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
No current signal · last broadcast 7d ago
Flights observed
40
Distinct callsigns
2
Country
US
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S A4C1FD.

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

Callsign Airline Flights Last seen
N4053H - 39 2026-07-19
N4053G - 1 2026-04-30

Recent flights last 40

DateFlightRouteTakeoffLandingDuration
2026-07-19 N4053H ADS → CLL Jul 19, 04:25 UTCJul 19, 05:10 UTC45m
2026-07-19 N4053H CLL → ADS Jul 19, 02:20 UTCJul 19, 03:05 UTC45m
2026-07-18 N4053H DAL → CLL Jul 18, 20:00 UTCJul 18, 20:40 UTC40m
2026-07-18 N4053H CLL → ADS Jul 18, 17:20 UTCJul 18, 18:05 UTC45m
2026-07-12 N4053H - Jul 12, 19:50 UTCJul 12, 23:20 UTC3h 30m
2026-07-06 N4053H - Jul 6, 16:00 UTCJul 6, 18:55 UTC2h 55m
2026-06-30 N4053H - Jun 30, 20:30 UTCJun 30, 20:55 UTC25m
2026-06-30 N4053H - Jun 30, 16:30 UTCJun 30, 17:00 UTC30m
2026-06-30 N4053H - Jun 30, 13:15 UTCJun 30, 13:45 UTC30m
2026-06-28 N4053H - Jun 28, 21:10 UTCJun 28, 21:50 UTC40m
2026-06-28 N4053H - Jun 28, 19:14 UTCJun 28, 19:59 UTC45m
2026-06-28 N4053H - Jun 28, 02:49 UTCJun 28, 03:25 UTC35m
2026-06-27 N4053H - Jun 27, 00:44 UTCJun 27, 01:24 UTC40m
2026-06-26 N4053H - Jun 26, 20:40 UTCJun 26, 21:30 UTC50m
2026-06-14 N4053H - Jun 14, 22:55 UTCJun 14, 23:39 UTC44m
2026-06-14 N4053H - Jun 14, 00:00 UTCJun 14, 00:50 UTC50m
2026-06-11 N4053H - Jun 11, 23:20 UTCJun 12, 00:50 UTC1h 31m
2026-06-11 N4053H - Jun 11, 19:15 UTCJun 11, 21:25 UTC2h 10m
2026-06-07 N4053H - Jun 7, 23:05 UTCJun 7, 23:15 UTC10m
2026-06-07 N4053H - Jun 7, 20:50 UTCJun 7, 22:35 UTC1h 45m
2026-06-07 N4053H - Jun 7, 16:30 UTCJun 7, 18:00 UTC1h 30m
2026-06-03 N4053H - Jun 3, 19:40 UTCJun 3, 20:55 UTC1h 15m
2026-06-03 N4053H - Jun 3, 13:20 UTCJun 3, 14:40 UTC1h 20m
2026-05-25 N4053H - May 25, 20:30 UTCMay 25, 21:15 UTC45m
2026-05-25 N4053H - May 25, 18:10 UTCMay 25, 19:00 UTC50m
2026-05-23 N4053H - May 23, 23:00 UTCMay 24, 01:05 UTC2h 5m
2026-05-23 N4053H - May 23, 21:20 UTCMay 23, 22:00 UTC40m
2026-05-22 N4053H - May 22, 00:25 UTCMay 22, 01:55 UTC1h 30m
2026-05-21 N4053H - May 21, 18:05 UTCMay 21, 18:35 UTC30m
2026-05-21 N4053H - May 21, 13:25 UTCMay 21, 14:15 UTC50m
2026-05-13 N4053H - May 13, 22:20 UTCMay 13, 23:25 UTC1h 5m
2026-05-13 N4053H - May 13, 19:55 UTCMay 13, 20:50 UTC55m
2026-05-12 N4053H - May 12, 19:40 UTCMay 12, 20:40 UTC1h 0m
2026-05-12 N4053H - May 12, 17:25 UTCMay 12, 18:25 UTC1h 0m
2026-05-09 N4053H - May 9, 21:19 UTCMay 9, 21:55 UTC35m
2026-05-09 N4053H - May 9, 17:49 UTCMay 9, 20:40 UTC2h 50m
2026-05-09 N4053H - May 9, 13:10 UTCMay 9, 16:05 UTC2h 55m
2026-04-30 N4053G - Apr 30, 21:20 UTCApr 30, 21:40 UTC20m
2026-04-27 N4053H - Apr 27, 00:10 UTCApr 27, 00:45 UTC35m
2026-04-26 N4053H - Apr 26, 16:55 UTCApr 26, 17:35 UTC40m

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 .

Mode-S A4C1FD frequently asked

What is Mode-S code A4C1FD?
A4C1FD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4053H.
Where is Mode-S A4C1FD registered?
Mode-S code A4C1FD is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A4C1FD broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C1FD, octal 51140775, decimal 10,797,565.
What flights does A4C1FD operate?
Mode-S A4C1FD has broadcast 2 distinct callsigns, including N4053H, N4053G.