Apparatus

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sensors Mode-S transponder

A6243C

ICAO 24-bit transponder address · allocated to United States

Hex
A6243C
Octal
51422074
Decimal
10,888,252
Country
US
No current signal · last broadcast Jul 26, 21:00 UTC
Flights observed
61
Distinct callsigns
12
Country
US
Last broadcast
Jul 26, 21:00 UTC

Last known position

Most recent position reported by Mode-S A6243C.

Country allocation

The ICAO 24-bit address A6243C 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 12 distinct

Callsign Airline Flights Last seen
FDY457 Southern Airways Express 10 2026-07-26
FDY453 Southern Airways Express 9 2026-07-25
FDY452 Southern Airways Express 9 2026-07-25
FDY444 Southern Airways Express 9 2026-07-26
FDY448 Southern Airways Express 8 2026-07-26
FDY449 Southern Airways Express 7 2026-07-24
N495SA - 2 2026-05-18
FDY447 Southern Airways Express 2 2026-07-25
FDY446 Southern Airways Express 2 2026-07-25
FDY8032 - 1 2026-07-15
FDY8030 - 1 2026-07-15
FDY8020 - 1 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FDY448 JBR → BNA Jul 26, 20:50 UTCJul 26, 21:00 UTC10m
2026-07-26 FDY457 STL → JBR Jul 26, 18:55 UTCJul 26, 20:05 UTC1h 10m
2026-07-26 FDY444 BRL → ORD Jul 26, 17:05 UTCJul 26, 18:10 UTC1h 5m
2026-07-25 FDY447 BNA → JBR Jul 25, 20:35 UTCJul 25, 21:50 UTC1h 15m
2026-07-25 FDY446 JBR → BNA Jul 25, 18:20 UTCJul 25, 19:35 UTC1h 15m
2026-07-25 FDY453 BNA → JBR Jul 25, 14:55 UTCJul 25, 16:15 UTC1h 20m
2026-07-25 FDY452 JBR → BNA Jul 25, 13:15 UTCJul 25, 14:25 UTC1h 10m
2026-07-24 FDY449 STL → JBR Jul 24, 23:25 UTCJul 25, 00:45 UTC1h 20m
2026-07-24 FDY448 JBR → BNA Jul 24, 21:35 UTCJul 24, 22:50 UTC1h 15m
2026-07-24 FDY457 STL → JBR Jul 24, 18:30 UTCJul 24, 19:35 UTC1h 5m
2026-07-24 FDY444 BRL → ORD Jul 24, 16:35 UTCJul 24, 17:50 UTC1h 15m
2026-07-24 FDY453 BNA → JBR Jul 24, 14:25 UTCJul 24, 15:50 UTC1h 25m
2026-07-24 FDY452 JBR → BNA Jul 24, 12:40 UTCJul 24, 13:50 UTC1h 10m
2026-07-23 FDY449 STL → JBR Jul 23, 23:30 UTCJul 24, 00:45 UTC1h 15m
2026-07-23 FDY448 JBR → BNA Jul 23, 21:35 UTCJul 23, 22:55 UTC1h 20m
2026-07-23 FDY457 STL → JBR Jul 23, 19:15 UTCJul 23, 20:15 UTC1h 0m
2026-07-23 FDY444 BRL → ORD Jul 23, 16:40 UTCJul 23, 17:55 UTC1h 15m
2026-07-23 FDY453 BNA → JBR Jul 23, 14:30 UTCJul 23, 15:50 UTC1h 20m
2026-07-23 FDY452 - Jul 23, 12:40 UTCJul 23, 13:50 UTC1h 10m
2026-07-22 FDY449 STL → JBR Jul 22, 23:25 UTCJul 23, 00:40 UTC1h 15m
