sensors Mode-S transponder
781940
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-20EM · BOEING 777-200LR
- Hex
- 781940
- Octal
- 36014500
- Decimal
- 7,870,784
- Country
- CN
- Tail
- B-20EM
- Type
- B77L
- Flights observed
- 222
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 46m ago
Current position
Country allocation
The ICAO 24-bit address 781940 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 |
|---|---|---|---|
| CSN427 | - | 23 | 2026-07-06 |
| CSN437 | - | 21 | 2026-07-17 |
| CSN485 | - | 19 | 2026-07-09 |
| CSN451 | China Southern Airlines | 15 | 2026-07-07 |
| CSN438 | - | 11 | 2026-07-18 |
| CSN428 | - | 11 | 2026-07-07 |
| CSN487 | - | 10 | 2026-07-12 |
| CSN435 | China Southern Airlines | 10 | 2026-06-09 |
| CSN495 | - | 9 | 2026-06-28 |
| CSN5213 | China Southern Airlines | 7 | 2026-05-11 |
| CSN463 | China Southern Airlines | 7 | 2026-06-04 |
| CSN453 | - | 7 | 2026-07-10 |
| CSN496 | - | 5 | 2026-06-29 |
| CSN467 | - | 5 | 2026-06-17 |
| CSN462 | China Southern Airlines | 5 | 2026-06-17 |
| CSN452 | - | 5 | 2026-07-08 |
| CSN5229 | China Southern Airlines | 4 | 2026-06-20 |
| CSN5227 | - | 4 | 2026-07-14 |
| CSN5220 | China Southern Airlines | 4 | 2026-05-12 |
| CSN5214 | China Southern Airlines | 4 | 2026-05-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-18 | CSN438 | - | Jul 18, 01:45 UTC | Jul 18, 02:00 UTC | 15m |
| 2026-07-17 | CSN437 | ANC → ORD | Jul 17, 16:44 UTC | Jul 17, 22:20 UTC | 5h 35m |
| 2026-07-16 | CSN437 | - | Jul 16, 23:25 UTC | Jul 17, 15:25 UTC | 16h 0m |
| 2026-07-16 | CSN437 | - | Jul 16, 17:20 UTC | Jul 17, 15:25 UTC | 22h 5m |
| 2026-07-16 | CSN438 | - | Jul 16, 12:05 UTC | Jul 17, 09:30 UTC | 21h 25m |
| 2026-07-16 | CSN438 | - | Jul 16, 11:20 UTC | Jul 17, 09:30 UTC | 22h 10m |
| 2026-07-16 | CSN437 | - | Jul 16, 03:45 UTC | Jul 16, 08:55 UTC | 5h 10m |
| 2026-07-15 | CSN437 | - | Jul 15, 18:55 UTC | Jul 16, 02:35 UTC | 7h 40m |
| 2026-07-15 | CSN437 | - | Jul 15, 04:05 UTC | Jul 16, 02:35 UTC | 22h 30m |
| 2026-07-15 | CSN437 | - | Jul 15, 03:30 UTC | Jul 16, 02:00 UTC | 22h 30m |
| 2026-07-14 | CSN437 | - | Jul 14, 21:25 UTC | Jul 15, 20:00 UTC | 22h 34m |
| 2026-07-14 | CSN5228 | - | Jul 14, 15:05 UTC | Jul 15, 04:15 UTC | 13h 9m |
| 2026-07-14 | CSN5227 | ANC → ORD | Jul 14, 07:05 UTC | Jul 14, 12:30 UTC | 5h 25m |
| 2026-07-13 | CSN5227 | - | Jul 13, 15:15 UTC | Jul 14, 05:45 UTC | 14h 30m |
| 2026-07-13 | CSN5227 | - | Jul 13, 05:25 UTC | Jul 13, 23:55 UTC | 18h 30m |
| 2026-07-13 | CSN5227 | - | Jul 13, 02:30 UTC | Jul 13, 23:55 UTC | 21h 25m |
| 2026-07-12 | CSN487 | ANC → YYZ | Jul 12, 17:05 UTC | Jul 12, 22:30 UTC | 5h 25m |
