Apparatus

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sensors Mode-S transponder

A0C5B5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N149SF · BEECH 1900 · operated by ALPINE AVIATION INC

Hex
A0C5B5
Octal
50142665
Decimal
10,536,373
Country
US
Tail
N149SF
Type
B190
No current signal · last broadcast 28d ago
Flights observed
39
Distinct callsigns
11
Country
US
Last broadcast
28d ago

Last known position

Most recent position reported by Mode-S A0C5B5.

Country allocation

The ICAO 24-bit address A0C5B5 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 11 distinct

Callsign Airline Flights Last seen
AIP8902 Alpine Air Express 9 2026-04-27
AIP8941 Alpine Air Express 7 2026-04-25
AIP8933 Alpine Air Express 5 2026-04-30
AIP23 - 4 2026-04-18
AIP8943 Alpine Air Express 3 2026-04-25
AIP8934 Alpine Air Express 3 2026-05-01
AIP475 Alpine Air Express 2 2026-05-01
AIP432 Alpine Air Express 2 2026-04-21
AIP357 Alpine Air Express 2 2026-04-23
AIP437 Alpine Air Express 1 2026-04-25
AIP422 Alpine Air Express 1 2026-04-13

Recent flights last 39

DateFlightRouteTakeoffLandingDuration
2026-05-01 AIP475 GDC → IND May 1, 13:00 UTCMay 1, 16:05 UTC3h 5m
2026-05-01 AIP8934 MHT → BTV May 1, 11:30 UTCMay 1, 12:00 UTC30m
2026-04-30 AIP8933 BTV → MHT Apr 30, 23:05 UTCApr 30, 23:40 UTC35m
2026-04-30 AIP8934 MHT → BTV Apr 30, 11:25 UTCApr 30, 12:05 UTC40m
2026-04-29 AIP8933 BTV → MHT Apr 29, 23:10 UTCApr 29, 23:45 UTC35m
2026-04-29 AIP8934 MHT → BTV Apr 29, 11:35 UTCApr 29, 12:10 UTC35m
2026-04-28 AIP8933 BTV → MHT Apr 28, 23:14 UTCApr 28, 23:45 UTC30m
2026-04-28 AIP8933 BTV → MHT Apr 28, 12:20 UTCApr 28, 12:55 UTC35m
2026-04-27 AIP8933 BTV → MHT Apr 27, 23:20 UTCApr 27, 23:55 UTC35m
2026-04-27 AIP475 GDC → IND Apr 27, 18:15 UTCApr 27, 20:25 UTC2h 10m
2026-04-27 AIP8902 SUS → LCK Apr 27, 01:25 UTCApr 27, 02:20 UTC55m
2026-04-26 AIP8902 SUS → LCK Apr 26, 23:00 UTCApr 27, 00:35 UTC1h 35m
2026-04-26 AIP8902 SUS → LCK Apr 26, 20:15 UTCApr 26, 21:55 UTC1h 40m
2026-04-25 AIP8941 PIB → GDC Apr 25, 23:35 UTCApr 26, 05:10 UTC5h 35m
2026-04-25 AIP8943 GDC → PIB Apr 25, 15:05 UTCApr 25, 16:30 UTC1h 25m
2026-04-25 AIP437 IND → GDC Apr 25, 00:25 UTCApr 25, 01:45 UTC1h 20m
2026-04-23 AIP357 RIC → FSD Apr 23, 23:10 UTCApr 24, 02:25 UTC3h 15m
2026-04-23 AIP8943 GDC → PIB Apr 23, 19:35 UTCApr 23, 20:45 UTC1h 10m
2026-04-23 AIP8943 GDC → PIB Apr 23, 17:40 UTCApr 23, 19:05 UTC1h 25m
2026-04-21 AIP357 RIC → FSD Apr 21, 23:30 UTCApr 22, 00:20 UTC50m
2026-04-21 AIP432 IND → OPF Apr 21, 19:25 UTCApr 21, 21:40 UTC2h 15m
2026-04-21 AIP432 IND → OPF Apr 21, 14:55 UTCApr 21, 18:10 UTC3h 15m
2026-04-21 AIP8941 PIB → GDC Apr 21, 01:05 UTCApr 21, 04:45 UTC3h 40m
2026-04-20 AIP8941 PIB → GDC Apr 20, 23:00 UTCApr 21, 00:30 UTC1h 30m
2026-04-20 AIP8941 PIB → GDC Apr 20, 19:20 UTCApr 20, 20:50 UTC1h 30m
2026-04-18 AIP23 - Apr 18, 17:50 UTCApr 18, 20:05 UTC2h 15m
2026-04-16 AIP8902 - Apr 16, 01:10 UTCApr 16, 01:20 UTC10m
2026-04-16 AIP8902 - Apr 16, 00:25 UTCApr 16, 01:05 UTC40m
2026-04-15 AIP8902 - Apr 15, 23:10 UTCApr 15, 23:40 UTC30m
2026-04-15 AIP8902 - Apr 15, 22:15 UTCApr 15, 23:00 UTC45m
2026-04-15 AIP8902 - Apr 15, 21:05 UTCApr 15, 21:30 UTC25m
2026-04-15 AIP8902 - Apr 15, 20:05 UTCApr 15, 21:00 UTC55m
2026-04-14 AIP23 - Apr 14, 22:55 UTCApr 14, 23:15 UTC20m
2026-04-14 AIP23 - Apr 14, 21:20 UTCApr 14, 22:50 UTC1h 30m
2026-04-13 AIP422 IND → GDC Apr 13, 23:10 UTCApr 13, 23:40 UTC30m
2026-04-13 AIP23 - Apr 13, 20:05 UTCApr 13, 21:00 UTC55m
2026-04-13 AIP8941 PIB → GDC Apr 13, 01:20 UTCApr 13, 03:40 UTC2h 20m
2026-04-13 AIP8941 PIB → GDC Apr 13, 00:20 UTCApr 13, 00:35 UTC15m
2026-04-12 AIP8941 PIB → GDC Apr 12, 23:55 UTCApr 13, 00:35 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 N149SF page for operator, model, and routing details .

Mode-S A0C5B5 frequently asked

What is Mode-S code A0C5B5?
A0C5B5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N149SF.
Where is Mode-S A0C5B5 registered?
Mode-S code A0C5B5 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 A0C5B5 broadcasting right now?
No active broadcast right now. Last signal was 28d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0C5B5, octal 50142665, decimal 10,536,373.
What flights does A0C5B5 operate?
Mode-S A0C5B5 has broadcast 11 distinct callsigns, including AIP8902, AIP8941, AIP8933, AIP23, AIP8943.