sensors Mode-S transponder
781C0B
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-651H · BOMBARDIER BD-700 Global 6000/6500
- Hex
- 781C0B
- Octal
- 36016013
- Decimal
- 7,871,499
- Country
- CN
- Tail
- B-651H
- Type
- GLEX
- Flights observed
- 31
- Distinct callsigns
- 13
- Country
- CN
- Last broadcast
- Jul 26, 10:20 UTC
Last known position
Country allocation
The ICAO 24-bit address 781C0B 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 13 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| B651H | - | 18 | 2026-07-26 |
| HZY5402 | - | 2 | 2026-04-25 |
| HZY5431 | - | 1 | 2026-06-11 |
| HZY5420 | - | 1 | 2026-05-24 |
| HZY5419 | - | 1 | 2026-05-21 |
| HZY5417 | - | 1 | 2026-05-16 |
| HZY5416 | - | 1 | 2026-05-18 |
| HZY5415 | - | 1 | 2026-05-18 |
| HZY5408 | - | 1 | 2026-04-19 |
| HZY5406 | - | 1 | 2026-04-17 |
| HZY5401 | - | 1 | 2026-04-23 |
| HZY5398 | - | 1 | 2026-04-20 |
| HZY5397 | - | 1 | 2026-04-13 |
Recent flights last 31
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | B651H | - | Jul 26, 04:40 UTC | Jul 26, 10:20 UTC | 5h 41m |
| 2026-07-25 | B651H | - | Jul 25, 04:05 UTC | Jul 25, 04:25 UTC | 20m |
| 2026-07-24 | B651H | - | Jul 24, 19:35 UTC | Jul 25, 01:35 UTC | 6h 0m |
| 2026-07-20 | B651H | - | Jul 20, 15:45 UTC | Jul 20, 16:55 UTC | 1h 10m |
| 2026-07-20 | B651H | VIE → MUC | Jul 20, 12:20 UTC | Jul 20, 13:00 UTC | 40m |
| 2026-07-07 | B651H | - | Jul 7, 08:35 UTC | Jul 7, 14:50 UTC | 6h 15m |
| 2026-07-02 | B651H | - | Jul 2, 04:55 UTC | Jul 2, 05:25 UTC | 30m |
| 2026-06-30 | B651H | - | Jun 30, 02:55 UTC | Jun 30, 03:15 UTC | 20m |
| 2026-06-27 | B651H | - | Jun 27, 09:34 UTC | Jun 27, 11:44 UTC | 2h 10m |
| 2026-06-26 | B651H | - | Jun 26, 09:59 UTC | Jun 26, 10:10 UTC | 10m |
| 2026-06-22 | B651H | - | Jun 22, 03:45 UTC | Jun 22, 04:09 UTC | 25m |
| 2026-06-21 | B651H | - | Jun 21, 06:29 UTC | Jun 21, 06:44 UTC | 15m |
| 2026-06-11 | HZY5431 | - | Jun 11, 08:00 UTC | Jun 11, 08:10 UTC | 10m |
| 2026-05-29 | B651H | - | May 29, 23:30 UTC | May 30, 01:40 UTC | 2h 10m |
| 2026-05-29 | B651H | HND → CTS | May 29, 21:30 UTC | May 29, 22:40 UTC | 1h 10m |
| 2026-05-27 | B651H | - | May 27, 07:50 UTC | May 27, 09:15 UTC | 1h 25m |
| 2026-05-27 | B651H | - | May 27, 02:54 UTC | May 27, 06:15 UTC | 3h 20m |
| 2026-05-24 | HZY5420 | - | May 24, 03:15 UTC | May 24, 03:25 UTC | 10m |
| 2026-05-21 | HZY5419 | - | May 21, 07:05 UTC | May 21, 07:15 UTC | 10m |
| 2026-05-18 | HZY5416 | - | May 18, 15:00 UTC | May 18, 15:15 UTC | 15m |
| 2026-05-18 | HZY5415 | - | May 18, 05:30 UTC | May 18, 05:45 UTC | 15m |
| 2026-05-16 | HZY5417 | - | May 16, 14:05 UTC | May 16, 14:20 UTC | 15m |
| 2026-05-11 | B651H | - | May 11, 00:45 UTC | May 11, 01:25 UTC | 40m |
| 2026-05-08 | B651H | - | May 8, 08:24 UTC | May 8, 10:25 UTC | 2h 0m |
| 2026-04-25 | HZY5402 | - | Apr 25, 12:00 UTC | Apr 25, 12:10 UTC | 10m |
| 2026-04-23 | HZY5401 | - | Apr 23, 04:15 UTC | Apr 23, 04:30 UTC | 15m |
| 2026-04-20 | HZY5398 | - | Apr 20, 04:55 UTC | Apr 20, 05:05 UTC | 10m |
| 2026-04-19 | HZY5408 | - | Apr 19, 08:20 UTC | Apr 19, 08:40 UTC | 20m |
| 2026-04-17 | HZY5406 | - | Apr 17, 07:20 UTC | Apr 17, 07:35 UTC | 15m |
| 2026-04-14 | HZY5402 | - | Apr 14, 14:00 UTC | Apr 14, 14:10 UTC | 10m |
| 2026-04-13 | HZY5397 | - | Apr 13, 14:20 UTC | Apr 13, 14:30 UTC | 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-651H page for operator, model, and routing details .