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sensors Mode-S transponder

AC741B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N901NM · BELL 407 · operated by AIR METHODS LLC

Hex
AC741B
Octal
53072033
Decimal
11,301,915
Country
US
Tail
N901NM
Type
B407
No current signal · last broadcast 14d ago
Flights observed
234
Distinct callsigns
1
Country
US
Last broadcast
14d ago

Last known position

Most recent position reported by Mode-S AC741B.

Country allocation

The ICAO 24-bit address AC741B 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
N901NM - 234 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N901NM - Jul 24, 18:40 UTCJul 24, 18:45 UTC5m
2026-07-24 N901NM - Jul 24, 17:05 UTCJul 24, 17:40 UTC35m
2026-07-24 N901NM - Jul 24, 15:25 UTCJul 24, 16:25 UTC1h 0m
2026-07-23 N901NM - Jul 23, 22:45 UTCJul 23, 22:55 UTC10m
2026-07-23 N901NM - Jul 23, 20:15 UTCJul 23, 20:50 UTC35m
2026-07-23 N901NM - Jul 23, 18:00 UTCJul 23, 18:55 UTC55m
2026-07-23 N901NM - Jul 23, 16:55 UTCJul 23, 17:10 UTC15m
2026-07-23 N901NM - Jul 23, 08:35 UTCJul 23, 08:55 UTC20m
2026-07-23 N901NM - Jul 23, 06:45 UTCJul 23, 06:55 UTC10m
2026-07-23 N901NM - Jul 23, 04:40 UTCJul 23, 05:00 UTC20m
2026-07-22 N901NM - Jul 22, 02:45 UTCJul 22, 03:05 UTC20m
2026-07-21 N901NM - Jul 21, 23:45 UTCJul 22, 00:35 UTC50m
2026-07-21 N901NM - Jul 21, 19:35 UTCJul 21, 20:25 UTC50m
2026-07-21 N901NM - Jul 21, 00:50 UTCJul 21, 01:15 UTC25m
2026-07-21 N901NM - Jul 21, 00:10 UTCJul 21, 00:20 UTC10m
2026-07-20 N901NM - Jul 20, 22:30 UTCJul 20, 23:10 UTC40m
2026-07-20 N901NM - Jul 20, 02:15 UTCJul 20, 03:05 UTC50m
2026-07-20 N901NM - Jul 20, 00:55 UTCJul 20, 01:40 UTC45m
2026-07-19 N901NM - Jul 19, 22:30 UTCJul 19, 23:25 UTC55m
2026-07-19 N901NM - Jul 19, 18:10 UTCJul 19, 18:20 UTC10m
2026-07-19 N901NM - Jul 19, 15:35 UTCJul 19, 17:35 UTC2h 0m
2026-07-18 N901NM - Jul 18, 01:50 UTCJul 18, 02:00 UTC10m
2026-07-18 N901NM - Jul 18, 01:05 UTCJul 18, 01:15 UTC10m
2026-07-17 N901NM - Jul 17, 13:40 UTCJul 17, 13:55 UTC15m
2026-07-17 N901NM - Jul 17, 11:00 UTCJul 17, 11:10 UTC10m
2026-07-16 N901NM - Jul 16, 04:25 UTCJul 16, 04:35 UTC10m
2026-07-16 N901NM - Jul 16, 03:45 UTCJul 16, 03:50 UTC5m
2026-07-16 N901NM - Jul 16, 02:40 UTCJul 16, 03:00 UTC20m
2026-07-16 N901NM - Jul 16, 00:50 UTCJul 16, 01:20 UTC30m
2026-07-16 N901NM - Jul 16, 00:05 UTCJul 16, 00:15 UTC10m
2026-07-13 N901NM - Jul 13, 22:20 UTCJul 13, 22:50 UTC30m
2026-07-13 N901NM - Jul 13, 20:00 UTCJul 13, 20:20 UTC20m
2026-07-13 N901NM - Jul 13, 18:45 UTCJul 13, 19:00 UTC15m
2026-07-13 N901NM - Jul 13, 02:30 UTCJul 13, 02:40 UTC10m
2026-07-12 N901NM - Jul 12, 22:55 UTCJul 12, 23:15 UTC20m
2026-07-12 N901NM - Jul 12, 22:05 UTCJul 12, 22:15 UTC10m
2026-07-12 N901NM - Jul 12, 04:40 UTCJul 12, 05:25 UTC45m
2026-07-12 N901NM - Jul 12, 03:45 UTCJul 12, 04:01 UTC15m
2026-07-12 N901NM - Jul 12, 03:01 UTCJul 12, 03:15 UTC14m
2026-07-10 N901NM - Jul 10, 19:25 UTCJul 10, 20:00 UTC35m
2026-07-10 N901NM - Jul 10, 18:20 UTCJul 10, 19:05 UTC45m
2026-07-10 N901NM - Jul 10, 17:30 UTCJul 10, 17:40 UTC10m
2026-07-10 N901NM - Jul 10, 14:35 UTCJul 10, 15:25 UTC50m
2026-07-08 N901NM - Jul 8, 22:45 UTCJul 8, 23:45 UTC1h 0m
2026-07-08 N901NM - Jul 8, 21:25 UTCJul 8, 21:40 UTC15m
2026-07-08 N901NM - Jul 8, 20:05 UTCJul 8, 20:20 UTC15m
2026-07-07 N901NM - Jul 7, 23:25 UTCJul 8, 00:25 UTC1h 0m
2026-07-07 N901NM - Jul 7, 22:25 UTCJul 7, 22:40 UTC15m
2026-07-07 N901NM - Jul 7, 21:35 UTCJul 7, 21:50 UTC15m
2026-07-07 N901NM - Jul 7, 03:25 UTCJul 7, 03:35 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 N901NM page for operator, model, and routing details .

Mode-S AC741B frequently asked

What is Mode-S code AC741B?
AC741B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N901NM.
Where is Mode-S AC741B registered?
Mode-S code AC741B 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 AC741B broadcasting right now?
No active broadcast right now. Last signal was 14d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC741B, octal 53072033, decimal 11,301,915.
What flights does AC741B operate?
Mode-S AC741B has broadcast 1 distinct callsign, including N901NM.