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sensors Mode-S transponder

A0C427

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N149AH · AIRBUS HELICOPTERS EC-145 · operated by ADVENTIST HEALTH SYSTEM SUNBELT INC DBA, ADVENTHEALTH

Hex
A0C427
Octal
50142047
Decimal
10,535,975
Country
US
Tail
N149AH
Type
EC45
No current signal · last broadcast 1d ago
Flights observed
326
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A0C427.

Country allocation

The ICAO 24-bit address A0C427 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
N149AH - 326 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N149AH - Jul 26, 16:30 UTCJul 26, 16:40 UTC10m
2026-07-26 N149AH - Jul 26, 15:00 UTCJul 26, 15:40 UTC40m
2026-07-25 N149AH - Jul 25, 21:00 UTCJul 25, 21:10 UTC10m
2026-07-25 N149AH - Jul 25, 19:50 UTCJul 25, 20:25 UTC35m
2026-07-25 N149AH - Jul 25, 04:05 UTCJul 25, 04:25 UTC20m
2026-07-25 N149AH - Jul 25, 03:05 UTCJul 25, 03:30 UTC25m
2026-07-25 N149AH - Jul 25, 01:20 UTCJul 25, 01:35 UTC15m
2026-07-25 N149AH - Jul 25, 00:40 UTCJul 25, 00:50 UTC10m
2026-07-24 N149AH - Jul 24, 23:55 UTCJul 25, 00:05 UTC10m
2026-07-24 N149AH - Jul 24, 22:50 UTCJul 24, 23:20 UTC30m
2026-07-24 N149AH - Jul 24, 06:55 UTCJul 24, 07:25 UTC30m
2026-07-23 N149AH - Jul 23, 22:25 UTCJul 23, 23:45 UTC1h 20m
2026-07-23 N149AH - Jul 23, 19:15 UTCJul 23, 19:55 UTC40m
2026-07-23 N149AH - Jul 23, 18:05 UTCJul 23, 18:40 UTC35m
2026-07-23 N149AH - Jul 23, 01:05 UTCJul 23, 01:25 UTC20m
2026-07-22 N149AH - Jul 22, 23:30 UTCJul 22, 23:55 UTC25m
2026-07-22 N149AH - Jul 22, 19:15 UTCJul 22, 19:40 UTC25m
2026-07-22 N149AH - Jul 22, 18:10 UTCJul 22, 18:25 UTC15m
2026-07-22 N149AH - Jul 22, 17:05 UTCJul 22, 17:20 UTC15m
2026-07-22 N149AH - Jul 22, 14:15 UTCJul 22, 14:30 UTC15m
2026-07-22 N149AH - Jul 22, 13:25 UTCJul 22, 13:35 UTC10m
2026-07-22 N149AH - Jul 22, 01:05 UTCJul 22, 01:40 UTC35m
2026-07-21 N149AH - Jul 21, 23:40 UTCJul 22, 00:00 UTC20m
2026-07-21 N149AH - Jul 21, 22:50 UTCJul 21, 23:10 UTC20m
2026-07-21 N149AH - Jul 21, 16:45 UTCJul 21, 17:15 UTC30m
2026-07-21 N149AH - Jul 21, 13:30 UTCJul 21, 14:05 UTC35m
2026-07-21 N149AH - Jul 21, 09:10 UTCJul 21, 09:40 UTC30m
2026-07-21 N149AH - Jul 21, 07:00 UTCJul 21, 07:20 UTC20m
2026-07-21 N149AH - Jul 21, 04:00 UTCJul 21, 04:10 UTC10m
2026-07-20 N149AH - Jul 20, 05:05 UTCJul 20, 05:25 UTC20m
2026-07-20 N149AH - Jul 20, 04:20 UTCJul 20, 04:35 UTC15m
2026-07-19 N149AH - Jul 19, 20:50 UTCJul 19, 21:00 UTC10m
2026-07-19 N149AH - Jul 19, 19:50 UTCJul 19, 20:20 UTC30m
2026-07-19 N149AH - Jul 19, 12:30 UTCJul 19, 13:05 UTC35m
2026-07-19 N149AH - Jul 19, 00:30 UTCJul 19, 01:10 UTC40m
2026-07-18 N149AH - Jul 18, 23:15 UTCJul 19, 00:00 UTC45m
2026-07-18 N149AH - Jul 18, 13:30 UTCJul 18, 13:40 UTC10m
2026-07-18 N149AH - Jul 18, 12:25 UTCJul 18, 12:40 UTC15m
2026-07-18 N149AH - Jul 18, 05:25 UTCJul 18, 05:50 UTC25m
2026-07-18 N149AH - Jul 18, 03:50 UTCJul 18, 04:10 UTC20m
2026-07-18 N149AH - Jul 18, 01:20 UTCJul 18, 01:39 UTC20m
2026-07-17 N149AH - Jul 17, 11:00 UTCJul 17, 12:10 UTC1h 10m
2026-07-17 N149AH - Jul 17, 07:55 UTCJul 17, 09:15 UTC1h 20m
2026-07-17 N149AH - Jul 17, 01:25 UTCJul 17, 02:15 UTC50m
2026-07-17 N149AH - Jul 17, 00:25 UTCJul 17, 00:35 UTC10m
2026-07-16 N149AH - Jul 16, 23:25 UTCJul 16, 23:40 UTC15m
2026-07-16 N149AH - Jul 16, 15:14 UTCJul 16, 16:00 UTC45m
2026-07-16 N149AH - Jul 16, 12:49 UTCJul 16, 13:45 UTC55m
2026-07-16 N149AH - Jul 16, 02:10 UTCJul 16, 02:20 UTC10m
2026-07-16 N149AH - Jul 16, 01:25 UTCJul 16, 01:40 UTC15m

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 N149AH page for operator, model, and routing details .

Mode-S A0C427 frequently asked

What is Mode-S code A0C427?
A0C427 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N149AH.
Where is Mode-S A0C427 registered?
Mode-S code A0C427 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 A0C427 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 A0C427, octal 50142047, decimal 10,535,975.
What flights does A0C427 operate?
Mode-S A0C427 has broadcast 1 distinct callsign, including N149AH.