sensors Mode-S transponder
A276D4
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N258SP · SOCATA TBM-700A/B/C · operated by ASTRO AVIATION LLC
- Hex
- A276D4
- Octal
- 50473324
- Decimal
- 10,647,252
- Country
- US
- Tail
- N258SP
- Type
- TBM7
- Flights observed
- 34
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 22, 18:45 UTC
Last known position
Country allocation
The ICAO 24-bit address A276D4 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 |
|---|---|---|---|
| N258SP | - | 34 | 2026-07-22 |
Recent flights last 34
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-22 | N258SP | - | Jul 22, 18:00 UTC | Jul 22, 18:45 UTC | 45m |
| 2026-07-12 | N258SP | - | Jul 12, 19:30 UTC | Jul 12, 20:10 UTC | 40m |
| 2026-07-03 | N258SP | - | Jul 3, 21:15 UTC | Jul 3, 21:55 UTC | 40m |
| 2026-07-03 | N258SP | - | Jul 3, 14:35 UTC | Jul 3, 16:15 UTC | 1h 40m |
| 2026-07-03 | N258SP | - | Jul 3, 10:30 UTC | Jul 3, 13:40 UTC | 3h 10m |
| 2026-06-30 | N258SP | - | Jun 30, 18:40 UTC | Jun 30, 19:20 UTC | 40m |
| 2026-06-30 | N258SP | - | Jun 30, 17:25 UTC | Jun 30, 18:00 UTC | 35m |
| 2026-06-29 | N258SP | - | Jun 29, 20:04 UTC | Jun 29, 21:34 UTC | 1h 30m |
| 2026-06-21 | N258SP | - | Jun 21, 18:44 UTC | Jun 21, 19:34 UTC | 50m |
| 2026-06-19 | N258SP | - | Jun 19, 14:29 UTC | Jun 19, 15:29 UTC | 1h 0m |
| 2026-06-18 | N258SP | - | Jun 18, 15:25 UTC | Jun 18, 17:55 UTC | 2h 30m |
| 2026-06-18 | N258SP | - | Jun 18, 13:00 UTC | Jun 18, 14:30 UTC | 1h 30m |
| 2026-06-15 | N258SP | - | Jun 15, 15:00 UTC | Jun 15, 17:10 UTC | 2h 10m |
| 2026-06-14 | N258SP | - | Jun 14, 17:20 UTC | Jun 14, 19:05 UTC | 1h 45m |
| 2026-05-29 | N258SP | - | May 29, 15:55 UTC | May 29, 16:30 UTC | 35m |
| 2026-05-26 | N258SP | - | May 26, 14:00 UTC | May 26, 14:35 UTC | 35m |
| 2026-05-25 | N258SP | - | May 25, 15:35 UTC | May 25, 17:35 UTC | 2h 0m |
| 2026-05-22 | N258SP | - | May 22, 13:15 UTC | May 22, 15:20 UTC | 2h 5m |
| 2026-05-20 | N258SP | - | May 20, 19:25 UTC | May 20, 20:05 UTC | 40m |
| 2026-04-28 | N258SP | - | Apr 28, 12:20 UTC | Apr 28, 12:55 UTC | 35m |
| 2026-04-27 | N258SP | - | Apr 27, 19:00 UTC | Apr 27, 20:05 UTC | 1h 5m |
| 2026-04-24 | N258SP | - | Apr 24, 16:55 UTC | Apr 24, 17:50 UTC | 55m |
| 2026-04-19 | N258SP | - | Apr 19, 16:25 UTC | Apr 19, 17:25 UTC | 1h 0m |
| 2026-04-19 | N258SP | - | Apr 19, 14:20 UTC | Apr 19, 15:20 UTC | 1h 0m |
| 2026-04-18 | N258SP | - | Apr 18, 17:05 UTC | Apr 18, 18:00 UTC | 55m |
| 2026-04-16 | N258SP | - | Apr 16, 15:15 UTC | Apr 16, 15:25 UTC | 10m |
| 2026-04-16 | N258SP | - | Apr 16, 14:25 UTC | Apr 16, 15:10 UTC | 45m |
| 2026-04-14 | N258SP | - | Apr 14, 15:50 UTC | Apr 14, 16:45 UTC | 55m |
| 2026-04-14 | N258SP | - | Apr 14, 14:50 UTC | Apr 14, 15:00 UTC | 10m |
| 2026-04-14 | N258SP | - | Apr 14, 13:25 UTC | Apr 14, 14:45 UTC | 1h 20m |
| 2026-04-13 | N258SP | - | Apr 13, 18:10 UTC | Apr 13, 19:15 UTC | 1h 5m |
| 2026-04-13 | N258SP | - | Apr 13, 16:15 UTC | Apr 13, 17:05 UTC | 50m |
| 2026-04-13 | N258SP | - | Apr 13, 15:50 UTC | Apr 13, 17:05 UTC | 1h 15m |
| 2026-04-13 | N258SP | - | Apr 13, 15:35 UTC | Apr 13, 16:15 UTC | 40m |
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 N258SP page for operator, model, and routing details .