Apparatus

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sensors Mode-S transponder

A4D35C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N41SE · DIAMOND DA-20 · operated by DIAMOND AIRCRAFT SALES OF KENTUCKY LLC

Hex
A4D35C
Octal
51151534
Decimal
10,802,012
Country
US
Tail
N41SE
Type
DV20
No current signal · last broadcast 1d ago
Flights observed
142
Distinct callsigns
5
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A4D35C.

Country allocation

The ICAO 24-bit address A4D35C 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 5 distinct

Callsign Airline Flights Last seen
ISU12 - 103 2026-07-16
N41SE - 13 2026-07-15
ISU10 - 3 2026-05-06
41SE - 2 2026-05-20
1200 - 1 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 ISU12 - Jul 16, 16:30 UTCJul 16, 18:19 UTC1h 50m
2026-07-16 ISU12 - Jul 16, 13:25 UTCJul 16, 13:34 UTC10m
2026-07-16 ISU12 - Jul 16, 12:05 UTCJul 16, 12:25 UTC20m
2026-07-16 ISU12 - Jul 16, 11:10 UTCJul 16, 11:20 UTC10m
2026-07-16 1200 - Jul 16, 02:00 UTCJul 16, 02:45 UTC45m
2026-07-15 ISU12 - Jul 15, 22:50 UTCJul 15, 23:00 UTC10m
2026-07-15 N41SE HUF → HUF Jul 15, 21:45 UTCJul 15, 22:10 UTC25m
2026-07-15 N41SE - Jul 15, 21:00 UTCJul 15, 21:10 UTC10m
2026-07-15 N41SE - Jul 15, 18:50 UTCJul 15, 19:25 UTC35m
2026-07-14 - - Jul 14, 22:35 UTCJul 14, 22:50 UTC14m
2026-07-14 ISU12 - Jul 14, 20:50 UTCJul 14, 21:30 UTC40m
2026-07-14 ISU12 - Jul 14, 18:55 UTCJul 14, 20:15 UTC1h 20m
2026-07-14 ISU12 - Jul 14, 17:35 UTCJul 14, 18:15 UTC40m
2026-07-14 ISU12 - Jul 14, 15:20 UTCJul 14, 15:30 UTC10m
2026-07-14 ISU12 - Jul 14, 13:40 UTCJul 14, 14:45 UTC1h 5m
2026-07-14 ISU12 - Jul 14, 12:00 UTCJul 14, 12:35 UTC35m
2026-07-13 ISU12 - Jul 13, 22:20 UTCJul 13, 22:35 UTC15m
2026-07-13 ISU12 - Jul 13, 21:10 UTCJul 13, 21:25 UTC15m
2026-07-13 - - Jul 13, 20:00 UTCJul 13, 20:15 UTC15m
2026-07-13 ISU12 - Jul 13, 15:35 UTCJul 13, 16:15 UTC40m
2026-07-13 ISU12 - Jul 13, 14:15 UTCJul 13, 14:30 UTC15m
2026-06-25 N41SE - Jun 25, 03:50 UTCJun 25, 03:59 UTC10m
2026-06-25 N41SE - Jun 25, 02:30 UTCJun 25, 03:04 UTC35m
2026-06-24 ISU12 HUF → HUF Jun 24, 21:50 UTCJun 24, 22:29 UTC40m
2026-06-24 ISU12 - Jun 24, 20:40 UTCJun 24, 20:54 UTC15m
2026-06-17 ISU12 - Jun 17, 14:25 UTCJun 17, 14:50 UTC25m
2026-06-17 ISU12 - Jun 17, 13:30 UTCJun 17, 13:45 UTC15m
2026-06-17 - - Jun 17, 11:35 UTCJun 17, 12:45 UTC1h 10m
2026-06-16 ISU12 - Jun 16, 14:20 UTCJun 16, 14:39 UTC20m
2026-06-16 ISU12 - Jun 16, 13:25 UTCJun 16, 13:34 UTC10m
2026-06-15 ISU12 - Jun 15, 22:59 UTCJun 15, 23:39 UTC40m
2026-06-15 ISU12 - Jun 15, 13:20 UTCJun 15, 14:45 UTC1h 25m
2026-06-13 ISU12 - Jun 13, 13:20 UTCJun 13, 15:10 UTC1h 50m
2026-06-12 ISU12 - Jun 12, 11:45 UTCJun 12, 13:05 UTC1h 20m
2026-06-11 ISU12 - Jun 11, 16:50 UTCJun 11, 17:35 UTC45m
2026-06-11 ISU12 - Jun 11, 02:05 UTCJun 11, 02:50 UTC45m
2026-06-10 ISU12 - Jun 10, 20:45 UTCJun 10, 21:20 UTC35m
2026-06-10 - - Jun 10, 17:10 UTCJun 10, 17:20 UTC10m
2026-06-10 ISU12 - Jun 10, 16:10 UTCJun 10, 16:20 UTC10m
2026-06-10 ISU12 - Jun 10, 13:50 UTCJun 10, 14:35 UTC45m
2026-06-09 - - Jun 9, 17:10 UTCJun 9, 18:10 UTC1h 0m
2026-06-08 ISU12 HUF → HUF Jun 8, 11:35 UTCJun 8, 12:05 UTC30m
2026-06-05 ISU12 - Jun 5, 21:30 UTCJun 5, 22:50 UTC1h 20m
2026-06-05 ISU12 - Jun 5, 13:55 UTCJun 5, 15:20 UTC1h 25m
2026-06-05 ISU12 HUF → HUF Jun 5, 02:30 UTCJun 5, 03:25 UTC55m
2026-06-04 ISU12 - Jun 4, 20:50 UTCJun 4, 21:05 UTC15m
2026-06-04 ISU12 - Jun 4, 20:05 UTCJun 4, 20:20 UTC15m
2026-06-04 ISU12 - Jun 4, 16:55 UTCJun 4, 17:05 UTC10m
2026-06-04 ISU12 HUF → HUF Jun 4, 16:00 UTCJun 4, 16:15 UTC15m
2026-06-04 ISU12 - Jun 4, 15:10 UTCJun 4, 15:25 UTC15m

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 N41SE page for operator, model, and routing details .

Mode-S A4D35C frequently asked

What is Mode-S code A4D35C?
A4D35C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N41SE.
Where is Mode-S A4D35C registered?
Mode-S code A4D35C 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 A4D35C broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4D35C, octal 51151534, decimal 10,802,012.
What flights does A4D35C operate?
Mode-S A4D35C has broadcast 5 distinct callsigns, including ISU12, N41SE, ISU10, 41SE, 1200.