sensors Mode-S transponder
A521F8
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N43NG · PILATUS PC-12 · operated by WING AND ROTOR TRANSPORTATION HOLDINGS LLC
- Hex
- A521F8
- Octal
- 51220770
- Decimal
- 10,822,136
- Country
- US
- Tail
- N43NG
- Type
- PC12
- Flights observed
- 66
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 11d ago
Last known position
Country allocation
The ICAO 24-bit address A521F8 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 |
|---|---|---|---|
| N43NG | - | 66 | 2026-07-22 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-22 | N43NG | - | Jul 22, 23:35 UTC | Jul 23, 02:15 UTC | 2h 40m |
| 2026-07-22 | N43NG | - | Jul 22, 19:10 UTC | Jul 22, 19:25 UTC | 15m |
| 2026-07-20 | N43NG | - | Jul 20, 02:45 UTC | Jul 20, 03:00 UTC | 15m |
| 2026-07-19 | N43NG | - | Jul 19, 23:55 UTC | Jul 20, 02:15 UTC | 2h 20m |
| 2026-07-15 | N43NG | - | Jul 15, 23:25 UTC | Jul 16, 01:45 UTC | 2h 20m |
| 2026-07-15 | N43NG | - | Jul 15, 19:05 UTC | Jul 15, 19:30 UTC | 25m |
| 2026-07-13 | N43NG | LGA → MMU | Jul 13, 02:01 UTC | Jul 13, 02:20 UTC | 20m |
| 2026-07-12 | N43NG | - | Jul 12, 23:05 UTC | Jul 13, 01:35 UTC | 2h 30m |
| 2026-07-08 | N43NG | - | Jul 8, 23:20 UTC | Jul 9, 01:45 UTC | 2h 25m |
| 2026-07-08 | N43NG | - | Jul 8, 19:40 UTC | Jul 8, 20:05 UTC | 25m |
| 2026-07-06 | N43NG | - | Jul 6, 22:20 UTC | Jul 6, 22:45 UTC | 25m |
| 2026-07-06 | N43NG | - | Jul 6, 19:20 UTC | Jul 6, 21:40 UTC | 2h 20m |
| 2026-06-30 | N43NG | - | Jun 30, 22:45 UTC | Jul 1, 01:00 UTC | 2h 15m |
| 2026-06-30 | N43NG | - | Jun 30, 18:45 UTC | Jun 30, 19:00 UTC | 15m |
| 2026-06-29 | N43NG | - | Jun 29, 14:39 UTC | Jun 29, 15:00 UTC | 20m |
| 2026-06-29 | N43NG | - | Jun 29, 11:39 UTC | Jun 29, 14:04 UTC | 2h 25m |
| 2026-06-24 | N43NG | - | Jun 24, 23:24 UTC | Jun 25, 01:54 UTC | 2h 30m |
| 2026-06-24 | N43NG | - | Jun 24, 19:39 UTC | Jun 24, 19:55 UTC | 15m |
| 2026-06-22 | N43NG | - | Jun 22, 02:25 UTC | Jun 22, 02:45 UTC | 20m |
| 2026-06-21 | N43NG | CHS → LGA | Jun 21, 23:44 UTC | Jun 22, 02:00 UTC | 2h 15m |
| 2026-06-18 | N43NG | - | Jun 18, 01:30 UTC | Jun 18, 04:00 UTC | 2h 30m |
| 2026-06-17 | N43NG | - | Jun 17, 20:50 UTC | Jun 17, 21:15 UTC | 25m |
| 2026-06-15 | N43NG | - | Jun 15, 02:44 UTC | Jun 15, 03:00 UTC | 15m |
| 2026-06-14 | N43NG | - | Jun 14, 23:59 UTC | Jun 15, 02:15 UTC | 2h 15m |
| 2026-06-10 | N43NG | - | Jun 10, 22:15 UTC | Jun 11, 00:40 UTC | 2h 25m |
| 2026-06-10 | N43NG | - | Jun 10, 19:05 UTC | Jun 10, 19:25 UTC | 20m |
| 2026-06-08 | N43NG | - | Jun 8, 02:55 UTC | Jun 8, 03:10 UTC | 15m |
| 2026-06-08 | N43NG | CHS → LGA | Jun 8, 00:00 UTC | Jun 8, 02:30 UTC | 2h 30m |
| 2026-06-07 | N43NG | - | Jun 7, 18:15 UTC | Jun 7, 20:35 UTC | 2h 20m |
| 2026-06-04 | N43NG | - | Jun 4, 17:05 UTC | Jun 4, 19:35 UTC | 2h 30m |
| 2026-06-04 | N43NG | - | Jun 4, 13:40 UTC | Jun 4, 15:55 UTC | 2h 15m |
| 2026-06-04 | N43NG | - | Jun 4, 10:45 UTC | Jun 4, 10:55 UTC | 10m |
| 2026-06-01 | N43NG | MMU → MMU | Jun 1, 03:25 UTC | Jun 1, 03:35 UTC | 10m |
| 2026-06-01 | N43NG | - | Jun 1, 02:20 UTC | Jun 1, 02:50 UTC | 30m |
| 2026-05-31 | N43NG | - | May 31, 23:45 UTC | Jun 1, 02:00 UTC | 2h 15m |
| 2026-05-27 | N43NG | - | May 27, 23:10 UTC | May 28, 01:45 UTC | 2h 35m |
| 2026-05-27 | N43NG | - | May 27, 19:15 UTC | May 27, 19:35 UTC | 20m |
| 2026-05-26 | N43NG | - | May 26, 02:29 UTC | May 26, 02:44 UTC | 15m |
| 2026-05-25 | N43NG | - | May 25, 23:45 UTC | May 26, 02:10 UTC | 2h 25m |
| 2026-05-21 | N43NG | - | May 21, 00:30 UTC | May 21, 02:55 UTC | 2h 25m |
| 2026-05-18 | N43NG | - | May 18, 02:45 UTC | May 18, 03:01 UTC | 15m |
| 2026-05-18 | N43NG | - | May 18, 00:05 UTC | May 18, 02:25 UTC | 2h 20m |
| 2026-05-14 | N43NG | - | May 14, 00:25 UTC | May 14, 03:00 UTC | 2h 35m |
| 2026-05-13 | N43NG | - | May 13, 22:10 UTC | May 13, 23:35 UTC | 1h 25m |
| 2026-05-12 | N43NG | - | May 12, 18:00 UTC | May 12, 19:30 UTC | 1h 30m |
| 2026-05-12 | N43NG | - | May 12, 15:55 UTC | May 12, 16:10 UTC | 15m |
| 2026-05-11 | N43NG | - | May 11, 14:25 UTC | May 11, 14:40 UTC | 15m |
| 2026-05-11 | N43NG | - | May 11, 12:00 UTC | May 11, 14:05 UTC | 2h 5m |
| 2026-05-06 | N43NG | - | May 6, 23:25 UTC | May 7, 02:05 UTC | 2h 40m |
| 2026-05-06 | N43NG | - | May 6, 17:10 UTC | May 6, 17:30 UTC | 20m |
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 N43NG page for operator, model, and routing details .