sensors Mode-S transponder
AC9A66
ICAO 24-bit transponder address · allocated to United States
- Hex
- AC9A66
- Octal
- 53115146
- Decimal
- 11,311,718
- Country
- US
- Flights observed
- 37
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 12d ago
Last known position
Country allocation
The ICAO 24-bit address AC9A66 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 |
|---|---|---|---|
| N911AD | - | 37 | 2026-07-25 |
Recent flights last 37
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | N911AD | - | Jul 25, 14:35 UTC | Jul 25, 15:30 UTC | 55m |
| 2026-07-23 | N911AD | - | Jul 23, 16:10 UTC | Jul 23, 19:15 UTC | 3h 5m |
| 2026-07-23 | N911AD | - | Jul 23, 10:40 UTC | Jul 23, 14:00 UTC | 3h 20m |
| 2026-07-17 | N911AD | - | Jul 17, 13:29 UTC | Jul 17, 15:40 UTC | 2h 10m |
| 2026-07-16 | N911AD | - | Jul 16, 17:45 UTC | Jul 16, 21:40 UTC | 3h 55m |
| 2026-07-12 | N911AD | - | Jul 12, 17:45 UTC | Jul 12, 18:15 UTC | 30m |
| 2026-07-12 | N911AD | - | Jul 12, 13:45 UTC | Jul 12, 14:15 UTC | 30m |
| 2026-07-11 | N911AD | - | Jul 11, 15:15 UTC | Jul 11, 16:10 UTC | 55m |
| 2026-07-05 | N911AD | - | Jul 5, 17:10 UTC | Jul 5, 18:05 UTC | 55m |
| 2026-07-04 | N911AD | - | Jul 4, 13:40 UTC | Jul 4, 14:35 UTC | 55m |
| 2026-06-30 | N911AD | - | Jun 30, 19:40 UTC | Jun 30, 19:50 UTC | 10m |
| 2026-06-30 | N911AD | - | Jun 30, 12:40 UTC | Jun 30, 12:50 UTC | 10m |
| 2026-06-29 | N911AD | - | Jun 29, 17:55 UTC | Jun 29, 18:34 UTC | 40m |
| 2026-06-29 | N911AD | - | Jun 29, 15:14 UTC | Jun 29, 15:54 UTC | 40m |
| 2026-06-25 | N911AD | - | Jun 25, 22:49 UTC | Jun 25, 23:19 UTC | 30m |
| 2026-06-17 | N911AD | - | Jun 17, 15:15 UTC | Jun 17, 15:40 UTC | 25m |
| 2026-06-13 | N911AD | - | Jun 13, 18:30 UTC | Jun 13, 19:15 UTC | 45m |
| 2026-06-13 | N911AD | - | Jun 13, 14:50 UTC | Jun 13, 15:30 UTC | 40m |
| 2026-06-10 | N911AD | - | Jun 10, 16:45 UTC | Jun 10, 16:55 UTC | 10m |
| 2026-06-10 | N911AD | - | Jun 10, 13:35 UTC | Jun 10, 13:45 UTC | 10m |
| 2026-06-06 | N911AD | - | Jun 6, 18:59 UTC | Jun 6, 19:44 UTC | 45m |
| 2026-06-06 | N911AD | - | Jun 6, 15:39 UTC | Jun 6, 16:20 UTC | 40m |
| 2026-06-03 | N911AD | - | Jun 3, 20:35 UTC | Jun 3, 21:15 UTC | 40m |
| 2026-06-03 | N911AD | - | Jun 3, 17:45 UTC | Jun 3, 18:20 UTC | 35m |
| 2026-05-29 | N911AD | - | May 29, 17:05 UTC | May 29, 17:50 UTC | 45m |
| 2026-05-29 | N911AD | - | May 29, 14:25 UTC | May 29, 15:00 UTC | 35m |
| 2026-05-27 | N911AD | - | May 27, 23:15 UTC | May 27, 23:40 UTC | 25m |
| 2026-05-27 | N911AD | - | May 27, 20:05 UTC | May 27, 20:35 UTC | 30m |
| 2026-05-18 | N911AD | - | May 18, 14:55 UTC | May 18, 18:15 UTC | 3h 20m |
| 2026-05-18 | N911AD | - | May 18, 10:50 UTC | May 18, 13:20 UTC | 2h 30m |
| 2026-05-13 | N911AD | - | May 13, 11:20 UTC | May 13, 14:00 UTC | 2h 40m |
| 2026-05-13 | N911AD | - | May 13, 06:00 UTC | May 13, 09:45 UTC | 3h 45m |
| 2026-04-26 | N911AD | - | Apr 26, 16:50 UTC | Apr 26, 21:20 UTC | 4h 30m |
| 2026-04-26 | N911AD | - | Apr 26, 12:45 UTC | Apr 26, 14:35 UTC | 1h 50m |
| 2026-04-20 | N911AD | - | Apr 20, 16:00 UTC | Apr 20, 18:20 UTC | 2h 20m |
| 2026-04-20 | N911AD | - | Apr 20, 10:10 UTC | Apr 20, 14:15 UTC | 4h 5m |
| 2026-04-14 | N911AD | - | Apr 14, 14:20 UTC | Apr 14, 14:45 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.