sensors Mode-S transponder
781D3C
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-221H · BOEING 767-300
- Hex
- 781D3C
- Octal
- 36016474
- Decimal
- 7,871,804
- Country
- CN
- Tail
- B-221H
- Type
- B763
- Flights observed
- 106
- Distinct callsigns
- 12
- Country
- CN
- Last broadcast
- 2d ago
Last known position
Country allocation
The ICAO 24-bit address 781D3C 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 12 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| HYT9007 | - | 29 | 2026-07-15 |
| HYT9008 | - | 23 | 2026-07-15 |
| HYT9059 | - | 16 | 2026-05-21 |
| HYT9060 | - | 12 | 2026-05-21 |
| HYT9083 | - | 6 | 2026-04-30 |
| HYT9026 | - | 6 | 2026-07-12 |
| HYT9025 | - | 5 | 2026-07-07 |
| HYT9087 | - | 4 | 2026-04-28 |
| HYT9058 | - | 2 | 2026-04-18 |
| HYT9088 | - | 1 | 2026-04-26 |
| HYT9084 | - | 1 | 2026-04-17 |
| HYT9057 | - | 1 | 2026-04-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-15 | HYT9008 | - | Jul 15, 12:30 UTC | Jul 15, 13:20 UTC | 50m |
| 2026-07-15 | HYT9007 | - | Jul 15, 09:25 UTC | Jul 15, 10:40 UTC | 1h 15m |
| 2026-07-13 | HYT9008 | - | Jul 13, 23:50 UTC | Jul 14, 01:00 UTC | 1h 10m |
| 2026-07-13 | HYT9007 | - | Jul 13, 20:50 UTC | Jul 13, 21:55 UTC | 1h 5m |
| 2026-07-13 | HYT9007 | - | Jul 13, 01:05 UTC | Jul 13, 21:55 UTC | 20h 50m |
| 2026-07-13 | HYT9008 | - | Jul 13, 00:01 UTC | Jul 13, 21:55 UTC | 21h 55m |
| 2026-07-12 | HYT9026 | - | Jul 12, 04:10 UTC | Jul 12, 22:25 UTC | 18h 15m |
| 2026-07-08 | HYT9008 | - | Jul 8, 13:05 UTC | Jul 9, 06:15 UTC | 17h 10m |
| 2026-07-07 | HYT9007 | - | Jul 7, 17:05 UTC | Jul 8, 11:20 UTC | 18h 15m |
| 2026-07-07 | HYT9026 | BUD → DAC | Jul 7, 15:30 UTC | Jul 8, 11:20 UTC | 19h 50m |
| 2026-07-07 | HYT9025 | - | Jul 7, 04:20 UTC | Jul 7, 12:30 UTC | 8h 10m |
| 2026-07-06 | HYT9008 | - | Jul 6, 13:40 UTC | Jul 7, 12:30 UTC | 22h 50m |
| 2026-07-06 | HYT9007 | - | Jul 6, 11:00 UTC | Jul 6, 11:55 UTC | 55m |
| 2026-07-05 | HYT9008 | - | Jul 5, 11:25 UTC | Jul 6, 11:00 UTC | 23h 35m |
| 2026-07-05 | HYT9007 | - | Jul 5, 08:40 UTC | Jul 5, 10:00 UTC | 1h 20m |
| 2026-07-01 | HYT9008 | - | Jul 1, 08:00 UTC | Jul 1, 09:10 UTC | 1h 10m |
| 2026-07-01 | HYT9007 | - | Jul 1, 04:55 UTC | Jul 1, 06:10 UTC | 1h 15m |
| 2026-06-29 | HYT9008 | - | Jun 29, 16:39 UTC | Jun 29, 17:55 UTC | 1h 15m |
| 2026-06-29 | HYT9007 | - | Jun 29, 13:39 UTC | Jun 29, 14:54 UTC | 1h 15m |
| 2026-06-28 | HYT9008 | - | Jun 28, 09:10 UTC | Jun 28, 10:24 UTC | 1h 15m |
