sensors Mode-S transponder
AA8A55
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N7789C · operated by CASADY JOSEPH P
- Hex
- AA8A55
- Octal
- 52505125
- Decimal
- 11,176,533
- Country
- US
- Tail
- N7789C
- Type
- PA18
- Flights observed
- 39
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 25, 02:50 UTC
Last known position
Country allocation
The ICAO 24-bit address AA8A55 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 |
|---|---|---|---|
| N7789C | - | 39 | 2026-07-25 |
Recent flights last 39
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | N7789C | - | Jul 25, 02:15 UTC | Jul 25, 02:50 UTC | 35m |
| 2026-07-24 | N7789C | - | Jul 24, 13:40 UTC | Jul 24, 13:50 UTC | 10m |
| 2026-07-21 | N7789C | - | Jul 21, 23:55 UTC | Jul 22, 00:10 UTC | 15m |
| 2026-07-18 | N7789C | - | Jul 18, 23:00 UTC | Jul 18, 23:10 UTC | 10m |
| 2026-07-18 | N7789C | - | Jul 18, 20:45 UTC | Jul 18, 21:00 UTC | 15m |
| 2026-07-18 | N7789C | - | Jul 18, 19:35 UTC | Jul 18, 19:50 UTC | 15m |
| 2026-07-12 | N7789C | - | Jul 12, 19:55 UTC | Jul 12, 20:10 UTC | 15m |
| 2026-07-12 | N7789C | - | Jul 12, 17:25 UTC | Jul 12, 17:40 UTC | 15m |
| 2026-07-12 | N7789C | - | Jul 12, 14:55 UTC | Jul 12, 15:30 UTC | 35m |
| 2026-07-11 | N7789C | - | Jul 11, 14:50 UTC | Jul 11, 15:10 UTC | 20m |
| 2026-07-10 | N7789C | - | Jul 10, 14:15 UTC | Jul 10, 14:30 UTC | 15m |
| 2026-07-07 | N7789C | - | Jul 7, 02:55 UTC | Jul 7, 03:30 UTC | 35m |
| 2026-07-01 | N7789C | - | Jul 1, 16:05 UTC | Jul 1, 16:20 UTC | 15m |
| 2026-07-01 | N7789C | - | Jul 1, 14:35 UTC | Jul 1, 14:50 UTC | 15m |
| 2026-06-25 | N7789C | - | Jun 25, 02:45 UTC | Jun 25, 03:04 UTC | 20m |
| 2026-06-23 | N7789C | - | Jun 23, 14:59 UTC | Jun 23, 15:40 UTC | 40m |
| 2026-06-19 | N7789C | - | Jun 19, 03:24 UTC | Jun 19, 03:55 UTC | 30m |
| 2026-06-19 | N7789C | - | Jun 19, 00:05 UTC | Jun 19, 00:45 UTC | 39m |
| 2026-06-18 | N7789C | - | Jun 18, 15:15 UTC | Jun 18, 15:40 UTC | 25m |
| 2026-06-15 | N7789C | - | Jun 15, 14:55 UTC | Jun 15, 15:19 UTC | 25m |
| 2026-06-13 | N7789C | - | Jun 13, 13:55 UTC | Jun 13, 14:20 UTC | 25m |
| 2026-06-11 | N7789C | - | Jun 11, 01:40 UTC | Jun 11, 01:55 UTC | 15m |
| 2026-06-07 | N7789C | - | Jun 7, 13:40 UTC | Jun 7, 14:05 UTC | 25m |
| 2026-06-03 | N7789C | - | Jun 3, 02:40 UTC | Jun 3, 02:50 UTC | 10m |
| 2026-06-03 | N7789C | - | Jun 3, 01:25 UTC | Jun 3, 01:35 UTC | 10m |
| 2026-06-02 | N7789C | - | Jun 2, 14:30 UTC | Jun 2, 14:40 UTC | 10m |
| 2026-05-28 | N7789C | - | May 28, 15:00 UTC | May 28, 15:40 UTC | 40m |
| 2026-05-28 | N7789C | - | May 28, 01:45 UTC | May 28, 01:55 UTC | 10m |
| 2026-05-24 | N7789C | - | May 24, 15:00 UTC | May 24, 15:10 UTC | 10m |
| 2026-05-21 | N7789C | - | May 21, 14:00 UTC | May 21, 14:25 UTC | 25m |
| 2026-05-17 | N7789C | - | May 17, 15:35 UTC | May 17, 15:55 UTC | 20m |
| 2026-05-12 | N7789C | - | May 12, 13:35 UTC | May 12, 14:10 UTC | 35m |
| 2026-05-09 | N7789C | - | May 9, 14:15 UTC | May 9, 14:30 UTC | 15m |
| 2026-05-07 | N7789C | - | May 7, 14:40 UTC | May 7, 15:00 UTC | 20m |
| 2026-05-03 | N7789C | - | May 3, 18:50 UTC | May 3, 19:50 UTC | 1h 0m |
| 2026-05-03 | N7789C | - | May 3, 15:40 UTC | May 3, 16:20 UTC | 40m |
| 2026-05-01 | N7789C | - | May 1, 14:00 UTC | May 1, 14:15 UTC | 15m |
| 2026-04-24 | N7789C | - | Apr 24, 00:05 UTC | Apr 24, 00:20 UTC | 15m |
| 2026-04-16 | N7789C | - | Apr 16, 15:40 UTC | Apr 16, 15:50 UTC | 10m |
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 N7789C page for operator, model, and routing details .