Apparatus

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sensors Mode-S transponder

A4E29D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4137L · PIPER PA-28-140/150/160/180 · operated by LUV 2 FLY ADA LLC

Hex
A4E29D
Octal
51161235
Decimal
10,805,917
Country
US
Tail
N4137L
Type
P28A
No current signal · last broadcast 18d ago
Flights observed
22
Distinct callsigns
1
Country
US
Last broadcast
18d ago

Last known position

Most recent position reported by Mode-S A4E29D.

Country allocation

The ICAO 24-bit address A4E29D 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
N4137L - 22 2026-07-26

Recent flights last 22

DateFlightRouteTakeoffLandingDuration
2026-07-26 N4137L - Jul 26, 03:05 UTCJul 26, 04:00 UTC55m
2026-07-26 N4137L - Jul 26, 02:35 UTCJul 26, 03:00 UTC25m
2026-07-25 N4137L - Jul 25, 14:35 UTCJul 25, 14:55 UTC20m
2026-07-25 N4137L - Jul 25, 00:45 UTCJul 25, 01:15 UTC30m
2026-07-14 N4137L - Jul 14, 17:20 UTCJul 14, 17:35 UTC15m
2026-06-18 N4137L - Jun 18, 20:15 UTCJun 18, 20:40 UTC25m
2026-06-18 N4137L - Jun 18, 01:05 UTCJun 18, 01:35 UTC30m
2026-06-17 N4137L - Jun 17, 20:00 UTCJun 17, 20:45 UTC45m
2026-06-16 N4137L - Jun 16, 22:25 UTCJun 16, 22:55 UTC30m
2026-06-16 N4137L - Jun 16, 01:15 UTCJun 16, 01:40 UTC25m
2026-06-15 N4137L - Jun 15, 21:04 UTCJun 15, 21:40 UTC35m
2026-06-13 N4137L - Jun 13, 21:20 UTCJun 13, 21:45 UTC25m
2026-06-13 N4137L - Jun 13, 14:25 UTCJun 13, 15:10 UTC45m
2026-06-13 N4137L - Jun 13, 02:55 UTCJun 13, 04:15 UTC1h 19m
2026-06-12 N4137L - Jun 12, 22:10 UTCJun 12, 22:45 UTC35m
2026-06-11 N4137L - Jun 11, 20:00 UTCJun 11, 20:50 UTC50m
2026-06-11 N4137L - Jun 11, 15:05 UTCJun 11, 15:15 UTC10m
2026-06-10 N4137L - Jun 10, 19:45 UTCJun 10, 20:30 UTC45m
2026-06-10 N4137L - Jun 10, 01:55 UTCJun 10, 03:20 UTC1h 25m
2026-06-10 N4137L - Jun 10, 00:45 UTCJun 10, 01:00 UTC15m
2026-06-08 N4137L - Jun 8, 21:45 UTCJun 8, 22:25 UTC40m
2026-05-12 N4137L - May 12, 21:20 UTCMay 12, 21:55 UTC35m

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 N4137L page for operator, model, and routing details .

Mode-S A4E29D frequently asked

What is Mode-S code A4E29D?
A4E29D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4137L.
Where is Mode-S A4E29D registered?
Mode-S code A4E29D 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 A4E29D broadcasting right now?
No active broadcast right now. Last signal was 18d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4E29D, octal 51161235, decimal 10,805,917.
What flights does A4E29D operate?
Mode-S A4E29D has broadcast 1 distinct callsign, including N4137L.