Apparatus

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sensors Mode-S transponder

A6C491

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N535SA · operated by TVPX AIRCRAFT SOLUTIONS INC TRUSTEE

Hex
A6C491
Octal
51542221
Decimal
10,929,297
Country
US
Tail
N535SA
Type
C208
Broadcasting now · callsign FDY444 · 4,775 ft
Flights observed
478
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:10 UTC

Current position

A6C491 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A6C491 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 20 distinct

Callsign Airline Flights Last seen
FDY436 - 35 2026-07-26
FDY419 - 35 2026-07-26
FDY454 - 31 2026-06-30
FDY459 - 30 2026-06-29
FDY434 Southern Airways Express 30 2026-07-25
FDY411 Southern Airways Express 30 2026-07-25
FDY458 - 27 2026-06-29
FDY457 - 24 2026-07-10
FDY449 - 22 2026-07-10
FDY452 Southern Airways Express 20 2026-07-10
FDY455 Southern Airways Express 19 2026-04-27
FDY453 Southern Airways Express 19 2026-07-11
FDY450 Southern Airways Express 18 2026-04-25
FDY405 Southern Airways Express 15 2026-05-14
FDY404 Southern Airways Express 15 2026-05-14
FDY408 Southern Airways Express 14 2026-05-13
FDY409 Southern Airways Express 13 2026-05-13
FDY415 Southern Airways Express 11 2026-07-26
FDY414 Southern Airways Express 10 2026-07-24
FDY66 Southern Airways Express 9 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FDY415 HOT → MEM Jul 26, 17:40 UTCJul 26, 18:10 UTC30m
2026-07-26 FDY419 - Jul 26, 14:20 UTCJul 26, 15:15 UTC55m
2026-07-26 FDY436 - Jul 26, 12:20 UTCJul 26, 13:50 UTC1h 30m
2026-07-25 FDY411 DFW → HOT Jul 25, 21:15 UTCJul 25, 22:05 UTC50m
2026-07-25 FDY434 HOT → DFW Jul 25, 19:15 UTCJul 25, 20:25 UTC1h 10m
2026-07-25 FDY419 - Jul 25, 14:40 UTCJul 25, 15:30 UTC50m
2026-07-25 FDY436 - Jul 25, 12:35 UTCJul 25, 13:40 UTC1h 5m
2026-07-25 FDY411 DFW → HOT Jul 25, 01:50 UTCJul 25, 02:35 UTC45m
2026-07-25 FDY434 HOT → DFW Jul 25, 00:00 UTCJul 25, 00:55 UTC55m
2026-07-24 FDY414 MEM → HOT Jul 24, 19:20 UTCJul 24, 20:05 UTC45m
2026-07-24 FDY415 HOT → MEM Jul 24, 18:10 UTCJul 24, 18:40 UTC30m
2026-07-24 FDY419 - Jul 24, 14:55 UTCJul 24, 15:50 UTC55m
2026-07-24 FDY436 - Jul 24, 12:50 UTCJul 24, 13:50 UTC1h 0m
2026-07-24 FDY411 DFW → HOT Jul 24, 01:50 UTCJul 24, 02:45 UTC55m
2026-07-23 FDY434 HOT → DFW Jul 23, 23:55 UTCJul 24, 01:05 UTC1h 10m
2026-07-23 FDY417 - Jul 23, 20:55 UTCJul 23, 21:45 UTC50m
2026-07-23 FDY432 - Jul 23, 17:35 UTCJul 23, 18:25 UTC50m
2026-07-23 FDY419 - Jul 23, 14:30 UTCJul 23, 15:20 UTC50m
2026-07-23 FDY436 - Jul 23, 12:20 UTCJul 23, 13:50 UTC1h 30m
