225 | PVG → LAX | Jun 30, 10:55 UTC | Jun 30, 16:35 UTC | 5h 40m |
| 2026-06-30 | CKK225 | PVG → LAX | Jun 30, 02:20 UTC | Jun 30, 09:50 UTC | 7h 30m |
| 2026-06-29 | CKK225 | PVG → LAX | Jun 29, 11:39 UTC | Jun 30, 09:50 UTC | 22h 11m |
| 2026-06-29 | CKK228 | - | Jun 29, 04:45 UTC | Jun 30, 03:50 UTC | 23h 6m |
| 2026-06-29 | CKK228 | - | Jun 29, 00:00 UTC | Jun 29, 12:24 UTC | 12h 25m |
| 2026-06-28 | CKK227 | PVG → ANC | Jun 28, 15:29 UTC | Jun 28, 21:10 UTC | 5h 40m |
| 2026-06-27 | CKK227 | PVG → ANC | Jun 27, 18:35 UTC | Jun 28, 14:09 UTC | 19h 35m |
| 2026-06-27 | CKK206 | AMS → PVG | Jun 27, 16:35 UTC | Jun 28, 14:09 UTC | 21h 35m |
| 2026-06-26 | CKK205 | - | Jun 26, 20:04 UTC | Jun 27, 14:00 UTC | 17h 55m |
| 2026-06-26 | CKK257 | - | Jun 26, 09:55 UTC | Jun 26, 18:09 UTC | 8h 15m |
| 2026-06-26 | CKK278 | - | Jun 26, 04:50 UTC | Jun 26, 06:25 UTC | 1h 35m |
| 2026-06-25 | CKK222 | - | Jun 25, 07:45 UTC | Jun 26, 01:34 UTC | 17h 50m |
| 2026-06-25 | CKK222 | - | Jun 25, 01:19 UTC | Jun 26, 00:30 UTC | 23h 10m |
| 2026-06-24 | CKK222 | - | Jun 24, 21:04 UTC | Jun 25, 09:50 UTC | 12h 45m |
| 2026-06-24 | CKK221 | PVG → LAX | Jun 24, 01:14 UTC | Jun 24, 18:20 UTC | 17h 5m |
| 2026-06-23 | CKK241 | - | Jun 23, 20:44 UTC | Jun 23, 22:25 UTC | 1h 40m |
| 2026-06-20 | CKK222 | - | Jun 20, 21:44 UTC | Jun 21, 09:44 UTC | 12h 0m |
| 2026-06-20 | CKK221 | PVG → LAX | Jun 20, 01:19 UTC | Jun 20, 18:54 UTC | 17h 35m |
| 2026-06-19 | CKK241 | - | Jun 19, 08:34 UTC | Jun 19, 23:14 UTC | 14h 40m |
| 2026-06-19 | CKK241 | - | Jun 19, 02:35 UTC | Jun 19, 23:14 UTC | 20h 40m |
| 2026-06-18 | CKK228 | - | Jun 18, 20:45 UTC | Jun 19, 09:19 UTC | 12h 34m |
| 2026-06-18 | CKK227 | PVG → ANC | Jun 18, 12:35 UTC | Jun 18, 17:50 UTC | 5h 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-222H page for operator, model, and routing details .