sensors Mode-S transponder
A661F0
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N510FD · CESSNA 510 Citation Mustang · operated by NC2 LLC
- Hex
- A661F0
- Octal
- 51460760
- Decimal
- 10,904,048
- Country
- US
- Tail
- N510FD
- Type
- C510
- Flights observed
- 30
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 2d ago
Last known position
Country allocation
The ICAO 24-bit address A661F0 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 |
|---|---|---|---|
| N510FD | - | 30 | 2026-07-24 |
Recent flights last 30
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-24 | N510FD | - | Jul 24, 21:05 UTC | Jul 24, 21:55 UTC | 50m |
| 2026-07-20 | N510FD | - | Jul 20, 14:20 UTC | Jul 20, 15:25 UTC | 1h 5m |
| 2026-07-18 | N510FD | - | Jul 18, 19:55 UTC | Jul 18, 22:10 UTC | 2h 15m |
| 2026-07-17 | N510FD | VGT → HIO | Jul 17, 14:44 UTC | Jul 17, 16:55 UTC | 2h 10m |
| 2026-07-14 | N510FD | - | Jul 14, 13:55 UTC | Jul 14, 15:05 UTC | 1h 10m |
| 2026-07-09 | N510FD | - | Jul 9, 14:05 UTC | Jul 9, 15:30 UTC | 1h 25m |
| 2026-07-06 | N510FD | - | Jul 6, 15:05 UTC | Jul 6, 16:00 UTC | 55m |
| 2026-07-01 | N510FD | VGT → MYF | Jul 1, 23:05 UTC | Jul 2, 00:10 UTC | 1h 5m |
| 2026-06-29 | N510FD | - | Jun 29, 13:39 UTC | Jun 29, 14:44 UTC | 1h 5m |
| 2026-06-22 | N510FD | - | Jun 22, 17:20 UTC | Jun 22, 18:24 UTC | 1h 5m |
| 2026-06-18 | N510FD | VGT → MYF | Jun 18, 14:20 UTC | Jun 18, 15:20 UTC | 1h 0m |
| 2026-06-15 | N510FD | - | Jun 15, 13:54 UTC | Jun 15, 15:00 UTC | 1h 5m |
| 2026-06-12 | N510FD | - | Jun 12, 14:05 UTC | Jun 12, 15:20 UTC | 1h 15m |
| 2026-06-08 | N510FD | - | Jun 8, 13:40 UTC | Jun 8, 14:55 UTC | 1h 15m |
| 2026-06-05 | N510FD | - | Jun 5, 13:50 UTC | Jun 5, 15:00 UTC | 1h 10m |
| 2026-06-01 | N510FD | - | Jun 1, 15:20 UTC | Jun 1, 16:30 UTC | 1h 10m |
| 2026-05-29 | N510FD | - | May 29, 14:30 UTC | May 29, 15:45 UTC | 1h 15m |
| 2026-05-25 | N510FD | - | May 25, 19:15 UTC | May 25, 20:15 UTC | 1h 0m |
| 2026-05-20 | N510FD | - | May 20, 14:55 UTC | May 20, 16:10 UTC | 1h 15m |
| 2026-05-15 | N510FD | - | May 15, 14:05 UTC | May 15, 15:15 UTC | 1h 9m |
| 2026-05-11 | N510FD | - | May 11, 14:15 UTC | May 11, 15:25 UTC | 1h 10m |
| 2026-05-09 | N510FD | - | May 9, 18:35 UTC | May 9, 19:45 UTC | 1h 10m |
| 2026-05-05 | N510FD | - | May 5, 15:10 UTC | May 5, 16:25 UTC | 1h 15m |
| 2026-05-01 | N510FD | - | May 1, 22:55 UTC | May 2, 00:05 UTC | 1h 10m |
| 2026-04-27 | N510FD | - | Apr 27, 13:55 UTC | Apr 27, 14:55 UTC | 1h 0m |
| 2026-04-24 | N510FD | - | Apr 24, 19:15 UTC | Apr 24, 20:30 UTC | 1h 15m |
| 2026-04-20 | N510FD | - | Apr 20, 15:00 UTC | Apr 20, 16:05 UTC | 1h 5m |
| 2026-04-16 | N510FD | - | Apr 16, 21:14 UTC | Apr 16, 21:55 UTC | 40m |
| 2026-04-16 | N510FD | - | Apr 16, 20:40 UTC | Apr 16, 21:10 UTC | 30m |
| 2026-04-13 | N510FD | - | Apr 13, 20:55 UTC | Apr 13, 21:45 UTC | 50m |
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 N510FD page for operator, model, and routing details .