sensors Mode-S transponder
A6657F
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N511DP · BEECH 200 Super King Air · operated by AIR MED SERVICES LLC
- Hex
- A6657F
- Octal
- 51462577
- Decimal
- 10,904,959
- Country
- US
- Tail
- N511DP
- Type
- BE20
- Flights observed
- 71
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- Jul 25, 15:30 UTC
Last known position
Country allocation
The ICAO 24-bit address A6657F 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 |
|---|---|---|---|
| N511DP | - | 71 | 2026-07-25 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | N511DP | - | Jul 25, 15:20 UTC | Jul 25, 15:30 UTC | 10m |
| 2026-07-23 | N511DP | - | Jul 23, 23:40 UTC | Jul 23, 23:55 UTC | 15m |
| 2026-07-23 | N511DP | - | Jul 23, 22:10 UTC | Jul 23, 22:20 UTC | 10m |
| 2026-07-21 | N511DP | - | Jul 21, 11:20 UTC | Jul 21, 12:30 UTC | 1h 10m |
| 2026-07-20 | N511DP | - | Jul 20, 23:30 UTC | Jul 21, 00:35 UTC | 1h 4m |
| 2026-07-20 | N511DP | - | Jul 20, 14:10 UTC | Jul 20, 14:30 UTC | 20m |
| 2026-07-17 | N511DP | - | Jul 17, 18:19 UTC | Jul 17, 21:10 UTC | 2h 50m |
| 2026-07-17 | N511DP | - | Jul 17, 13:15 UTC | Jul 17, 15:35 UTC | 2h 20m |
| 2026-07-15 | N511DP | - | Jul 15, 00:05 UTC | Jul 15, 00:15 UTC | 10m |
| 2026-07-14 | N511DP | - | Jul 14, 21:50 UTC | Jul 14, 22:00 UTC | 10m |
| 2026-07-13 | N511DP | - | Jul 13, 11:25 UTC | Jul 13, 12:20 UTC | 55m |
| 2026-07-10 | N511DP | - | Jul 10, 23:55 UTC | Jul 11, 00:20 UTC | 25m |
| 2026-07-10 | N511DP | - | Jul 10, 21:55 UTC | Jul 10, 23:35 UTC | 1h 40m |
| 2026-07-10 | N511DP | - | Jul 10, 16:25 UTC | Jul 10, 18:20 UTC | 1h 55m |
| 2026-07-10 | N511DP | - | Jul 10, 15:05 UTC | Jul 10, 15:40 UTC | 35m |
| 2026-07-08 | N511DP | - | Jul 8, 21:25 UTC | Jul 8, 22:35 UTC | 1h 10m |
| 2026-07-07 | N511DP | - | Jul 7, 14:55 UTC | Jul 7, 16:15 UTC | 1h 20m |
| 2026-07-03 | N511DP | - | Jul 3, 20:35 UTC | Jul 3, 21:05 UTC | 30m |
| 2026-07-03 | N511DP | - | Jul 3, 19:20 UTC | Jul 3, 20:15 UTC | 55m |
| 2026-07-03 | N511DP | - | Jul 3, 16:25 UTC | Jul 3, 17:30 UTC | 1h 5m |
| 2026-07-03 | N511DP | - | Jul 3, 15:30 UTC | Jul 3, 16:05 UTC | 35m |
| 2026-07-03 | N511DP | - | Jul 3, 07:20 UTC | Jul 3, 07:45 UTC | 25m |
| 2026-07-03 | N511DP | - | Jul 3, 04:00 UTC | Jul 3, 04:55 UTC | 55m |
| 2026-07-03 | N511DP | - | Jul 3, 01:25 UTC | Jul 3, 02:20 UTC | 55m |
| 2026-06-21 | N511DP | - | Jun 21, 19:29 UTC | Jun 21, 21:10 UTC | 1h 40m |
| 2026-06-19 | N511DP | - | Jun 19, 18:59 UTC | Jun 19, 21:04 UTC | 2h 5m |
| 2026-06-17 | N511DP | - | Jun 17, 20:55 UTC | Jun 17, 21:25 UTC | 30m |
| 2026-06-17 | N511DP | - | Jun 17, 11:40 UTC | Jun 17, 12:00 UTC | 20m |
| 2026-06-12 | N511DP | - | Jun 12, 00:30 UTC | Jun 12, 00:50 UTC | 20m |
| 2026-06-11 | N511DP | - | Jun 11, 21:25 UTC | Jun 11, 21:45 UTC | 20m |
| 2026-05-31 | N511DP | - | May 31, 23:40 UTC | Jun 1, 00:05 UTC | 25m |
| 2026-05-31 | N511DP | - | May 31, 20:30 UTC | May 31, 21:05 UTC | 35m |
| 2026-05-30 | N511DP | - | May 30, 19:00 UTC | May 30, 20:55 UTC | 1h 55m |
| 2026-05-30 | N511DP | - | May 30, 16:10 UTC | May 30, 18:20 UTC | 2h 10m |
| 2026-05-29 | N511DP | - | May 29, 20:15 UTC | May 29, 21:15 UTC | 1h 0m |
| 2026-05-29 | N511DP | - | May 29, 18:25 UTC | May 29, 19:10 UTC | 45m |
| 2026-05-28 | N511DP | - | May 28, 18:40 UTC | May 28, 20:20 UTC | 1h 40m |
| 2026-05-26 | N511DP | - | May 26, 11:15 UTC | May 26, 12:10 UTC | 55m |
| 2026-05-26 | N511DP | - | May 26, 10:29 UTC | May 26, 10:39 UTC | 10m |
| 2026-05-26 | N511DP | - | May 26, 04:35 UTC | May 26, 05:30 UTC | 55m |
| 2026-05-25 | N511DP | - | May 25, 17:30 UTC | May 25, 18:35 UTC | 1h 5m |
| 2026-05-24 | N511DP | - | May 24, 20:50 UTC | May 24, 21:50 UTC | 1h 0m |
| 2026-05-18 | N511DP | - | May 18, 06:50 UTC | May 18, 07:15 UTC | 25m |
| 2026-05-18 | N511DP | - | May 18, 05:35 UTC | May 18, 06:10 UTC | 35m |
| 2026-05-18 | N511DP | - | May 18, 02:00 UTC | May 18, 02:35 UTC | 35m |
| 2026-05-17 | N511DP | - | May 17, 22:10 UTC | May 17, 22:40 UTC | 30m |
| 2026-05-11 | N511DP | - | May 11, 21:50 UTC | May 11, 22:15 UTC | 25m |
| 2026-05-11 | N511DP | - | May 11, 20:20 UTC | May 11, 21:20 UTC | 1h 0m |
| 2026-05-11 | N511DP | MSY → SHV | May 11, 16:45 UTC | May 11, 17:55 UTC | 1h 10m |
| 2026-05-11 | N511DP | - | May 11, 15:40 UTC | May 11, 16:00 UTC | 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 N511DP page for operator, model, and routing details .