sensors Mode-S transponder
A9D1A0
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N73134 · operated by HARBORSIDE AVIATION SERVICES INC
- Hex
- A9D1A0
- Octal
- 52350640
- Decimal
- 11,129,248
- Country
- US
- Tail
- N73134
- Type
- C172
- Flights observed
- 41
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 23, 00:30 UTC
Last known position
Country allocation
The ICAO 24-bit address A9D1A0 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 |
|---|---|---|---|
| N73134 | - | 41 | 2026-07-22 |
Recent flights last 41
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-22 | N73134 | - | Jul 22, 23:50 UTC | Jul 23, 00:30 UTC | 40m |
| 2026-07-22 | N73134 | - | Jul 22, 22:45 UTC | Jul 22, 23:10 UTC | 25m |
| 2026-07-21 | N73134 | - | Jul 21, 23:25 UTC | Jul 22, 00:50 UTC | 1h 25m |
| 2026-07-19 | N73134 | - | Jul 19, 01:40 UTC | Jul 19, 02:40 UTC | 1h 0m |
| 2026-07-18 | N73134 | - | Jul 18, 17:00 UTC | Jul 18, 18:20 UTC | 1h 20m |
| 2026-07-17 | N73134 | - | Jul 17, 14:50 UTC | Jul 17, 15:55 UTC | 1h 5m |
| 2026-07-15 | N73134 | - | Jul 15, 23:35 UTC | Jul 16, 00:15 UTC | 40m |
| 2026-06-25 | N73134 | - | Jun 25, 14:24 UTC | Jun 25, 15:10 UTC | 45m |
| 2026-06-22 | N73134 | - | Jun 22, 14:14 UTC | Jun 22, 14:29 UTC | 15m |
| 2026-06-21 | N73134 | - | Jun 21, 11:10 UTC | Jun 21, 12:55 UTC | 1h 45m |
| 2026-06-18 | N73134 | - | Jun 18, 15:10 UTC | Jun 18, 15:20 UTC | 10m |
| 2026-06-18 | N73134 | - | Jun 18, 12:10 UTC | Jun 18, 13:40 UTC | 1h 30m |
| 2026-06-11 | N73134 | - | Jun 11, 15:05 UTC | Jun 11, 16:10 UTC | 1h 5m |
| 2026-06-08 | N73134 | - | Jun 8, 20:00 UTC | Jun 8, 20:20 UTC | 20m |
| 2026-06-01 | N73134 | - | Jun 1, 12:35 UTC | Jun 1, 13:35 UTC | 1h 0m |
| 2026-05-24 | N73134 | - | May 24, 16:00 UTC | May 24, 17:30 UTC | 1h 30m |
| 2026-05-15 | N73134 | - | May 15, 16:25 UTC | May 15, 17:50 UTC | 1h 25m |
| 2026-05-15 | N73134 | - | May 15, 12:50 UTC | May 15, 13:30 UTC | 40m |
| 2026-05-09 | N73134 | - | May 9, 13:25 UTC | May 9, 14:40 UTC | 1h 15m |
| 2026-05-07 | N73134 | - | May 7, 13:10 UTC | May 7, 14:00 UTC | 50m |
| 2026-05-07 | N73134 | - | May 7, 12:05 UTC | May 7, 12:30 UTC | 25m |
| 2026-05-06 | N73134 | - | May 6, 23:05 UTC | May 7, 00:15 UTC | 1h 10m |
| 2026-05-04 | N73134 | - | May 4, 12:45 UTC | May 4, 13:55 UTC | 1h 10m |
| 2026-04-29 | N73134 | - | Apr 29, 11:55 UTC | Apr 29, 12:55 UTC | 1h 0m |
| 2026-04-28 | N73134 | - | Apr 28, 22:55 UTC | Apr 28, 23:05 UTC | 10m |
| 2026-04-25 | N73134 | - | Apr 25, 18:25 UTC | Apr 25, 19:00 UTC | 35m |
| 2026-04-25 | N73134 | - | Apr 25, 11:40 UTC | Apr 25, 12:40 UTC | 1h 0m |
| 2026-04-25 | N73134 | - | Apr 25, 00:10 UTC | Apr 25, 00:20 UTC | 10m |
| 2026-04-23 | N73134 | - | Apr 23, 19:25 UTC | Apr 23, 19:35 UTC | 10m |
| 2026-04-23 | N73134 | - | Apr 23, 15:10 UTC | Apr 23, 15:30 UTC | 20m |
| 2026-04-23 | N73134 | - | Apr 23, 12:01 UTC | Apr 23, 13:05 UTC | 1h 5m |
| 2026-04-17 | N73134 | - | Apr 17, 16:00 UTC | Apr 17, 16:45 UTC | 45m |
| 2026-04-16 | N73134 | - | Apr 16, 18:15 UTC | Apr 16, 18:50 UTC | 35m |
| 2026-04-15 | N73134 | - | Apr 15, 22:20 UTC | Apr 15, 23:00 UTC | 40m |
| 2026-04-15 | N73134 | - | Apr 15, 11:00 UTC | Apr 15, 11:55 UTC | 55m |
| 2026-04-14 | N73134 | - | Apr 14, 23:10 UTC | Apr 15, 00:35 UTC | 1h 25m |
| 2026-04-14 | N73134 | - | Apr 14, 18:55 UTC | Apr 14, 19:15 UTC | 20m |
| 2026-04-14 | N73134 | - | Apr 14, 18:35 UTC | Apr 14, 18:45 UTC | 10m |
| 2026-04-13 | N73134 | - | Apr 13, 16:15 UTC | Apr 13, 17:00 UTC | 45m |
| 2026-04-13 | N73134 | - | Apr 13, 15:50 UTC | Apr 13, 16:15 UTC | 25m |
| 2026-04-12 | N73134 | - | Apr 12, 17:15 UTC | Apr 12, 18:00 UTC | 45m |
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 N73134 page for operator, model, and routing details .