Apparatus

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sensors Mode-S transponder

A066F8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N125HD · AEROSPATIALE AS-350 Ecureuil · operated by US HELICOPTERS INC

Hex
A066F8
Octal
50063370
Decimal
10,512,120
Country
US
Tail
N125HD
Type
AS50
Broadcasting now · callsign N125HD · 1,900 ft
Flights observed
127
Distinct callsigns
1
Country
US
Last broadcast
7d ago

Current position

A066F8 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A066F8 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
N125HD - 127 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 N125HD - Jul 23, 14:30 UTCJul 23, 15:35 UTC1h 5m
2026-07-23 N125HD - Jul 23, 04:25 UTCJul 23, 05:25 UTC1h 0m
2026-07-22 N125HD - Jul 22, 01:50 UTCJul 22, 02:35 UTC45m
2026-07-21 N125HD - Jul 21, 18:40 UTCJul 21, 19:05 UTC25m
2026-07-21 N125HD - Jul 21, 17:30 UTCJul 21, 17:55 UTC25m
2026-07-21 N125HD - Jul 21, 13:20 UTCJul 21, 14:50 UTC1h 30m
2026-07-20 N125HD - Jul 20, 16:30 UTCJul 20, 17:10 UTC40m
2026-07-17 N125HD - Jul 17, 16:40 UTCJul 17, 16:49 UTC10m
2026-07-17 N125HD - Jul 17, 15:00 UTCJul 17, 16:15 UTC1h 15m
2026-07-17 N125HD - Jul 17, 02:20 UTCJul 17, 03:10 UTC50m
2026-07-16 N125HD - Jul 16, 03:45 UTCJul 16, 04:30 UTC45m
2026-07-16 N125HD - Jul 16, 01:40 UTCJul 16, 03:00 UTC1h 20m
2026-07-15 N125HD - Jul 15, 04:00 UTCJul 15, 04:10 UTC10m
2026-07-14 N125HD - Jul 14, 23:25 UTCJul 15, 00:50 UTC1h 25m
2026-07-14 N125HD - Jul 14, 01:00 UTCJul 14, 01:40 UTC40m
2026-07-13 N125HD - Jul 13, 18:15 UTCJul 13, 18:50 UTC35m
2026-07-11 N125HD - Jul 11, 02:05 UTCJul 11, 03:05 UTC1h 0m
2026-07-10 N125HD - Jul 10, 17:40 UTCJul 10, 18:40 UTC1h 0m
2026-07-10 N125HD - Jul 10, 13:35 UTCJul 10, 14:20 UTC45m
2026-07-09 N125HD - Jul 9, 22:55 UTCJul 10, 00:20 UTC1h 25m
2026-07-09 N125HD - Jul 9, 13:15 UTCJul 9, 14:40 UTC1h 25m
2026-07-09 N125HD - Jul 9, 02:55 UTCJul 9, 03:35 UTC40m
2026-07-07 N125HD - Jul 7, 23:50 UTCJul 8, 00:30 UTC40m
2026-07-06 N125HD - Jul 6, 18:00 UTCJul 6, 18:20 UTC20m
2026-07-06 N125HD - Jul 6, 16:45 UTCJul 6, 17:10 UTC25m
2026-07-06 N125HD - Jul 6, 13:15 UTCJul 6, 14:20 UTC1h 5m
2026-07-05 N125HD - Jul 5, 00:30 UTCJul 5, 01:55 UTC1h 25m
2026-07-02 N125HD - Jul 2, 16:50 UTCJul 2, 17:05 UTC15m
2026-07-02 N125HD - Jul 2, 04:50 UTCJul 2, 05:25 UTC35m
2026-07-01 N125HD - Jul 1, 18:10 UTCJul 1, 19:00 UTC50m
2026-07-01 N125HD - Jul 1, 04:00 UTCJul 1, 05:00 UTC1h 0m
2026-06-30 N125HD - Jun 30, 23:05 UTCJun 30, 23:15 UTC10m
2026-06-30 N125HD - Jun 30, 21:35 UTCJun 30, 21:50 UTC15m
2026-06-29 N125HD - Jun 29, 22:19 UTCJun 30, 00:00 UTC1h 40m
2026-06-27 N125HD - Jun 27, 01:19 UTCJun 27, 02:39 UTC1h 20m
2026-06-27 N125HD - Jun 27, 00:20 UTCJun 27, 01:04 UTC45m
2026-06-26 N125HD - Jun 26, 17:35 UTCJun 26, 18:24 UTC50m
2026-06-26 N125HD - Jun 26, 14:09 UTCJun 26, 15:15 UTC1h 5m
2026-06-26 N125HD - Jun 26, 03:20 UTCJun 26, 04:00 UTC40m
2026-06-25 N125HD - Jun 25, 22:59 UTCJun 25, 23:39 UTC40m
2026-06-24 N125HD - Jun 24, 23:00 UTCJun 25, 00:09 UTC1h 10m
2026-06-24 N125HD - Jun 24, 21:19 UTCJun 24, 22:14 UTC55m
2026-06-24 N125HD - Jun 24, 19:29 UTCJun 24, 20:40 UTC1h 10m
2026-06-24 N125HD - Jun 24, 04:24 UTCJun 24, 04:59 UTC35m
2026-06-24 N125HD - Jun 24, 00:44 UTCJun 24, 01:44 UTC1h 0m
2026-06-23 N125HD - Jun 23, 16:44 UTCJun 23, 17:30 UTC45m
2026-06-23 N125HD - Jun 23, 01:35 UTCJun 23, 02:20 UTC45m
2026-06-22 N125HD - Jun 22, 17:44 UTCJun 22, 18:30 UTC45m
2026-06-22 N125HD - Jun 22, 12:49 UTCJun 22, 14:24 UTC1h 35m
2026-06-20 N125HD - Jun 20, 16:34 UTCJun 20, 16:59 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 N125HD page for operator, model, and routing details .

Mode-S A066F8 frequently asked

What is Mode-S code A066F8?
A066F8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N125HD.
Where is Mode-S A066F8 registered?
Mode-S code A066F8 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 A066F8 broadcasting right now?
Yes. Mode-S A066F8 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A066F8, octal 50063370, decimal 10,512,120.
What flights does A066F8 operate?
Mode-S A066F8 has broadcast 1 distinct callsign, including N125HD.