Apparatus

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sensors Mode-S transponder

A4C558

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4060W · ROBINSON R-66 · operated by ROBINSON HELICOPTER CO

Hex
A4C558
Octal
51142530
Decimal
10,798,424
Country
US
Tail
N4060W
Type
R66
No current signal · last broadcast 7d ago
Flights observed
45
Distinct callsigns
1
Country
US
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S A4C558.

Country allocation

The ICAO 24-bit address A4C558 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
N4060W - 45 2026-07-26

Recent flights last 45

DateFlightRouteTakeoffLandingDuration
2026-07-26 N4060W FUL → TOA Jul 26, 19:40 UTCJul 26, 20:15 UTC35m
2026-07-26 N4060W - Jul 26, 18:05 UTCJul 26, 18:20 UTC15m
2026-07-24 N4060W - Jul 24, 19:35 UTCJul 24, 19:45 UTC10m
2026-07-07 N4060W - Jul 7, 20:30 UTCJul 7, 20:55 UTC25m
2026-06-26 N4060W - Jun 26, 19:50 UTCJun 26, 20:10 UTC20m
2026-06-26 N4060W - Jun 26, 15:39 UTCJun 26, 16:00 UTC20m
2026-06-25 N4060W - Jun 25, 21:29 UTCJun 25, 22:14 UTC45m
2026-06-25 N4060W - Jun 25, 20:05 UTCJun 25, 20:19 UTC15m
2026-06-25 N4060W - Jun 25, 17:20 UTCJun 25, 18:10 UTC50m
2026-06-22 N4060W - Jun 22, 20:30 UTCJun 22, 21:10 UTC40m
2026-06-22 N4060W TOA → FUL Jun 22, 18:35 UTCJun 22, 19:24 UTC50m
2026-06-21 N4060W - Jun 21, 21:05 UTCJun 21, 21:34 UTC30m
2026-06-21 N4060W - Jun 21, 18:50 UTCJun 21, 19:09 UTC20m
2026-06-20 N4060W - Jun 20, 22:39 UTCJun 20, 23:14 UTC35m
2026-06-18 N4060W - Jun 18, 16:10 UTCJun 18, 16:45 UTC35m
2026-06-18 N4060W - Jun 18, 15:30 UTCJun 18, 16:05 UTC35m
2026-06-14 N4060W TOA → TOA Jun 14, 21:00 UTCJun 14, 22:00 UTC1h 0m
2026-06-12 N4060W TOA → TOA Jun 12, 22:40 UTCJun 12, 23:25 UTC45m
2026-06-12 N4060W TOA → TOA Jun 12, 20:40 UTCJun 12, 21:35 UTC55m
2026-06-12 N4060W - Jun 12, 19:05 UTCJun 12, 20:00 UTC55m
2026-06-11 N4060W - Jun 11, 23:45 UTCJun 12, 01:05 UTC1h 21m
2026-06-11 N4060W TOA → TOA Jun 11, 21:10 UTCJun 11, 22:20 UTC1h 10m
2026-06-11 N4060W - Jun 11, 19:20 UTCJun 11, 20:30 UTC1h 10m
2026-06-11 N4060W - Jun 11, 17:45 UTCJun 11, 18:35 UTC50m
2026-06-10 N4060W - Jun 10, 23:05 UTCJun 11, 00:05 UTC1h 0m
2026-06-10 N4060W TOA → TOA Jun 10, 19:10 UTCJun 10, 22:10 UTC3h 0m
2026-06-07 N4060W - Jun 7, 18:00 UTCJun 7, 18:45 UTC45m
2026-06-06 N4060W - Jun 6, 22:39 UTCJun 6, 22:50 UTC10m
2026-06-06 N4060W - Jun 6, 22:10 UTCJun 6, 22:34 UTC25m
2026-06-05 N4060W - Jun 5, 19:20 UTCJun 5, 22:00 UTC2h 40m
2026-06-04 N4060W SPQ → TOA Jun 4, 19:20 UTCJun 4, 21:50 UTC2h 30m
2026-06-03 N4060W SPQ → TOA Jun 3, 20:35 UTCJun 3, 21:30 UTC55m
2026-06-03 N4060W SPQ → TOA Jun 3, 18:50 UTCJun 3, 19:50 UTC1h 0m
2026-05-24 N4060W - May 24, 23:15 UTCMay 24, 23:40 UTC25m
2026-05-24 N4060W - May 24, 19:00 UTCMay 24, 20:15 UTC1h 15m
2026-05-23 N4060W TOA → TOA May 23, 22:20 UTCMay 23, 22:45 UTC25m
2026-05-06 N4060W - May 6, 19:05 UTCMay 6, 23:05 UTC4h 0m
2026-05-06 N4060W TOA → TOA May 6, 17:00 UTCMay 6, 18:10 UTC1h 9m
2026-04-28 N4060W TOA → TOA Apr 28, 18:45 UTCApr 28, 19:05 UTC20m
2026-04-26 N4060W - Apr 26, 22:15 UTCApr 26, 22:30 UTC15m
2026-04-26 N4060W - Apr 26, 21:45 UTCApr 26, 22:10 UTC25m
2026-04-25 N4060W - Apr 25, 21:45 UTCApr 25, 22:35 UTC50m
2026-04-23 N4060W TOA → TOA Apr 23, 16:50 UTCApr 23, 18:10 UTC1h 20m
2026-04-22 N4060W - Apr 22, 16:35 UTCApr 22, 17:00 UTC25m
2026-04-22 N4060W - Apr 22, 14:20 UTCApr 22, 14:50 UTC30m

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 N4060W page for operator, model, and routing details .

Mode-S A4C558 frequently asked

What is Mode-S code A4C558?
A4C558 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4060W.
Where is Mode-S A4C558 registered?
Mode-S code A4C558 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 A4C558 broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C558, octal 51142530, decimal 10,798,424.
What flights does A4C558 operate?
Mode-S A4C558 has broadcast 1 distinct callsign, including N4060W.