sensors Mode-S transponder
A6D59D
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N54AK · CESSNA T210 Turbo Centurion · operated by GREAT PLANES REPRODUCTIVE CENTERS PA
- Hex
- A6D59D
- Octal
- 51552635
- Decimal
- 10,933,661
- Country
- US
- Tail
- N54AK
- Type
- T210
- Flights observed
- 28
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 26, 17:50 UTC
Last known position
Country allocation
The ICAO 24-bit address A6D59D 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 |
|---|---|---|---|
| N54AK | - | 28 | 2026-07-26 |
Recent flights last 28
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | N54AK | - | Jul 26, 17:00 UTC | Jul 26, 17:50 UTC | 50m |
| 2026-07-25 | N54AK | - | Jul 25, 16:25 UTC | Jul 25, 17:10 UTC | 45m |
| 2026-07-24 | N54AK | - | Jul 24, 17:10 UTC | Jul 24, 17:35 UTC | 25m |
| 2026-07-05 | N54AK | - | Jul 5, 14:45 UTC | Jul 5, 15:40 UTC | 55m |
| 2026-07-02 | N54AK | - | Jul 2, 13:45 UTC | Jul 2, 14:25 UTC | 40m |
| 2026-06-30 | N54AK | - | Jun 30, 15:30 UTC | Jun 30, 15:40 UTC | 10m |
| 2026-06-30 | N54AK | - | Jun 30, 12:45 UTC | Jun 30, 13:00 UTC | 15m |
| 2026-06-29 | N54AK | - | Jun 29, 19:09 UTC | Jun 29, 21:44 UTC | 2h 35m |
| 2026-06-28 | N54AK | - | Jun 28, 14:54 UTC | Jun 28, 15:55 UTC | 1h 0m |
| 2026-06-26 | N54AK | - | Jun 26, 13:55 UTC | Jun 26, 17:59 UTC | 4h 5m |
| 2026-06-18 | N54AK | - | Jun 18, 21:55 UTC | Jun 18, 22:45 UTC | 50m |
| 2026-06-15 | N54AK | - | Jun 15, 21:20 UTC | Jun 15, 21:50 UTC | 30m |
| 2026-06-12 | N54AK | - | Jun 12, 18:25 UTC | Jun 12, 18:50 UTC | 25m |
| 2026-06-12 | N54AK | - | Jun 12, 15:45 UTC | Jun 12, 16:05 UTC | 20m |
| 2026-06-12 | N54AK | - | Jun 12, 13:50 UTC | Jun 12, 14:05 UTC | 15m |
| 2026-05-21 | N54AK | - | May 21, 19:35 UTC | May 21, 19:50 UTC | 15m |
| 2026-05-21 | N54AK | - | May 21, 18:30 UTC | May 21, 18:45 UTC | 15m |
| 2026-05-20 | N54AK | - | May 20, 23:15 UTC | May 20, 23:40 UTC | 25m |
| 2026-05-11 | N54AK | - | May 11, 16:10 UTC | May 11, 17:00 UTC | 50m |
| 2026-05-11 | N54AK | - | May 11, 15:00 UTC | May 11, 15:40 UTC | 40m |
| 2026-05-11 | N54AK | - | May 11, 11:50 UTC | May 11, 13:20 UTC | 1h 30m |
| 2026-05-08 | N54AK | - | May 8, 22:30 UTC | May 8, 22:55 UTC | 25m |
| 2026-05-08 | N54AK | - | May 8, 14:15 UTC | May 8, 14:45 UTC | 30m |
| 2026-04-26 | N54AK | - | Apr 26, 22:55 UTC | Apr 26, 23:30 UTC | 35m |
| 2026-04-26 | N54AK | - | Apr 26, 14:05 UTC | Apr 26, 14:40 UTC | 35m |
| 2026-04-24 | N54AK | - | Apr 24, 20:25 UTC | Apr 24, 20:35 UTC | 10m |
| 2026-04-24 | N54AK | - | Apr 24, 19:20 UTC | Apr 24, 19:45 UTC | 25m |
| 2026-04-23 | N54AK | - | Apr 23, 00:20 UTC | Apr 23, 00:45 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 N54AK page for operator, model, and routing details .