sensors Mode-S transponder
A4BB7D
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N404A · PIPER PA-31-300/310/325/350/425 · operated by BCJ LLC
- Hex
- A4BB7D
- Octal
- 51135575
- Decimal
- 10,795,901
- Country
- US
- Tail
- N404A
- Type
- PA31
- Flights observed
- 63
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 26, 19:50 UTC
Current position
Country allocation
The ICAO 24-bit address A4BB7D 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 |
|---|---|---|---|
| N404A | - | 63 | 2026-07-26 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | N404A | - | Jul 26, 18:00 UTC | Jul 26, 19:50 UTC | 1h 50m |
| 2026-07-26 | N404A | - | Jul 26, 15:00 UTC | Jul 26, 17:30 UTC | 2h 30m |
| 2026-07-26 | N404A | - | Jul 26, 13:35 UTC | Jul 26, 14:25 UTC | 50m |
| 2026-07-26 | N404A | - | Jul 26, 12:10 UTC | Jul 26, 12:50 UTC | 40m |
| 2026-07-25 | N404A | - | Jul 25, 21:05 UTC | Jul 25, 21:55 UTC | 50m |
| 2026-07-25 | N404A | - | Jul 25, 18:25 UTC | Jul 25, 19:15 UTC | 50m |
| 2026-07-24 | N404A | - | Jul 24, 21:00 UTC | Jul 24, 22:55 UTC | 1h 55m |
| 2026-07-24 | N404A | - | Jul 24, 18:25 UTC | Jul 24, 20:15 UTC | 1h 50m |
| 2026-07-24 | N404A | - | Jul 24, 15:30 UTC | Jul 24, 17:35 UTC | 2h 5m |
| 2026-07-21 | N404A | - | Jul 21, 22:55 UTC | Jul 22, 00:55 UTC | 2h 0m |
| 2026-07-21 | N404A | - | Jul 21, 20:00 UTC | Jul 21, 20:10 UTC | 10m |
| 2026-07-21 | N404A | - | Jul 21, 10:40 UTC | Jul 21, 12:45 UTC | 2h 5m |
| 2026-07-20 | N404A | - | Jul 20, 12:35 UTC | Jul 20, 16:00 UTC | 3h 25m |
| 2026-07-18 | N404A | - | Jul 18, 11:10 UTC | Jul 18, 13:35 UTC | 2h 25m |
| 2026-07-18 | N404A | - | Jul 18, 09:40 UTC | Jul 18, 10:10 UTC | 30m |
| 2026-06-24 | N404A | - | Jun 24, 19:15 UTC | Jun 24, 19:59 UTC | 45m |
| 2026-06-24 | N404A | - | Jun 24, 17:40 UTC | Jun 24, 18:50 UTC | 1h 10m |
| 2026-06-24 | N404A | - | Jun 24, 14:20 UTC | Jun 24, 15:14 UTC | 55m |
| 2026-06-18 | N404A | - | Jun 18, 16:20 UTC | Jun 18, 17:21 UTC | 1h 1m |
| 2026-06-18 | N404A | - | Jun 18, 13:50 UTC | Jun 18, 14:15 UTC | 25m |
| 2026-06-18 | N404A | - | Jun 18, 12:45 UTC | Jun 18, 13:15 UTC | 30m |
| 2026-06-16 | N404A | - | Jun 16, 16:15 UTC | Jun 16, 17:45 UTC | 1h 30m |
| 2026-06-16 | N404A | - | Jun 16, 15:30 UTC | Jun 16, 15:45 UTC | 15m |
| 2026-06-16 | N404A | - | Jun 16, 00:35 UTC | Jun 16, 01:35 UTC | 1h 0m |
| 2026-06-15 | N404A | - | Jun 15, 23:35 UTC | Jun 15, 23:50 UTC | 15m |
| 2026-06-15 | N404A | - | Jun 15, 20:45 UTC | Jun 15, 22:05 UTC | 1h 20m |
| 2026-06-15 | N404A | - | Jun 15, 19:20 UTC | Jun 15, 20:10 UTC | 50m |
| 2026-06-12 | N404A | - | Jun 12, 16:40 UTC | Jun 12, 18:05 UTC | 1h 25m |
| 2026-06-12 | N404A | - | Jun 12, 12:00 UTC | Jun 12, 16:00 UTC | 4h 0m |
| 2026-06-11 | N404A | - | Jun 11, 17:30 UTC | Jun 11, 18:05 UTC | 35m |
| 2026-05-29 | N404A | - | May 29, 12:50 UTC | May 29, 14:45 UTC | 1h 55m |
| 2026-05-29 | N404A | - | May 29, 10:20 UTC | May 29, 12:15 UTC | 1h 55m |
| 2026-05-18 | N404A | - | May 18, 19:00 UTC | May 18, 19:30 UTC | 30m |
| 2026-05-17 | N404A | - | May 17, 15:31 UTC | May 17, 16:05 UTC | 35m |
| 2026-05-17 | N404A | - | May 17, 14:20 UTC | May 17, 14:50 UTC | 30m |
| 2026-05-15 | N404A | - | May 15, 16:40 UTC | May 15, 17:15 UTC | 35m |
| 2026-05-15 | N404A | - | May 15, 15:35 UTC | May 15, 16:10 UTC | 35m |
| 2026-05-13 | N404A | - | May 13, 14:45 UTC | May 13, 15:15 UTC | 30m |
| 2026-05-13 | N404A | - | May 13, 12:45 UTC | May 13, 13:35 UTC | 50m |
| 2026-05-13 | N404A | - | May 13, 11:35 UTC | May 13, 11:55 UTC | 20m |
| 2026-05-11 | N404A | - | May 11, 18:55 UTC | May 11, 21:21 UTC | 2h 25m |
| 2026-05-11 | N404A | - | May 11, 15:50 UTC | May 11, 18:10 UTC | 2h 20m |
| 2026-05-06 | N404A | - | May 6, 19:25 UTC | May 6, 19:40 UTC | 15m |
| 2026-05-06 | N404A | - | May 6, 18:40 UTC | May 6, 19:00 UTC | 20m |
| 2026-05-06 | N404A | - | May 6, 17:15 UTC | May 6, 17:30 UTC | 15m |
| 2026-05-06 | N404A | - | May 6, 13:40 UTC | May 6, 14:45 UTC | 1h 5m |
| 2026-05-06 | N404A | - | May 6, 13:05 UTC | May 6, 13:20 UTC | 15m |
| 2026-05-02 | N404A | - | May 2, 18:15 UTC | May 2, 19:55 UTC | 1h 40m |
| 2026-05-02 | N404A | - | May 2, 12:50 UTC | May 2, 14:40 UTC | 1h 50m |
| 2026-05-02 | N404A | - | May 2, 11:55 UTC | May 2, 12:20 UTC | 25m |
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 N404A page for operator, model, and routing details .