sensors Mode-S transponder
A6951F
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N523LT · DIAMOND DA-40 Club Star · operated by LIMA TANGO LLC
- Hex
- A6951F
- Octal
- 51512437
- Decimal
- 10,917,151
- Country
- US
- Tail
- N523LT
- Type
- DA40
- Flights observed
- 41
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 15h ago
Last known position
Country allocation
The ICAO 24-bit address A6951F 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 |
|---|---|---|---|
| N523LT | - | 41 | 2026-07-13 |
Recent flights last 41
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | N523LT | - | Jul 13, 13:40 UTC | Jul 13, 15:20 UTC | 1h 40m |
| 2026-07-12 | N523LT | - | Jul 12, 13:50 UTC | Jul 12, 15:35 UTC | 1h 45m |
| 2026-07-11 | N523LT | - | Jul 11, 14:00 UTC | Jul 11, 15:25 UTC | 1h 25m |
| 2026-07-10 | N523LT | - | Jul 10, 13:00 UTC | Jul 10, 14:45 UTC | 1h 45m |
| 2026-07-05 | N523LT | BDR → BDR | Jul 5, 13:50 UTC | Jul 5, 14:10 UTC | 20m |
| 2026-07-03 | N523LT | - | Jul 3, 15:15 UTC | Jul 3, 16:15 UTC | 1h 0m |
| 2026-07-03 | N523LT | - | Jul 3, 14:10 UTC | Jul 3, 14:25 UTC | 15m |
| 2026-06-26 | N523LT | - | Jun 26, 16:14 UTC | Jun 26, 16:24 UTC | 10m |
| 2026-06-26 | N523LT | BDR → HVN | Jun 26, 14:35 UTC | Jun 26, 16:09 UTC | 1h 35m |
| 2026-06-20 | N523LT | - | Jun 20, 12:24 UTC | Jun 20, 13:44 UTC | 1h 20m |
| 2026-06-12 | N523LT | - | Jun 12, 13:00 UTC | Jun 12, 13:45 UTC | 45m |
| 2026-06-07 | N523LT | - | Jun 7, 17:10 UTC | Jun 7, 19:50 UTC | 2h 40m |
| 2026-06-06 | N523LT | - | Jun 6, 20:30 UTC | Jun 6, 20:55 UTC | 25m |
| 2026-06-06 | N523LT | - | Jun 6, 19:24 UTC | Jun 6, 19:44 UTC | 20m |
| 2026-06-05 | N523LT | - | Jun 5, 16:15 UTC | Jun 5, 20:10 UTC | 3h 55m |
| 2026-06-02 | N523LT | - | Jun 2, 17:25 UTC | Jun 2, 18:30 UTC | 1h 5m |
| 2026-06-01 | N523LT | - | Jun 1, 21:00 UTC | Jun 1, 22:50 UTC | 1h 50m |
| 2026-06-01 | N523LT | BDR → BDR | Jun 1, 19:35 UTC | Jun 1, 20:10 UTC | 35m |
| 2026-05-31 | N523LT | - | May 31, 19:35 UTC | May 31, 20:00 UTC | 25m |
| 2026-05-31 | N523LT | - | May 31, 18:00 UTC | May 31, 18:30 UTC | 30m |
| 2026-05-26 | N523LT | - | May 26, 23:25 UTC | May 27, 01:19 UTC | 1h 55m |
| 2026-05-18 | N523LT | - | May 18, 21:10 UTC | May 19, 00:05 UTC | 2h 55m |
| 2026-05-18 | N523LT | - | May 18, 17:05 UTC | May 18, 18:45 UTC | 1h 39m |
| 2026-05-14 | N523LT | - | May 14, 18:15 UTC | May 14, 18:25 UTC | 10m |
| 2026-05-14 | N523LT | - | May 14, 15:55 UTC | May 14, 17:15 UTC | 1h 20m |
| 2026-05-14 | N523LT | - | May 14, 13:40 UTC | May 14, 15:15 UTC | 1h 35m |
| 2026-05-12 | N523LT | - | May 12, 19:00 UTC | May 12, 19:55 UTC | 55m |
| 2026-05-07 | N523LT | - | May 7, 17:45 UTC | May 7, 19:10 UTC | 1h 25m |
| 2026-05-05 | N523LT | - | May 5, 22:30 UTC | May 5, 23:55 UTC | 1h 25m |
| 2026-05-05 | N523LT | - | May 5, 20:50 UTC | May 5, 21:45 UTC | 55m |
| 2026-05-02 | N523LT | - | May 2, 18:55 UTC | May 2, 20:40 UTC | 1h 45m |
| 2026-04-27 | N523LT | BDR → BDR | Apr 27, 22:50 UTC | Apr 28, 01:40 UTC | 2h 50m |
| 2026-04-27 | N523LT | BDR → BDR | Apr 27, 19:10 UTC | Apr 27, 21:25 UTC | 2h 15m |
| 2026-04-26 | N523LT | - | Apr 26, 19:25 UTC | Apr 26, 20:35 UTC | 1h 10m |
| 2026-04-24 | N523LT | - | Apr 24, 16:50 UTC | Apr 24, 18:05 UTC | 1h 15m |
| 2026-04-24 | N523LT | - | Apr 24, 14:00 UTC | Apr 24, 15:00 UTC | 1h 0m |
| 2026-04-23 | N523LT | - | Apr 23, 11:30 UTC | Apr 23, 13:20 UTC | 1h 50m |
| 2026-04-16 | N523LT | - | Apr 16, 19:15 UTC | Apr 16, 19:55 UTC | 40m |
| 2026-04-16 | N523LT | - | Apr 16, 18:20 UTC | Apr 16, 19:10 UTC | 50m |
| 2026-04-12 | N523LT | - | Apr 12, 19:05 UTC | Apr 12, 19:55 UTC | 50m |
| 2026-04-12 | N523LT | - | Apr 12, 17:15 UTC | Apr 12, 18:15 UTC | 1h 0m |
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 N523LT page for operator, model, and routing details .