sensors Mode-S transponder
4851B1
ICAO 24-bit transponder address · allocated to Netherlands
Currently assigned to PH-BHF · BOEING 787-9 Dreamliner
- Hex
- 4851B1
- Octal
- 22050661
- Decimal
- 4,739,505
- Country
- NL
- Tail
- PH-BHF
- Type
- B789
- Flights observed
- 111
- Distinct callsigns
- 20
- Country
- NL
- Last broadcast
- 1h ago
Current position
Country allocation
The ICAO 24-bit address 4851B1 falls within the block assigned to Netherlands (NL) by ICAO Annex 10, Volume III. Every aircraft registered in Netherlands 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 |
|---|---|---|---|
| KLM810 | KLM Royal Dutch Airlines | 11 | 2026-05-02 |
| KLM809 | KLM Royal Dutch Airlines | 11 | 2026-05-02 |
| KLM895 | KLM Royal Dutch Airlines | 7 | 2026-05-29 |
| KLM751 | KLM Royal Dutch Airlines | 7 | 2026-04-17 |
| KLM896 | KLM Royal Dutch Airlines | 6 | 2026-05-25 |
| KLM856 | KLM Royal Dutch Airlines | 6 | 2026-05-22 |
| KLM855 | KLM Royal Dutch Airlines | 6 | 2026-05-22 |
| KLM808 | KLM Royal Dutch Airlines | 6 | 2026-05-14 |
| KLM807 | KLM Royal Dutch Airlines | 6 | 2026-05-14 |
| KLM755 | KLM Royal Dutch Airlines | 5 | 2026-05-25 |
| KLM897 | - | 4 | 2026-04-17 |
| KLM867 | KLM Royal Dutch Airlines | 3 | 2026-05-06 |
| KLM760 | KLM Royal Dutch Airlines | 3 | 2026-05-11 |
| KLM759 | KLM Royal Dutch Airlines | 3 | 2026-05-11 |
| KLM741 | KLM Royal Dutch Airlines | 3 | 2026-04-27 |
| KLM898 | KLM Royal Dutch Airlines | 2 | 2026-04-18 |
| KLM888 | KLM Royal Dutch Airlines | 2 | 2026-05-27 |
| KLM887 | KLM Royal Dutch Airlines | 2 | 2026-05-27 |
| KLM874 | KLM Royal Dutch Airlines | 2 | 2026-05-10 |
| KLM868 | KLM Royal Dutch Airlines | 2 | 2026-05-07 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | KLM895 | AMS → PVG | May 29, 14:20 UTC | May 30, 13:50 UTC | 23h 30m |
| 2026-05-29 | KLM895 | AMS → PVG | May 29, 13:30 UTC | May 30, 05:30 UTC | 16h 1m |
| 2026-05-28 | KLM749 | CTG → AMS | May 28, 20:50 UTC | May 29, 08:35 UTC | 11h 45m |
| 2026-05-28 | KLM749 | CTG → AMS | May 28, 08:20 UTC | May 28, 18:35 UTC | 10h 15m |
| 2026-05-27 | KLM888 | HKG → AMS | May 27, 22:30 UTC | May 28, 03:10 UTC | 4h 40m |
| 2026-05-27 | KLM888 | HKG → AMS | May 27, 14:30 UTC | May 27, 14:50 UTC | 20m |
| 2026-05-27 | KLM887 | AMS → HKG | May 27, 06:44 UTC | May 27, 07:20 UTC | 36m |
| 2026-05-26 | KLM887 | AMS → HKG | May 26, 20:00 UTC | May 26, 23:54 UTC | 3h 55m |
| 2026-05-25 | KLM896 | PVG → AMS | May 25, 23:19 UTC | May 26, 17:04 UTC | 17h 45m |
| 2026-05-25 | KLM896 | PVG → AMS | May 25, 17:25 UTC | May 26, 16:15 UTC | 22h 49m |
| 2026-05-25 | KLM895 | AMS → PVG | May 25, 14:20 UTC | May 26, 13:50 UTC | 23h 30m |
| 2026-05-25 | KLM895 | AMS → PVG | May 25, 13:30 UTC | May 26, 09:35 UTC | 20h 5m |
| 2026-05-25 | KLM755 | GYE → AMS | May 25, 02:30 UTC | May 25, 10:50 UTC | 8h 20m |
| 2026-05-24 | KLM755 | GYE → AMS | May 24, 10:20 UTC | May 25, 10:15 UTC | 23h 55m |
| 2026-05-24 | KLM755 | GYE → AMS | May 24, 08:45 UTC | May 25, 03:20 UTC | 18h 35m |
