Apparatus

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sensors Mode-S transponder

A7D666

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N604D · GULFSTREAM G280 · operated by DOMINION ENERGY SERVICES INC

Hex
A7D666
Octal
51753146
Decimal
10,999,398
Country
US
Tail
N604D
Type
G280
No current signal · last broadcast Jul 25, 21:05 UTC
Flights observed
132
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 21:05 UTC

Last known position

Most recent position reported by Mode-S A7D666.

Country allocation

The ICAO 24-bit address A7D666 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
N604D - 132 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N604D - Jul 25, 19:55 UTCJul 25, 21:05 UTC1h 10m
2026-07-25 N604D - Jul 25, 18:15 UTCJul 25, 19:35 UTC1h 20m
2026-07-24 N604D - Jul 24, 19:30 UTCJul 24, 21:15 UTC1h 45m
2026-07-24 N604D - Jul 24, 16:05 UTCJul 24, 17:45 UTC1h 40m
2026-07-24 N604D - Jul 24, 14:40 UTCJul 24, 15:30 UTC50m
2026-07-24 N604D - Jul 24, 11:50 UTCJul 24, 12:35 UTC45m
2026-07-23 N604D - Jul 23, 22:00 UTCJul 24, 01:35 UTC3h 35m
2026-07-22 N604D - Jul 22, 19:55 UTCJul 22, 20:50 UTC55m
2026-07-22 N604D - Jul 22, 16:20 UTCJul 22, 17:20 UTC1h 0m
2026-07-22 N604D - Jul 22, 01:55 UTCJul 22, 03:30 UTC1h 35m
2026-07-21 N604D - Jul 21, 19:30 UTCJul 21, 20:55 UTC1h 25m
2026-07-21 N604D SAV → RIC Jul 21, 17:25 UTCJul 21, 18:25 UTC1h 0m
2026-07-21 N604D - Jul 21, 14:10 UTCJul 21, 15:15 UTC1h 5m
2026-07-20 N604D - Jul 20, 20:00 UTCJul 20, 20:40 UTC40m
2026-07-20 N604D SAV → ABE Jul 20, 17:40 UTCJul 20, 19:15 UTC1h 35m
2026-07-20 N604D - Jul 20, 15:35 UTCJul 20, 16:35 UTC1h 0m
2026-07-19 N604D - Jul 19, 23:30 UTCJul 20, 00:20 UTC50m
2026-07-19 N604D - Jul 19, 22:25 UTCJul 19, 23:05 UTC40m
2026-07-17 N604D - Jul 17, 19:00 UTCJul 17, 19:25 UTC25m
2026-07-17 N604D - Jul 17, 15:40 UTCJul 17, 16:04 UTC25m
2026-07-16 N604D YYC → RIC Jul 16, 14:15 UTCJul 16, 17:54 UTC3h 40m
2026-07-10 N604D - Jul 10, 18:15 UTCJul 10, 22:40 UTC4h 25m
2026-07-09 N604D - Jul 9, 19:45 UTCJul 9, 20:35 UTC50m
2026-07-09 N604D - Jul 9, 11:35 UTCJul 9, 12:20 UTC45m
2026-07-08 N604D - Jul 8, 19:35 UTCJul 8, 20:25 UTC50m
2026-07-08 N604D - Jul 8, 11:40 UTCJul 8, 12:30 UTC50m
2026-07-07 N604D - Jul 7, 20:05 UTCJul 7, 20:50 UTC45m
2026-07-07 N604D - Jul 7, 11:35 UTCJul 7, 12:20 UTC45m
2026-07-06 N604D - Jul 6, 18:45 UTCJul 6, 23:10 UTC4h 25m
2026-07-03 N604D - Jul 3, 13:10 UTCJul 3, 17:55 UTC4h 45m
2026-07-02 N604D - Jul 2, 19:10 UTCJul 2, 20:15 UTC1h 5m
2026-07-02 N604D - Jul 2, 15:50 UTCJul 2, 16:35 UTC45m
2026-07-02 N604D - Jul 2, 12:50 UTCJul 2, 13:25 UTC35m
2026-06-26 N604D - Jun 26, 18:24 UTCJun 26, 22:29 UTC4h 5m
2026-06-26 N604D - Jun 26, 15:34 UTCJun 26, 17:40 UTC2h 5m
2026-06-26 N604D - Jun 26, 11:34 UTCJun 26, 11:45 UTC10m
2026-06-26 N604D - Jun 26, 10:50 UTCJun 26, 11:14 UTC25m
2026-06-24 N604D - Jun 24, 19:55 UTCJun 24, 20:14 UTC20m
2026-06-24 N604D - Jun 24, 17:45 UTCJun 24, 18:15 UTC30m
2026-06-24 N604D - Jun 24, 13:50 UTCJun 24, 15:09 UTC1h 20m
2026-06-24 N604D - Jun 24, 12:09 UTCJun 24, 13:20 UTC1h 10m
2026-06-23 N604D - Jun 23, 16:50 UTCJun 23, 19:19 UTC2h 30m
2026-06-19 N604D - Jun 19, 18:30 UTCJun 19, 20:04 UTC1h 35m
2026-06-18 N604D - Jun 18, 22:45 UTCJun 19, 00:29 UTC1h 44m
2026-06-18 N604D - Jun 18, 19:55 UTCJun 18, 20:45 UTC50m
2026-06-17 N604D - Jun 17, 20:15 UTCJun 17, 21:50 UTC1h 35m
2026-06-17 N604D - Jun 17, 12:05 UTCJun 17, 12:50 UTC45m
2026-06-17 N604D - Jun 17, 10:35 UTCJun 17, 11:25 UTC50m
2026-06-16 N604D - Jun 16, 15:15 UTCJun 16, 17:35 UTC2h 20m
2026-06-16 N604D - Jun 16, 12:35 UTCJun 16, 14:09 UTC1h 35m

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 N604D page for operator, model, and routing details .

Mode-S A7D666 frequently asked

What is Mode-S code A7D666?
A7D666 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N604D.
Where is Mode-S A7D666 registered?
Mode-S code A7D666 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 A7D666 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7D666, octal 51753146, decimal 10,999,398.
What flights does A7D666 operate?
Mode-S A7D666 has broadcast 1 distinct callsign, including N604D.