sensors Mode-S transponder
484D18
ICAO 24-bit transponder address · allocated to Netherlands
Currently assigned to PH-CRT · Lindstrand LBL 120A
- Hex
- 484D18
- Octal
- 22046430
- Decimal
- 4,738,328
- Country
- NL
- Tail
- PH-CRT
- Type
- BALL
- Flights observed
- 5
- Distinct callsigns
- 4
- Country
- NL
- Last broadcast
- Jul 26, 15:50 UTC
Last known position
Country allocation
The ICAO 24-bit address 484D18 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 4 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| KLM1633 | KLM Royal Dutch Airlines | 2 | 2026-07-25 |
| KLM51E | - | 1 | 2026-07-07 |
| KLM50N | KLM Royal Dutch Airlines | 1 | 2026-07-25 |
| KLM43F | KLM Royal Dutch Airlines | 1 | 2026-07-25 |
Recent flights last 5
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | KLM43F | AMS → NCE | Jul 25, 19:45 UTC | Jul 26, 15:50 UTC | 20h 6m |
| 2026-07-25 | KLM50N | VCE → AMS | Jul 25, 16:40 UTC | Jul 26, 15:50 UTC | 23h 11m |
| 2026-07-25 | KLM1633 | AMS → VCE | Jul 25, 14:05 UTC | Jul 25, 19:50 UTC | 5h 45m |
| 2026-07-07 | KLM51E | - | Jul 7, 11:40 UTC | Jul 8, 09:30 UTC | 21h 50m |
| 2026-06-22 | KLM1633 | AMS → VCE | Jun 22, 13:39 UTC | Jun 22, 16:14 UTC | 2h 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-CRT page for operator, model, and routing details .