sensors Mode-S transponder
781ED4
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-223A · BOEING 777-200LR
- Hex
- 781ED4
- Octal
- 36017324
- Decimal
- 7,872,212
- Country
- CN
- Tail
- B-223A
- Type
- B77L
- Flights observed
- 184
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 3h ago
Last known position
Country allocation
The ICAO 24-bit address 781ED4 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 | - | 18 | 2026-07-09 |
| CKK222 | China Cargo Airlines | 12 | 2026-05-25 |
| CKK225 | China Cargo Airlines | 11 | 2026-05-19 |
| CKK621 | - | 9 | 2026-07-12 |
| CKK232 | China Cargo Airlines | 9 | 2026-05-14 |
| CKK231 | China Cargo Airlines | 9 | 2026-05-13 |
| CKK602 | - | 8 | 2026-07-14 |
| CKK601 | - | 7 | 2026-07-13 |
| CKK228 | - | 7 | 2026-07-01 |
| CKK205 | - | 7 | 2026-07-03 |
| CKK221 | China Cargo Airlines | 6 | 2026-05-24 |
| CKK204 | - | 6 | 2026-07-08 |
| CKK203 | - | 6 | 2026-07-08 |
| CKK263 | China Cargo Airlines | 5 | 2026-05-23 |
| CKK223 | - | 5 | 2026-06-29 |
| CKK215 | China Cargo Airlines | 5 | 2026-04-28 |
| CKK206 | China Cargo Airlines | 5 | 2026-07-03 |
| CKK624 | China Cargo Airlines | 4 | 2026-04-20 |
| CKK622 | - | 4 | 2026-07-12 |
| CKK236 | - | 4 | 2026-06-28 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | CKK602 | - | Jul 14, 08:15 UTC | Jul 14, 14:20 UTC | 6h 5m |
| 2026-07-13 | CKK601 | - | Jul 13, 23:15 UTC | Jul 14, 05:20 UTC | 6h 5m |
| 2026-07-12 | CKK622 | - | Jul 12, 16:10 UTC | Jul 12, 19:10 UTC | 3h 0m |
| 2026-07-12 | CKK621 | ANC → YYZ | Jul 12, 07:20 UTC | Jul 12, 12:55 UTC | 5h 35m |
| 2026-07-11 | CKK621 | - | Jul 11, 22:40 UTC | Jul 12, 06:05 UTC | 7h 25m |
| 2026-07-10 | CKK228A | - | Jul 10, 06:05 UTC | Jul 10, 18:50 UTC | 12h 45m |
| 2026-07-09 | CKK227 | ANC → ORD | Jul 9, 21:25 UTC | Jul 10, 03:30 UTC | 6h 5m |
| 2026-07-09 | CKK227 | - | Jul 9, 12:20 UTC | Jul 9, 20:05 UTC | 7h 45m |
| 2026-07-08 | CKK227 | - | Jul 8, 19:05 UTC | Jul 9, 19:00 UTC | 23h 55m |
| 2026-07-08 | CKK227 | - | Jul 8, 18:35 UTC | Jul 9, 14:35 UTC | 20h 0m |
| 2026-07-08 | CKK227 | - | Jul 8, 15:05 UTC | Jul 9, 14:35 UTC | 23h 30m |
| 2026-07-08 | CKK204 | - | Jul 8, 13:05 UTC | Jul 9, 13:00 UTC | 23h 55m |
| 2026-07-08 | CKK204 | - | Jul 8, 12:40 UTC | Jul 8, 19:15 UTC | 6h 35m |
| 2026-07-08 | CKK203 | - | Jul 8, 02:30 UTC | Jul 8, 09:20 UTC | 6h 50m |
| 2026-07-07 | CKK203 | - | Jul 7, 07:05 UTC | Jul 8, 06:05 UTC | 23h 0m |
| 2026-07-07 | CKK626 | - | Jul 7, 06:10 UTC | Jul 8, 05:00 UTC | 22h 50m |
| 2026-07-07 | CKK626 | - | Jul 7, 00:20 UTC | Jul 7, 07:10 UTC | 6h 50m |
| 2026-07-06 | CKK625 | ANC → ORD | Jul 6, 16:00 UTC | Jul 6, 21:40 UTC | 5h 40m |
