Apparatus

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sensors Mode-S transponder

AC231D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N881SA · operated by SOUTHERN AIRWAYS PACIFIC LLC

Hex
AC231D
Octal
53021435
Decimal
11,281,181
Country
US
Tail
N881SA
Type
C208
Broadcasting now · callsign FDY408 · 7,925 ft
Flights observed
314
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:10 UTC

Current position

AC231D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC231D 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
FDY335 - 27 2026-07-18
FDY328 Southern Airways Express 23 2026-07-18
FDY392 - 19 2026-07-06
FDY337 Southern Airways Express 13 2026-05-22
FDY332 Southern Airways Express 13 2026-05-22
FDY307 Southern Airways Express 13 2026-07-24
FDY235 Southern Airways Express 13 2026-07-26
FDY232 Southern Airways Express 13 2026-07-26
FDY308 Southern Airways Express 12 2026-07-24
FDY305 Southern Airways Express 12 2026-07-25
FDY227 Southern Airways Express 12 2026-07-25
FDY238 Southern Airways Express 11 2026-07-26
FDY126 - 11 2026-07-15
FDY304 Southern Airways Express 10 2026-07-25
FDY125 - 10 2026-07-15
FDY393 Southern Airways Express 9 2026-05-25
FDY233 Southern Airways Express 9 2026-07-24
FDY397 - 8 2026-07-04
FDY396 - 8 2026-07-05
FDY395 - 8 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FDY238 DUJ → PIT Jul 26, 19:40 UTCJul 26, 20:10 UTC30m
2026-07-26 FDY235 PIT → DUJ Jul 26, 18:25 UTCJul 26, 18:50 UTC25m
2026-07-26 FDY232 DUJ → PIT Jul 26, 16:40 UTCJul 26, 17:10 UTC30m
2026-07-25 FDY235 PIT → DUJ Jul 25, 18:30 UTCJul 25, 18:55 UTC25m
2026-07-25 FDY232 DUJ → PIT Jul 25, 16:45 UTCJul 25, 17:15 UTC30m
2026-07-25 FDY305 BFD → PIT Jul 25, 13:05 UTCJul 25, 14:40 UTC1h 35m
2026-07-25 FDY304 PIT → BFD Jul 25, 11:45 UTCJul 25, 12:15 UTC30m
2026-07-25 FDY227 DUJ → PIT Jul 25, 10:35 UTCJul 25, 11:10 UTC35m
2026-07-25 FDY239 PIT → DUJ Jul 25, 01:20 UTCJul 25, 01:40 UTC20m
2026-07-24 FDY307 BFD → PIT Jul 24, 23:15 UTCJul 24, 23:55 UTC40m
2026-07-24 FDY308 PIT → BFD Jul 24, 21:30 UTCJul 24, 22:00 UTC30m
2026-07-24 FDY238 DUJ → PIT Jul 24, 20:05 UTCJul 24, 20:35 UTC30m
2026-07-24 FDY235 PIT → DUJ Jul 24, 18:30 UTCJul 24, 18:55 UTC25m
2026-07-24 FDY232 DUJ → PIT Jul 24, 16:50 UTCJul 24, 17:25 UTC35m
2026-07-24 FDY233 PIT → DUJ Jul 24, 14:20 UTCJul 24, 14:45 UTC25m
2026-07-24 FDY305 BFD → PIT Jul 24, 12:45 UTCJul 24, 13:25 UTC40m
2026-07-24 FDY227 DUJ → PIT Jul 24, 10:35 UTCJul 24, 12:05 UTC1h 30m
2026-07-24 FDY239 PIT → DUJ Jul 24, 01:55 UTCJul 24, 02:20 UTC25m
2026-07-23 FDY307 BFD → PIT Jul 23, 23:10 UTCJul 23, 23:40 UTC30m
