sensors Mode-S transponder
A489FC
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N3918M · PIPER PA-28-140/150/160/180 · operated by ASTRO AVIATION LLC
- Hex
- A489FC
- Octal
- 51104774
- Decimal
- 10,783,228
- Country
- US
- Tail
- N3918M
- Type
- P28A
- Flights observed
- 34
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 17, 00:25 UTC
Last known position
Country allocation
The ICAO 24-bit address A489FC 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 |
|---|---|---|---|
| N3918M | - | 34 | 2026-07-16 |
Recent flights last 34
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-16 | N3918M | - | Jul 16, 23:35 UTC | Jul 17, 00:25 UTC | 50m |
| 2026-07-16 | N3918M | - | Jul 16, 14:05 UTC | Jul 16, 14:29 UTC | 25m |
| 2026-07-16 | N3918M | - | Jul 16, 13:15 UTC | Jul 16, 13:34 UTC | 20m |
| 2026-07-14 | N3918M | - | Jul 14, 23:40 UTC | Jul 15, 01:00 UTC | 1h 20m |
| 2026-07-14 | N3918M | - | Jul 14, 11:45 UTC | Jul 14, 13:00 UTC | 1h 15m |
| 2026-06-25 | N3918M | - | Jun 25, 21:44 UTC | Jun 25, 22:45 UTC | 1h 0m |
| 2026-06-23 | N3918M | - | Jun 23, 23:19 UTC | Jun 24, 00:30 UTC | 1h 10m |
| 2026-06-19 | N3918M | - | Jun 19, 23:29 UTC | Jun 20, 00:59 UTC | 1h 30m |
| 2026-06-17 | N3918M | - | Jun 17, 22:25 UTC | Jun 17, 22:50 UTC | 25m |
| 2026-06-11 | N3918M | - | Jun 11, 14:50 UTC | Jun 11, 15:20 UTC | 30m |
| 2026-06-05 | N3918M | - | Jun 5, 14:50 UTC | Jun 5, 15:20 UTC | 30m |
| 2026-06-04 | N3918M | - | Jun 4, 23:00 UTC | Jun 4, 23:45 UTC | 45m |
| 2026-06-04 | N3918M | - | Jun 4, 13:35 UTC | Jun 4, 14:20 UTC | 45m |
| 2026-06-03 | N3918M | - | Jun 3, 23:40 UTC | Jun 4, 00:50 UTC | 1h 10m |
| 2026-05-31 | N3918M | - | May 31, 00:25 UTC | May 31, 00:55 UTC | 30m |
| 2026-05-28 | N3918M | - | May 28, 23:35 UTC | May 28, 23:55 UTC | 20m |
| 2026-05-01 | N3918M | - | May 1, 13:50 UTC | May 1, 15:05 UTC | 1h 15m |
| 2026-05-01 | N3918M | BNA → BNA | May 1, 13:30 UTC | May 1, 13:35 UTC | 5m |
| 2026-04-23 | N3918M | - | Apr 23, 01:15 UTC | Apr 23, 02:35 UTC | 1h 20m |
| 2026-04-22 | N3918M | - | Apr 22, 21:35 UTC | Apr 22, 22:40 UTC | 1h 5m |
| 2026-04-21 | N3918M | - | Apr 21, 20:25 UTC | Apr 21, 22:15 UTC | 1h 50m |
| 2026-04-21 | N3918M | - | Apr 21, 17:50 UTC | Apr 21, 18:00 UTC | 10m |
| 2026-04-21 | N3918M | - | Apr 21, 12:45 UTC | Apr 21, 14:10 UTC | 1h 25m |
| 2026-04-21 | N3918M | BNA → BNA | Apr 21, 12:30 UTC | Apr 21, 12:35 UTC | 5m |
| 2026-04-20 | N3918M | BNA → BNA | Apr 20, 17:25 UTC | Apr 20, 18:35 UTC | 1h 10m |
| 2026-04-20 | N3918M | BNA → BNA | Apr 20, 13:45 UTC | Apr 20, 15:00 UTC | 1h 15m |
| 2026-04-20 | N3918M | BNA → BNA | Apr 20, 11:40 UTC | Apr 20, 13:00 UTC | 1h 20m |
| 2026-04-18 | N3918M | - | Apr 18, 14:45 UTC | Apr 18, 15:30 UTC | 45m |
| 2026-04-18 | N3918M | BNA → BNA | Apr 18, 14:30 UTC | Apr 18, 14:35 UTC | 5m |
| 2026-04-17 | N3918M | BNA → BNA | Apr 17, 23:40 UTC | Apr 18, 01:10 UTC | 1h 30m |
| 2026-04-17 | N3918M | - | Apr 17, 15:20 UTC | Apr 17, 16:40 UTC | 1h 20m |
| 2026-04-17 | N3918M | - | Apr 17, 15:05 UTC | Apr 17, 15:15 UTC | 10m |
| 2026-04-16 | N3918M | - | Apr 16, 23:20 UTC | Apr 16, 23:45 UTC | 25m |
| 2026-04-16 | N3918M | - | Apr 16, 22:15 UTC | Apr 16, 23:10 UTC | 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 N3918M page for operator, model, and routing details .