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
- 107
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 4d 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 |
|---|---|---|---|
| CKK222 | China Cargo Airlines | 12 | 2026-05-25 |
| CKK225 | China Cargo Airlines | 11 | 2026-05-19 |
| CKK232 | China Cargo Airlines | 9 | 2026-05-14 |
| CKK231 | China Cargo Airlines | 9 | 2026-05-13 |
| CKK227 | China Cargo Airlines | 8 | 2026-05-22 |
| CKK221 | China Cargo Airlines | 6 | 2026-05-24 |
| CKK263 | China Cargo Airlines | 5 | 2026-05-23 |
| CKK228 | China Cargo Airlines | 5 | 2026-05-22 |
| CKK215 | China Cargo Airlines | 5 | 2026-04-28 |
| CKK624 | China Cargo Airlines | 4 | 2026-04-20 |
| CKK226 | China Cargo Airlines | 4 | 2026-05-19 |
| CKK223 | China Cargo Airlines | 4 | 2026-05-09 |
| CKK623 | China Cargo Airlines | 3 | 2026-04-19 |
| CKK264 | China Cargo Airlines | 3 | 2026-05-25 |
| CKK216 | China Cargo Airlines | 3 | 2026-04-28 |
| CKK204 | - | 3 | 2026-05-21 |
| CKK203 | - | 3 | 2026-05-20 |
| CKK277 | China Cargo Airlines | 2 | 2026-04-17 |
| CKK257 | China Cargo Airlines | 2 | 2026-05-12 |
| CKK224 | China Cargo Airlines | 2 | 2026-05-10 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-25 | CKK264 | HKG → PVG | May 25, 23:24 UTC | May 25, 23:40 UTC | 15m |
| 2026-05-25 | CKK222 | LAX → PVG | May 25, 02:35 UTC | May 25, 20:24 UTC | 17h 49m |
| 2026-05-24 | CKK222 | LAX → PVG | May 24, 23:35 UTC | May 24, 23:46 UTC | 11m |
| 2026-05-24 | CKK221 | PVG → LAX | May 24, 10:55 UTC | May 24, 21:20 UTC | 10h 25m |
| 2026-05-23 | CKK221 | PVG → LAX | May 23, 23:05 UTC | May 24, 21:20 UTC | 22h 15m |
| 2026-05-23 | CKK263 | PVG → HKG | May 23, 04:10 UTC | May 23, 20:40 UTC | 16h 31m |
| 2026-05-22 | CKK263 | PVG → HKG | May 22, 23:05 UTC | May 23, 20:40 UTC | 21h 35m |
| 2026-05-22 | CKK228 | ORD → PVG | May 22, 22:25 UTC | May 23, 20:40 UTC | 22h 15m |
| 2026-05-22 | CKK227 | PVG → ANC | May 22, 13:50 UTC | May 22, 19:25 UTC | 5h 35m |
| 2026-05-21 | CKK227 | PVG → ANC | May 21, 18:30 UTC | May 22, 12:25 UTC | 17h 55m |
| 2026-05-21 | CKK227 | PVG → ANC | May 21, 15:10 UTC | May 22, 12:25 UTC | 21h 15m |
| 2026-05-21 | CKK204 | - | May 21, 13:05 UTC | May 22, 12:25 UTC | 23h 20m |
| 2026-05-21 | CKK204 | - | May 21, 12:50 UTC | May 22, 06:50 UTC | 18h 0m |
| 2026-05-20 | CKK203 | - | May 20, 23:35 UTC | May 21, 09:35 UTC | 10h 0m |
| 2026-05-20 | CKK203 | - | May 20, 05:40 UTC | May 21, 03:15 UTC | 21h 35m |
| 2026-05-19 | CKK226 | LAX → PVG | May 19, 17:10 UTC | May 20, 05:50 UTC | 12h 41m |
| 2026-05-19 | CKK225 | PVG → LAX | May 19, 09:10 UTC | May 19, 14:35 UTC | 5h 25m |
| 2026-05-19 | CKK225 | PVG → LAX | May 19, 00:35 UTC | May 19, 07:40 UTC | 7h 5m |
