sensors Mode-S transponder
A51554
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N42675 · PIPER PA-28-140/150/160/180 · operated by 908 FLYING CLUB INC
- Hex
- A51554
- Octal
- 51212524
- Decimal
- 10,818,900
- Country
- US
- Tail
- N42675
- Type
- P28A
- Flights observed
- 46
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 16d ago
Last known position
Country allocation
The ICAO 24-bit address A51554 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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 |
|---|---|---|---|
| N42675 | - | 46 | 2026-06-28 |
Recent flights last 46
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-28 | N42675 | - | Jun 28, 12:05 UTC | Jun 28, 12:25 UTC | 20m |
| 2026-06-22 | N42675 | FPR → FPR | Jun 22, 16:54 UTC | Jun 22, 17:55 UTC | 1h 0m |
| 2026-06-20 | N42675 | - | Jun 20, 14:59 UTC | Jun 20, 15:14 UTC | 15m |
| 2026-06-19 | N42675 | - | Jun 19, 12:49 UTC | Jun 19, 13:39 UTC | 50m |
| 2026-06-17 | N42675 | - | Jun 17, 15:00 UTC | Jun 17, 15:15 UTC | 15m |
| 2026-06-17 | N42675 | - | Jun 17, 13:45 UTC | Jun 17, 14:05 UTC | 20m |
| 2026-06-14 | N42675 | - | Jun 14, 16:00 UTC | Jun 14, 16:15 UTC | 15m |
| 2026-06-14 | N42675 | - | Jun 14, 14:35 UTC | Jun 14, 14:50 UTC | 15m |
| 2026-06-13 | N42675 | - | Jun 13, 14:50 UTC | Jun 13, 17:05 UTC | 2h 15m |
| 2026-06-07 | N42675 | - | Jun 7, 14:40 UTC | Jun 7, 16:05 UTC | 1h 25m |
| 2026-05-30 | N42675 | - | May 30, 15:00 UTC | May 30, 15:15 UTC | 15m |
| 2026-05-30 | N42675 | - | May 30, 13:40 UTC | May 30, 14:00 UTC | 20m |
| 2026-05-25 | N42675 | - | May 25, 14:30 UTC | May 25, 15:50 UTC | 1h 20m |
| 2026-05-25 | N42675 | - | May 25, 12:20 UTC | May 25, 13:25 UTC | 1h 5m |
| 2026-05-24 | N42675 | - | May 24, 15:05 UTC | May 24, 15:15 UTC | 10m |
| 2026-05-24 | N42675 | - | May 24, 13:30 UTC | May 24, 13:45 UTC | 15m |
| 2026-05-16 | N42675 | - | May 16, 16:55 UTC | May 16, 17:15 UTC | 20m |
| 2026-05-16 | N42675 | - | May 16, 16:10 UTC | May 16, 16:20 UTC | 10m |
| 2026-05-10 | N42675 | - | May 10, 15:24 UTC | May 10, 15:35 UTC | 10m |
| 2026-05-10 | N42675 | - | May 10, 13:44 UTC | May 10, 14:00 UTC | 15m |
| 2026-05-07 | N42675 | - | May 7, 18:25 UTC | May 7, 19:15 UTC | 50m |
| 2026-05-02 | N42675 | - | May 2, 14:40 UTC | May 2, 14:50 UTC | 10m |
| 2026-05-02 | N42675 | - | May 2, 13:00 UTC | May 2, 13:20 UTC | 20m |
| 2026-04-30 | N42675 | - | Apr 30, 18:30 UTC | Apr 30, 18:45 UTC | 15m |
| 2026-04-30 | N42675 | - | Apr 30, 17:40 UTC | Apr 30, 17:55 UTC | 15m |
| 2026-04-29 | N42675 | - | Apr 29, 15:35 UTC | Apr 29, 15:50 UTC | 15m |
| 2026-04-29 | N42675 | - | Apr 29, 13:50 UTC | Apr 29, 14:00 UTC | 10m |
| 2026-04-27 | N42675 | - | Apr 27, 18:05 UTC | Apr 27, 19:20 UTC | 1h 15m |
| 2026-04-27 | N42675 | - | Apr 27, 14:50 UTC | Apr 27, 16:00 UTC | 1h 10m |
| 2026-04-25 | N42675 | - | Apr 25, 16:00 UTC | Apr 25, 16:15 UTC | 15m |
| 2026-04-25 | N42675 | - | Apr 25, 14:50 UTC | Apr 25, 15:05 UTC | 15m |
| 2026-04-25 | N42675 | - | Apr 25, 13:35 UTC | Apr 25, 13:55 UTC | 20m |
| 2026-04-24 | N42675 | - | Apr 24, 17:15 UTC | Apr 24, 18:05 UTC | 50m |
| 2026-04-22 | N42675 | - | Apr 22, 20:55 UTC | Apr 22, 22:25 UTC | 1h 30m |
| 2026-04-22 | N42675 | - | Apr 22, 15:40 UTC | Apr 22, 17:05 UTC | 1h 25m |
| 2026-04-19 | N42675 | - | Apr 19, 14:10 UTC | Apr 19, 14:50 UTC | 40m |
| 2026-04-16 | N42675 | - | Apr 16, 20:45 UTC | Apr 16, 21:00 UTC | 15m |
| 2026-04-16 | N42675 | - | Apr 16, 19:15 UTC | Apr 16, 19:35 UTC | 20m |
| 2026-04-16 | N42675 | - | Apr 16, 16:20 UTC | Apr 16, 17:05 UTC | 45m |
| 2026-04-15 | N42675 | - | Apr 15, 13:01 UTC | Apr 15, 13:40 UTC | 40m |
| 2026-04-15 | N42675 | - | Apr 15, 11:55 UTC | Apr 15, 12:55 UTC | 1h 0m |
| 2026-04-13 | N42675 | - | Apr 13, 23:05 UTC | Apr 13, 23:40 UTC | 35m |
| 2026-04-13 | N42675 | - | Apr 13, 18:10 UTC | Apr 13, 19:10 UTC | 1h 0m |
| 2026-04-13 | N42675 | - | Apr 13, 17:25 UTC | Apr 13, 17:35 UTC | 10m |
| 2026-04-13 | N42675 | - | Apr 13, 12:50 UTC | Apr 13, 14:25 UTC | 1h 35m |
| 2026-04-13 | N42675 | - | Apr 13, 11:40 UTC | Apr 13, 11:50 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 N42675 page for operator, model, and routing details .