sensors Mode-S transponder
A9EE36
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N739TU · CESSNA 172 Skyhawk · operated by SOFLA SKY SOLUTIONS LLC, ALPHA AIRCRAFT INTERNATIONAL LLC
- Hex
- A9EE36
- Octal
- 52367066
- Decimal
- 11,136,566
- Country
- US
- Tail
- N739TU
- Type
- C172
- Flights observed
- 59
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 22, 22:50 UTC
Last known position
Country allocation
The ICAO 24-bit address A9EE36 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 |
|---|---|---|---|
| N739TU | - | 59 | 2026-07-22 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-22 | N739TU | - | Jul 22, 22:15 UTC | Jul 22, 22:50 UTC | 35m |
| 2026-07-21 | N739TU | - | Jul 21, 03:55 UTC | Jul 21, 04:15 UTC | 20m |
| 2026-07-21 | N739TU | - | Jul 21, 02:20 UTC | Jul 21, 03:25 UTC | 1h 5m |
| 2026-07-20 | N739TU | - | Jul 20, 23:05 UTC | Jul 20, 23:55 UTC | 49m |
| 2026-07-20 | N739TU | - | Jul 20, 22:00 UTC | Jul 20, 22:25 UTC | 25m |
| 2026-07-19 | N739TU | - | Jul 19, 22:55 UTC | Jul 19, 23:25 UTC | 30m |
| 2026-07-18 | N739TU | - | Jul 18, 15:50 UTC | Jul 18, 16:25 UTC | 35m |
| 2026-07-15 | N739TU | FXE → FXE | Jul 15, 00:00 UTC | Jul 15, 00:40 UTC | 40m |
| 2026-07-13 | N739TU | - | Jul 13, 20:50 UTC | Jul 13, 21:50 UTC | 1h 0m |
| 2026-07-13 | N739TU | - | Jul 13, 01:10 UTC | Jul 13, 02:20 UTC | 1h 10m |
| 2026-07-12 | N739TU | - | Jul 12, 15:05 UTC | Jul 12, 16:01 UTC | 55m |
| 2026-07-07 | N739TU | - | Jul 7, 14:45 UTC | Jul 7, 14:55 UTC | 10m |
| 2026-07-07 | N739TU | - | Jul 7, 13:30 UTC | Jul 7, 13:45 UTC | 15m |
| 2026-07-07 | N739TU | FXE → FXE | Jul 7, 11:55 UTC | Jul 7, 12:20 UTC | 25m |
| 2026-07-03 | N739TU | - | Jul 3, 13:50 UTC | Jul 3, 14:00 UTC | 10m |
| 2026-07-03 | N739TU | - | Jul 3, 12:20 UTC | Jul 3, 12:50 UTC | 30m |
| 2026-06-29 | N739TU | - | Jun 29, 23:34 UTC | Jun 30, 00:00 UTC | 25m |
| 2026-06-26 | N739TU | - | Jun 26, 14:29 UTC | Jun 26, 15:34 UTC | 1h 5m |
| 2026-06-20 | N739TU | - | Jun 20, 14:29 UTC | Jun 20, 14:39 UTC | 10m |
| 2026-06-20 | N739TU | - | Jun 20, 13:34 UTC | Jun 20, 13:49 UTC | 15m |
| 2026-06-18 | N739TU | - | Jun 18, 04:10 UTC | Jun 18, 04:40 UTC | 30m |
| 2026-06-18 | N739TU | - | Jun 18, 02:45 UTC | Jun 18, 03:15 UTC | 30m |
| 2026-06-16 | N739TU | - | Jun 16, 16:15 UTC | Jun 16, 16:50 UTC | 35m |
| 2026-06-16 | N739TU | - | Jun 16, 15:20 UTC | Jun 16, 15:45 UTC | 25m |
| 2026-06-14 | N739TU | FXE → FXE | Jun 14, 17:25 UTC | Jun 14, 18:45 UTC | 1h 20m |
| 2026-06-12 | N739TU | - | Jun 12, 15:05 UTC | Jun 12, 16:05 UTC | 1h 0m |
| 2026-06-06 | N739TU | - | Jun 6, 19:40 UTC | Jun 6, 20:00 UTC | 20m |
| 2026-06-05 | N739TU | - | Jun 5, 15:00 UTC | Jun 5, 15:30 UTC | 30m |
| 2026-06-02 | N739TU | - | Jun 2, 00:40 UTC | Jun 2, 01:10 UTC | 30m |
| 2026-05-24 | N739TU | - | May 24, 15:50 UTC | May 24, 16:50 UTC | 1h 0m |
| 2026-05-22 | N739TU | - | May 22, 22:15 UTC | May 22, 22:30 UTC | 15m |
| 2026-05-22 | N739TU | - | May 22, 21:10 UTC | May 22, 21:30 UTC | 20m |
| 2026-05-20 | N739TU | FXE → FXE | May 20, 15:25 UTC | May 20, 16:05 UTC | 40m |
| 2026-05-20 | N739TU | - | May 20, 13:15 UTC | May 20, 13:30 UTC | 15m |
| 2026-05-20 | N739TU | - | May 20, 11:55 UTC | May 20, 12:15 UTC | 20m |
| 2026-05-15 | N739TU | - | May 15, 18:15 UTC | May 15, 18:25 UTC | 10m |
| 2026-05-15 | N739TU | - | May 15, 16:30 UTC | May 15, 17:40 UTC | 1h 10m |
| 2026-05-15 | N739TU | - | May 15, 13:10 UTC | May 15, 15:15 UTC | 2h 4m |
| 2026-05-13 | N739TU | - | May 13, 13:40 UTC | May 13, 14:00 UTC | 20m |
| 2026-05-13 | N739TU | - | May 13, 12:50 UTC | May 13, 13:05 UTC | 15m |
| 2026-05-08 | N739TU | PPM → FXE | May 8, 21:05 UTC | May 8, 21:15 UTC | 10m |
| 2026-05-08 | N739TU | - | May 8, 13:45 UTC | May 8, 14:35 UTC | 50m |
| 2026-05-08 | N739TU | - | May 8, 10:54 UTC | May 8, 11:40 UTC | 45m |
| 2026-04-30 | N739TU | - | Apr 30, 17:45 UTC | Apr 30, 18:55 UTC | 1h 10m |
| 2026-04-30 | N739TU | - | Apr 30, 14:20 UTC | Apr 30, 14:50 UTC | 30m |
| 2026-04-28 | N739TU | - | Apr 28, 01:10 UTC | Apr 28, 01:50 UTC | 40m |
| 2026-04-27 | N739TU | - | Apr 27, 15:35 UTC | Apr 27, 15:45 UTC | 10m |
| 2026-04-26 | N739TU | - | Apr 26, 21:00 UTC | Apr 26, 21:30 UTC | 30m |
| 2026-04-26 | N739TU | - | Apr 26, 18:55 UTC | Apr 26, 19:50 UTC | 55m |
| 2026-04-26 | N739TU | - | Apr 26, 15:05 UTC | Apr 26, 16:00 UTC | 55m |
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 N739TU page for operator, model, and routing details .