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sensors Mode-S transponder

A4CF16

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N409LM · BELL 407 · operated by AIR METHODS LLC

Hex
A4CF16
Octal
51147426
Decimal
10,800,918
Country
US
Tail
N409LM
Type
B407
No current signal · last broadcast Jul 26, 18:20 UTC
Flights observed
256
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 18:20 UTC

Last known position

Most recent position reported by Mode-S A4CF16.

Country allocation

The ICAO 24-bit address A4CF16 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
N409LM - 256 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N409LM - Jul 26, 18:10 UTCJul 26, 18:20 UTC10m
2026-07-26 N409LM - Jul 26, 06:40 UTCJul 26, 07:15 UTC35m
2026-07-26 N409LM - Jul 26, 05:40 UTCJul 26, 06:10 UTC30m
2026-07-24 N409LM - Jul 24, 22:05 UTCJul 24, 22:35 UTC30m
2026-07-24 N409LM - Jul 24, 18:00 UTCJul 24, 18:30 UTC30m
2026-07-24 N409LM - Jul 24, 16:40 UTCJul 24, 17:15 UTC35m
2026-07-24 N409LM - Jul 24, 10:15 UTCJul 24, 11:55 UTC1h 40m
2026-07-24 N409LM - Jul 24, 06:45 UTCJul 24, 07:25 UTC40m
2026-07-24 N409LM - Jul 24, 05:40 UTCJul 24, 06:10 UTC30m
2026-07-24 N409LM - Jul 24, 02:50 UTCJul 24, 03:35 UTC45m
2026-07-24 N409LM - Jul 24, 01:40 UTCJul 24, 02:10 UTC30m
2026-07-19 N409LM - Jul 19, 20:30 UTCJul 19, 20:45 UTC15m
2026-07-19 N409LM - Jul 19, 16:40 UTCJul 19, 17:00 UTC20m
2026-07-19 N409LM - Jul 19, 09:15 UTCJul 19, 09:50 UTC35m
2026-07-19 N409LM - Jul 19, 08:20 UTCJul 19, 08:55 UTC35m
2026-07-19 N409LM - Jul 19, 01:30 UTCJul 19, 01:50 UTC20m
2026-07-19 N409LM - Jul 19, 00:45 UTCJul 19, 00:55 UTC10m
2026-07-18 N409LM - Jul 18, 07:15 UTCJul 18, 07:45 UTC30m
2026-07-18 N409LM - Jul 18, 05:25 UTCJul 18, 06:30 UTC1h 5m
2026-07-17 N409LM - Jul 17, 09:30 UTCJul 17, 10:05 UTC35m
2026-07-17 N409LM - Jul 17, 08:25 UTCJul 17, 08:54 UTC30m
2026-07-16 N409LM - Jul 16, 11:25 UTCJul 16, 11:45 UTC20m
2026-07-16 N409LM - Jul 16, 02:55 UTCJul 16, 03:35 UTC40m
2026-07-16 N409LM - Jul 16, 01:45 UTCJul 16, 02:25 UTC40m
2026-07-16 N409LM - Jul 16, 00:35 UTCJul 16, 01:20 UTC45m
2026-07-15 N409LM - Jul 15, 23:10 UTCJul 15, 23:40 UTC30m
2026-07-15 N409LM - Jul 15, 21:55 UTCJul 15, 22:20 UTC25m
2026-07-13 N409LM - Jul 13, 23:00 UTCJul 13, 23:30 UTC30m
2026-07-13 N409LM - Jul 13, 21:50 UTCJul 13, 22:20 UTC30m
2026-07-11 N409LM - Jul 11, 23:50 UTCJul 12, 00:25 UTC35m
2026-07-11 N409LM - Jul 11, 22:15 UTCJul 11, 22:50 UTC35m
2026-07-11 N409LM - Jul 11, 20:50 UTCJul 11, 21:30 UTC40m
2026-07-11 N409LM - Jul 11, 19:40 UTCJul 11, 20:15 UTC35m
2026-07-11 N409LM - Jul 11, 02:40 UTCJul 11, 03:10 UTC30m
2026-07-11 N409LM - Jul 11, 01:05 UTCJul 11, 02:10 UTC1h 5m
2026-07-10 N409LM - Jul 10, 23:55 UTCJul 11, 00:25 UTC30m
2026-07-10 N409LM - Jul 10, 11:55 UTCJul 10, 12:30 UTC35m
2026-07-10 N409LM - Jul 10, 10:55 UTCJul 10, 11:25 UTC30m
2026-07-09 N409LM - Jul 9, 18:50 UTCJul 9, 19:25 UTC35m
2026-07-09 N409LM - Jul 9, 18:10 UTCJul 9, 18:20 UTC10m
2026-07-09 N409LM - Jul 9, 16:35 UTCJul 9, 17:40 UTC1h 5m
2026-07-09 N409LM - Jul 9, 09:05 UTCJul 9, 09:30 UTC25m
2026-07-09 N409LM - Jul 9, 07:10 UTCJul 9, 07:45 UTC35m
2026-07-09 N409LM - Jul 9, 06:05 UTCJul 9, 06:35 UTC30m
2026-07-09 N409LM - Jul 9, 03:10 UTCJul 9, 03:40 UTC30m
2026-07-09 N409LM - Jul 9, 01:35 UTCJul 9, 02:35 UTC1h 0m
2026-07-08 N409LM - Jul 8, 22:35 UTCJul 8, 23:10 UTC35m
2026-07-08 N409LM - Jul 8, 21:00 UTCJul 8, 21:30 UTC30m
2026-07-08 N409LM - Jul 8, 19:40 UTCJul 8, 20:10 UTC30m
2026-07-08 N409LM - Jul 8, 18:40 UTCJul 8, 19:10 UTC30m

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 N409LM page for operator, model, and routing details .

Mode-S A4CF16 frequently asked

What is Mode-S code A4CF16?
A4CF16 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N409LM.
Where is Mode-S A4CF16 registered?
Mode-S code A4CF16 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 A4CF16 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4CF16, octal 51147426, decimal 10,800,918.
What flights does A4CF16 operate?
Mode-S A4CF16 has broadcast 1 distinct callsign, including N409LM.