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sensors Mode-S transponder

A605A5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4875D · MOONEY M-20 · operated by WARREN PIERCE H

Hex
A605A5
Octal
51402645
Decimal
10,880,421
Country
US
Tail
N4875D
Type
M20P
No current signal · last broadcast Jul 22, 21:55 UTC
Flights observed
19
Distinct callsigns
1
Country
US
Last broadcast
Jul 22, 21:55 UTC

Last known position

Most recent position reported by Mode-S A605A5.

Country allocation

The ICAO 24-bit address A605A5 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
N4875D - 19 2026-07-22

Recent flights last 19

DateFlightRouteTakeoffLandingDuration
2026-07-22 N4875D - Jul 22, 20:00 UTCJul 22, 21:55 UTC1h 55m
2026-07-21 N4875D RHV → VNY Jul 21, 18:35 UTCJul 21, 20:35 UTC2h 0m
2026-07-16 N4875D - Jul 16, 20:19 UTCJul 16, 20:35 UTC15m
2026-07-16 N4875D - Jul 16, 19:25 UTCJul 16, 19:40 UTC15m
2026-07-15 N4875D - Jul 15, 20:50 UTCJul 15, 21:10 UTC20m
2026-07-15 N4875D - Jul 15, 19:55 UTCJul 15, 20:10 UTC15m
2026-06-17 N4875D RHV → RHV Jun 17, 21:10 UTCJun 17, 21:15 UTC5m
2026-06-10 N4875D - Jun 10, 21:45 UTCJun 10, 22:00 UTC15m
2026-06-10 N4875D - Jun 10, 20:05 UTCJun 10, 20:20 UTC15m
2026-06-10 N4875D RHV → RHV Jun 10, 19:50 UTCJun 10, 20:00 UTC10m
2026-06-06 N4875D RHV → RHV Jun 6, 20:35 UTCJun 6, 20:45 UTC10m
2026-06-06 N4875D RHV → RHV Jun 6, 20:25 UTCJun 6, 20:30 UTC5m
2026-06-03 N4875D - Jun 3, 19:45 UTCJun 3, 20:45 UTC1h 0m
2026-04-24 N4875D - Apr 24, 22:10 UTCApr 24, 22:20 UTC10m
2026-04-24 N4875D - Apr 24, 20:45 UTCApr 24, 21:05 UTC20m
2026-04-23 N4875D RHV → RHV Apr 23, 20:40 UTCApr 23, 20:55 UTC15m
2026-04-19 N4875D - Apr 19, 23:35 UTCApr 20, 00:10 UTC35m
2026-04-19 N4875D - Apr 19, 20:45 UTCApr 19, 21:25 UTC40m
2026-04-14 N4875D - Apr 14, 21:00 UTCApr 14, 21:10 UTC10m

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 N4875D page for operator, model, and routing details .

Mode-S A605A5 frequently asked

What is Mode-S code A605A5?
A605A5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4875D.
Where is Mode-S A605A5 registered?
Mode-S code A605A5 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 A605A5 broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A605A5, octal 51402645, decimal 10,880,421.
What flights does A605A5 operate?
Mode-S A605A5 has broadcast 1 distinct callsign, including N4875D.