Apparatus

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sensors Mode-S transponder

A66A4C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N512QS · CESSNA 680 Citation Latitude · operated by NETJETS SALES INC, CF INDUSTRIES ENTERPRISES LLC, J HACKETT LLC, J&J ROWE LLC, JOHNS MANVILLE, SSS HOLDINGS LLC

Hex
A66A4C
Octal
51465114
Decimal
10,906,188
Country
US
Tail
N512QS
Type
C68A
No current signal · last broadcast 12h ago
Flights observed
120
Distinct callsigns
2
Country
US
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S A66A4C.

Country allocation

The ICAO 24-bit address A66A4C 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 2 distinct

Callsign Airline Flights Last seen
EJA512 NetJets 119 2026-06-04
N512QS - 1 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-04 EJA512 ALB → CMH Jun 4, 19:35 UTCJun 4, 19:55 UTC20m
2026-06-04 EJA512 ALB → CMH Jun 4, 16:40 UTCJun 4, 18:40 UTC2h 0m
2026-05-30 EJA512 ALB → CMH May 30, 15:35 UTCMay 30, 17:55 UTC2h 20m
2026-05-29 EJA512 ALB → CMH May 29, 19:00 UTCMay 29, 20:35 UTC1h 35m
2026-05-29 EJA512 ALB → CMH May 29, 17:05 UTCMay 29, 17:25 UTC20m
2026-05-29 EJA512 ALB → CMH May 29, 14:35 UTCMay 29, 15:35 UTC1h 0m
2026-05-29 EJA512 ALB → CMH May 29, 12:25 UTCMay 29, 13:35 UTC1h 10m
2026-05-28 EJA512 ALB → CMH May 28, 19:20 UTCMay 28, 20:15 UTC55m
2026-05-28 EJA512 ALB → CMH May 28, 16:15 UTCMay 28, 18:45 UTC2h 30m
2026-05-27 EJA512 ALB → CMH May 27, 22:05 UTCMay 27, 23:30 UTC1h 25m
2026-05-27 EJA512 ALB → CMH May 27, 20:55 UTCMay 27, 21:25 UTC30m
2026-05-27 EJA512 ALB → CMH May 27, 15:50 UTCMay 27, 19:25 UTC3h 35m
2026-05-27 EJA512 ALB → CMH May 27, 13:00 UTCMay 27, 14:30 UTC1h 30m
2026-05-25 EJA512 ALB → CMH May 25, 20:30 UTCMay 25, 21:30 UTC1h 0m
2026-05-25 EJA512 ALB → CMH May 25, 16:55 UTCMay 25, 17:15 UTC20m
2026-05-24 EJA512 ALB → CMH May 24, 23:00 UTCMay 24, 23:30 UTC30m
2026-05-24 EJA512 ALB → CMH May 24, 21:15 UTCMay 24, 21:45 UTC30m
2026-05-24 EJA512 ALB → CMH May 24, 18:50 UTCMay 24, 19:35 UTC45m
2026-05-23 EJA512 ALB → CMH May 23, 23:05 UTCMay 23, 23:45 UTC40m
2026-05-23 EJA512 ALB → CMH May 23, 14:30 UTCMay 23, 15:05 UTC35m
2026-05-22 EJA512 ALB → CMH May 22, 18:40 UTCMay 22, 19:50 UTC1h 10m
2026-05-22 EJA512 ALB → CMH May 22, 16:30 UTCMay 22, 17:55 UTC1h 25m
2026-05-22 EJA512 ALB → CMH May 22, 01:10 UTCMay 22, 03:15 UTC2h 5m
2026-05-21 EJA512 ALB → CMH May 21, 20:20 UTCMay 21, 21:25 UTC1h 5m
2026-05-21 EJA512 ALB → CMH May 21, 18:10 UTCMay 21, 19:10 UTC1h 0m
2026-05-21 EJA512 ALB → CMH May 21, 15:10 UTCMay 21, 16:10 UTC1h 0m
2026-05-20 EJA512 ALB → CMH May 20, 22:30 UTCMay 20, 23:00 UTC30m
2026-05-20 EJA512 ALB → CMH May 20, 21:05 UTCMay 20, 21:15 UTC10m
2026-05-20 EJA512 ALB → CMH May 20, 19:35 UTCMay 20, 20:25 UTC50m
2026-05-20 EJA512 ALB → CMH May 20, 14:25 UTCMay 20, 16:25 UTC2h 0m
2026-05-19 EJA512 ALB → CMH May 19, 23:45 UTCMay 20, 00:45 UTC1h 0m
2026-05-19 EJA512 ALB → CMH May 19, 14:30 UTCMay 19, 23:00 UTC8h 30m
2026-05-18 EJA512 ALB → CMH May 18, 21:35 UTCMay 18, 22:30 UTC55m
2026-05-18 EJA512 ALB → CMH May 18, 20:05 UTCMay 18, 20:45 UTC40m
2026-05-18 EJA512 ALB → CMH May 18, 15:40 UTCMay 18, 19:10 UTC3h 29m
2026-05-17 EJA512 ALB → CMH May 17, 21:05 UTCMay 18, 19:10 UTC22h 4m
2026-05-17 EJA512 ALB → CMH May 17, 20:01 UTCMay 18, 19:00 UTC22h 59m
2026-05-17 EJA512 ALB → CMH May 17, 18:45 UTCMay 17, 19:20 UTC35m
2026-05-17 EJA512 ALB → CMH May 17, 16:45 UTCMay 17, 17:25 UTC40m
2026-05-16 EJA512 ALB → CMH May 16, 23:30 UTCMay 17, 04:30 UTC5h 0m
2026-05-15 EJA512 ALB → CMH May 15, 18:20 UTCMay 15, 20:15 UTC1h 55m
2026-05-15 EJA512 ALB → CMH May 15, 16:20 UTCMay 15, 16:55 UTC35m
2026-05-14 EJA512 ALB → CMH May 14, 21:45 UTCMay 14, 22:10 UTC25m
2026-05-14 EJA512 ALB → CMH May 14, 19:00 UTCMay 14, 20:50 UTC1h 50m
2026-05-14 EJA512 ALB → CMH May 14, 16:30 UTCMay 14, 16:50 UTC20m
2026-05-14 EJA512 ALB → CMH May 14, 15:10 UTCMay 14, 16:00 UTC50m
2026-05-14 EJA512 ALB → CMH May 14, 13:20 UTCMay 14, 14:05 UTC45m
2026-05-13 EJA512 ALB → CMH May 13, 20:25 UTCMay 13, 22:45 UTC2h 20m
2026-05-13 EJA512 ALB → CMH May 13, 18:30 UTCMay 13, 19:20 UTC50m
2026-05-13 EJA512 ALB → CMH May 13, 16:40 UTCMay 13, 17:20 UTC40m

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 N512QS page for operator, model, and routing details .

Mode-S A66A4C frequently asked

What is Mode-S code A66A4C?
A66A4C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N512QS.
Where is Mode-S A66A4C registered?
Mode-S code A66A4C 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 A66A4C broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A66A4C, octal 51465114, decimal 10,906,188.
What flights does A66A4C operate?
Mode-S A66A4C has broadcast 2 distinct callsigns, including EJA512, N512QS.