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 4h ago
Flights observed
251
Distinct callsigns
2
Country
US
Last broadcast
4h 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 242 2026-07-20
N512QS - 9 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 EJA512 ALB → CMH Jul 20, 16:05 UTCJul 20, 20:00 UTC3h 55m
2026-07-20 EJA512 ALB → CMH Jul 20, 13:40 UTCJul 20, 14:00 UTC20m
2026-07-20 EJA512 ALB → CMH Jul 20, 12:15 UTCJul 20, 13:00 UTC45m
2026-07-20 EJA512 ALB → CMH Jul 20, 00:40 UTCJul 20, 01:05 UTC25m
2026-07-19 EJA512 ALB → CMH Jul 19, 23:20 UTCJul 20, 00:00 UTC40m
2026-07-19 EJA512 ALB → CMH Jul 19, 20:25 UTCJul 19, 21:10 UTC45m
2026-07-19 EJA512 ALB → CMH Jul 19, 18:50 UTCJul 19, 19:30 UTC40m
2026-07-19 EJA512 ALB → CMH Jul 19, 15:45 UTCJul 19, 17:05 UTC1h 20m
2026-07-18 EJA512 ALB → CMH Jul 18, 23:55 UTCJul 19, 01:40 UTC1h 45m
2026-07-18 EJA512 ALB → CMH Jul 18, 21:40 UTCJul 18, 22:35 UTC55m
2026-07-18 EJA512 ALB → CMH Jul 18, 17:00 UTCJul 18, 20:20 UTC3h 20m
2026-07-17 EJA512 ALB → CMH Jul 17, 21:10 UTCJul 18, 15:45 UTC18h 36m
2026-07-17 EJA512 ALB → CMH Jul 17, 16:59 UTCJul 17, 19:09 UTC2h 10m
2026-07-17 EJA512 - Jul 17, 14:30 UTCJul 17, 15:15 UTC45m
2026-07-17 EJA512 - Jul 17, 12:55 UTCJul 17, 13:35 UTC40m
2026-07-16 EJA512 - Jul 16, 23:59 UTCJul 17, 00:20 UTC20m
2026-07-16 EJA512 - Jul 16, 19:25 UTCJul 16, 22:55 UTC3h 30m
2026-07-16 EJA512 - Jul 16, 15:25 UTCJul 16, 16:19 UTC55m
2026-07-16 EJA512 - Jul 16, 09:15 UTCJul 16, 12:14 UTC3h 0m
2026-07-15 EJA512 - Jul 15, 19:30 UTCJul 15, 20:25 UTC55m
2026-07-15 EJA512 - Jul 15, 15:50 UTCJul 15, 18:20 UTC2h 30m
2026-07-15 EJA512 - Jul 15, 11:10 UTCJul 15, 13:30 UTC2h 20m
2026-07-15 EJA512 - Jul 15, 02:40 UTCJul 15, 03:30 UTC50m
2026-07-15 EJA512 - Jul 15, 00:40 UTCJul 15, 01:45 UTC1h 5m
2026-07-14 EJA512 BUF → BWI Jul 14, 19:20 UTCJul 14, 20:05 UTC45m
2026-07-14 EJA512 - Jul 14, 17:00 UTCJul 14, 17:55 UTC55m
2026-07-14 EJA512 BUF → YHU Jul 14, 15:05 UTCJul 14, 16:05 UTC1h 0m
2026-07-14 EJA512 - Jul 14, 13:05 UTCJul 14, 13:50 UTC45m
2026-07-14 EJA512 - Jul 14, 11:45 UTCJul 14, 12:10 UTC25m
2026-07-12 EJA512 - Jul 12, 23:50 UTCJul 13, 00:45 UTC55m
2026-07-12 EJA512 - Jul 12, 17:30 UTCJul 12, 21:30 UTC4h 0m
2026-07-12 EJA512 - Jul 12, 13:50 UTCJul 12, 15:10 UTC1h 20m
2026-07-12 EJA512 - Jul 12, 12:05 UTCJul 12, 12:45 UTC40m
2026-07-11 EJA512 - Jul 11, 18:55 UTCJul 11, 19:35 UTC40m
2026-07-11 EJA512 - Jul 11, 14:50 UTCJul 11, 16:00 UTC1h 10m
2026-07-11 EJA512 - Jul 11, 12:55 UTCJul 11, 13:40 UTC45m
2026-07-10 EJA512 - Jul 10, 20:25 UTCJul 10, 22:05 UTC1h 40m
2026-07-10 EJA512 - Jul 10, 13:30 UTCJul 10, 16:20 UTC2h 50m
2026-07-09 EJA512 - Jul 9, 17:55 UTCJul 9, 19:35 UTC1h 40m
2026-07-09 EJA512 - Jul 9, 16:10 UTCJul 9, 16:35 UTC25m
2026-07-09 EJA512 - Jul 9, 14:30 UTCJul 9, 15:35 UTC1h 5m
2026-07-08 EJA512 - Jul 8, 19:35 UTCJul 8, 22:40 UTC3h 5m
2026-07-08 EJA512 - Jul 8, 17:55 UTCJul 8, 18:15 UTC20m
2026-07-08 EJA512 - Jul 8, 14:40 UTCJul 8, 17:05 UTC2h 25m
2026-07-08 EJA512 - Jul 8, 12:45 UTCJul 8, 13:25 UTC40m
2026-07-08 EJA512 ATL → IAD Jul 8, 01:10 UTCJul 8, 02:30 UTC1h 20m
2026-07-07 EJA512 - Jul 7, 22:30 UTCJul 7, 23:05 UTC35m
2026-07-07 EJA512 - Jul 7, 16:40 UTCJul 7, 21:15 UTC4h 35m
2026-07-07 EJA512 - Jul 7, 07:00 UTCJul 7, 08:25 UTC1h 25m
2026-07-07 EJA512 BFI → CCR Jul 7, 04:25 UTCJul 7, 06:05 UTC1h 40m

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 4h 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.