Apparatus

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sensors Mode-S transponder

A23CB8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N243SD · operated by MEDARY AVIATION LLC

Hex
A23CB8
Octal
50436270
Decimal
10,632,376
Country
US
Tail
N243SD
Type
PA44
No current signal · last broadcast 14d ago
Flights observed
403
Distinct callsigns
1
Country
US
Last broadcast
14d ago

Last known position

Most recent position reported by Mode-S A23CB8.

Country allocation

The ICAO 24-bit address A23CB8 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 1 distinct

Callsign Airline Flights Last seen
N243SD - 403 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 N243SD - Jul 23, 14:45 UTCJul 23, 15:30 UTC45m
2026-07-23 N243SD BKX → BKX Jul 23, 14:30 UTCJul 23, 14:35 UTC5m
2026-07-22 N243SD - Jul 22, 16:45 UTCJul 22, 17:35 UTC50m
2026-07-22 N243SD BKX → BKX Jul 22, 16:30 UTCJul 22, 16:35 UTC5m
2026-07-22 N243SD BKX → BKX Jul 22, 14:55 UTCJul 22, 15:00 UTC5m
2026-07-22 N243SD BKX → BKX Jul 22, 14:35 UTCJul 22, 14:50 UTC15m
2026-07-22 N243SD - Jul 22, 12:40 UTCJul 22, 13:35 UTC55m
2026-07-22 N243SD BKX → BKX Jul 22, 12:20 UTCJul 22, 12:30 UTC10m
2026-07-21 N243SD BKX → BKX Jul 21, 22:45 UTCJul 21, 23:35 UTC50m
2026-07-21 N243SD BKX → BKX Jul 21, 18:05 UTCJul 21, 18:10 UTC5m
2026-07-21 N243SD BKX → BKX Jul 21, 17:50 UTCJul 21, 17:55 UTC5m
2026-07-21 N243SD BKX → BKX Jul 21, 17:35 UTCJul 21, 17:45 UTC10m
2026-07-21 N243SD BKX → BKX Jul 21, 14:35 UTCJul 21, 14:40 UTC5m
2026-07-21 N243SD BKX → BKX Jul 21, 14:20 UTCJul 21, 14:30 UTC10m
2026-07-21 N243SD BKX → BKX Jul 21, 13:35 UTCJul 21, 14:15 UTC40m
2026-07-21 N243SD - Jul 21, 01:40 UTCJul 21, 01:45 UTC5m
2026-07-21 N243SD BKX → BKX Jul 21, 00:35 UTCJul 21, 01:30 UTC55m
2026-07-20 N243SD BKX → BKX Jul 20, 19:35 UTCJul 20, 20:15 UTC40m
2026-07-20 N243SD BKX → BKX Jul 20, 17:55 UTCJul 20, 18:35 UTC40m
2026-07-20 N243SD BKX → BKX Jul 20, 16:00 UTCJul 20, 16:55 UTC55m
2026-07-17 N243SD BKX → BKX Jul 17, 15:05 UTCJul 17, 16:49 UTC1h 45m
2026-07-17 N243SD - Jul 17, 13:05 UTCJul 17, 13:35 UTC30m
2026-07-17 N243SD BKX → BKX Jul 17, 12:45 UTCJul 17, 12:55 UTC10m
2026-07-17 N243SD BKX → BKX Jul 17, 12:35 UTCJul 17, 12:40 UTC5m
2026-07-17 N243SD BKX → BKX Jul 17, 01:00 UTCJul 17, 01:05 UTC5m
2026-07-17 N243SD BKX → BKX Jul 17, 00:04 UTCJul 17, 00:50 UTC45m
2026-07-16 N243SD BKX → BKX Jul 16, 20:15 UTCJul 16, 20:19 UTC5m
2026-07-16 N243SD - Jul 16, 19:35 UTCJul 16, 20:09 UTC35m
2026-07-16 N243SD BKX → BKX Jul 16, 19:25 UTCJul 16, 19:30 UTC5m
2026-07-16 N243SD - Jul 16, 18:19 UTCJul 16, 18:25 UTC5m
2026-07-16 N243SD BKX → BKX Jul 16, 17:30 UTCJul 16, 18:05 UTC35m
2026-07-16 N243SD - Jul 16, 14:10 UTCJul 16, 14:15 UTC5m
2026-07-16 N243SD BKX → BKX Jul 16, 13:54 UTCJul 16, 14:05 UTC10m
2026-07-16 N243SD BKX → BKX Jul 16, 13:00 UTCJul 16, 13:49 UTC50m
2026-07-16 N243SD - Jul 16, 02:30 UTCJul 16, 03:35 UTC1h 5m
2026-07-16 N243SD - Jul 16, 00:45 UTCJul 16, 01:50 UTC1h 5m
2026-07-15 N243SD - Jul 15, 21:45 UTCJul 15, 22:40 UTC55m
2026-07-15 N243SD BKX → FAR Jul 15, 17:55 UTCJul 15, 19:00 UTC1h 5m
2026-07-15 N243SD BKX → BKX Jul 15, 14:05 UTCJul 15, 15:00 UTC55m
2026-07-15 N243SD - Jul 15, 00:50 UTCJul 15, 00:55 UTC5m
2026-07-15 N243SD BKX → BKX Jul 15, 00:30 UTCJul 15, 00:45 UTC15m
2026-07-15 N243SD BKX → BKX Jul 15, 00:05 UTCJul 15, 00:15 UTC10m
2026-07-14 N243SD - Jul 14, 22:30 UTCJul 14, 23:00 UTC29m
2026-07-14 N243SD BKX → BKX Jul 14, 22:10 UTCJul 14, 22:15 UTC5m
2026-07-14 N243SD BKX → BKX Jul 14, 20:05 UTCJul 14, 20:40 UTC35m
2026-07-14 N243SD BKX → BKX Jul 14, 18:00 UTCJul 14, 18:10 UTC10m
2026-07-14 N243SD BKX → BKX Jul 14, 17:10 UTCJul 14, 17:50 UTC40m
2026-07-14 N243SD BKX → BKX Jul 14, 15:10 UTCJul 14, 16:05 UTC55m
2026-07-14 N243SD - Jul 14, 13:15 UTCJul 14, 13:50 UTC35m
2026-07-14 N243SD BKX → BKX Jul 14, 13:00 UTCJul 14, 13:05 UTC5m

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 N243SD page for operator, model, and routing details .

Mode-S A23CB8 frequently asked

What is Mode-S code A23CB8?
A23CB8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N243SD.
Where is Mode-S A23CB8 registered?
Mode-S code A23CB8 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 A23CB8 broadcasting right now?
No active broadcast right now. Last signal was 14d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23CB8, octal 50436270, decimal 10,632,376.
What flights does A23CB8 operate?
Mode-S A23CB8 has broadcast 1 distinct callsign, including N243SD.