sensors Mode-S transponder
A703AF
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N551FR · GULFSTREAM 5 · operated by ONEFLIGHT INTERNATIONAL INC.
- Hex
- A703AF
- Octal
- 51601657
- Decimal
- 10,945,455
- Country
- US
- Tail
- N551FR
- Type
- GLF5
- Flights observed
- 53
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 16h ago
Last known position
Country allocation
The ICAO 24-bit address A703AF 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 |
|---|---|---|---|
| N551FR | - | 53 | 2026-06-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-17 | N551FR | - | Jun 17, 09:20 UTC | Jun 17, 21:10 UTC | 11h 50m |
| 2026-06-16 | N551FR | - | Jun 16, 09:50 UTC | Jun 16, 12:00 UTC | 2h 10m |
| 2026-06-15 | N551FR | - | Jun 15, 11:15 UTC | Jun 15, 12:30 UTC | 1h 15m |
| 2026-06-15 | N551FR | - | Jun 15, 01:20 UTC | Jun 15, 10:05 UTC | 8h 45m |
| 2026-06-13 | N551FR | - | Jun 13, 20:55 UTC | Jun 13, 23:00 UTC | 2h 5m |
| 2026-06-13 | N551FR | VNY → TPA | Jun 13, 05:05 UTC | Jun 13, 09:05 UTC | 4h 0m |
| 2026-06-12 | N551FR | - | Jun 12, 22:55 UTC | Jun 13, 00:50 UTC | 1h 55m |
| 2026-06-09 | N551FR | - | Jun 9, 21:35 UTC | Jun 9, 23:25 UTC | 1h 50m |
| 2026-06-09 | N551FR | - | Jun 9, 17:55 UTC | Jun 9, 20:10 UTC | 2h 15m |
| 2026-06-08 | N551FR | - | Jun 8, 07:35 UTC | Jun 8, 18:40 UTC | 11h 5m |
| 2026-06-07 | N551FR | ATH → KVA | Jun 7, 09:05 UTC | Jun 7, 09:35 UTC | 30m |
| 2026-06-06 | N551FR | - | Jun 6, 21:00 UTC | Jun 7, 06:55 UTC | 9h 55m |
| 2026-06-05 | N551FR | - | Jun 5, 16:35 UTC | Jun 5, 19:20 UTC | 2h 45m |
| 2026-06-02 | N551FR | - | Jun 2, 15:05 UTC | Jun 2, 17:15 UTC | 2h 10m |
| 2026-06-02 | N551FR | - | Jun 2, 00:10 UTC | Jun 2, 02:10 UTC | 2h 0m |
| 2026-06-01 | N551FR | MCO → SCF | Jun 1, 19:15 UTC | Jun 1, 23:20 UTC | 4h 5m |
| 2026-06-01 | N551FR | - | Jun 1, 02:25 UTC | Jun 1, 06:50 UTC | 4h 25m |
| 2026-05-31 | N551FR | KOA → APC | May 31, 21:15 UTC | Jun 1, 01:35 UTC | 4h 20m |
| 2026-05-31 | N551FR | - | May 31, 00:35 UTC | May 31, 00:50 UTC | 15m |
| 2026-05-30 | N551FR | - | May 30, 18:25 UTC | May 30, 20:10 UTC | 1h 45m |
| 2026-05-30 | N551FR | APA → PVU | May 30, 16:15 UTC | May 30, 17:15 UTC | 1h 0m |
| 2026-05-28 | N551FR | - | May 28, 21:15 UTC | May 29, 00:25 UTC | 3h 10m |
| 2026-05-28 | N551FR | - | May 28, 16:35 UTC | May 28, 20:15 UTC | 3h 40m |
| 2026-05-28 | N551FR | - | May 28, 13:30 UTC | May 28, 14:50 UTC | 1h 20m |
| 2026-05-27 | N551FR | - | May 27, 18:25 UTC | May 27, 19:45 UTC | 1h 20m |
| 2026-05-26 | N551FR | - | May 26, 22:25 UTC | May 26, 23:45 UTC | 1h 20m |
| 2026-05-24 | N551FR | - | May 24, 23:00 UTC | May 24, 23:46 UTC | 46m |
| 2026-05-22 | N551FR | - | May 22, 17:20 UTC | May 22, 18:45 UTC | 1h 25m |
| 2026-05-22 | N551FR | - | May 22, 15:05 UTC | May 22, 15:20 UTC | 15m |
| 2026-05-21 | N551FR | - | May 21, 23:30 UTC | May 22, 01:25 UTC | 1h 55m |
| 2026-05-21 | N551FR | - | May 21, 21:15 UTC | May 21, 21:55 UTC | 40m |
| 2026-05-21 | N551FR | - | May 21, 19:00 UTC | May 21, 20:15 UTC | 1h 15m |
| 2026-05-17 | N551FR | - | May 17, 16:01 UTC | May 17, 17:55 UTC | 1h 55m |
| 2026-05-17 | N551FR | - | May 17, 12:50 UTC | May 17, 14:05 UTC | 1h 15m |
| 2026-05-16 | N551FR | - | May 16, 17:25 UTC | May 17, 04:25 UTC | 11h 0m |
| 2026-05-15 | N551FR | - | May 15, 02:25 UTC | May 15, 11:50 UTC | 9h 25m |
| 2026-05-12 | N551FR | - | May 12, 15:50 UTC | May 12, 20:20 UTC | 4h 30m |
| 2026-05-12 | N551FR | YYZ → ATW | May 12, 13:55 UTC | May 12, 15:10 UTC | 1h 15m |
| 2026-05-11 | N551FR | - | May 11, 18:50 UTC | May 11, 21:30 UTC | 2h 40m |
| 2026-05-11 | N551FR | - | May 11, 15:30 UTC | May 11, 16:45 UTC | 1h 15m |
| 2026-05-11 | N551FR | - | May 11, 02:30 UTC | May 11, 03:05 UTC | 35m |
| 2026-05-11 | N551FR | - | May 11, 00:30 UTC | May 11, 01:05 UTC | 35m |
| 2026-05-10 | N551FR | - | May 10, 22:30 UTC | May 10, 23:29 UTC | 1h 0m |
| 2026-05-09 | N551FR | - | May 9, 20:10 UTC | May 9, 21:40 UTC | 1h 30m |
| 2026-05-09 | N551FR | - | May 9, 15:10 UTC | May 9, 19:10 UTC | 4h 0m |
| 2026-05-08 | N551FR | - | May 8, 07:09 UTC | May 8, 17:35 UTC | 10h 25m |
| 2026-05-06 | N551FR | - | May 6, 23:10 UTC | May 7, 06:20 UTC | 7h 10m |
| 2026-05-05 | N551FR | - | May 5, 16:20 UTC | May 5, 20:01 UTC | 3h 40m |
| 2026-05-04 | N551FR | - | May 4, 17:15 UTC | May 4, 22:45 UTC | 5h 31m |
| 2026-05-03 | N551FR | WHP → TEB | May 3, 17:20 UTC | May 3, 21:39 UTC | 4h 20m |
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 N551FR page for operator, model, and routing details .