2026-07-22 FDY448 JBR → BNA Jul 22, 21:40 UTCJul 22, 22:50 UTC1h 10m
2026-07-22 FDY457 - Jul 22, 18:55 UTCJul 22, 20:00 UTC1h 5m
2026-07-22 FDY444 BRL → ORD Jul 22, 16:50 UTCJul 22, 18:10 UTC1h 20m
2026-07-22 FDY453 - Jul 22, 14:50 UTCJul 22, 16:05 UTC1h 15m
2026-07-22 FDY452 JBR → BNA Jul 22, 12:45 UTCJul 22, 14:10 UTC1h 25m
2026-07-21 FDY457 STL → JBR Jul 21, 18:50 UTCJul 21, 19:55 UTC1h 5m
2026-07-21 FDY444 BRL → ORD Jul 21, 16:55 UTCJul 21, 18:10 UTC1h 15m
2026-07-21 FDY453 BNA → JBR Jul 21, 14:35 UTCJul 21, 15:50 UTC1h 15m
2026-07-21 FDY452 JBR → BNA Jul 21, 12:40 UTCJul 21, 13:50 UTC1h 10m
2026-07-20 FDY449 - Jul 20, 23:30 UTCJul 21, 00:45 UTC1h 14m
2026-07-20 FDY448 JBR → BNA Jul 20, 21:35 UTCJul 20, 22:50 UTC1h 15m
2026-07-20 FDY457 STL → JBR Jul 20, 19:05 UTCJul 20, 20:15 UTC1h 10m
2026-07-20 FDY444 BRL → ORD Jul 20, 16:45 UTCJul 20, 18:05 UTC1h 20m
2026-07-20 FDY453 BNA → JBR Jul 20, 14:50 UTCJul 20, 16:05 UTC1h 15m
2026-07-20 FDY452 - Jul 20, 12:40 UTCJul 20, 14:00 UTC1h 20m
2026-07-19 FDY457 - Jul 19, 20:10 UTCJul 19, 20:20 UTC10m
2026-07-19 FDY457 - Jul 19, 19:10 UTCJul 19, 19:35 UTC25m
2026-07-19 FDY444 BRL → ORD Jul 19, 17:00 UTCJul 19, 18:15 UTC1h 15m
2026-07-18 FDY447 BNA → JBR Jul 18, 20:30 UTCJul 18, 21:45 UTC1h 15m
2026-07-18 FDY446 - Jul 18, 18:20 UTCJul 18, 19:25 UTC1h 5m
2026-07-18 FDY453 BNA → JBR Jul 18, 14:25 UTCJul 18, 15:40 UTC1h 15m
2026-07-18 FDY452 - Jul 18, 12:40 UTCJul 18, 13:50 UTC1h 10m
2026-07-17 FDY449 - Jul 17, 23:39 UTCJul 18, 01:00 UTC1h 20m
2026-07-17 FDY448 JBR → BNA Jul 17, 21:39 UTCJul 17, 22:55 UTC1h 15m
2026-07-17 FDY457 - Jul 17, 19:00 UTCJul 17, 20:10 UTC1h 10m
2026-07-17 FDY444 - Jul 17, 16:44 UTCJul 17, 18:00 UTC1h 15m
2026-07-17 FDY453 BNA → JBR Jul 17, 14:44 UTCJul 17, 16:00 UTC1h 15m
2026-07-17 FDY452 JBR → BNA Jul 17, 12:45 UTCJul 17, 14:00 UTC1h 15m
2026-07-16 FDY449 - Jul 16, 23:35 UTCJul 17, 00:50 UTC1h 15m
2026-07-16 FDY448 - Jul 16, 21:40 UTCJul 16, 22:55 UTC1h 15m

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.

Mode-S A6243C frequently asked

What is Mode-S code A6243C?
A6243C is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A6243C registered?
Mode-S code A6243C 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 A6243C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6243C, octal 51422074, decimal 10,888,252.
What flights does A6243C operate?
Mode-S A6243C has broadcast 12 distinct callsigns, including FDY457, FDY453, FDY452, FDY444, FDY448.