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sensors Mode-S transponder

AC73E9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N901LM · BEECH 200 Super King Air · operated by LIFEFLIGHT OF MAINE LLC

Hex
AC73E9
Octal
53071751
Decimal
11,301,865
Country
US
Tail
N901LM
Type
BE20
No current signal · last broadcast 1h ago
Flights observed
244
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AC73E9.

Country allocation

The ICAO 24-bit address AC73E9 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
N901LM - 244 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 N901LM - Jul 21, 02:50 UTCJul 21, 03:20 UTC30m
2026-07-20 N901LM PQI → BGR Jul 20, 06:55 UTCJul 20, 07:30 UTC35m
2026-07-20 N901LM BGR → PQI Jul 20, 05:05 UTCJul 20, 05:40 UTC35m
2026-07-18 N901LM BGR → BGR Jul 18, 23:25 UTCJul 18, 23:30 UTC5m
2026-07-18 N901LM - Jul 18, 08:40 UTCJul 18, 09:45 UTC1h 5m
2026-07-18 N901LM - Jul 18, 06:45 UTCJul 18, 07:20 UTC35m
2026-07-18 N901LM - Jul 18, 05:55 UTCJul 18, 06:10 UTC15m
2026-07-17 N901LM - Jul 17, 16:04 UTCJul 17, 16:34 UTC30m
2026-07-17 N901LM - Jul 17, 14:35 UTCJul 17, 15:10 UTC35m
2026-07-17 N901LM PQI → BGR Jul 17, 09:04 UTCJul 17, 09:35 UTC30m
2026-07-17 N901LM BGR → PQI Jul 17, 07:30 UTCJul 17, 08:04 UTC35m
2026-07-17 N901LM BOS → BGR Jul 17, 03:39 UTCJul 17, 04:25 UTC45m
2026-07-17 N901LM BGR → BOS Jul 17, 00:35 UTCJul 17, 01:20 UTC45m
2026-07-15 N901LM - Jul 15, 20:30 UTCJul 15, 21:05 UTC35m
2026-07-15 N901LM - Jul 15, 19:15 UTCJul 15, 19:45 UTC30m
2026-07-15 N901LM - Jul 15, 04:15 UTCJul 15, 04:50 UTC35m
2026-07-15 N901LM - Jul 15, 01:15 UTCJul 15, 01:50 UTC35m
2026-07-14 N901LM - Jul 14, 20:45 UTCJul 14, 21:15 UTC30m
2026-07-14 N901LM - Jul 14, 19:10 UTCJul 14, 19:45 UTC35m
2026-07-14 N901LM RDU → BGR Jul 14, 09:05 UTCJul 14, 12:00 UTC2h 55m
2026-07-14 N901LM - Jul 14, 03:40 UTCJul 14, 06:10 UTC2h 30m
2026-07-14 N901LM BGR → RKD Jul 14, 00:45 UTCJul 14, 01:05 UTC20m
2026-07-12 N901LM - Jul 12, 09:55 UTCJul 12, 10:20 UTC25m
2026-07-12 N901LM - Jul 12, 07:40 UTCJul 12, 08:05 UTC25m
2026-07-12 N901LM BGR → MLT Jul 12, 06:25 UTCJul 12, 06:45 UTC20m
2026-07-11 N901LM - Jul 11, 16:35 UTCJul 11, 17:10 UTC35m
2026-07-11 N901LM - Jul 11, 14:50 UTCJul 11, 15:40 UTC50m
2026-07-11 N901LM - Jul 11, 11:40 UTCJul 11, 11:45 UTC5m
2026-07-09 N901LM BGR → BGR Jul 9, 22:00 UTCJul 9, 22:05 UTC5m
2026-07-08 N901LM BGR → BGR Jul 8, 21:50 UTCJul 8, 21:55 UTC5m
2026-07-08 N901LM BED → BGR Jul 8, 11:30 UTCJul 8, 12:25 UTC55m
2026-07-08 N901LM MLT → BED Jul 8, 08:00 UTCJul 8, 08:55 UTC55m
2026-07-08 N901LM BGR → MLT Jul 8, 06:35 UTCJul 8, 07:00 UTC25m
2026-07-07 N901LM - Jul 7, 15:25 UTCJul 7, 15:30 UTC5m
2026-07-07 N901LM BGR → BGR Jul 7, 12:45 UTCJul 7, 12:55 UTC10m
2026-07-07 N901LM BGR → BGR Jul 7, 12:20 UTCJul 7, 12:25 UTC5m
2026-07-06 N901LM BGR → BGR Jul 6, 11:20 UTCJul 6, 11:35 UTC15m
2026-06-26 N901LM BGR → BGR Jun 26, 19:09 UTCJun 26, 19:14 UTC5m
2026-06-20 N901LM BGR → BGR Jun 20, 14:54 UTCJun 20, 15:04 UTC10m
2026-06-19 N901LM BGR → BGR Jun 19, 16:29 UTCJun 19, 17:09 UTC40m
2026-06-19 N901LM BGR → BGR Jun 19, 14:09 UTCJun 19, 15:39 UTC1h 30m
2026-06-19 N901LM BGR → BGR Jun 19, 13:14 UTCJun 19, 13:24 UTC10m
2026-06-14 N901LM - Jun 14, 22:00 UTCJun 14, 22:20 UTC20m
2026-06-14 N901LM - Jun 14, 20:55 UTCJun 14, 21:10 UTC15m
2026-06-14 N901LM - Jun 14, 16:35 UTCJun 14, 17:10 UTC35m
2026-06-14 N901LM - Jun 14, 14:45 UTCJun 14, 15:30 UTC45m
2026-06-14 N901LM - Jun 14, 13:40 UTCJun 14, 13:50 UTC10m
2026-06-14 N901LM BOS → BGR Jun 14, 05:25 UTCJun 14, 06:10 UTC45m
2026-06-14 N901LM BGR → BOS Jun 14, 03:05 UTCJun 14, 03:55 UTC50m
2026-06-13 N901LM - Jun 13, 22:50 UTCJun 13, 23:00 UTC10m

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 N901LM page for operator, model, and routing details .

Mode-S AC73E9 frequently asked

What is Mode-S code AC73E9?
AC73E9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N901LM.
Where is Mode-S AC73E9 registered?
Mode-S code AC73E9 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 AC73E9 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC73E9, octal 53071751, decimal 11,301,865.
What flights does AC73E9 operate?
Mode-S AC73E9 has broadcast 1 distinct callsign, including N901LM.