sensors Mode-S transponder
781A1F
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-220E · BOEING 777-200LR
- Hex
- 781A1F
- Octal
- 36015037
- Decimal
- 7,871,007
- Country
- CN
- Tail
- B-220E
- Type
- B77L
- Flights observed
- 85
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 7h ago
Last known position
Country allocation
The ICAO 24-bit address 781A1F 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 |
|---|---|---|---|
| CKK231 | China Cargo Airlines | 10 | 2026-05-05 |
| CKK205 | China Cargo Airlines | 9 | 2026-05-27 |
| CKK222 | China Cargo Airlines | 8 | 2026-05-17 |
| CKK221 | China Cargo Airlines | 8 | 2026-05-16 |
| CKK232 | China Cargo Airlines | 7 | 2026-05-05 |
| CKK206 | China Cargo Airlines | 7 | 2026-05-27 |
| CKK225 | China Cargo Airlines | 6 | 2026-04-17 |
| CKK227 | China Cargo Airlines | 3 | 2026-04-28 |
| CKK226 | China Cargo Airlines | 3 | 2026-04-17 |
| CKK224 | China Cargo Airlines | 3 | 2026-04-22 |
| CKK277 | China Cargo Airlines | 2 | 2026-05-28 |
| CKK263 | China Cargo Airlines | 2 | 2026-05-29 |
| CKK216 | China Cargo Airlines | 2 | 2026-04-30 |
| CKK215 | China Cargo Airlines | 2 | 2026-04-30 |
| CKK209 | China Cargo Airlines | 2 | 2026-05-02 |
| CKK278 | - | 1 | 2026-05-29 |
| CKK274 | - | 1 | 2026-04-29 |
| CKK273 | - | 1 | 2026-04-28 |
| CKK264 | China Cargo Airlines | 1 | 2026-05-29 |
| CKK261 | China Cargo Airlines | 1 | 2026-04-22 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CKK264 | HKG → PVG | May 29, 22:55 UTC | May 29, 23:15 UTC | 20m |
| 2026-05-29 | CKK263 | PVG → HKG | May 29, 09:15 UTC | May 29, 19:55 UTC | 10h 40m |
| 2026-05-29 | CKK278 | - | May 29, 04:45 UTC | May 29, 05:40 UTC | 55m |
| 2026-05-28 | CKK277 | PVG → BKK | May 28, 12:25 UTC | May 29, 01:35 UTC | 13h 10m |
| 2026-05-27 | CKK206 | AMS → PVG | May 27, 17:35 UTC | May 28, 09:35 UTC | 16h 0m |
| 2026-05-27 | CKK205 | PVG → AMS | May 27, 07:10 UTC | May 27, 13:40 UTC | 6h 30m |
| 2026-05-18 | CKK206 | AMS → PVG | May 18, 16:15 UTC | May 18, 22:15 UTC | 5h 59m |
| 2026-05-18 | CKK205 | PVG → AMS | May 18, 03:35 UTC | May 18, 13:20 UTC | 9h 45m |
| 2026-05-17 | CKK205 | PVG → AMS | May 17, 09:50 UTC | May 18, 09:45 UTC | 23h 55m |
| 2026-05-17 | CKK222 | LAX → PVG | May 17, 08:25 UTC | May 18, 07:25 UTC | 23h 0m |
| 2026-05-16 | CKK222 | LAX → PVG | May 16, 21:55 UTC | May 17, 10:00 UTC | 12h 5m |
| 2026-05-16 | CKK221 | PVG → LAX | May 16, 01:40 UTC | May 16, 18:40 UTC | 17h 1m |
| 2026-05-15 | CKK241 | PVG → NRT | May 15, 03:50 UTC | May 15, 23:20 UTC | 19h 29m |
| 2026-05-14 | CKK277 | PVG → BKK | May 14, 23:05 UTC | May 15, 01:25 UTC | 2h 20m |
| 2026-05-09 | CKK204 | - | May 9, 15:35 UTC | May 10, 00:55 UTC | 9h 20m |
| 2026-05-08 | CKK203 | - | May 8, 20:35 UTC | May 9, 13:10 UTC | 16h 35m |
| 2026-05-08 | CKK222 | LAX → PVG | May 8, 00:40 UTC | May 8, 17:55 UTC | 17h 15m |
