sensors Mode-S transponder
A4C1FD
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N4053H · BEECH 200 Super King Air · operated by COSMOS HOLDINGS GROUP LLC
- Hex
- A4C1FD
- Octal
- 51140775
- Decimal
- 10,797,565
- Country
- US
- Tail
- N4053H
- Type
- BE20
- Flights observed
- 40
- Distinct callsigns
- 2
- Country
- US
- Last broadcast
- 7d ago
Last known position
Country allocation
The ICAO 24-bit address A4C1FD 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 2 distinct
Recent flights last 40
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-19 | N4053H | ADS → CLL | Jul 19, 04:25 UTC | Jul 19, 05:10 UTC | 45m |
| 2026-07-19 | N4053H | CLL → ADS | Jul 19, 02:20 UTC | Jul 19, 03:05 UTC | 45m |
| 2026-07-18 | N4053H | DAL → CLL | Jul 18, 20:00 UTC | Jul 18, 20:40 UTC | 40m |
| 2026-07-18 | N4053H | CLL → ADS | Jul 18, 17:20 UTC | Jul 18, 18:05 UTC | 45m |
| 2026-07-12 | N4053H | - | Jul 12, 19:50 UTC | Jul 12, 23:20 UTC | 3h 30m |
| 2026-07-06 | N4053H | - | Jul 6, 16:00 UTC | Jul 6, 18:55 UTC | 2h 55m |
| 2026-06-30 | N4053H | - | Jun 30, 20:30 UTC | Jun 30, 20:55 UTC | 25m |
| 2026-06-30 | N4053H | - | Jun 30, 16:30 UTC | Jun 30, 17:00 UTC | 30m |
| 2026-06-30 | N4053H | - | Jun 30, 13:15 UTC | Jun 30, 13:45 UTC | 30m |
| 2026-06-28 | N4053H | - | Jun 28, 21:10 UTC | Jun 28, 21:50 UTC | 40m |
| 2026-06-28 | N4053H | - | Jun 28, 19:14 UTC | Jun 28, 19:59 UTC | 45m |
| 2026-06-28 | N4053H | - | Jun 28, 02:49 UTC | Jun 28, 03:25 UTC | 35m |
| 2026-06-27 | N4053H | - | Jun 27, 00:44 UTC | Jun 27, 01:24 UTC | 40m |
| 2026-06-26 | N4053H | - | Jun 26, 20:40 UTC | Jun 26, 21:30 UTC | 50m |
| 2026-06-14 | N4053H | - | Jun 14, 22:55 UTC | Jun 14, 23:39 UTC | 44m |
| 2026-06-14 | N4053H | - | Jun 14, 00:00 UTC | Jun 14, 00:50 UTC | 50m |
| 2026-06-11 | N4053H | - | Jun 11, 23:20 UTC | Jun 12, 00:50 UTC | 1h 31m |
| 2026-06-11 | N4053H | - | Jun 11, 19:15 UTC | Jun 11, 21:25 UTC | 2h 10m |
| 2026-06-07 | N4053H | - | Jun 7, 23:05 UTC | Jun 7, 23:15 UTC | 10m |
| 2026-06-07 | N4053H | - | Jun 7, 20:50 UTC | Jun 7, 22:35 UTC | 1h 45m |
| 2026-06-07 | N4053H | - | Jun 7, 16:30 UTC | Jun 7, 18:00 UTC | 1h 30m |
| 2026-06-03 | N4053H | - | Jun 3, 19:40 UTC | Jun 3, 20:55 UTC | 1h 15m |
| 2026-06-03 | N4053H | - | Jun 3, 13:20 UTC | Jun 3, 14:40 UTC | 1h 20m |
| 2026-05-25 | N4053H | - | May 25, 20:30 UTC | May 25, 21:15 UTC | 45m |
| 2026-05-25 | N4053H | - | May 25, 18:10 UTC | May 25, 19:00 UTC | 50m |
| 2026-05-23 | N4053H | - | May 23, 23:00 UTC | May 24, 01:05 UTC | 2h 5m |
| 2026-05-23 | N4053H | - | May 23, 21:20 UTC | May 23, 22:00 UTC | 40m |
| 2026-05-22 | N4053H | - | May 22, 00:25 UTC | May 22, 01:55 UTC | 1h 30m |
| 2026-05-21 | N4053H | - | May 21, 18:05 UTC | May 21, 18:35 UTC | 30m |
| 2026-05-21 | N4053H | - | May 21, 13:25 UTC | May 21, 14:15 UTC | 50m |
| 2026-05-13 | N4053H | - | May 13, 22:20 UTC | May 13, 23:25 UTC | 1h 5m |
| 2026-05-13 | N4053H | - | May 13, 19:55 UTC | May 13, 20:50 UTC | 55m |
| 2026-05-12 | N4053H | - | May 12, 19:40 UTC | May 12, 20:40 UTC | 1h 0m |
| 2026-05-12 | N4053H | - | May 12, 17:25 UTC | May 12, 18:25 UTC | 1h 0m |
| 2026-05-09 | N4053H | - | May 9, 21:19 UTC | May 9, 21:55 UTC | 35m |
| 2026-05-09 | N4053H | - | May 9, 17:49 UTC | May 9, 20:40 UTC | 2h 50m |
| 2026-05-09 | N4053H | - | May 9, 13:10 UTC | May 9, 16:05 UTC | 2h 55m |
| 2026-04-30 | N4053G | - | Apr 30, 21:20 UTC | Apr 30, 21:40 UTC | 20m |
| 2026-04-27 | N4053H | - | Apr 27, 00:10 UTC | Apr 27, 00:45 UTC | 35m |
| 2026-04-26 | N4053H | - | Apr 26, 16:55 UTC | Apr 26, 17:35 UTC | 40m |
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 N4053H page for operator, model, and routing details .