sensors Mode-S transponder
A98AC9
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N7139D · CESSNA T182 Turbo Skylane · operated by BENJAMIN RALPH L
- Hex
- A98AC9
- Octal
- 52305311
- Decimal
- 11,111,113
- Country
- US
- Tail
- N7139D
- Type
- C82S
- Flights observed
- 36
- Distinct callsigns
- 2
- Country
- US
- Last broadcast
- 18h ago
Last known position
Country allocation
The ICAO 24-bit address A98AC9 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 2 distinct
Recent flights last 36
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | N7139D | - | Jul 13, 16:05 UTC | Jul 13, 16:40 UTC | 35m |
| 2026-07-11 | N7139D | - | Jul 11, 15:55 UTC | Jul 11, 17:25 UTC | 1h 30m |
| 2026-07-10 | N7139D | - | Jul 10, 19:30 UTC | Jul 10, 20:05 UTC | 35m |
| 2026-07-10 | N7139D | - | Jul 10, 18:05 UTC | Jul 10, 18:30 UTC | 25m |
| 2026-07-09 | N7139D | - | Jul 9, 19:25 UTC | Jul 9, 19:45 UTC | 20m |
| 2026-07-09 | N7139D | - | Jul 9, 18:20 UTC | Jul 9, 18:50 UTC | 30m |
| 2026-07-07 | N7139D | - | Jul 7, 16:45 UTC | Jul 7, 18:25 UTC | 1h 40m |
| 2026-07-04 | UNIDENT | - | Jul 4, 22:15 UTC | Jul 5, 06:30 UTC | 8h 15m |
| 2026-07-02 | UNIDENT | - | Jul 2, 20:50 UTC | Jul 3, 13:10 UTC | 16h 20m |
| 2026-06-30 | N7139D | - | Jun 30, 19:40 UTC | Jun 30, 20:20 UTC | 40m |
| 2026-06-29 | UNIDENT | - | Jun 29, 05:50 UTC | Jun 29, 20:19 UTC | 14h 30m |
| 2026-06-27 | N7139D | - | Jun 27, 19:19 UTC | Jun 27, 19:39 UTC | 20m |
| 2026-06-27 | N7139D | - | Jun 27, 18:09 UTC | Jun 27, 18:49 UTC | 40m |
| 2026-06-26 | UNIDENT | - | Jun 26, 04:20 UTC | Jun 26, 20:20 UTC | 16h 0m |
| 2026-06-23 | UNIDENT | - | Jun 23, 07:49 UTC | Jun 23, 17:44 UTC | 9h 55m |
| 2026-06-20 | UNIDENT | - | Jun 20, 09:24 UTC | Jun 20, 21:30 UTC | 12h 5m |
| 2026-06-19 | N7139D | - | Jun 19, 15:34 UTC | Jun 19, 16:55 UTC | 1h 20m |
| 2026-06-18 | N7139D | - | Jun 18, 17:40 UTC | Jun 18, 19:00 UTC | 1h 20m |
| 2026-06-18 | N7139D | - | Jun 18, 15:10 UTC | Jun 18, 16:35 UTC | 1h 25m |
| 2026-06-16 | N7139D | - | Jun 16, 15:05 UTC | Jun 16, 16:30 UTC | 1h 25m |
| 2026-06-15 | UNIDENT | - | Jun 15, 18:25 UTC | Jun 15, 19:50 UTC | 1h 25m |
| 2026-06-15 | N7139D | - | Jun 15, 14:50 UTC | Jun 15, 16:45 UTC | 1h 55m |
| 2026-04-26 | N7139D | - | Apr 26, 18:50 UTC | Apr 26, 20:10 UTC | 1h 20m |
| 2026-04-26 | N7139D | - | Apr 26, 16:05 UTC | Apr 26, 17:20 UTC | 1h 15m |
| 2026-04-23 | N7139D | - | Apr 23, 15:35 UTC | Apr 23, 16:50 UTC | 1h 15m |
| 2026-04-17 | N7139D | - | Apr 17, 16:00 UTC | Apr 17, 16:20 UTC | 20m |
| 2026-04-17 | N7139D | - | Apr 17, 15:20 UTC | Apr 17, 15:30 UTC | 10m |
| 2026-04-17 | N7139D | - | Apr 17, 15:05 UTC | Apr 17, 15:15 UTC | 10m |
| 2026-04-16 | N7139D | - | Apr 16, 21:14 UTC | Apr 16, 21:24 UTC | 10m |
| 2026-04-16 | N7139D | - | Apr 16, 19:15 UTC | Apr 16, 21:10 UTC | 1h 55m |
| 2026-04-16 | N7139D | - | Apr 16, 16:35 UTC | Apr 16, 17:10 UTC | 35m |
| 2026-04-16 | N7139D | - | Apr 16, 15:15 UTC | Apr 16, 16:05 UTC | 50m |
| 2026-04-16 | N7139D | - | Apr 16, 13:15 UTC | Apr 16, 15:10 UTC | 1h 55m |
| 2026-04-16 | N7139D | - | Apr 16, 12:24 UTC | Apr 16, 13:05 UTC | 40m |
| 2026-04-12 | N7139D | - | Apr 12, 19:25 UTC | Apr 12, 20:15 UTC | 50m |
| 2026-04-12 | N7139D | - | Apr 12, 17:15 UTC | Apr 12, 18:15 UTC | 1h 0m |
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 N7139D page for operator, model, and routing details .