sensors Mode-S transponder
A12457
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N173AE · operated by ARCO AIR LLC
- Hex
- A12457
- Octal
- 50222127
- Decimal
- 10,560,599
- Country
- US
- Tail
- N173AE
- Type
- SF50
- Flights observed
- 33
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 9d ago
Last known position
Country allocation
The ICAO 24-bit address A12457 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 |
|---|---|---|---|
| N173AE | - | 33 | 2026-07-23 |
Recent flights last 33
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-23 | N173AE | - | Jul 23, 12:40 UTC | Jul 23, 14:15 UTC | 1h 35m |
| 2026-07-19 | N173AE | - | Jul 19, 19:45 UTC | Jul 19, 22:10 UTC | 2h 25m |
| 2026-06-28 | N173AE | - | Jun 28, 18:55 UTC | Jun 28, 20:34 UTC | 1h 40m |
| 2026-06-25 | N173AE | - | Jun 25, 16:05 UTC | Jun 25, 17:49 UTC | 1h 45m |
| 2026-06-15 | N173AE | - | Jun 15, 15:45 UTC | Jun 15, 19:00 UTC | 3h 15m |
| 2026-06-10 | N173AE | - | Jun 10, 19:45 UTC | Jun 10, 21:35 UTC | 1h 50m |
| 2026-06-10 | N173AE | - | Jun 10, 15:45 UTC | Jun 10, 18:50 UTC | 3h 5m |
| 2026-06-08 | N173AE | - | Jun 8, 23:30 UTC | Jun 9, 01:25 UTC | 1h 55m |
| 2026-06-08 | N173AE | RKV → BGR | Jun 8, 14:30 UTC | Jun 8, 22:50 UTC | 8h 20m |
| 2026-06-08 | N173AE | - | Jun 8, 13:25 UTC | Jun 8, 13:45 UTC | 20m |
| 2026-06-08 | N173AE | - | Jun 8, 09:30 UTC | Jun 8, 10:55 UTC | 1h 25m |
| 2026-06-08 | N173AE | - | Jun 8, 07:50 UTC | Jun 8, 08:30 UTC | 40m |
| 2026-06-07 | N173AE | - | Jun 7, 08:20 UTC | Jun 7, 10:10 UTC | 1h 50m |
| 2026-06-06 | N173AE | - | Jun 6, 08:15 UTC | Jun 6, 10:39 UTC | 2h 25m |
| 2026-06-05 | N173AE | - | Jun 5, 09:40 UTC | Jun 5, 11:15 UTC | 1h 35m |
| 2026-06-04 | N173AE | - | Jun 4, 15:05 UTC | Jun 4, 16:00 UTC | 55m |
| 2026-06-04 | N173AE | PRG → VIE | Jun 4, 08:50 UTC | Jun 4, 09:45 UTC | 55m |
| 2026-06-03 | N173AE | - | Jun 3, 09:35 UTC | Jun 3, 11:10 UTC | 1h 35m |
| 2026-06-03 | N173AE | - | Jun 3, 06:55 UTC | Jun 3, 08:20 UTC | 1h 25m |
| 2026-06-01 | N173AE | - | Jun 1, 12:35 UTC | Jun 1, 14:25 UTC | 1h 50m |
| 2026-05-30 | N173AE | - | May 30, 07:45 UTC | May 30, 09:45 UTC | 2h 0m |
| 2026-05-29 | N173AE | - | May 29, 13:25 UTC | May 29, 15:10 UTC | 1h 45m |
| 2026-05-29 | N173AE | - | May 29, 07:35 UTC | May 29, 08:05 UTC | 30m |
| 2026-05-27 | N173AE | - | May 27, 13:25 UTC | May 27, 14:45 UTC | 1h 20m |
| 2026-05-27 | N173AE | - | May 27, 10:10 UTC | May 27, 10:35 UTC | 25m |
| 2026-05-26 | N173AE | - | May 26, 12:24 UTC | May 26, 12:45 UTC | 20m |
| 2026-05-25 | N173AE | - | May 25, 15:50 UTC | May 26, 12:45 UTC | 20h 55m |
| 2026-05-25 | N173AE | - | May 25, 15:00 UTC | May 26, 12:45 UTC | 21h 44m |
| 2026-05-20 | N173AE | - | May 20, 12:30 UTC | May 20, 13:15 UTC | 45m |
| 2026-05-18 | N173AE | - | May 18, 17:45 UTC | May 18, 18:20 UTC | 35m |
| 2026-05-04 | N173AE | - | May 4, 21:00 UTC | May 4, 21:35 UTC | 35m |
| 2026-05-04 | N173AE | - | May 4, 15:25 UTC | May 4, 16:00 UTC | 35m |
| 2026-04-12 | N173AE | - | Apr 12, 17:15 UTC | Apr 12, 19:40 UTC | 2h 25m |
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 N173AE page for operator, model, and routing details .