sensors Mode-S transponder
A98AC6
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N7139A · CESSNA 172 Skyhawk · operated by TIMOTHY SCOTT BLOOM
- Hex
- A98AC6
- Octal
- 52305306
- Decimal
- 11,111,110
- Country
- US
- Tail
- N7139A
- Type
- C172
- Flights observed
- 18
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address A98AC6 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 |
|---|---|---|---|
| UNIDENT | - | 18 | 2026-07-12 |
Recent flights last 18
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-12 | UNIDENT | - | Jul 12, 20:10 UTC | Jul 13, 00:25 UTC | 4h 15m |
| 2026-07-09 | UNIDENT | - | Jul 9, 21:55 UTC | Jul 10, 06:20 UTC | 8h 25m |
| 2026-07-06 | UNIDENT | - | Jul 6, 05:35 UTC | Jul 7, 00:45 UTC | 19h 10m |
| 2026-07-06 | UNIDENT | - | Jul 6, 04:45 UTC | Jul 7, 00:45 UTC | 20h 0m |
| 2026-06-27 | UNIDENT | - | Jun 27, 14:00 UTC | Jun 28, 05:34 UTC | 15h 35m |
| 2026-06-24 | UNIDENT | - | Jun 24, 08:35 UTC | Jun 24, 20:05 UTC | 11h 30m |
| 2026-06-22 | UNIDENT | - | Jun 22, 05:15 UTC | Jun 22, 19:44 UTC | 14h 30m |
| 2026-06-21 | UNIDENT | - | Jun 21, 04:20 UTC | Jun 21, 05:35 UTC | 1h 15m |
| 2026-06-20 | UNIDENT | - | Jun 20, 23:29 UTC | Jun 21, 03:00 UTC | 3h 30m |
| 2026-06-20 | UNIDENT | - | Jun 20, 10:49 UTC | Jun 20, 22:35 UTC | 11h 45m |
| 2026-06-17 | UNIDENT | - | Jun 17, 21:50 UTC | Jun 18, 16:40 UTC | 18h 50m |
| 2026-06-08 | UNIDENT | - | Jun 8, 22:35 UTC | Jun 8, 22:55 UTC | 20m |
| 2026-05-31 | UNIDENT | - | May 31, 19:50 UTC | Jun 1, 13:15 UTC | 17h 25m |
| 2026-05-28 | UNIDENT | - | May 28, 14:45 UTC | May 28, 23:35 UTC | 8h 50m |
| 2026-05-25 | UNIDENT | - | May 25, 17:35 UTC | May 25, 22:15 UTC | 4h 40m |
| 2026-05-21 | UNIDENT | - | May 21, 08:15 UTC | May 21, 18:30 UTC | 10h 15m |
| 2026-05-06 | UNIDENT | - | May 6, 05:55 UTC | May 6, 20:25 UTC | 14h 30m |
| 2026-05-03 | UNIDENT | - | May 3, 20:05 UTC | May 4, 09:00 UTC | 12h 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 N7139A page for operator, model, and routing details .