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sensors Mode-S transponder

AD4A1D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N95539 · CESSNA 152 · operated by HILLSBORO AERO ACADEMY LLC

Hex
AD4A1D
Octal
53245035
Decimal
11,356,701
Country
US
Tail
N95539
Type
C152
No current signal · last broadcast 2d ago
Flights observed
174
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S AD4A1D.

Country allocation

The ICAO 24-bit address AD4A1D 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
N95539 - 174 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-02 N95539 - Jul 2, 23:05 UTCJul 2, 23:50 UTC45m
2026-07-02 N95539 - Jul 2, 03:35 UTCJul 2, 04:20 UTC45m
2026-07-02 N95539 - Jul 2, 01:40 UTCJul 2, 02:50 UTC1h 10m
2026-07-02 N95539 - Jul 2, 00:25 UTCJul 2, 00:55 UTC30m
2026-07-01 N95539 - Jul 1, 20:45 UTCJul 1, 22:20 UTC1h 35m
2026-07-01 N95539 HIO → HIO Jul 1, 16:30 UTCJul 1, 19:20 UTC2h 50m
2026-07-01 N95539 - Jul 1, 00:15 UTCJul 1, 01:55 UTC1h 40m
2026-06-30 N95539 - Jun 30, 21:55 UTCJun 30, 23:25 UTC1h 30m
2026-06-30 N95539 HIO → HIO Jun 30, 19:45 UTCJun 30, 21:10 UTC1h 25m
2026-06-30 N95539 - Jun 30, 16:45 UTCJun 30, 18:10 UTC1h 25m
2026-06-30 N95539 - Jun 30, 00:14 UTCJun 30, 01:55 UTC1h 41m
2026-06-29 N95539 - Jun 29, 20:40 UTCJun 29, 22:15 UTC1h 35m
2026-06-29 N95539 - Jun 29, 19:39 UTCJun 29, 20:09 UTC30m
2026-06-29 N95539 - Jun 29, 18:25 UTCJun 29, 18:55 UTC30m
2026-06-29 N95539 - Jun 29, 00:00 UTCJun 29, 00:44 UTC45m
2026-06-28 N95539 HIO → TDO Jun 28, 21:20 UTCJun 28, 22:45 UTC1h 25m
2026-06-26 N95539 HIO → HIO Jun 26, 01:29 UTCJun 26, 02:09 UTC40m
2026-06-25 N95539 - Jun 25, 22:04 UTCJun 25, 23:34 UTC1h 30m
2026-06-25 N95539 - Jun 25, 19:54 UTCJun 25, 21:05 UTC1h 10m
2026-06-25 N95539 - Jun 25, 17:25 UTCJun 25, 19:09 UTC1h 45m
2026-06-25 N95539 HIO → HIO Jun 25, 15:15 UTCJun 25, 16:39 UTC1h 25m
2026-06-24 N95539 - Jun 24, 21:04 UTCJun 24, 22:35 UTC1h 30m
2026-06-24 N95539 - Jun 24, 17:45 UTCJun 24, 19:55 UTC2h 10m
2026-06-24 N95539 HIO → HIO Jun 24, 15:00 UTCJun 24, 16:29 UTC1h 30m
2026-06-24 N95539 HIO → HIO Jun 24, 00:49 UTCJun 24, 02:15 UTC1h 25m
2026-06-23 N95539 - Jun 23, 20:34 UTCJun 23, 21:59 UTC1h 25m
2026-06-23 N95539 - Jun 23, 16:29 UTCJun 23, 17:34 UTC1h 5m
2026-06-23 N95539 - Jun 23, 14:15 UTCJun 23, 15:34 UTC1h 20m
2026-06-23 N95539 CVO → HIO Jun 23, 00:19 UTCJun 23, 02:09 UTC1h 50m
2026-06-22 N95539 - Jun 22, 22:15 UTCJun 22, 23:05 UTC50m
2026-06-22 N95539 - Jun 22, 18:54 UTCJun 22, 19:24 UTC30m
2026-06-22 N95539 - Jun 22, 15:35 UTCJun 22, 16:54 UTC1h 20m
2026-06-21 N95539 - Jun 21, 23:30 UTCJun 22, 01:49 UTC2h 20m
2026-06-21 N95539 - Jun 21, 19:50 UTCJun 21, 21:49 UTC2h 0m
2026-06-20 N95539 - Jun 20, 23:19 UTCJun 21, 01:14 UTC1h 55m
2026-06-19 N95539 HIO → HIO Jun 19, 22:04 UTCJun 19, 23:19 UTC1h 15m
2026-06-19 N95539 - Jun 19, 18:39 UTCJun 19, 19:34 UTC55m
2026-06-19 N95539 - Jun 19, 15:24 UTCJun 19, 17:09 UTC1h 45m
2026-06-18 N95539 - Jun 18, 21:35 UTCJun 18, 23:10 UTC1h 35m
2026-06-18 N95539 - Jun 18, 19:50 UTCJun 18, 20:50 UTC1h 0m
2026-06-18 N95539 - Jun 18, 17:00 UTCJun 18, 18:55 UTC1h 55m
2026-06-18 N95539 - Jun 18, 00:25 UTCJun 18, 01:55 UTC1h 30m
2026-06-17 N95539 - Jun 17, 22:10 UTCJun 17, 22:55 UTC45m
2026-06-17 N95539 - Jun 17, 19:30 UTCJun 17, 21:10 UTC1h 40m
2026-06-17 N95539 - Jun 17, 17:55 UTCJun 17, 18:35 UTC40m
2026-06-17 N95539 - Jun 17, 15:20 UTCJun 17, 16:40 UTC1h 20m
2026-06-16 N95539 HIO → HIO Jun 16, 21:55 UTCJun 16, 22:20 UTC25m
2026-06-16 N95539 - Jun 16, 18:39 UTCJun 16, 19:45 UTC1h 5m
2026-06-16 N95539 - Jun 16, 15:55 UTCJun 16, 17:40 UTC1h 45m
2026-06-16 N95539 - Jun 16, 00:40 UTCJun 16, 01:04 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 N95539 page for operator, model, and routing details .

Mode-S AD4A1D frequently asked

What is Mode-S code AD4A1D?
AD4A1D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N95539.
Where is Mode-S AD4A1D registered?
Mode-S code AD4A1D 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 AD4A1D broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4A1D, octal 53245035, decimal 11,356,701.
What flights does AD4A1D operate?
Mode-S AD4A1D has broadcast 1 distinct callsign, including N95539.