2026-07-22 FDY411 DFW → HOT Jul 22, 21:50 UTCJul 22, 22:50 UTC1h 0m
2026-07-22 FDY434 - Jul 22, 19:15 UTCJul 22, 20:20 UTC1h 5m
2026-07-22 FDY419 - Jul 22, 14:30 UTCJul 22, 15:20 UTC50m
2026-07-22 FDY436 - Jul 22, 12:45 UTCJul 22, 13:50 UTC1h 5m
2026-07-21 FDY411 DFW → HOT Jul 21, 21:20 UTCJul 21, 22:15 UTC55m
2026-07-21 FDY434 - Jul 21, 19:45 UTCJul 21, 20:45 UTC1h 0m
2026-07-21 FDY419 - Jul 21, 14:30 UTCJul 21, 15:20 UTC50m
2026-07-21 FDY436 - Jul 21, 12:30 UTCJul 21, 13:45 UTC1h 15m
2026-07-21 FDY411 DFW → HOT Jul 21, 01:00 UTCJul 21, 02:05 UTC1h 5m
2026-07-20 FDY434 - Jul 20, 23:15 UTCJul 21, 00:25 UTC1h 9m
2026-07-20 FDY417 - Jul 20, 20:25 UTCJul 20, 21:05 UTC40m
2026-07-20 FDY432 - Jul 20, 17:55 UTCJul 20, 19:00 UTC1h 5m
2026-07-20 FDY419 - Jul 20, 14:45 UTCJul 20, 15:30 UTC45m
2026-07-20 FDY436 - Jul 20, 12:20 UTCJul 20, 13:50 UTC1h 30m
2026-07-20 FDY411 DFW → HOT Jul 20, 02:25 UTCJul 20, 03:30 UTC1h 5m
2026-07-19 FDY434 - Jul 19, 23:55 UTCJul 20, 01:10 UTC1h 15m
2026-07-19 FDY414 - Jul 19, 19:35 UTCJul 19, 20:15 UTC40m
2026-07-19 FDY415 HOT → MEM Jul 19, 17:45 UTCJul 19, 18:15 UTC30m
2026-07-19 FDY419 - Jul 19, 14:40 UTCJul 19, 15:25 UTC45m
2026-07-19 FDY436 - Jul 19, 13:00 UTCJul 19, 13:55 UTC55m
2026-07-18 FDY411 DFW → HOT Jul 18, 21:45 UTCJul 18, 22:35 UTC50m
2026-07-18 FDY434 - Jul 18, 19:20 UTCJul 18, 20:35 UTC1h 15m
2026-07-18 FDY419 - Jul 18, 14:40 UTCJul 18, 15:25 UTC45m
2026-07-18 FDY436 - Jul 18, 12:40 UTCJul 18, 14:00 UTC1h 20m
2026-07-18 FDY411 DFW → HOT Jul 18, 01:15 UTCJul 18, 02:05 UTC50m
2026-07-17 FDY434 - Jul 17, 23:14 UTCJul 18, 00:39 UTC1h 25m
2026-07-17 FDY414 - Jul 17, 19:45 UTCJul 17, 20:25 UTC40m
2026-07-17 FDY415 HOT → MEM Jul 17, 18:00 UTCJul 17, 18:25 UTC25m
2026-07-17 FDY419 - Jul 17, 14:44 UTCJul 17, 15:29 UTC45m
2026-07-17 FDY436 - Jul 17, 13:00 UTCJul 17, 14:10 UTC1h 10m
2026-07-17 FDY411 DFW → HOT Jul 17, 02:05 UTCJul 17, 02:54 UTC50m

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 N535SA page for operator, model, and routing details .

Mode-S A6C491 frequently asked

What is Mode-S code A6C491?
A6C491 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N535SA.
Where is Mode-S A6C491 registered?
Mode-S code A6C491 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 A6C491 broadcasting right now?
Yes. Mode-S A6C491 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6C491, octal 51542221, decimal 10,929,297.
What flights does A6C491 operate?
Mode-S A6C491 has broadcast 20 distinct callsigns, including FDY436, FDY419, FDY454, FDY459, FDY434.