sensors Mode-S transponder
A5489C
ICAO 24-bit transponder address · allocated to United States
- Hex
- A5489C
- Octal
- 51244234
- Decimal
- 10,832,028
- Country
- US
- Flights observed
- 35
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 29d ago
Last known position
Country allocation
The ICAO 24-bit address A5489C 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 |
|---|---|---|---|
| N44DN | - | 35 | 2026-07-26 |
Recent flights last 35
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | N44DN | - | Jul 26, 22:40 UTC | Jul 26, 23:00 UTC | 20m |
| 2026-07-26 | N44DN | - | Jul 26, 16:35 UTC | Jul 26, 21:35 UTC | 5h 0m |
| 2026-07-26 | N44DN | - | Jul 26, 11:35 UTC | Jul 26, 16:00 UTC | 4h 25m |
| 2026-07-25 | N44DN | - | Jul 25, 13:15 UTC | Jul 25, 14:10 UTC | 55m |
| 2026-07-25 | N44DN | - | Jul 25, 07:40 UTC | Jul 25, 09:40 UTC | 2h 0m |
| 2026-07-25 | N44DN | - | Jul 25, 05:15 UTC | Jul 25, 06:20 UTC | 1h 5m |
| 2026-07-20 | N44DN | ATH → DBV | Jul 20, 13:00 UTC | Jul 20, 14:05 UTC | 1h 5m |
| 2026-07-20 | N44DN | TEB → ATH | Jul 20, 01:15 UTC | Jul 20, 11:50 UTC | 10h 35m |
| 2026-07-13 | N44DN | - | Jul 13, 18:45 UTC | Jul 13, 21:10 UTC | 2h 25m |
| 2026-07-08 | N44DN | - | Jul 8, 17:05 UTC | Jul 8, 17:30 UTC | 25m |
| 2026-07-08 | N44DN | - | Jul 8, 14:50 UTC | Jul 8, 15:10 UTC | 20m |
| 2026-07-01 | N44DN | - | Jul 1, 16:25 UTC | Jul 1, 19:05 UTC | 2h 40m |
| 2026-06-22 | N44DN | - | Jun 22, 21:40 UTC | Jun 23, 01:15 UTC | 3h 35m |
| 2026-06-19 | N44DN | - | Jun 19, 17:09 UTC | Jun 19, 21:39 UTC | 4h 30m |
| 2026-06-11 | N44DN | - | Jun 11, 22:00 UTC | Jun 12, 01:25 UTC | 3h 25m |
| 2026-06-08 | N44DN | - | Jun 8, 19:20 UTC | Jun 8, 23:05 UTC | 3h 45m |
| 2026-06-04 | N44DN | - | Jun 4, 23:50 UTC | Jun 5, 01:15 UTC | 1h 25m |
| 2026-06-01 | N44DN | - | Jun 1, 17:10 UTC | Jun 1, 17:35 UTC | 25m |
| 2026-05-22 | N44DN | - | May 22, 20:30 UTC | May 22, 23:05 UTC | 2h 35m |
| 2026-05-17 | N44DN | - | May 17, 20:45 UTC | May 17, 23:55 UTC | 3h 10m |
| 2026-05-14 | N44DN | - | May 14, 23:30 UTC | May 15, 00:55 UTC | 1h 25m |
| 2026-05-14 | N44DN | - | May 14, 20:05 UTC | May 14, 21:45 UTC | 1h 40m |
| 2026-05-11 | N44DN | - | May 11, 19:45 UTC | May 11, 20:10 UTC | 25m |
| 2026-05-09 | N44DN | - | May 9, 20:20 UTC | May 9, 21:19 UTC | 1h 0m |
| 2026-05-06 | N44DN | - | May 6, 21:20 UTC | May 7, 03:10 UTC | 5h 50m |
| 2026-05-05 | N44DN | - | May 5, 20:35 UTC | May 5, 23:30 UTC | 2h 55m |
| 2026-04-29 | N44DN | - | Apr 29, 22:00 UTC | Apr 30, 00:25 UTC | 2h 24m |
| 2026-04-27 | N44DN | - | Apr 27, 20:55 UTC | Apr 27, 21:55 UTC | 1h 0m |
| 2026-04-27 | N44DN | - | Apr 27, 17:30 UTC | Apr 27, 20:15 UTC | 2h 45m |
| 2026-04-20 | N44DN | - | Apr 20, 21:50 UTC | Apr 21, 00:20 UTC | 2h 30m |
| 2026-04-19 | N44DN | - | Apr 19, 18:40 UTC | Apr 19, 22:50 UTC | 4h 10m |
| 2026-04-13 | N44DN | - | Apr 13, 19:50 UTC | Apr 13, 20:35 UTC | 45m |
| 2026-04-13 | N44DN | - | Apr 13, 16:15 UTC | Apr 13, 20:10 UTC | 3h 55m |
| 2026-04-13 | N44DN | - | Apr 13, 15:50 UTC | Apr 13, 19:45 UTC | 3h 55m |
| 2026-04-13 | N44DN | - | Apr 13, 15:10 UTC | Apr 13, 16:15 UTC | 1h 5m |
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.