| 2026-07-05 | CKK625 | - | Jul 5, 19:05 UTC | Jul 6, 14:45 UTC | 19h 40m |
| 2026-07-05 | CKK625 | - | Jul 5, 17:30 UTC | Jul 6, 14:45 UTC | 21h 15m |
| 2026-07-05 | CKK228A | - | Jul 5, 11:30 UTC | Jul 6, 08:55 UTC | 21h 25m |
| 2026-07-05 | CKK228A | - | Jul 5, 06:40 UTC | Jul 5, 19:20 UTC | 12h 40m |
| 2026-07-04 | CKK227 | PVG → ANC | Jul 4, 22:35 UTC | Jul 5, 04:00 UTC | 5h 25m |
| 2026-07-04 | CKK227 | PVG → ANC | Jul 4, 13:40 UTC | Jul 4, 21:10 UTC | 7h 30m |
| 2026-07-03 | CKK227 | PVG → ANC | Jul 3, 19:05 UTC | Jul 4, 15:20 UTC | 20h 15m |
| 2026-07-03 | CKK206 | AMS → PVG | Jul 3, 17:05 UTC | Jul 4, 15:20 UTC | 22h 15m |
| 2026-07-03 | CKK206 | AMS → PVG | Jul 3, 16:55 UTC | Jul 4, 15:00 UTC | 22h 5m |
| 2026-07-03 | CKK205 | - | Jul 3, 04:30 UTC | Jul 3, 14:20 UTC | 9h 50m |
| 2026-07-02 | CKK205 | TPE → AMS | Jul 2, 18:35 UTC | Jul 3, 14:20 UTC | 19h 45m |
| 2026-07-01 | CKK228 | - | Jul 1, 21:05 UTC | Jul 2, 16:25 UTC | 19h 20m |
| 2026-07-01 | CKK228 | - | Jul 1, 20:55 UTC | Jul 2, 16:25 UTC | 19h 30m |
| 2026-07-01 | CKK227 | PVG → ANC | Jul 1, 12:40 UTC | Jul 1, 18:25 UTC | 5h 45m |
| 2026-06-30 | CKK227 | PVG → ANC | Jun 30, 19:30 UTC | Jul 1, 11:25 UTC | 15h 55m |
| 2026-06-30 | CKK224 | LAX → PVG | Jun 30, 09:05 UTC | Jul 1, 05:35 UTC | 20h 30m |
| 2026-06-29 | CKK223 | - | Jun 29, 20:24 UTC | Jun 30, 07:00 UTC | 10h 35m |
| 2026-06-28 | CKK236 | - | Jun 28, 14:39 UTC | Jun 28, 20:45 UTC | 6h 5m |
| 2026-06-28 | CKK235 | - | Jun 28, 02:25 UTC | Jun 28, 05:55 UTC | 3h 30m |
| 2026-06-26 | CKK236 | - | Jun 26, 11:55 UTC | Jun 26, 17:44 UTC | 5h 50m |
| 2026-06-26 | CKK235 | - | Jun 26, 07:00 UTC | Jun 26, 08:45 UTC | 1h 45m |
| 2026-06-24 | CKK622 | - | Jun 24, 19:00 UTC | Jun 25, 01:30 UTC | 6h 30m |
| 2026-06-24 | CKK621 | - | Jun 24, 10:04 UTC | Jun 24, 15:49 UTC | 5h 45m |
| 2026-06-23 | CKK621 | - | Jun 23, 13:24 UTC | Jun 24, 08:35 UTC | 19h 10m |
| 2026-06-23 | CKK602 | - | Jun 23, 11:04 UTC | Jun 24, 08:35 UTC | 21h 30m |
| 2026-06-23 | CKK602 | BUD → ANC | Jun 23, 10:15 UTC | Jun 24, 08:35 UTC | 22h 20m |
| 2026-06-22 | CKK601 | - | Jun 22, 23:14 UTC | Jun 23, 05:15 UTC | 6h 0m |
| 2026-06-21 | CKK622 | YYZ → CKG | Jun 21, 16:34 UTC | Jun 21, 23:05 UTC | 6h 30m |
| 2026-06-21 | CKK621 | ANC → YYZ | Jun 21, 07:55 UTC | Jun 21, 13:20 UTC | 5h 25m |
| 2026-06-20 | CKK621 | - | Jun 20, 14:09 UTC | Jun 21, 06:44 UTC | 16h 35m |
| 2026-06-20 | CKK602 | - | Jun 20, 09:05 UTC | Jun 21, 06:44 UTC | 21h 40m |
| 2026-06-20 | CKK602 | BUD → ANC | Jun 20, 08:34 UTC | Jun 21, 06:44 UTC | 22h 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-223A page for operator, model, and routing details .