| 2026-05-07 | CKK222 | LAX → PVG | May 7, 21:50 UTC | May 8, 17:55 UTC | 20h 5m |
| 2026-05-07 | CKK222 | LAX → PVG | May 7, 21:40 UTC | May 8, 17:55 UTC | 20h 15m |
| 2026-05-07 | CKK221 | PVG → LAX | May 7, 08:15 UTC | May 7, 18:40 UTC | 10h 25m |
| 2026-05-06 | CKK221 | PVG → LAX | May 6, 12:15 UTC | May 7, 09:40 UTC | 21h 25m |
| 2026-05-05 | CKK232 | JFK → PVG | May 5, 22:45 UTC | May 6, 12:40 UTC | 13h 55m |
| 2026-05-05 | CKK231 | PVG → SEA | May 5, 13:30 UTC | May 5, 19:55 UTC | 6h 25m |
| 2026-05-05 | CKK231 | PVG → SEA | May 5, 05:30 UTC | May 5, 12:20 UTC | 6h 50m |
| 2026-05-03 | CKK210 | AMS → PVG | May 3, 12:00 UTC | May 3, 17:50 UTC | 5h 50m |
| 2026-05-02 | CKK209 | PVG → PVG | May 2, 23:05 UTC | May 3, 09:15 UTC | 10h 9m |
| 2026-05-02 | CKK209 | PVG → PVG | May 2, 07:50 UTC | May 3, 07:45 UTC | 23h 54m |
| 2026-05-02 | CKK222 | LAX → PVG | May 2, 07:35 UTC | May 3, 05:45 UTC | 22h 9m |
| 2026-05-01 | CKK222 | LAX → PVG | May 1, 20:45 UTC | May 2, 09:30 UTC | 12h 45m |
| 2026-05-01 | CKK221 | PVG → LAX | May 1, 00:25 UTC | May 1, 18:30 UTC | 18h 5m |
| 2026-04-30 | CKK221 | PVG → LAX | Apr 30, 23:05 UTC | May 1, 18:30 UTC | 19h 25m |
| 2026-04-30 | CKK221 | PVG → LAX | Apr 30, 19:50 UTC | May 1, 18:30 UTC | 22h 40m |
| 2026-04-30 | CKK216 | CDG → PVG | Apr 30, 17:50 UTC | May 1, 17:45 UTC | 23h 55m |
| 2026-04-30 | CKK216 | CDG → PVG | Apr 30, 17:40 UTC | May 1, 09:35 UTC | 15h 55m |
| 2026-04-30 | CKK215 | PVG → CDG | Apr 30, 04:40 UTC | Apr 30, 14:25 UTC | 9h 45m |
| 2026-04-29 | CKK215 | PVG → CDG | Apr 29, 10:45 UTC | Apr 30, 08:35 UTC | 21h 49m |
| 2026-04-29 | CKK274 | - | Apr 29, 08:40 UTC | Apr 30, 05:00 UTC | 20h 20m |
| 2026-04-28 | CKK273 | - | Apr 28, 19:55 UTC | Apr 29, 05:25 UTC | 9h 30m |
| 2026-04-28 | CKK228A | ORD → PVG | Apr 28, 07:50 UTC | Apr 29, 05:25 UTC | 21h 35m |
| 2026-04-28 | CKK227 | PVG → ANC | Apr 28, 01:10 UTC | Apr 28, 05:20 UTC | 4h 10m |
| 2026-04-27 | CKK227 | PVG → ANC | Apr 27, 13:15 UTC | Apr 27, 22:25 UTC | 9h 10m |
| 2026-04-26 | CKK227 | PVG → ANC | Apr 26, 15:50 UTC | Apr 27, 14:25 UTC | 22h 35m |
| 2026-04-26 | CKK232 | JFK → PVG | Apr 26, 15:15 UTC | Apr 27, 13:40 UTC | 22h 25m |
| 2026-04-26 | CKK232 | JFK → PVG | Apr 26, 02:45 UTC | Apr 26, 16:00 UTC | 13h 15m |
| 2026-04-25 | CKK231 | PVG → SEA | Apr 25, 18:35 UTC | Apr 25, 23:20 UTC | 4h 45m |
| 2026-04-24 | CKK231 | PVG → SEA | Apr 24, 22:35 UTC | Apr 25, 17:05 UTC | 18h 30m |
| 2026-04-24 | CKK231 | PVG → SEA | Apr 24, 20:30 UTC | Apr 25, 17:05 UTC | 20h 35m |
| 2026-04-24 | CKK206 | AMS → PVG | Apr 24, 17:50 UTC | Apr 25, 17:05 UTC | 23h 15m |
| 2026-04-24 | CKK206 | AMS → PVG | Apr 24, 17:30 UTC | Apr 25, 09:15 UTC | 15h 45m |
| 2026-04-24 | CKK205 | PVG → AMS | Apr 24, 04:40 UTC | Apr 24, 14:35 UTC | 9h 55m |
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-220E page for operator, model, and routing details .