Apparatus

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sensors Mode-S transponder

AC7321

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N901CM · AGUSTA AW-109 Grand · operated by LIFEFLIGHT OF MAINE LLC

Hex
AC7321
Octal
53071441
Decimal
11,301,665
Country
US
Tail
N901CM
Type
A109
No current signal · last broadcast Jul 25, 16:20 UTC
Flights observed
61
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 16:20 UTC

Last known position

Most recent position reported by Mode-S AC7321.

Country allocation

The ICAO 24-bit address AC7321 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
N901CM - 61 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N901CM - Jul 25, 16:05 UTCJul 25, 16:20 UTC15m
2026-07-25 N901CM - Jul 25, 15:10 UTCJul 25, 15:20 UTC10m
2026-07-25 N901CM BGR → BGR Jul 25, 14:05 UTCJul 25, 14:55 UTC50m
2026-07-25 N901CM - Jul 25, 13:05 UTCJul 25, 13:40 UTC35m
2026-07-25 N901CM - Jul 25, 09:50 UTCJul 25, 10:05 UTC15m
2026-07-25 N901CM - Jul 25, 07:25 UTCJul 25, 08:05 UTC40m
2026-07-25 N901CM - Jul 25, 05:55 UTCJul 25, 06:20 UTC25m
2026-07-25 N901CM - Jul 25, 04:20 UTCJul 25, 04:55 UTC35m
2026-07-12 N901CM - Jul 12, 07:31 UTCJul 12, 07:40 UTC10m
2026-07-12 N901CM - Jul 12, 06:15 UTCJul 12, 06:25 UTC10m
2026-07-12 N901CM - Jul 12, 05:01 UTCJul 12, 05:10 UTC10m
2026-07-12 N901CM - Jul 12, 04:35 UTCJul 12, 04:45 UTC10m
2026-07-05 N901CM - Jul 5, 17:15 UTCJul 5, 17:30 UTC15m
2026-07-05 N901CM - Jul 5, 16:00 UTCJul 5, 16:35 UTC35m
2026-07-04 N901CM - Jul 4, 21:40 UTCJul 4, 22:05 UTC25m
2026-07-04 N901CM - Jul 4, 20:10 UTCJul 4, 20:35 UTC25m
2026-07-01 N901CM - Jul 1, 22:05 UTCJul 1, 22:15 UTC10m
2026-07-01 N901CM - Jul 1, 05:00 UTCJul 1, 05:10 UTC10m
2026-06-22 N901CM - Jun 22, 17:25 UTCJun 22, 17:55 UTC30m
2026-06-22 N901CM - Jun 22, 16:10 UTCJun 22, 16:34 UTC25m
2026-06-21 N901CM - Jun 21, 05:35 UTCJun 21, 05:59 UTC25m
2026-06-21 N901CM - Jun 21, 03:25 UTCJun 21, 05:00 UTC1h 35m
2026-06-21 N901CM - Jun 21, 03:05 UTCJun 21, 03:14 UTC10m
2026-06-21 N901CM - Jun 21, 01:35 UTCJun 21, 01:49 UTC15m
2026-06-21 N901CM - Jun 21, 01:10 UTCJun 21, 01:19 UTC10m
2026-06-20 N901CM - Jun 20, 21:34 UTCJun 20, 22:54 UTC1h 20m
2026-06-17 N901CM - Jun 17, 15:46 UTCJun 17, 15:55 UTC10m
2026-06-17 N901CM - Jun 17, 14:40 UTCJun 17, 14:50 UTC10m
2026-06-17 N901CM - Jun 17, 13:30 UTCJun 17, 13:50 UTC20m
2026-06-08 N901CM - Jun 8, 21:20 UTCJun 8, 22:35 UTC1h 15m
2026-06-07 N901CM - Jun 7, 09:00 UTCJun 7, 09:20 UTC20m
2026-06-07 N901CM - Jun 7, 08:00 UTCJun 7, 08:25 UTC25m
2026-06-06 N901CM - Jun 6, 06:25 UTCJun 6, 06:45 UTC20m
2026-06-06 N901CM - Jun 6, 05:25 UTCJun 6, 05:45 UTC20m
2026-06-05 N901CM - Jun 5, 11:00 UTCJun 5, 11:40 UTC40m
2026-06-05 N901CM - Jun 5, 10:20 UTCJun 5, 10:25 UTC5m
2026-06-05 N901CM - Jun 5, 09:15 UTCJun 5, 09:45 UTC30m
2026-06-04 N901CM - Jun 4, 21:40 UTCJun 4, 22:10 UTC30m
2026-06-03 N901CM - Jun 3, 08:10 UTCJun 3, 08:35 UTC25m
2026-06-03 N901CM - Jun 3, 07:15 UTCJun 3, 07:35 UTC20m
2026-06-03 N901CM - Jun 3, 03:45 UTCJun 3, 04:05 UTC20m
2026-06-03 N901CM - Jun 3, 03:00 UTCJun 3, 03:10 UTC10m
2026-06-03 N901CM - Jun 3, 01:55 UTCJun 3, 02:05 UTC10m
2026-05-30 N901CM - May 30, 22:55 UTCMay 30, 23:05 UTC10m
2026-05-30 N901CM - May 30, 21:25 UTCMay 30, 21:35 UTC10m
2026-05-27 N901CM - May 27, 02:49 UTCMay 27, 03:50 UTC1h 0m
2026-05-27 N901CM - May 27, 01:49 UTCMay 27, 01:59 UTC10m
2026-05-24 N901CM - May 24, 19:40 UTCMay 24, 19:50 UTC10m
2026-05-18 N901CM - May 18, 18:55 UTCMay 18, 19:10 UTC15m
2026-05-18 N901CM - May 18, 07:50 UTCMay 18, 07:55 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 N901CM page for operator, model, and routing details .

Mode-S AC7321 frequently asked

What is Mode-S code AC7321?
AC7321 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N901CM.
Where is Mode-S AC7321 registered?
Mode-S code AC7321 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 AC7321 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 16:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC7321, octal 53071441, decimal 11,301,665.
What flights does AC7321 operate?
Mode-S AC7321 has broadcast 1 distinct callsign, including N901CM.