| 2026-06-28 | HYT9007 | - | Jun 28, 06:30 UTC | Jun 28, 07:34 UTC | 1h 5m |
| 2026-06-27 | HYT9007 | - | Jun 27, 11:20 UTC | Jun 28, 07:34 UTC | 20h 15m |
| 2026-06-27 | HYT9026 | - | Jun 27, 09:04 UTC | Jun 28, 07:34 UTC | 22h 30m |
| 2026-06-27 | HYT9026 | - | Jun 27, 08:55 UTC | Jun 28, 06:59 UTC | 22h 5m |
| 2026-06-26 | HYT9025 | - | Jun 26, 22:34 UTC | Jun 27, 06:25 UTC | 7h 50m |
| 2026-06-26 | HYT9025 | - | Jun 26, 09:05 UTC | Jun 27, 06:25 UTC | 21h 20m |
| 2026-06-26 | HYT9008 | - | Jun 26, 08:34 UTC | Jun 26, 22:55 UTC | 14h 20m |
| 2026-06-26 | HYT9007 | - | Jun 26, 05:50 UTC | Jun 26, 06:45 UTC | 55m |
| 2026-06-23 | HYT9026 | - | Jun 23, 20:49 UTC | Jun 24, 02:45 UTC | 5h 55m |
| 2026-06-23 | HYT9025 | - | Jun 23, 10:19 UTC | Jun 23, 18:34 UTC | 8h 15m |
| 2026-06-22 | HYT9008 | - | Jun 22, 08:04 UTC | Jun 22, 08:29 UTC | 25m |
| 2026-06-22 | HYT9007 | - | Jun 22, 06:05 UTC | Jun 22, 06:45 UTC | 40m |
| 2026-06-20 | HYT9026 | - | Jun 20, 09:49 UTC | Jun 20, 12:50 UTC | 3h 0m |
| 2026-06-20 | HYT9025 | - | Jun 20, 06:24 UTC | Jun 20, 06:54 UTC | 30m |
| 2026-06-19 | HYT9008 | - | Jun 19, 09:40 UTC | Jun 19, 23:04 UTC | 13h 25m |
| 2026-06-19 | HYT9007 | - | Jun 19, 06:59 UTC | Jun 19, 07:54 UTC | 55m |
| 2026-06-17 | HYT9008 | - | Jun 17, 08:40 UTC | Jun 17, 09:25 UTC | 45m |
| 2026-06-17 | HYT9007 | - | Jun 17, 06:00 UTC | Jun 17, 06:55 UTC | 55m |
| 2026-06-15 | HYT9008 | - | Jun 15, 08:54 UTC | Jun 15, 09:40 UTC | 45m |
| 2026-06-15 | HYT9007 | - | Jun 15, 06:49 UTC | Jun 15, 07:40 UTC | 50m |
| 2026-06-14 | HYT9007 | - | Jun 14, 09:10 UTC | Jun 15, 07:40 UTC | 22h 30m |
| 2026-06-14 | HYT9008 | - | Jun 14, 08:35 UTC | Jun 15, 07:00 UTC | 22h 25m |
| 2026-06-14 | HYT9007 | - | Jun 14, 06:00 UTC | Jun 14, 07:00 UTC | 1h 0m |
| 2026-06-10 | HYT9008 | - | Jun 10, 09:00 UTC | Jun 10, 09:35 UTC | 35m |
| 2026-06-10 | HYT9007 | - | Jun 10, 06:10 UTC | Jun 10, 07:05 UTC | 55m |
| 2026-06-08 | HYT9008 | - | Jun 8, 08:55 UTC | Jun 8, 09:20 UTC | 25m |
| 2026-06-08 | HYT9007 | - | Jun 8, 06:10 UTC | Jun 8, 07:10 UTC | 1h 0m |
| 2026-06-07 | HYT9008 | - | Jun 7, 08:45 UTC | Jun 8, 07:00 UTC | 22h 15m |
| 2026-06-07 | HYT9007 | - | Jun 7, 06:40 UTC | Jun 7, 07:15 UTC | 35m |
| 2026-06-05 | HYT9008 | - | Jun 5, 09:30 UTC | Jun 5, 10:05 UTC | 35m |
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-221H page for operator, model, and routing details .