sensors Mode-S transponder
A276A5
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N258QS · BOMBARDIER CL-600 Challenger · operated by DESMOND BEACH AVIATION LLC, FLORENCE WALTERS LLC, MONTAG JANET, NODELMAN OLEG TRUSTEE, NODELMAN HEATHER TRUSTEE, PLANET AIR LLC
- Hex
- A276A5
- Octal
- 50473245
- Decimal
- 10,647,205
- Country
- US
- Tail
- N258QS
- Type
- CL60
- Flights observed
- 77
- Distinct callsigns
- 2
- Country
- US
- Last broadcast
- 17d ago
Last known position
Country allocation
The ICAO 24-bit address A276A5 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 2 distinct
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-22 | EJA258 | BOS → HPN | Jul 22, 19:40 UTC | Jul 22, 21:30 UTC | 1h 50m |
| 2026-07-22 | EJA258 | BOS → HPN | Jul 22, 17:45 UTC | Jul 22, 18:25 UTC | 40m |
| 2026-07-22 | EJA258 | BOS → HPN | Jul 22, 13:30 UTC | Jul 22, 15:45 UTC | 2h 15m |
| 2026-07-21 | N258QS | - | Jul 21, 17:05 UTC | Jul 21, 17:25 UTC | 20m |
| 2026-07-21 | N258QS | - | Jul 21, 12:55 UTC | Jul 21, 15:00 UTC | 2h 5m |
| 2026-07-20 | EJA258 | BOS → HPN | Jul 20, 21:35 UTC | Jul 20, 22:35 UTC | 1h 0m |
| 2026-07-20 | EJA258 | BOS → HPN | Jul 20, 17:35 UTC | Jul 20, 20:35 UTC | 3h 0m |
| 2026-07-20 | EJA258 | BOS → HPN | Jul 20, 15:55 UTC | Jul 20, 16:25 UTC | 30m |
| 2026-07-20 | EJA258 | BOS → HPN | Jul 20, 00:15 UTC | Jul 20, 00:50 UTC | 35m |
| 2026-07-19 | EJA258 | BOS → HPN | Jul 19, 21:55 UTC | Jul 19, 22:35 UTC | 40m |
| 2026-07-19 | EJA258 | BOS → HPN | Jul 19, 18:55 UTC | Jul 19, 20:50 UTC | 1h 55m |
| 2026-07-19 | EJA258 | BOS → HPN | Jul 19, 15:35 UTC | Jul 19, 17:45 UTC | 2h 10m |
| 2026-07-18 | N258QS | - | Jul 18, 15:55 UTC | Jul 18, 19:05 UTC | 3h 10m |
| 2026-07-18 | N258QS | - | Jul 18, 02:19 UTC | Jul 18, 02:35 UTC | 15m |
| 2026-07-17 | N258QS | VNY → SJO | Jul 17, 20:10 UTC | Jul 18, 01:20 UTC | 5h 10m |
| 2026-07-13 | N258QS | - | Jul 13, 21:35 UTC | Jul 13, 23:00 UTC | 1h 25m |
| 2026-07-13 | N258QS | - | Jul 13, 15:55 UTC | Jul 13, 17:20 UTC | 1h 25m |
| 2026-07-11 | EJA258 | - | Jul 11, 19:45 UTC | Jul 11, 21:15 UTC | 1h 30m |
| 2026-07-10 | EJA258 | - | Jul 10, 22:20 UTC | Jul 10, 23:35 UTC | 1h 15m |
| 2026-07-10 | EJA258 | - | Jul 10, 15:10 UTC | Jul 10, 16:30 UTC | 1h 20m |
| 2026-07-09 | EJA258 | - | Jul 9, 22:20 UTC | Jul 9, 23:20 UTC | 1h 0m |
| 2026-07-09 | EJA258 | COE → USA | Jul 9, 17:05 UTC | Jul 9, 20:55 UTC | 3h 50m |
