sensors Mode-S transponder
A89E6A
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N6543U · MOONEY M-20 · operated by GIESEY WILLIAM
- Hex
- A89E6A
- Octal
- 52117152
- Decimal
- 11,050,602
- Country
- US
- Tail
- N6543U
- Type
- M20P
- Flights observed
- 35
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 4d ago
Last known position
Country allocation
The ICAO 24-bit address A89E6A 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 |
|---|---|---|---|
| N6543U | - | 35 | 2026-07-25 |
Recent flights last 35
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | N6543U | - | Jul 25, 16:10 UTC | Jul 25, 17:40 UTC | 1h 30m |
| 2026-07-23 | N6543U | EWB → PNE | Jul 23, 01:15 UTC | Jul 23, 03:10 UTC | 1h 55m |
| 2026-07-22 | N6543U | - | Jul 22, 18:30 UTC | Jul 22, 20:05 UTC | 1h 35m |
| 2026-07-20 | N6543U | - | Jul 20, 01:00 UTC | Jul 20, 02:45 UTC | 1h 45m |
| 2026-07-16 | N6543U | - | Jul 16, 15:14 UTC | Jul 16, 17:54 UTC | 2h 40m |
| 2026-07-15 | N6543U | - | Jul 15, 02:25 UTC | Jul 15, 03:50 UTC | 1h 25m |
| 2026-07-14 | N6543U | - | Jul 14, 12:10 UTC | Jul 14, 13:35 UTC | 1h 25m |
| 2026-07-10 | N6543U | - | Jul 10, 23:05 UTC | Jul 11, 00:35 UTC | 1h 30m |
| 2026-07-09 | N6543U | - | Jul 9, 19:00 UTC | Jul 9, 20:35 UTC | 1h 35m |
| 2026-06-28 | N6543U | - | Jun 28, 13:40 UTC | Jun 28, 15:55 UTC | 2h 15m |
| 2026-06-27 | N6543U | - | Jun 27, 17:49 UTC | Jun 27, 20:55 UTC | 3h 5m |
| 2026-06-26 | N6543U | - | Jun 26, 21:20 UTC | Jun 26, 23:04 UTC | 1h 45m |
| 2026-06-26 | N6543U | - | Jun 26, 13:40 UTC | Jun 26, 15:25 UTC | 1h 45m |
| 2026-06-17 | N6543U | - | Jun 17, 15:30 UTC | Jun 17, 15:55 UTC | 25m |
| 2026-06-16 | N6543U | - | Jun 16, 19:40 UTC | Jun 16, 20:10 UTC | 31m |
| 2026-06-16 | N6543U | - | Jun 16, 01:50 UTC | Jun 16, 03:30 UTC | 1h 40m |
| 2026-06-15 | N6543U | - | Jun 15, 19:35 UTC | Jun 15, 20:59 UTC | 1h 25m |
| 2026-06-12 | N6543U | - | Jun 12, 14:20 UTC | Jun 12, 15:15 UTC | 55m |
| 2026-06-08 | N6543U | - | Jun 8, 23:00 UTC | Jun 9, 01:20 UTC | 2h 20m |
| 2026-06-08 | N6543U | - | Jun 8, 15:45 UTC | Jun 8, 17:25 UTC | 1h 40m |
| 2026-06-04 | N6543U | - | Jun 4, 11:35 UTC | Jun 4, 13:05 UTC | 1h 30m |
| 2026-06-02 | N6543U | - | Jun 2, 17:40 UTC | Jun 2, 19:15 UTC | 1h 35m |
| 2026-05-31 | N6543U | - | May 31, 16:05 UTC | May 31, 17:30 UTC | 1h 25m |
| 2026-05-29 | N6543U | - | May 29, 17:45 UTC | May 29, 19:05 UTC | 1h 20m |
| 2026-05-27 | N6543U | - | May 27, 14:30 UTC | May 27, 15:05 UTC | 35m |
| 2026-05-21 | N6543U | EWB → PNE | May 21, 11:30 UTC | May 21, 13:05 UTC | 1h 35m |
| 2026-05-19 | N6543U | PNE → EWB | May 19, 18:35 UTC | May 19, 19:55 UTC | 1h 20m |
| 2026-05-10 | N6543U | GED → PNE | May 10, 14:59 UTC | May 10, 15:45 UTC | 45m |
| 2026-05-10 | N6543U | - | May 10, 12:40 UTC | May 10, 14:09 UTC | 1h 30m |
| 2026-05-08 | N6543U | - | May 8, 14:45 UTC | May 8, 16:55 UTC | 2h 10m |
| 2026-05-06 | N6543U | EWB → PNE | May 6, 15:10 UTC | May 6, 17:25 UTC | 2h 15m |
| 2026-05-04 | N6543U | LDJ → EWB | May 4, 19:45 UTC | May 4, 21:00 UTC | 1h 15m |
| 2026-05-04 | N6543U | - | May 4, 17:25 UTC | May 4, 18:35 UTC | 1h 11m |
| 2026-05-03 | N6543U | - | May 3, 13:55 UTC | May 3, 15:25 UTC | 1h 30m |
| 2026-04-29 | N6543U | - | Apr 29, 12:50 UTC | Apr 29, 13:25 UTC | 35m |
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 N6543U page for operator, model, and routing details .