sensors Mode-S transponder
AB5D25
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N831MA · CESSNA 172 Skyhawk · operated by STATE OF WISCONSIN, DEPARTMENT OF ADMINISTRATION, WISCONSIN AIR SERVICES
- Hex
- AB5D25
- Octal
- 52656445
- Decimal
- 11,230,501
- Country
- US
- Tail
- N831MA
- Type
- C172
- Flights observed
- 36
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 18d ago
Last known position
Country allocation
The ICAO 24-bit address AB5D25 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 |
|---|---|---|---|
| N831MA | - | 36 | 2026-07-15 |
Recent flights last 36
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-15 | N831MA | - | Jul 15, 20:20 UTC | Jul 15, 21:25 UTC | 1h 5m |
| 2026-07-15 | N831MA | - | Jul 15, 14:50 UTC | Jul 15, 19:15 UTC | 4h 25m |
| 2026-07-13 | N831MA | - | Jul 13, 21:10 UTC | Jul 13, 22:15 UTC | 1h 5m |
| 2026-07-13 | N831MA | - | Jul 13, 16:40 UTC | Jul 13, 17:00 UTC | 20m |
| 2026-07-13 | N831MA | - | Jul 13, 14:20 UTC | Jul 13, 16:05 UTC | 1h 45m |
| 2026-07-10 | N831MA | - | Jul 10, 20:30 UTC | Jul 10, 21:05 UTC | 36m |
| 2026-07-10 | N831MA | - | Jul 10, 18:10 UTC | Jul 10, 19:45 UTC | 1h 35m |
| 2026-07-10 | N831MA | - | Jul 10, 14:40 UTC | Jul 10, 16:45 UTC | 2h 5m |
| 2026-07-10 | N831MA | - | Jul 10, 13:20 UTC | Jul 10, 13:55 UTC | 35m |
| 2026-07-09 | N831MA | - | Jul 9, 18:20 UTC | Jul 9, 19:20 UTC | 1h 0m |
| 2026-07-08 | N831MA | - | Jul 8, 18:00 UTC | Jul 8, 19:20 UTC | 1h 20m |
| 2026-07-07 | N831MA | - | Jul 7, 14:00 UTC | Jul 7, 16:50 UTC | 2h 50m |
| 2026-06-27 | N831MA | - | Jun 27, 19:19 UTC | Jun 27, 19:49 UTC | 30m |
| 2026-06-27 | N831MA | - | Jun 27, 14:14 UTC | Jun 27, 14:45 UTC | 30m |
| 2026-06-19 | N831MA | - | Jun 19, 02:14 UTC | Jun 19, 02:59 UTC | 45m |
| 2026-06-18 | N831MA | - | Jun 18, 20:05 UTC | Jun 19, 01:15 UTC | 5h 9m |
| 2026-06-15 | N831MA | - | Jun 15, 16:04 UTC | Jun 15, 17:40 UTC | 1h 35m |
| 2026-06-12 | N831MA | CWA → MSN | Jun 12, 20:25 UTC | Jun 12, 21:30 UTC | 1h 5m |
| 2026-06-12 | N831MA | - | Jun 12, 14:01 UTC | Jun 12, 19:20 UTC | 5h 20m |
| 2026-06-02 | N831MA | - | Jun 2, 20:45 UTC | Jun 3, 01:05 UTC | 4h 20m |
| 2026-05-28 | N831MA | - | May 28, 20:20 UTC | May 28, 21:10 UTC | 50m |
| 2026-05-28 | N831MA | - | May 28, 14:15 UTC | May 28, 19:45 UTC | 5h 30m |
| 2026-05-27 | N831MA | - | May 27, 01:09 UTC | May 27, 01:44 UTC | 35m |
| 2026-05-26 | N831MA | - | May 26, 19:30 UTC | May 26, 20:00 UTC | 30m |
| 2026-05-18 | N831MA | MSN → MSN | May 18, 20:40 UTC | May 19, 00:50 UTC | 4h 10m |
| 2026-05-13 | N831MA | - | May 13, 20:45 UTC | May 13, 21:30 UTC | 45m |
| 2026-05-13 | N831MA | - | May 13, 14:55 UTC | May 13, 19:30 UTC | 4h 35m |
| 2026-05-11 | N831MA | - | May 11, 14:35 UTC | May 11, 18:40 UTC | 4h 6m |
| 2026-05-07 | N831MA | - | May 7, 19:35 UTC | May 7, 19:55 UTC | 20m |
| 2026-05-07 | N831MA | - | May 7, 19:00 UTC | May 7, 19:30 UTC | 30m |
| 2026-04-29 | N831MA | - | Apr 29, 17:01 UTC | Apr 29, 17:20 UTC | 20m |
| 2026-04-29 | N831MA | - | Apr 29, 14:55 UTC | Apr 29, 16:10 UTC | 1h 15m |
| 2026-04-28 | N831MA | - | Apr 28, 15:50 UTC | Apr 28, 18:10 UTC | 2h 20m |
| 2026-04-22 | N831MA | - | Apr 22, 20:00 UTC | Apr 22, 20:30 UTC | 30m |
| 2026-04-22 | N831MA | - | Apr 22, 14:30 UTC | Apr 22, 19:25 UTC | 4h 55m |
| 2026-04-20 | N831MA | - | Apr 20, 17:35 UTC | Apr 20, 20:30 UTC | 2h 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 N831MA page for operator, model, and routing details .