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sensors Mode-S transponder

AD2491

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N946MM · DASSAULT Falcon 2000 · operated by HEATHROW ENTERPRISES LLC

Hex
AD2491
Octal
53222221
Decimal
11,347,089
Country
US
Tail
N946MM
Type
F2TH
No current signal · last broadcast 12h ago
Flights observed
48
Distinct callsigns
1
Country
US
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S AD2491.

Country allocation

The ICAO 24-bit address AD2491 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
N946MM - 48 2026-07-13

Recent flights last 48

DateFlightRouteTakeoffLandingDuration
2026-07-13 N946MM - Jul 13, 20:05 UTCJul 13, 22:40 UTC2h 35m
2026-07-13 N946MM - Jul 13, 15:15 UTCJul 13, 18:45 UTC3h 30m
2026-07-13 N946MM - Jul 13, 13:25 UTCJul 13, 13:45 UTC20m
2026-07-12 N946MM - Jul 12, 03:25 UTCJul 12, 03:40 UTC15m
2026-07-12 N946MM - Jul 12, 02:01 UTCJul 12, 02:55 UTC55m
2026-07-12 N946MM - Jul 12, 00:45 UTCJul 12, 01:25 UTC40m
2026-07-11 N946MM - Jul 11, 22:30 UTCJul 12, 00:10 UTC1h 40m
2026-07-11 N946MM - Jul 11, 10:45 UTCJul 11, 12:30 UTC1h 45m
2026-07-10 N946MM - Jul 10, 15:50 UTCJul 10, 16:10 UTC20m
2026-07-06 N946MM - Jul 6, 23:30 UTCJul 6, 23:50 UTC20m
2026-07-06 N946MM - Jul 6, 19:00 UTCJul 6, 22:10 UTC3h 10m
2026-07-06 N946MM - Jul 6, 13:25 UTCJul 6, 17:00 UTC3h 35m
2026-07-06 N946MM - Jul 6, 11:30 UTCJul 6, 12:00 UTC30m
2026-07-01 N946MM - Jul 1, 14:20 UTCJul 1, 17:30 UTC3h 10m
2026-07-01 N946MM - Jul 1, 13:10 UTCJul 1, 13:40 UTC30m
2026-06-30 N946MM - Jun 30, 18:10 UTCJun 30, 20:40 UTC2h 30m
2026-06-30 N946MM - Jun 30, 14:05 UTCJun 30, 16:30 UTC2h 25m
2026-06-28 N946MM TEB → BED Jun 28, 14:14 UTCJun 28, 14:59 UTC45m
2026-06-26 N946MM ORL → TEB Jun 26, 13:30 UTCJun 26, 15:39 UTC2h 10m
2026-06-26 N946MM - Jun 26, 11:14 UTCJun 26, 11:34 UTC20m
2026-06-18 N946MM - Jun 18, 02:05 UTCJun 18, 02:20 UTC15m
2026-06-18 N946MM - Jun 18, 01:05 UTCJun 18, 01:40 UTC35m
2026-06-17 N946MM - Jun 17, 16:00 UTCJun 17, 16:10 UTC10m
2026-06-17 N946MM - Jun 17, 11:55 UTCJun 17, 12:35 UTC40m
2026-06-16 N946MM - Jun 16, 21:15 UTCJun 16, 21:30 UTC15m
2026-06-16 N946MM - Jun 16, 19:05 UTCJun 16, 19:45 UTC40m
2026-06-16 N946MM - Jun 16, 16:20 UTCJun 16, 16:55 UTC35m
2026-06-15 N946MM - Jun 15, 19:35 UTCJun 15, 20:15 UTC40m
2026-06-15 N946MM SFB → OPF Jun 15, 12:45 UTCJun 15, 13:25 UTC40m
2026-06-15 N946MM - Jun 15, 10:55 UTCJun 15, 11:15 UTC20m
2026-06-13 N946MM - Jun 13, 01:05 UTCJun 13, 01:15 UTC10m
2026-06-12 N946MM - Jun 12, 23:20 UTCJun 13, 00:45 UTC1h 25m
2026-06-12 N946MM - Jun 12, 14:30 UTCJun 12, 15:45 UTC1h 15m
2026-06-11 N946MM LAS → SFB Jun 11, 16:15 UTCJun 11, 20:00 UTC3h 45m
2026-06-08 N946MM - Jun 8, 16:25 UTCJun 8, 20:45 UTC4h 20m
2026-06-07 N946MM - Jun 7, 18:30 UTCJun 7, 18:45 UTC15m
2026-06-07 N946MM - Jun 7, 16:50 UTCJun 7, 17:55 UTC1h 5m
2026-06-05 N946MM - Jun 5, 18:05 UTCJun 5, 19:15 UTC1h 10m
2026-06-05 N946MM - Jun 5, 17:00 UTCJun 5, 17:15 UTC15m
2026-05-24 N946MM - May 24, 16:05 UTCMay 24, 16:20 UTC15m
2026-05-24 N946MM - May 24, 14:20 UTCMay 24, 15:45 UTC1h 25m
2026-05-24 N946MM - May 24, 12:10 UTCMay 24, 13:20 UTC1h 10m
2026-05-21 N946MM - May 21, 15:35 UTCMay 21, 16:45 UTC1h 10m
2026-05-21 N946MM - May 21, 13:40 UTCMay 21, 15:00 UTC1h 20m
2026-05-20 N946MM PNS → ORL May 20, 00:00 UTCMay 20, 01:00 UTC1h 0m
2026-05-19 N946MM ORL → PNS May 19, 14:40 UTCMay 19, 15:50 UTC1h 10m
2026-05-19 N946MM - May 19, 13:35 UTCMay 19, 13:55 UTC20m
2026-05-14 N946MM - May 14, 22:15 UTCMay 15, 00:20 UTC2h 5m

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 N946MM page for operator, model, and routing details .

Mode-S AD2491 frequently asked

What is Mode-S code AD2491?
AD2491 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N946MM.
Where is Mode-S AD2491 registered?
Mode-S code AD2491 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 AD2491 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD2491, octal 53222221, decimal 11,347,089.
What flights does AD2491 operate?
Mode-S AD2491 has broadcast 1 distinct callsign, including N946MM.