sensors Mode-S transponder

A1D499

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N217MC · operated by CHRISTIAN MORRIS

Hex
A1D499
Octal
50352231
Decimal
10,605,721
Country
US
Tail
N217MC
No current signal · last broadcast 15d ago
Flights observed
42
Distinct callsigns
1
Country
US
Last broadcast
15d ago

Last known position

Most recent position reported by Mode-S A1D499.

Country allocation

The ICAO 24-bit address A1D499 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
N217MC - 42 2026-06-28

Recent flights last 42

DateFlightRouteTakeoffLandingDuration
2026-06-28 N217MC TPA → FXE Jun 28, 11:45 UTCJun 28, 13:04 UTC1h 20m
2026-06-27 N217MC - Jun 27, 21:10 UTCJun 27, 22:25 UTC1h 15m
2026-06-26 N217MC - Jun 26, 17:15 UTCJun 26, 18:04 UTC50m
2026-06-22 N217MC FXE → FXE Jun 22, 13:49 UTCJun 22, 15:54 UTC2h 5m
2026-06-21 N217MC - Jun 21, 15:30 UTCJun 21, 15:54 UTC25m
2026-06-16 N217MC - Jun 16, 14:45 UTCJun 16, 15:30 UTC45m
2026-06-13 N217MC - Jun 13, 15:10 UTCJun 13, 16:05 UTC55m
2026-06-13 N217MC - Jun 13, 13:55 UTCJun 13, 14:15 UTC20m
2026-06-11 N217MC - Jun 11, 18:15 UTCJun 11, 18:40 UTC25m
2026-06-11 N217MC - Jun 11, 14:45 UTCJun 11, 15:15 UTC30m
2026-05-27 N217MC TMB → FXE May 27, 23:25 UTCMay 27, 23:55 UTC30m
2026-05-25 N217MC - May 25, 19:59 UTCMay 25, 20:24 UTC25m
2026-05-25 N217MC - May 25, 18:25 UTCMay 25, 18:45 UTC20m
2026-05-25 N217MC - May 25, 16:45 UTCMay 25, 16:55 UTC10m
2026-05-24 N217MC - May 24, 21:05 UTCMay 24, 21:30 UTC25m
2026-05-24 N217MC - May 24, 19:35 UTCMay 24, 20:30 UTC55m
2026-05-21 N217MC - May 21, 20:55 UTCMay 21, 22:00 UTC1h 5m
2026-05-21 N217MC FXE → VRB May 21, 18:45 UTCMay 21, 19:35 UTC50m
2026-05-17 N217MC - May 17, 16:35 UTCMay 17, 18:25 UTC1h 50m
2026-05-17 N217MC - May 17, 13:35 UTCMay 17, 15:15 UTC1h 40m
2026-05-15 N217MC - May 15, 20:20 UTCMay 15, 21:55 UTC1h 35m
2026-05-15 N217MC - May 15, 18:30 UTCMay 15, 19:10 UTC40m
2026-05-15 N217MC - May 15, 14:15 UTCMay 15, 16:35 UTC2h 19m
2026-04-27 N217MC - Apr 27, 00:00 UTCApr 27, 00:15 UTC15m
2026-04-26 N217MC - Apr 26, 21:20 UTCApr 26, 22:30 UTC1h 10m
2026-04-26 N217MC - Apr 26, 20:40 UTCApr 26, 21:15 UTC35m
2026-04-26 N217MC - Apr 26, 17:30 UTCApr 26, 19:55 UTC2h 25m
2026-04-26 N217MC - Apr 26, 13:30 UTCApr 26, 14:05 UTC35m
2026-04-24 N217MC - Apr 24, 19:50 UTCApr 24, 21:05 UTC1h 15m
2026-04-22 N217MC - Apr 22, 20:15 UTCApr 22, 21:25 UTC1h 10m
2026-04-21 N217MC - Apr 21, 21:40 UTCApr 21, 22:40 UTC1h 0m
2026-04-21 N217MC - Apr 21, 20:25 UTCApr 21, 20:45 UTC20m
2026-04-21 N217MC - Apr 21, 18:55 UTCApr 21, 19:05 UTC10m
2026-04-21 N217MC - Apr 21, 17:05 UTCApr 21, 18:10 UTC1h 5m
2026-04-19 N217MC - Apr 19, 22:55 UTCApr 19, 23:10 UTC15m
2026-04-19 N217MC - Apr 19, 20:35 UTCApr 19, 21:20 UTC45m
2026-04-18 N217MC - Apr 18, 16:25 UTCApr 18, 16:45 UTC20m
2026-04-18 N217MC - Apr 18, 14:10 UTCApr 18, 14:25 UTC15m
2026-04-17 N217MC - Apr 17, 19:25 UTCApr 17, 19:40 UTC15m
2026-04-17 N217MC - Apr 17, 18:25 UTCApr 17, 19:15 UTC50m
2026-04-17 N217MC - Apr 17, 16:05 UTCApr 17, 17:15 UTC1h 10m
2026-04-12 N217MC - Apr 12, 17:15 UTCApr 12, 17:40 UTC25m

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 N217MC page for operator, model, and routing details .

Mode-S A1D499 frequently asked

What is Mode-S code A1D499?
A1D499 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N217MC.
Where is Mode-S A1D499 registered?
Mode-S code A1D499 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 A1D499 broadcasting right now?
No active broadcast right now. Last signal was 15d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1D499, octal 50352231, decimal 10,605,721.
What flights does A1D499 operate?
Mode-S A1D499 has broadcast 1 distinct callsign, including N217MC.