sensors Mode-S transponder
AC9A63
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N911AA · AEROSPATIALE AS-350 Ecureuil · operated by STATE OF ALASKA
- Hex
- AC9A63
- Octal
- 53115143
- Decimal
- 11,311,715
- Country
- US
- Tail
- N911AA
- Type
- AS50
- Flights observed
- 57
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 26, 18:55 UTC
Last known position
Country allocation
The ICAO 24-bit address AC9A63 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 |
|---|---|---|---|
| N911AA | - | 57 | 2026-07-26 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | N911AA | - | Jul 26, 18:40 UTC | Jul 26, 18:55 UTC | 15m |
| 2026-07-26 | N911AA | - | Jul 26, 16:40 UTC | Jul 26, 18:00 UTC | 1h 20m |
| 2026-07-25 | N911AA | - | Jul 25, 20:05 UTC | Jul 25, 22:45 UTC | 2h 40m |
| 2026-07-25 | N911AA | - | Jul 25, 16:45 UTC | Jul 25, 18:55 UTC | 2h 10m |
| 2026-07-24 | N911AA | - | Jul 24, 01:25 UTC | Jul 24, 01:40 UTC | 15m |
| 2026-07-24 | N911AA | - | Jul 24, 00:05 UTC | Jul 24, 00:20 UTC | 15m |
| 2026-07-22 | N911AA | - | Jul 22, 03:40 UTC | Jul 22, 03:55 UTC | 15m |
| 2026-07-22 | N911AA | - | Jul 22, 01:10 UTC | Jul 22, 01:20 UTC | 10m |
| 2026-07-21 | N911AA | - | Jul 21, 01:10 UTC | Jul 21, 02:25 UTC | 1h 15m |
| 2026-07-20 | N911AA | - | Jul 20, 22:40 UTC | Jul 21, 00:55 UTC | 2h 15m |
| 2026-07-20 | N911AA | - | Jul 20, 00:20 UTC | Jul 20, 00:30 UTC | 10m |
| 2026-07-19 | N911AA | - | Jul 19, 22:45 UTC | Jul 19, 23:00 UTC | 15m |
| 2026-07-19 | N911AA | - | Jul 19, 21:05 UTC | Jul 19, 21:40 UTC | 35m |
| 2026-07-19 | N911AA | - | Jul 19, 16:25 UTC | Jul 19, 16:40 UTC | 15m |
| 2026-07-14 | N911AA | - | Jul 14, 15:50 UTC | Jul 14, 17:00 UTC | 1h 10m |
| 2026-07-13 | N911AA | - | Jul 13, 21:15 UTC | Jul 13, 22:00 UTC | 45m |
| 2026-07-11 | N911AA | - | Jul 11, 20:10 UTC | Jul 11, 20:20 UTC | 10m |
| 2026-07-11 | N911AA | - | Jul 11, 17:55 UTC | Jul 11, 18:05 UTC | 10m |
| 2026-07-11 | N911AA | - | Jul 11, 00:15 UTC | Jul 11, 01:15 UTC | 1h 0m |
| 2026-07-06 | N911AA | - | Jul 6, 21:25 UTC | Jul 6, 21:55 UTC | 30m |
| 2026-07-06 | N911AA | - | Jul 6, 17:25 UTC | Jul 6, 18:00 UTC | 35m |
| 2026-07-04 | N911AA | - | Jul 4, 02:15 UTC | Jul 4, 02:35 UTC | 20m |
| 2026-07-03 | N911AA | - | Jul 3, 19:05 UTC | Jul 3, 19:40 UTC | 35m |
| 2026-06-29 | N911AA | - | Jun 29, 17:55 UTC | Jun 29, 18:10 UTC | 15m |
| 2026-06-25 | N911AA | - | Jun 25, 21:20 UTC | Jun 25, 21:44 UTC | 25m |
| 2026-06-24 | N911AA | - | Jun 24, 00:30 UTC | Jun 24, 02:45 UTC | 2h 15m |
| 2026-06-21 | N911AA | - | Jun 21, 22:20 UTC | Jun 21, 23:34 UTC | 1h 15m |
| 2026-06-19 | N911AA | - | Jun 19, 23:34 UTC | Jun 20, 00:04 UTC | 30m |
| 2026-06-19 | N911AA | - | Jun 19, 20:49 UTC | Jun 19, 21:04 UTC | 15m |
| 2026-06-16 | N911AA | - | Jun 16, 00:55 UTC | Jun 16, 01:10 UTC | 15m |
| 2026-06-15 | N911AA | - | Jun 15, 19:55 UTC | Jun 15, 20:15 UTC | 20m |
| 2026-06-12 | N911AA | - | Jun 12, 16:00 UTC | Jun 12, 17:05 UTC | 1h 5m |
| 2026-06-11 | N911AA | - | Jun 11, 19:20 UTC | Jun 11, 20:10 UTC | 50m |
| 2026-06-05 | N911AA | - | Jun 5, 20:00 UTC | Jun 5, 22:00 UTC | 2h 0m |
| 2026-06-01 | N911AA | - | Jun 1, 17:40 UTC | Jun 1, 20:00 UTC | 2h 20m |
| 2026-05-31 | N911AA | - | May 31, 23:05 UTC | May 31, 23:15 UTC | 10m |
| 2026-05-31 | N911AA | - | May 31, 19:45 UTC | May 31, 19:55 UTC | 10m |
| 2026-05-23 | N911AA | - | May 23, 19:15 UTC | May 23, 19:50 UTC | 35m |
| 2026-05-23 | N911AA | - | May 23, 17:50 UTC | May 23, 18:05 UTC | 15m |
| 2026-05-20 | N911AA | - | May 20, 19:55 UTC | May 20, 20:55 UTC | 1h 0m |
| 2026-05-19 | N911AA | - | May 19, 23:40 UTC | May 19, 23:55 UTC | 15m |
| 2026-05-16 | N911AA | - | May 16, 19:40 UTC | May 16, 19:50 UTC | 10m |
| 2026-05-16 | N911AA | - | May 16, 17:50 UTC | May 16, 18:05 UTC | 15m |
| 2026-05-14 | N911AA | - | May 14, 01:15 UTC | May 14, 01:25 UTC | 10m |
| 2026-05-13 | N911AA | - | May 13, 18:15 UTC | May 13, 18:35 UTC | 20m |
| 2026-05-10 | N911AA | - | May 10, 23:19 UTC | May 10, 23:35 UTC | 15m |
| 2026-05-10 | N911AA | - | May 10, 18:35 UTC | May 10, 18:49 UTC | 15m |
| 2026-05-07 | N911AA | - | May 7, 20:40 UTC | May 7, 20:50 UTC | 10m |
| 2026-05-05 | N911AA | - | May 5, 20:05 UTC | May 5, 21:01 UTC | 55m |
| 2026-05-04 | N911AA | - | May 4, 18:40 UTC | May 4, 21:55 UTC | 3h 15m |
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 N911AA page for operator, model, and routing details .