| 2026-05-18 | CKK225 | PVG → LAX | May 18, 09:05 UTC | May 19, 07:40 UTC | 22h 34m |
| 2026-05-18 | CKK225 | PVG → LAX | May 18, 08:20 UTC | May 19, 07:00 UTC | 22h 39m |
| 2026-05-18 | CKK228 | ORD → PVG | May 18, 03:25 UTC | May 19, 02:05 UTC | 22h 39m |
| 2026-05-18 | CKK228 | ORD → PVG | May 18, 01:35 UTC | May 19, 01:00 UTC | 23h 24m |
| 2026-05-17 | CKK228 | ORD → PVG | May 17, 20:45 UTC | May 18, 09:40 UTC | 12h 55m |
| 2026-05-17 | CKK227 | PVG → ANC | May 17, 12:30 UTC | May 17, 18:01 UTC | 5h 30m |
| 2026-05-16 | CKK227 | PVG → ANC | May 16, 18:40 UTC | May 17, 11:05 UTC | 16h 25m |
| 2026-05-15 | CKK261 | PVG → TPE | May 15, 23:45 UTC | May 16, 16:31 UTC | 16h 46m |
| 2026-05-15 | CKK226 | LAX → PVG | May 15, 17:50 UTC | May 16, 06:31 UTC | 12h 41m |
| 2026-05-15 | CKK225 | PVG → LAX | May 15, 09:00 UTC | May 15, 14:35 UTC | 5h 35m |
| 2026-05-14 | CKK225 | PVG → LAX | May 14, 13:05 UTC | May 15, 07:45 UTC | 18h 40m |
| 2026-05-14 | CKK232 | JFK → PVG | May 14, 12:40 UTC | May 15, 07:45 UTC | 19h 5m |
| 2026-05-14 | CKK232 | JFK → PVG | May 14, 07:05 UTC | May 15, 06:45 UTC | 23h 40m |
| 2026-05-14 | CKK232 | JFK → PVG | May 14, 05:10 UTC | May 15, 00:25 UTC | 19h 15m |
| 2026-05-14 | CKK232 | JFK → PVG | May 14, 03:05 UTC | May 15, 00:25 UTC | 21h 20m |
| 2026-05-14 | CKK232 | JFK → PVG | May 14, 01:05 UTC | May 15, 00:25 UTC | 23h 20m |
| 2026-05-14 | CKK232 | JFK → PVG | May 14, 00:05 UTC | May 14, 14:01 UTC | 13h 55m |
| 2026-05-13 | CKK231 | PVG → SEA | May 13, 14:45 UTC | May 13, 21:10 UTC | 6h 25m |
| 2026-05-12 | CKK231 | PVG → SEA | May 12, 19:55 UTC | May 13, 13:00 UTC | 17h 5m |
| 2026-05-12 | CKK257 | PVG → ICN | May 12, 17:10 UTC | May 12, 17:45 UTC | 35m |
| 2026-05-10 | CKK224 | LAX → PVG | May 10, 09:40 UTC | May 10, 21:35 UTC | 11h 55m |
| 2026-05-09 | CKK223 | PVG → LAX | May 9, 12:40 UTC | May 10, 06:40 UTC | 18h 0m |
| 2026-05-09 | CKK223 | PVG → LAX | May 9, 02:10 UTC | May 9, 22:10 UTC | 20h 0m |
| 2026-05-08 | CKK232A | JFK → PVG | May 8, 23:05 UTC | May 9, 22:10 UTC | 23h 5m |
| 2026-05-08 | CKK231 | PVG → SEA | May 8, 13:25 UTC | May 8, 19:25 UTC | 6h 0m |
| 2026-05-08 | CKK231 | PVG → SEA | May 8, 05:00 UTC | May 8, 12:00 UTC | 7h 0m |
| 2026-05-07 | CKK231 | PVG → SEA | May 7, 09:05 UTC | May 8, 06:20 UTC | 21h 15m |
| 2026-05-06 | CKK228 | ORD → PVG | May 6, 20:50 UTC | May 7, 09:35 UTC | 12h 45m |
| 2026-05-06 | CKK227 | PVG → ANC | May 6, 12:40 UTC | May 6, 18:10 UTC | 5h 29m |
| 2026-05-06 | CKK227 | PVG → ANC | May 6, 04:10 UTC | May 6, 11:15 UTC | 7h 5m |
| 2026-05-05 | CKK227 | PVG → ANC | May 5, 05:35 UTC | May 6, 05:00 UTC | 23h 25m |
| 2026-05-04 | CKK226 | LAX → PVG | May 4, 17:10 UTC | May 5, 06:05 UTC | 12h 56m |
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 .