sensors Mode-S transponder
A98AC8
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N7139C · PIPER PA-31-300/310/325/350/425 · operated by GV AIR INC
- Hex
- A98AC8
- Octal
- 52305310
- Decimal
- 11,111,112
- Country
- US
- Tail
- N7139C
- Type
- PA31
- Flights observed
- 19
- Distinct callsigns
- 2
- Country
- US
- Last broadcast
- 16h ago
Last known position
Country allocation
The ICAO 24-bit address A98AC8 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 19
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | UNIDENT | - | Jul 13, 07:15 UTC | Jul 13, 18:15 UTC | 11h 0m |
| 2026-07-01 | UNIDENT | - | Jul 1, 18:30 UTC | Jul 1, 23:40 UTC | 5h 10m |
| 2026-06-29 | UNIDENT | - | Jun 29, 02:30 UTC | Jun 29, 18:30 UTC | 16h 0m |
| 2026-06-26 | UNIDENT | - | Jun 26, 21:59 UTC | Jun 27, 12:45 UTC | 14h 45m |
| 2026-06-20 | UNIDENT | - | Jun 20, 23:29 UTC | Jun 21, 12:24 UTC | 12h 55m |
| 2026-06-20 | UNIDENT | - | Jun 20, 22:20 UTC | Jun 20, 22:35 UTC | 15m |
| 2026-06-17 | UNIDENT | - | Jun 17, 23:20 UTC | Jun 18, 16:20 UTC | 17h 0m |
| 2026-06-14 | UNIDENT | - | Jun 14, 07:30 UTC | Jun 14, 20:25 UTC | 12h 55m |
| 2026-06-08 | UNIFENT | - | Jun 8, 05:00 UTC | Jun 8, 15:00 UTC | 10h 0m |
| 2026-06-06 | UNIFENT | - | Jun 6, 20:05 UTC | Jun 6, 20:30 UTC | 25m |
| 2026-05-31 | UNIFENT | - | May 31, 18:50 UTC | May 31, 19:00 UTC | 10m |
| 2026-05-30 | UNIFENT | - | May 30, 04:55 UTC | May 30, 17:00 UTC | 12h 5m |
| 2026-05-28 | UNIFENT | - | May 28, 12:15 UTC | May 28, 12:55 UTC | 40m |
| 2026-05-27 | UNIFENT | - | May 27, 00:49 UTC | May 27, 15:40 UTC | 14h 51m |
| 2026-05-25 | UNIFENT | - | May 25, 05:35 UTC | May 25, 21:15 UTC | 15h 40m |
| 2026-05-18 | UNIFENT | - | May 18, 20:25 UTC | May 18, 21:35 UTC | 1h 10m |
| 2026-05-16 | UNIFENT | - | May 16, 04:10 UTC | May 16, 16:10 UTC | 12h 1m |
| 2026-05-13 | UNIFENT | - | May 13, 07:35 UTC | May 13, 08:30 UTC | 55m |
| 2026-05-05 | UNIFENT | - | May 5, 05:15 UTC | May 5, 12:30 UTC | 7h 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 N7139C page for operator, model, and routing details .