| 2026-07-11 | CSN487 | - | Jul 11, 22:01 UTC | Jul 12, 15:55 UTC | 17h 55m |
| 2026-07-11 | CSN487 | - | Jul 11, 18:05 UTC | Jul 12, 15:55 UTC | 21h 50m |
| 2026-07-11 | CSN487 | - | Jul 11, 16:30 UTC | Jul 12, 15:55 UTC | 23h 25m |
| 2026-07-10 | CSN453 | - | Jul 10, 16:40 UTC | Jul 11, 07:00 UTC | 14h 20m |
| 2026-07-10 | CSN453 | - | Jul 10, 07:05 UTC | Jul 11, 06:01 UTC | 22h 56m |
| 2026-07-10 | CSN486 | - | Jul 10, 04:15 UTC | Jul 11, 04:01 UTC | 23h 46m |
| 2026-07-09 | CSN485 | ANC → YYZ | Jul 9, 20:05 UTC | Jul 10, 02:05 UTC | 6h 0m |
| 2026-07-09 | CSN485 | - | Jul 9, 11:10 UTC | Jul 9, 18:40 UTC | 7h 30m |
| 2026-07-08 | CSN485 | - | Jul 8, 15:05 UTC | Jul 9, 12:45 UTC | 21h 40m |
| 2026-07-08 | CSN452 | - | Jul 8, 09:40 UTC | Jul 8, 15:50 UTC | 6h 10m |
| 2026-07-07 | CSN451 | SZX → AMS | Jul 7, 16:15 UTC | Jul 8, 06:50 UTC | 14h 35m |
| 2026-07-07 | CSN451 | SZX → AMS | Jul 7, 09:10 UTC | Jul 8, 06:50 UTC | 21h 40m |
| 2026-07-07 | CSN428 | - | Jul 7, 04:05 UTC | Jul 8, 03:45 UTC | 23h 40m |
| 2026-07-07 | CSN428 | - | Jul 7, 03:20 UTC | Jul 8, 01:00 UTC | 21h 40m |
| 2026-07-06 | CSN427 | ANC → ORD | Jul 6, 19:15 UTC | Jul 7, 00:30 UTC | 5h 15m |
| 2026-07-05 | CSN427 | - | Jul 5, 23:00 UTC | Jul 6, 17:55 UTC | 18h 55m |
| 2026-07-05 | CSN427 | - | Jul 5, 18:05 UTC | Jul 6, 17:55 UTC | 23h 50m |
| 2026-07-05 | CSN452 | - | Jul 5, 17:40 UTC | Jul 6, 12:35 UTC | 18h 55m |
| 2026-07-04 | CSN451 | SZX → AMS | Jul 4, 18:40 UTC | Jul 5, 13:25 UTC | 18h 45m |
| 2026-07-04 | CSN451 | SZX → AMS | Jul 4, 14:05 UTC | Jul 5, 13:25 UTC | 23h 20m |
| 2026-07-04 | CSN438 | - | Jul 4, 12:05 UTC | Jul 5, 10:00 UTC | 21h 55m |
| 2026-07-04 | CSN438 | - | Jul 4, 08:05 UTC | Jul 5, 07:30 UTC | 23h 25m |
| 2026-07-04 | CSN438 | - | Jul 4, 07:25 UTC | Jul 5, 04:15 UTC | 20h 50m |
| 2026-07-03 | CSN437 | ANC → ORD | Jul 3, 22:50 UTC | Jul 4, 04:35 UTC | 5h 45m |
| 2026-07-03 | CSN437 | - | Jul 3, 14:15 UTC | Jul 3, 21:40 UTC | 7h 25m |
| 2026-07-03 | CSN437 | - | Jul 3, 01:50 UTC | Jul 3, 21:40 UTC | 19h 50m |
| 2026-07-02 | CSN428 | - | Jul 2, 14:10 UTC | Jul 3, 02:00 UTC | 11h 50m |
| 2026-07-02 | CSN427 | ANC → ORD | Jul 2, 05:15 UTC | Jul 2, 11:00 UTC | 5h 45m |
| 2026-07-01 | CSN427 | - | Jul 1, 14:15 UTC | Jul 2, 04:00 UTC | 13h 45m |
| 2026-07-01 | CSN427 | - | Jul 1, 04:50 UTC | Jul 2, 04:00 UTC | 23h 10m |
| 2026-07-01 | CSN427 | - | Jul 1, 02:10 UTC | Jul 1, 22:15 UTC | 20h 5m |
| 2026-06-30 | CSN485 | ANC → YYZ | Jun 30, 17:50 UTC | Jun 30, 23:35 UTC | 5h 45m |
| 2026-06-30 | CSN485 | - | Jun 30, 09:20 UTC | Jun 30, 16:35 UTC | 7h 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-20EM page for operator, model, and routing details .