Apparatus

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sensors Mode-S transponder

ADF50D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N999LA · PIPER PA-44 Seminole · operated by AERO EQUITIES LLC

Hex
ADF50D
Octal
53372415
Decimal
11,400,461
Country
US
Tail
N999LA
Type
PA44
No current signal · last broadcast Jul 26, 17:30 UTC
Flights observed
68
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 17:30 UTC

Last known position

Most recent position reported by Mode-S ADF50D.

Country allocation

The ICAO 24-bit address ADF50D 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
N999LA - 68 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N999LA MYF → MYF Jul 26, 16:45 UTCJul 26, 17:30 UTC45m
2026-07-14 N999LA - Jul 14, 22:20 UTCJul 14, 23:50 UTC1h 29m
2026-07-14 N999LA - Jul 14, 20:05 UTCJul 14, 21:00 UTC55m
2026-07-14 N999LA - Jul 14, 16:25 UTCJul 14, 18:20 UTC1h 55m
2026-07-14 N999LA - Jul 14, 01:25 UTCJul 14, 03:00 UTC1h 35m
2026-07-12 N999LA MYF → MYF Jul 12, 22:10 UTCJul 12, 23:40 UTC1h 30m
2026-07-10 N999LA NKX → MYF Jul 10, 20:00 UTCJul 10, 21:35 UTC1h 35m
2026-07-09 N999LA - Jul 9, 23:45 UTCJul 10, 00:00 UTC15m
2026-07-09 N999LA - Jul 9, 22:35 UTCJul 9, 23:35 UTC1h 0m
2026-07-09 N999LA - Jul 9, 19:55 UTCJul 9, 21:20 UTC1h 25m
2026-06-29 N999LA BFL → MYF Jun 29, 23:25 UTCJun 30, 01:00 UTC1h 35m
2026-06-29 N999LA BFL → BFL Jun 29, 16:39 UTCJun 29, 17:45 UTC1h 5m
2026-06-29 N999LA BFL → BFL Jun 29, 14:09 UTCJun 29, 15:00 UTC50m
2026-06-28 N999LA - Jun 28, 21:55 UTCJun 28, 22:55 UTC1h 0m
2026-06-27 N999LA BFL → BFL Jun 27, 01:04 UTCJun 27, 01:54 UTC50m
2026-06-26 N999LA - Jun 26, 21:15 UTCJun 26, 21:55 UTC40m
2026-06-26 N999LA BFL → BFL Jun 26, 15:20 UTCJun 26, 16:09 UTC50m
2026-06-25 N999LA BFL → BFL Jun 25, 16:20 UTCJun 25, 17:09 UTC50m
2026-06-25 N999LA BFL → BFL Jun 25, 01:19 UTCJun 25, 03:04 UTC1h 45m
2026-06-24 N999LA BFL → BFL Jun 24, 18:39 UTCJun 24, 21:09 UTC2h 30m
2026-06-23 N999LA BFL → BFL Jun 23, 20:49 UTCJun 23, 22:19 UTC1h 30m
2026-06-23 N999LA BFL → BFL Jun 23, 16:09 UTCJun 23, 17:59 UTC1h 50m
2026-06-22 N999LA - Jun 22, 23:50 UTCJun 23, 00:04 UTC15m
2026-06-22 N999LA - Jun 22, 23:20 UTCJun 22, 23:35 UTC15m
2026-06-18 N999LA BFL → BFL Jun 18, 23:30 UTCJun 19, 00:20 UTC49m
2026-06-18 N999LA - Jun 18, 21:20 UTCJun 18, 22:25 UTC1h 5m
2026-06-18 N999LA - Jun 18, 17:15 UTCJun 18, 17:21 UTC6m
2026-06-18 N999LA BFL → BFL Jun 18, 16:20 UTCJun 18, 17:10 UTC50m
2026-06-17 N999LA - Jun 17, 22:10 UTCJun 17, 23:00 UTC50m
2026-06-17 N999LA BFL → BFL Jun 17, 18:45 UTCJun 17, 19:55 UTC1h 10m
2026-06-17 N999LA BFL → BFL Jun 17, 17:35 UTCJun 17, 17:45 UTC10m
2026-06-17 N999LA BFL → BFL Jun 17, 16:40 UTCJun 17, 17:30 UTC50m
2026-06-16 N999LA BFL → BFL Jun 16, 18:50 UTCJun 16, 19:15 UTC25m
2026-06-16 N999LA BFL → BFL Jun 16, 16:15 UTCJun 16, 17:19 UTC1h 5m
2026-06-16 N999LA BFL → BFL Jun 16, 14:15 UTCJun 16, 14:50 UTC35m
2026-06-16 N999LA - Jun 16, 01:19 UTCJun 16, 02:15 UTC55m
2026-06-15 N999LA BFL → BFL Jun 15, 18:35 UTCJun 15, 19:25 UTC50m
2026-06-15 N999LA BFL → BFL Jun 15, 15:55 UTCJun 15, 16:40 UTC45m
2026-06-11 N999LA BFL → BFL Jun 11, 21:20 UTCJun 11, 22:15 UTC55m
2026-06-11 N999LA BFL → BFL Jun 11, 18:35 UTCJun 11, 19:50 UTC1h 15m
2026-06-11 N999LA BFL → BFL Jun 11, 14:20 UTCJun 11, 15:00 UTC40m
2026-05-21 N999LA BFL → BFL May 21, 23:10 UTCMay 22, 00:15 UTC1h 5m
2026-05-20 N999LA - May 20, 16:35 UTCMay 20, 17:20 UTC45m
2026-05-19 N999LA BFL → BFL May 19, 23:05 UTCMay 20, 00:30 UTC1h 25m
2026-05-19 N999LA CRO → BFL May 19, 21:05 UTCMay 19, 21:35 UTC30m
2026-05-19 N999LA - May 19, 19:10 UTCMay 19, 19:35 UTC25m
2026-05-18 N999LA BFL → BFL May 18, 19:00 UTCMay 18, 19:45 UTC45m
2026-05-18 N999LA BFL → BFL May 18, 16:15 UTCMay 18, 17:20 UTC1h 5m
2026-05-14 N999LA - May 14, 18:15 UTCMay 14, 18:55 UTC40m
2026-05-13 N999LA - May 13, 20:55 UTCMay 13, 21:45 UTC50m

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 N999LA page for operator, model, and routing details .

Mode-S ADF50D frequently asked

What is Mode-S code ADF50D?
ADF50D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N999LA.
Where is Mode-S ADF50D registered?
Mode-S code ADF50D 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 ADF50D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADF50D, octal 53372415, decimal 11,400,461.
What flights does ADF50D operate?
Mode-S ADF50D has broadcast 1 distinct callsign, including N999LA.