| 2026-05-22 | KLM856 | ICN → AMS | May 22, 19:10 UTC | May 23, 03:00 UTC | 7h 49m |
| 2026-05-22 | KLM856 | ICN → AMS | May 22, 13:50 UTC | May 22, 14:05 UTC | 15m |
| 2026-05-22 | KLM855 | AMS → ICN | May 22, 06:50 UTC | May 22, 07:20 UTC | 30m |
| 2026-05-21 | KLM855 | AMS → ICN | May 21, 19:50 UTC | May 22, 00:00 UTC | 4h 10m |
| 2026-05-16 | KLM640 | AMS → JFK | May 16, 20:50 UTC | May 17, 06:30 UTC | 9h 40m |
| 2026-05-16 | KLM639 | JFK → AMS | May 16, 08:01 UTC | May 16, 18:35 UTC | 10h 35m |
| 2026-05-15 | KLM296 | YHZ → AMS | May 15, 22:20 UTC | May 16, 04:55 UTC | 6h 35m |
| 2026-05-15 | KLM225 | - | May 15, 11:40 UTC | May 15, 19:20 UTC | 7h 39m |
| 2026-05-14 | KLM808 | TPE → AMS | May 14, 16:15 UTC | May 15, 05:45 UTC | 13h 30m |
| 2026-05-14 | KLM808 | TPE → AMS | May 14, 12:15 UTC | May 14, 14:05 UTC | 1h 50m |
| 2026-05-14 | KLM807 | AMS → MNL | May 14, 08:30 UTC | May 14, 10:15 UTC | 1h 45m |
| 2026-05-13 | KLM807 | AMS → MNL | May 13, 18:50 UTC | May 14, 06:45 UTC | 11h 55m |
| 2026-05-13 | KLM846 | ICN → AMS | May 13, 02:40 UTC | May 13, 14:20 UTC | 11h 40m |
| 2026-05-12 | KLM845 | AMS → ICN | May 12, 13:30 UTC | May 12, 23:50 UTC | 10h 20m |
| 2026-05-11 | KLM760 | SJO → AMS | May 11, 19:50 UTC | May 12, 11:00 UTC | 15h 10m |
| 2026-05-11 | KLM759 | AMS → SJO | May 11, 12:20 UTC | May 12, 11:00 UTC | 22h 41m |
| 2026-05-11 | KLM759 | AMS → SJO | May 11, 11:40 UTC | May 12, 10:15 UTC | 22h 36m |
| 2026-05-10 | KLM874 | AMS → BOM | May 10, 12:19 UTC | May 11, 06:40 UTC | 18h 20m |
| 2026-05-10 | KLM874 | AMS → BOM | May 10, 10:19 UTC | May 11, 06:40 UTC | 20h 20m |
| 2026-05-09 | KLM640 | AMS → JFK | May 9, 21:09 UTC | May 10, 07:10 UTC | 10h 0m |
| 2026-05-09 | KLM639 | JFK → AMS | May 9, 08:10 UTC | May 9, 18:45 UTC | 10h 35m |
| 2026-05-08 | KLM856 | ICN → AMS | May 8, 18:55 UTC | May 9, 02:50 UTC | 7h 55m |
| 2026-05-08 | KLM855 | AMS → ICN | May 8, 07:04 UTC | May 8, 07:14 UTC | 10m |
| 2026-05-07 | KLM855 | AMS → ICN | May 7, 19:55 UTC | May 8, 06:09 UTC | 10h 14m |
| 2026-05-07 | KLM868 | KIX → AMS | May 7, 03:10 UTC | May 7, 17:00 UTC | 13h 51m |
| 2026-05-06 | KLM867 | AMS → KIX | May 6, 13:05 UTC | May 7, 00:55 UTC | 11h 49m |
| 2026-05-05 | KLM808 | TPE → AMS | May 5, 16:20 UTC | May 6, 06:00 UTC | 13h 40m |
| 2026-05-05 | KLM808 | TPE → AMS | May 5, 12:40 UTC | May 5, 14:20 UTC | 1h 40m |
| 2026-05-05 | KLM807 | AMS → MNL | May 5, 08:10 UTC | May 5, 10:05 UTC | 1h 55m |
| 2026-05-04 | KLM807 | AMS → MNL | May 4, 18:20 UTC | May 5, 06:25 UTC | 12h 6m |
| 2026-05-04 | KLM755 | GYE → AMS | May 4, 02:54 UTC | May 4, 10:50 UTC | 7h 55m |
| 2026-05-03 | KLM755 | GYE → AMS | May 3, 08:35 UTC | May 4, 02:54 UTC | 18h 20m |
| 2026-05-02 | KLM810 | KUL → AMS | May 2, 19:00 UTC | May 3, 04:40 UTC | 9h 39m |
| 2026-05-02 | KLM810 | KUL → AMS | May 2, 16:30 UTC | May 2, 16:40 UTC | 10m |
| 2026-05-02 | KLM810 | KUL → AMS | May 2, 13:35 UTC | May 2, 14:10 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 PH-BHF page for operator, model, and routing details .