| 2026-07-09 | EJA258 | - | Jul 9, 12:45 UTC | Jul 9, 16:05 UTC | 3h 20m |
| 2026-07-08 | EJA258 | TEB → DAL | Jul 8, 17:00 UTC | Jul 8, 20:00 UTC | 3h 0m |
| 2026-06-29 | EJA258 | BOS → TEB | Jun 29, 20:59 UTC | Jun 29, 21:50 UTC | 50m |
| 2026-06-29 | EJA258 | IAD → BOS | Jun 29, 18:55 UTC | Jun 29, 20:00 UTC | 1h 5m |
| 2026-06-29 | EJA258 | - | Jun 29, 14:19 UTC | Jun 29, 15:34 UTC | 1h 15m |
| 2026-06-28 | EJA258 | - | Jun 28, 19:14 UTC | Jun 28, 20:39 UTC | 1h 25m |
| 2026-06-28 | EJA258 | - | Jun 28, 16:25 UTC | Jun 28, 17:39 UTC | 1h 15m |
| 2026-06-28 | EJA258 | - | Jun 28, 13:34 UTC | Jun 28, 13:45 UTC | 10m |
| 2026-06-26 | EJA258 | BOS → HPN | Jun 26, 17:54 UTC | Jun 26, 19:30 UTC | 1h 35m |
| 2026-06-26 | EJA258 | BOS → HPN | Jun 26, 15:34 UTC | Jun 26, 17:09 UTC | 1h 35m |
| 2026-06-25 | N258QS | DAL → APA | Jun 25, 14:44 UTC | Jun 25, 23:19 UTC | 8h 35m |
| 2026-06-24 | EJA258 | BOS → HPN | Jun 24, 17:34 UTC | Jun 24, 19:04 UTC | 1h 30m |
| 2026-06-10 | EJA258 | BOS → HPN | Jun 10, 18:25 UTC | Jun 10, 19:50 UTC | 1h 25m |
| 2026-05-29 | EJA258 | BOS → HPN | May 29, 18:05 UTC | May 29, 20:25 UTC | 2h 20m |
| 2026-05-19 | EJA258 | BOS → HPN | May 19, 15:50 UTC | May 19, 16:25 UTC | 35m |
| 2026-05-19 | EJA258 | BOS → HPN | May 19, 12:55 UTC | May 19, 14:40 UTC | 1h 45m |
| 2026-05-18 | EJA258 | BOS → HPN | May 18, 21:25 UTC | May 18, 23:15 UTC | 1h 50m |
| 2026-05-17 | EJA258 | BOS → HPN | May 17, 15:50 UTC | May 17, 16:25 UTC | 35m |
| 2026-05-16 | EJA258 | BOS → HPN | May 16, 16:25 UTC | May 16, 16:40 UTC | 15m |
| 2026-05-16 | EJA258 | BOS → HPN | May 16, 13:41 UTC | May 16, 15:20 UTC | 1h 40m |
| 2026-05-15 | EJA258 | BOS → HPN | May 15, 15:35 UTC | May 15, 18:15 UTC | 2h 40m |
| 2026-05-14 | EJA258 | BOS → HPN | May 14, 20:00 UTC | May 14, 22:25 UTC | 2h 25m |
| 2026-05-14 | EJA258 | BOS → HPN | May 14, 16:40 UTC | May 14, 17:55 UTC | 1h 15m |
| 2026-05-13 | EJA258 | BOS → HPN | May 13, 22:20 UTC | May 14, 00:05 UTC | 1h 45m |
| 2026-05-13 | EJA258 | BOS → HPN | May 13, 18:50 UTC | May 13, 20:20 UTC | 1h 30m |
| 2026-05-11 | EJA258 | BOS → HPN | May 11, 12:10 UTC | May 11, 14:40 UTC | 2h 30m |
| 2026-05-08 | EJA258 | BOS → HPN | May 8, 22:00 UTC | May 8, 22:45 UTC | 45m |
| 2026-05-08 | EJA258 | BOS → HPN | May 8, 16:40 UTC | May 8, 17:05 UTC | 25m |
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 N258QS page for operator, model, and routing details .