sensors Mode-S transponder
AC939F
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N90947 · PIPER PA-18 Super Cub · operated by MACLEOD ANDREW S, MACLEOD VANESSA V
- Hex
- AC939F
- Octal
- 53111637
- Decimal
- 11,309,983
- Country
- US
- Tail
- N90947
- Type
- PA18
- Flights observed
- 31
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 25, 21:30 UTC
Last known position
Country allocation
The ICAO 24-bit address AC939F 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 |
|---|---|---|---|
| N90947 | - | 31 | 2026-07-25 |
Recent flights last 31
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | N90947 | - | Jul 25, 21:15 UTC | Jul 25, 21:30 UTC | 15m |
| 2026-07-25 | N90947 | - | Jul 25, 20:30 UTC | Jul 25, 21:10 UTC | 40m |
| 2026-07-25 | N90947 | - | Jul 25, 19:15 UTC | Jul 25, 19:35 UTC | 20m |
| 2026-07-24 | N90947 | - | Jul 24, 20:55 UTC | Jul 24, 21:40 UTC | 45m |
| 2026-07-22 | N90947 | - | Jul 22, 23:40 UTC | Jul 23, 00:00 UTC | 20m |
| 2026-07-19 | N90947 | - | Jul 19, 00:15 UTC | Jul 19, 00:35 UTC | 20m |
| 2026-07-11 | N90947 | - | Jul 11, 00:10 UTC | Jul 11, 00:35 UTC | 25m |
| 2026-07-10 | N90947 | - | Jul 10, 23:00 UTC | Jul 10, 23:15 UTC | 15m |
| 2026-07-05 | N90947 | - | Jul 5, 21:00 UTC | Jul 5, 21:20 UTC | 20m |
| 2026-07-01 | N90947 | - | Jul 1, 23:50 UTC | Jul 2, 00:45 UTC | 55m |
| 2026-07-01 | N90947 | - | Jul 1, 21:55 UTC | Jul 1, 22:20 UTC | 25m |
| 2026-06-21 | N90947 | - | Jun 21, 23:05 UTC | Jun 21, 23:44 UTC | 40m |
| 2026-06-20 | N90947 | - | Jun 20, 01:29 UTC | Jun 20, 03:14 UTC | 1h 45m |
| 2026-06-05 | N90947 | - | Jun 5, 23:45 UTC | Jun 6, 00:05 UTC | 20m |
| 2026-06-05 | N90947 | - | Jun 5, 20:40 UTC | Jun 5, 21:05 UTC | 25m |
| 2026-06-05 | N90947 | - | Jun 5, 19:45 UTC | Jun 5, 20:00 UTC | 15m |
| 2026-05-31 | N90947 | - | May 31, 19:20 UTC | May 31, 20:00 UTC | 40m |
| 2026-05-29 | N90947 | - | May 29, 23:20 UTC | May 29, 23:40 UTC | 20m |
| 2026-05-29 | N90947 | - | May 29, 22:15 UTC | May 29, 22:35 UTC | 20m |
| 2026-05-29 | N90947 | - | May 29, 20:55 UTC | May 29, 21:15 UTC | 20m |
| 2026-05-28 | N90947 | - | May 28, 22:55 UTC | May 28, 23:20 UTC | 25m |
| 2026-05-28 | N90947 | - | May 28, 20:20 UTC | May 28, 20:45 UTC | 25m |
| 2026-05-18 | N90947 | - | May 18, 17:10 UTC | May 18, 20:10 UTC | 2h 59m |
| 2026-05-15 | N90947 | - | May 15, 23:45 UTC | May 15, 23:55 UTC | 10m |
| 2026-05-08 | N90947 | - | May 8, 22:40 UTC | May 8, 23:05 UTC | 25m |
| 2026-04-26 | N90947 | - | Apr 26, 19:55 UTC | Apr 26, 20:25 UTC | 30m |
| 2026-04-25 | N90947 | - | Apr 25, 20:15 UTC | Apr 25, 21:30 UTC | 1h 15m |
| 2026-04-22 | N90947 | - | Apr 22, 22:35 UTC | Apr 22, 23:45 UTC | 1h 10m |
| 2026-04-15 | N90947 | - | Apr 15, 01:20 UTC | Apr 15, 01:45 UTC | 25m |
| 2026-04-15 | N90947 | - | Apr 15, 00:55 UTC | Apr 15, 01:15 UTC | 20m |
| 2026-04-13 | N90947 | - | Apr 13, 16:15 UTC | Apr 13, 16:30 UTC | 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 N90947 page for operator, model, and routing details .