Apparatus

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sensors Mode-S transponder

A0C538

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N149MF · BEECH 90 King Air · operated by MERCY FLIGHTS INC

Hex
A0C538
Octal
50142470
Decimal
10,536,248
Country
US
Tail
N149MF
Type
BE9L
No current signal · last broadcast 1d ago
Flights observed
145
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A0C538.

Country allocation

The ICAO 24-bit address A0C538 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
N149MF - 145 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N149MF HIO → MFR Jul 26, 19:50 UTCJul 26, 20:45 UTC55m
2026-07-26 N149MF - Jul 26, 16:40 UTCJul 26, 17:10 UTC30m
2026-07-26 N149MF - Jul 26, 15:00 UTCJul 26, 15:15 UTC15m
2026-07-22 N149MF - Jul 22, 22:45 UTCJul 22, 23:15 UTC30m
2026-07-22 N149MF - Jul 22, 21:05 UTCJul 22, 21:15 UTC10m
2026-07-22 N149MF - Jul 22, 03:20 UTCJul 22, 04:15 UTC55m
2026-07-22 N149MF - Jul 22, 02:00 UTCJul 22, 03:15 UTC1h 15m
2026-07-21 N149MF HIO → MFR Jul 21, 19:35 UTCJul 21, 20:30 UTC55m
2026-07-21 N149MF MFR → HIO Jul 21, 16:00 UTCJul 21, 16:50 UTC50m
2026-07-21 N149MF MCC → MFR Jul 21, 06:50 UTCJul 21, 07:50 UTC1h 0m
2026-07-21 N149MF MFR → MCC Jul 21, 03:10 UTCJul 21, 04:15 UTC1h 5m
2026-07-20 N149MF - Jul 20, 23:20 UTCJul 20, 23:50 UTC30m
2026-07-20 N149MF - Jul 20, 20:55 UTCJul 20, 21:20 UTC25m
2026-07-20 N149MF - Jul 20, 18:45 UTCJul 20, 19:00 UTC15m
2026-07-20 N149MF - Jul 20, 14:45 UTCJul 20, 14:55 UTC10m
2026-07-20 N149MF - Jul 20, 13:30 UTCJul 20, 14:00 UTC30m
2026-07-20 N149MF - Jul 20, 11:05 UTCJul 20, 11:20 UTC15m
2026-07-20 N149MF - Jul 20, 08:45 UTCJul 20, 09:05 UTC20m
2026-07-19 N149MF HIO → MFR Jul 19, 15:40 UTCJul 19, 16:35 UTC55m
2026-07-19 N149MF - Jul 19, 12:35 UTCJul 19, 13:25 UTC50m
2026-07-19 N149MF HIO → MFR Jul 19, 04:20 UTCJul 19, 05:15 UTC55m
2026-07-19 N149MF - Jul 19, 01:10 UTCJul 19, 02:00 UTC50m
2026-07-18 N149MF - Jul 18, 11:10 UTCJul 18, 11:50 UTC40m
2026-07-18 N149MF - Jul 18, 09:25 UTCJul 18, 09:55 UTC30m
2026-07-18 N149MF - Jul 18, 07:55 UTCJul 18, 08:10 UTC15m
2026-07-17 N149MF RDD → MFR Jul 17, 22:10 UTCJul 17, 22:45 UTC35m
2026-07-17 N149MF MFR → RDD Jul 17, 19:30 UTCJul 17, 20:10 UTC40m
2026-07-17 N149MF HIO → MFR Jul 17, 08:54 UTCJul 17, 09:55 UTC1h 0m
2026-07-17 N149MF MFR → HIO Jul 17, 05:45 UTCJul 17, 06:29 UTC45m
2026-07-17 N149MF - Jul 17, 00:55 UTCJul 17, 01:45 UTC50m
2026-07-16 N149MF - Jul 16, 21:25 UTCJul 16, 22:15 UTC50m
2026-07-16 N149MF - Jul 16, 07:25 UTCJul 16, 08:20 UTC55m
2026-07-16 N149MF - Jul 16, 03:45 UTCJul 16, 04:35 UTC50m
2026-07-15 N149MF HIO → MFR Jul 15, 09:25 UTCJul 15, 10:20 UTC55m
2026-07-15 N149MF MFR → HIO Jul 15, 06:30 UTCJul 15, 07:20 UTC50m
2026-07-15 N149MF HIO → MFR Jul 15, 01:25 UTCJul 15, 02:20 UTC55m
2026-07-14 N149MF MFR → HIO Jul 14, 21:30 UTCJul 14, 22:15 UTC45m
2026-07-13 N149MF HIO → MFR Jul 13, 11:25 UTCJul 13, 12:20 UTC55m
2026-07-13 N149MF MFR → HIO Jul 13, 08:40 UTCJul 13, 09:25 UTC45m
2026-07-13 N149MF HIO → MFR Jul 13, 04:05 UTCJul 13, 05:05 UTC1h 0m
2026-07-13 N149MF MFR → HIO Jul 13, 00:20 UTCJul 13, 01:05 UTC45m
2026-07-06 N149MF - Jul 6, 20:05 UTCJul 6, 21:00 UTC55m
2026-07-06 N149MF MFR → HIO Jul 6, 16:45 UTCJul 6, 17:35 UTC50m
2026-06-25 N149MF - Jun 25, 09:40 UTCJun 25, 10:30 UTC50m
2026-06-25 N149MF MFR → PDX Jun 25, 05:55 UTCJun 25, 06:44 UTC50m
2026-06-24 N149MF - Jun 24, 16:50 UTCJun 24, 16:59 UTC10m
2026-06-23 N149MF - Jun 23, 19:29 UTCJun 23, 19:39 UTC10m
2026-06-20 N149MF - Jun 20, 15:04 UTCJun 20, 15:19 UTC15m
2026-06-15 N149MF - Jun 15, 18:50 UTCJun 15, 19:50 UTC1h 0m
2026-06-15 N149MF - Jun 15, 16:40 UTCJun 15, 18:10 UTC1h 30m

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 N149MF page for operator, model, and routing details .

Mode-S A0C538 frequently asked

What is Mode-S code A0C538?
A0C538 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N149MF.
Where is Mode-S A0C538 registered?
Mode-S code A0C538 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 A0C538 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0C538, octal 50142470, decimal 10,536,248.
What flights does A0C538 operate?
Mode-S A0C538 has broadcast 1 distinct callsign, including N149MF.