sensors Mode-S transponder
A8C45A
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N664P · EMBRAER EMB-550 Praetor 600
- Hex
- A8C45A
- Octal
- 52142132
- Decimal
- 11,060,314
- Country
- US
- Tail
- N664P
- Type
- E550
- Flights observed
- 49
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 14d ago
Last known position
Country allocation
The ICAO 24-bit address A8C45A 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 |
|---|---|---|---|
| N664P | - | 49 | 2026-07-16 |
Recent flights last 49
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-16 | N664P | - | Jul 16, 22:35 UTC | Jul 17, 02:05 UTC | 3h 30m |
| 2026-07-15 | N664P | - | Jul 15, 20:10 UTC | Jul 15, 23:45 UTC | 3h 35m |
| 2026-07-10 | N664P | - | Jul 10, 20:55 UTC | Jul 10, 23:45 UTC | 2h 50m |
| 2026-07-10 | N664P | - | Jul 10, 16:55 UTC | Jul 10, 19:55 UTC | 3h 0m |
| 2026-07-10 | N664P | - | Jul 10, 15:10 UTC | Jul 10, 15:40 UTC | 30m |
| 2026-07-09 | N664P | - | Jul 9, 21:30 UTC | Jul 9, 22:05 UTC | 35m |
| 2026-07-09 | N664P | - | Jul 9, 17:00 UTC | Jul 9, 20:50 UTC | 3h 50m |
| 2026-07-07 | N664P | - | Jul 7, 18:35 UTC | Jul 7, 21:50 UTC | 3h 15m |
| 2026-07-07 | N664P | - | Jul 7, 15:00 UTC | Jul 7, 16:50 UTC | 1h 50m |
| 2026-06-24 | N664P | - | Jun 24, 21:29 UTC | Jun 25, 00:40 UTC | 3h 10m |
| 2026-06-24 | N664P | IAH → HPN | Jun 24, 16:05 UTC | Jun 24, 19:20 UTC | 3h 15m |
| 2026-06-19 | N664P | - | Jun 19, 20:29 UTC | Jun 19, 23:34 UTC | 3h 5m |
| 2026-06-18 | N664P | - | Jun 18, 17:15 UTC | Jun 18, 20:25 UTC | 3h 10m |
| 2026-06-12 | N664P | - | Jun 12, 13:40 UTC | Jun 12, 15:50 UTC | 2h 10m |
| 2026-06-11 | N664P | - | Jun 11, 17:05 UTC | Jun 11, 18:15 UTC | 1h 10m |
| 2026-06-11 | N664P | - | Jun 11, 10:40 UTC | Jun 11, 16:30 UTC | 5h 50m |
| 2026-06-03 | N664P | - | Jun 3, 20:30 UTC | Jun 3, 23:25 UTC | 2h 55m |
| 2026-06-02 | N664P | - | Jun 2, 21:25 UTC | Jun 3, 00:15 UTC | 2h 50m |
| 2026-06-02 | N664P | - | Jun 2, 13:35 UTC | Jun 2, 14:45 UTC | 1h 10m |
| 2026-06-01 | N664P | - | Jun 1, 18:00 UTC | Jun 1, 19:05 UTC | 1h 5m |
| 2026-05-29 | N664P | - | May 29, 15:45 UTC | May 29, 19:00 UTC | 3h 15m |
| 2026-05-27 | N664P | - | May 27, 17:15 UTC | May 27, 20:20 UTC | 3h 5m |
| 2026-05-19 | N664P | - | May 19, 00:25 UTC | May 19, 02:55 UTC | 2h 30m |
| 2026-05-18 | N664P | - | May 18, 16:15 UTC | May 18, 18:30 UTC | 2h 14m |
| 2026-05-17 | N664P | - | May 17, 21:25 UTC | May 17, 23:55 UTC | 2h 30m |
| 2026-05-17 | N664P | - | May 17, 18:45 UTC | May 17, 20:40 UTC | 1h 55m |
| 2026-05-13 | N664P | - | May 13, 17:20 UTC | May 13, 19:30 UTC | 2h 10m |
| 2026-05-13 | N664P | - | May 13, 14:25 UTC | May 13, 16:05 UTC | 1h 40m |
| 2026-05-11 | N664P | - | May 11, 20:00 UTC | May 11, 20:30 UTC | 30m |
| 2026-05-11 | N664P | - | May 11, 18:30 UTC | May 11, 18:55 UTC | 25m |
| 2026-05-11 | N664P | - | May 11, 15:40 UTC | May 11, 17:00 UTC | 1h 21m |
| 2026-05-11 | N664P | - | May 11, 13:35 UTC | May 11, 14:35 UTC | 1h 0m |
| 2026-05-10 | N664P | - | May 10, 22:20 UTC | May 11, 00:49 UTC | 2h 30m |
| 2026-05-10 | N664P | - | May 10, 17:55 UTC | May 10, 19:40 UTC | 1h 45m |
| 2026-05-06 | N664P | - | May 6, 22:10 UTC | May 7, 02:15 UTC | 4h 5m |
| 2026-05-05 | N664P | - | May 5, 01:45 UTC | May 5, 02:01 UTC | 15m |
| 2026-05-05 | N664P | - | May 5, 00:10 UTC | May 5, 00:25 UTC | 15m |
| 2026-05-03 | N664P | - | May 3, 19:55 UTC | May 3, 22:39 UTC | 2h 45m |
| 2026-05-01 | N664P | - | May 1, 20:55 UTC | May 1, 22:00 UTC | 1h 5m |
| 2026-04-30 | N664P | - | Apr 30, 21:30 UTC | Apr 30, 22:50 UTC | 1h 20m |
| 2026-04-30 | N664P | - | Apr 30, 13:25 UTC | Apr 30, 16:15 UTC | 2h 50m |
| 2026-04-29 | N664P | - | Apr 29, 16:20 UTC | Apr 29, 19:45 UTC | 3h 25m |
| 2026-04-28 | N664P | - | Apr 28, 15:45 UTC | Apr 28, 18:25 UTC | 2h 40m |
| 2026-04-27 | N664P | - | Apr 27, 21:55 UTC | Apr 28, 00:15 UTC | 2h 20m |
| 2026-04-14 | N664P | - | Apr 14, 22:55 UTC | Apr 14, 23:25 UTC | 30m |
| 2026-04-14 | N664P | - | Apr 14, 21:15 UTC | Apr 14, 22:50 UTC | 1h 35m |
| 2026-04-14 | N664P | - | Apr 14, 16:50 UTC | Apr 14, 17:35 UTC | 45m |
| 2026-04-14 | N664P | - | Apr 14, 12:50 UTC | Apr 14, 13:25 UTC | 35m |
| 2026-04-14 | N664P | - | Apr 14, 12:20 UTC | Apr 14, 12:45 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 N664P page for operator, model, and routing details .