sensors Mode-S transponder
781D53
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-625J · GULFSTREAM 4
- Hex
- 781D53
- Octal
- 36016523
- Decimal
- 7,871,827
- Country
- CN
- Tail
- B-625J
- Type
- GLF4
- Flights observed
- 30
- Distinct callsigns
- 1
- Country
- CN
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 781D53 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| B652J | - | 30 | 2026-06-01 |
Recent flights last 30
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-01 | B652J | - | Jun 1, 08:45 UTC | Jun 1, 09:10 UTC | 25m |
| 2026-05-30 | B652J | - | May 30, 13:55 UTC | May 30, 14:30 UTC | 35m |
| 2026-05-29 | B652J | - | May 29, 09:20 UTC | May 30, 04:10 UTC | 18h 50m |
| 2026-05-29 | B652J | - | May 29, 06:15 UTC | May 29, 06:25 UTC | 10m |
| 2026-05-29 | B652J | - | May 29, 03:55 UTC | May 29, 04:50 UTC | 55m |
| 2026-05-27 | B652J | - | May 27, 10:10 UTC | May 27, 10:25 UTC | 15m |
| 2026-05-25 | B652J | - | May 25, 11:05 UTC | May 25, 15:50 UTC | 4h 45m |
| 2026-05-23 | B652J | - | May 23, 19:00 UTC | May 23, 19:35 UTC | 35m |
| 2026-05-22 | B652J | - | May 22, 22:50 UTC | May 23, 19:35 UTC | 20h 45m |
| 2026-05-22 | B652J | - | May 22, 22:25 UTC | May 23, 19:35 UTC | 21h 10m |
| 2026-05-22 | B652J | - | May 22, 15:05 UTC | May 22, 23:05 UTC | 8h 0m |
| 2026-05-19 | B652J | - | May 19, 07:40 UTC | May 19, 10:45 UTC | 3h 5m |
| 2026-05-14 | B652J | - | May 14, 11:05 UTC | May 14, 14:20 UTC | 3h 15m |
| 2026-05-11 | B652J | - | May 11, 10:40 UTC | May 11, 14:20 UTC | 3h 40m |
| 2026-05-11 | B652J | - | May 11, 07:10 UTC | May 11, 08:35 UTC | 1h 25m |
| 2026-05-05 | B652J | - | May 5, 12:55 UTC | May 5, 17:05 UTC | 4h 10m |
| 2026-04-25 | B652J | - | Apr 25, 01:30 UTC | Apr 25, 01:55 UTC | 25m |
| 2026-04-24 | B652J | - | Apr 24, 17:45 UTC | Apr 24, 23:40 UTC | 5h 55m |
| 2026-04-24 | B652J | - | Apr 24, 15:55 UTC | Apr 24, 16:10 UTC | 15m |
| 2026-04-23 | B652J | - | Apr 23, 11:55 UTC | Apr 23, 13:40 UTC | 1h 45m |
| 2026-04-22 | B652J | - | Apr 22, 13:30 UTC | Apr 22, 15:50 UTC | 2h 20m |
| 2026-04-22 | B652J | - | Apr 22, 04:00 UTC | Apr 22, 04:10 UTC | 10m |
| 2026-04-21 | B652J | - | Apr 21, 04:00 UTC | Apr 21, 04:25 UTC | 25m |
| 2026-04-20 | B652J | - | Apr 20, 16:45 UTC | Apr 20, 19:10 UTC | 2h 25m |
| 2026-04-16 | B652J | - | Apr 16, 17:15 UTC | Apr 16, 17:25 UTC | 10m |
| 2026-04-16 | B652J | - | Apr 16, 16:50 UTC | Apr 16, 17:10 UTC | 20m |
| 2026-04-16 | B652J | - | Apr 16, 11:09 UTC | Apr 16, 11:29 UTC | 20m |
| 2026-04-16 | B652J | - | Apr 16, 09:10 UTC | Apr 16, 11:04 UTC | 1h 55m |
| 2026-04-16 | B652J | - | Apr 16, 08:45 UTC | Apr 16, 09:05 UTC | 20m |
| 2026-04-15 | B652J | - | Apr 15, 13:10 UTC | Apr 15, 14:01 UTC | 50m |
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-625J page for operator, model, and routing details .