sensors Mode-S transponder
A21C6E
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N235PX · operated by GONS STEPHEN E
- Hex
- A21C6E
- Octal
- 50416156
- Decimal
- 10,624,110
- Country
- US
- Tail
- N235PX
- Type
- C182
- Flights observed
- 33
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 24, 14:40 UTC
Last known position
Country allocation
The ICAO 24-bit address A21C6E 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 |
|---|---|---|---|
| N235PX | - | 33 | 2026-07-24 |
Recent flights last 33
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-24 | N235PX | - | Jul 24, 13:50 UTC | Jul 24, 14:40 UTC | 50m |
| 2026-07-23 | N235PX | - | Jul 23, 17:55 UTC | Jul 23, 18:45 UTC | 50m |
| 2026-07-18 | N235PX | - | Jul 18, 14:10 UTC | Jul 18, 15:35 UTC | 1h 25m |
| 2026-07-17 | N235PX | - | Jul 17, 16:44 UTC | Jul 17, 18:00 UTC | 1h 15m |
| 2026-07-14 | N235PX | - | Jul 14, 17:35 UTC | Jul 14, 18:15 UTC | 40m |
| 2026-07-13 | N235PX | - | Jul 13, 13:25 UTC | Jul 13, 14:10 UTC | 45m |
| 2026-07-08 | N235PX | - | Jul 8, 21:25 UTC | Jul 8, 22:05 UTC | 40m |
| 2026-07-08 | N235PX | - | Jul 8, 14:35 UTC | Jul 8, 15:25 UTC | 50m |
| 2026-07-06 | N235PX | - | Jul 6, 19:25 UTC | Jul 6, 20:20 UTC | 55m |
| 2026-07-06 | N235PX | - | Jul 6, 13:00 UTC | Jul 6, 13:55 UTC | 55m |
| 2026-06-26 | N235PX | - | Jun 26, 19:09 UTC | Jun 26, 20:24 UTC | 1h 15m |
| 2026-06-25 | N235PX | - | Jun 25, 10:15 UTC | Jun 25, 11:10 UTC | 55m |
| 2026-06-21 | N235PX | - | Jun 21, 19:05 UTC | Jun 21, 19:55 UTC | 50m |
| 2026-06-21 | N235PX | - | Jun 21, 12:10 UTC | Jun 21, 13:00 UTC | 50m |
| 2026-06-15 | N235PX | - | Jun 15, 18:40 UTC | Jun 15, 19:20 UTC | 40m |
| 2026-06-13 | N235PX | - | Jun 13, 15:10 UTC | Jun 13, 16:00 UTC | 50m |
| 2026-06-10 | N235PX | - | Jun 10, 17:55 UTC | Jun 10, 18:45 UTC | 50m |
| 2026-06-01 | N235PX | - | Jun 1, 18:20 UTC | Jun 1, 19:15 UTC | 55m |
| 2026-05-28 | N235PX | - | May 28, 19:10 UTC | May 28, 20:05 UTC | 55m |
| 2026-05-22 | N235PX | - | May 22, 10:45 UTC | May 22, 11:35 UTC | 50m |
| 2026-05-21 | N235PX | - | May 21, 20:00 UTC | May 21, 20:55 UTC | 55m |
| 2026-05-20 | N235PX | - | May 20, 17:45 UTC | May 20, 18:35 UTC | 50m |
| 2026-05-17 | N235PX | - | May 17, 16:35 UTC | May 17, 19:35 UTC | 3h 0m |
| 2026-05-15 | N235PX | - | May 15, 13:10 UTC | May 15, 17:35 UTC | 4h 24m |
| 2026-05-13 | N235PX | - | May 13, 14:15 UTC | May 13, 15:00 UTC | 45m |
| 2026-05-12 | N235PX | - | May 12, 16:40 UTC | May 12, 17:35 UTC | 55m |
| 2026-04-27 | N235PX | - | Apr 27, 17:45 UTC | Apr 27, 18:35 UTC | 50m |
| 2026-04-26 | N235PX | - | Apr 26, 20:05 UTC | Apr 26, 23:20 UTC | 3h 15m |
| 2026-04-25 | N235PX | - | Apr 25, 12:00 UTC | Apr 25, 16:50 UTC | 4h 50m |
| 2026-04-21 | N235PX | - | Apr 21, 16:40 UTC | Apr 21, 17:30 UTC | 50m |
| 2026-04-18 | N235PX | - | Apr 18, 15:40 UTC | Apr 18, 16:35 UTC | 55m |
| 2026-04-17 | N235PX | - | Apr 17, 13:30 UTC | Apr 17, 14:10 UTC | 40m |
| 2026-04-16 | N235PX | - | Apr 16, 13:15 UTC | Apr 16, 13:50 UTC | 35m |
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 N235PX page for operator, model, and routing details .