2026-07-23 FDY308 PIT → BFD Jul 23, 21:30 UTCJul 23, 22:05 UTC35m
2026-07-23 FDY238 DUJ → PIT Jul 23, 20:20 UTCJul 23, 20:45 UTC25m
2026-07-23 FDY235 PIT → DUJ Jul 23, 18:45 UTCJul 23, 19:10 UTC25m
2026-07-23 FDY232 DUJ → PIT Jul 23, 16:45 UTCJul 23, 17:10 UTC25m
2026-07-23 FDY233 PIT → DUJ Jul 23, 14:50 UTCJul 23, 15:15 UTC25m
2026-07-23 FDY305 BFD → PIT Jul 23, 12:55 UTCJul 23, 13:30 UTC35m
2026-07-23 FDY304 PIT → BFD Jul 23, 11:40 UTCJul 23, 12:05 UTC25m
2026-07-23 FDY227 DUJ → PIT Jul 23, 10:35 UTCJul 23, 11:00 UTC25m
2026-07-23 FDY239 PIT → DUJ Jul 23, 01:20 UTCJul 23, 01:45 UTC25m
2026-07-22 FDY307 BFD → PIT Jul 22, 23:10 UTCJul 22, 23:25 UTC15m
2026-07-22 FDY308 PIT → BFD Jul 22, 21:20 UTCJul 22, 21:40 UTC20m
2026-07-22 FDY238 DUJ → PIT Jul 22, 20:10 UTCJul 22, 20:45 UTC35m
2026-07-22 FDY235 PIT → DUJ Jul 22, 18:05 UTCJul 22, 18:30 UTC25m
2026-07-22 FDY232 DUJ → PIT Jul 22, 16:45 UTCJul 22, 17:15 UTC30m
2026-07-22 FDY233 PIT → DUJ Jul 22, 15:25 UTCJul 22, 15:50 UTC25m
2026-07-22 FDY305 BFD → PIT Jul 22, 14:15 UTCJul 22, 14:45 UTC30m
2026-07-22 FDY227 DUJ → PIT Jul 22, 11:35 UTCJul 22, 13:05 UTC1h 30m
2026-07-19 FDY121 IAD → DUJ Jul 19, 21:25 UTCJul 19, 22:20 UTC55m
2026-07-19 FDY128 DUJ → IAD Jul 19, 19:00 UTCJul 19, 20:05 UTC1h 5m
2026-07-19 FDY127 IAD → DUJ Jul 19, 16:55 UTCJul 19, 17:50 UTC55m
2026-07-19 FDY330 IPT → IAD Jul 19, 14:25 UTCJul 19, 15:30 UTC1h 5m
2026-07-18 FDY335 - Jul 18, 17:00 UTCJul 18, 17:55 UTC55m
2026-07-18 FDY328 IPT → IAD Jul 18, 10:05 UTCJul 18, 11:10 UTC1h 5m
2026-07-16 FDY335 - Jul 16, 17:10 UTCJul 16, 18:15 UTC1h 5m
2026-07-16 FDY328 - Jul 16, 10:04 UTCJul 16, 11:05 UTC1h 0m
2026-07-15 FDY335 - Jul 15, 16:40 UTCJul 15, 17:40 UTC1h 0m
2026-07-15 FDY126 - Jul 15, 14:20 UTCJul 15, 15:20 UTC1h 0m
2026-07-15 FDY125 - Jul 15, 12:30 UTCJul 15, 13:25 UTC55m
2026-07-15 FDY328 - Jul 15, 10:00 UTCJul 15, 11:00 UTC1h 0m
2026-07-14 FDY335 - Jul 14, 17:20 UTCJul 14, 18:25 UTC1h 5m
2026-07-14 FDY328 - Jul 14, 10:10 UTCJul 14, 11:05 UTC55m

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 N881SA page for operator, model, and routing details .

Mode-S AC231D frequently asked

What is Mode-S code AC231D?
AC231D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N881SA.
Where is Mode-S AC231D registered?
Mode-S code AC231D 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 AC231D broadcasting right now?
Yes. Mode-S AC231D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC231D, octal 53021435, decimal 11,281,181.
What flights does AC231D operate?
Mode-S AC231D has broadcast 20 distinct callsigns, including FDY335, FDY328, FDY392, FDY337, FDY332.