Apparatus

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sensors Mode-S transponder

A7A28D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N591QS · CESSNA 680 Citation Latitude · operated by NETJETS SALES INC, BALON CORP, EAGLE WINGS LLC, FLO-SUN AIRCRAFT INC, HALPERN JOHN, LEO CAPITAL HOLDINGS LLC

Hex
A7A28D
Octal
51721215
Decimal
10,986,125
Country
US
Tail
N591QS
Type
C68A
No current signal · last broadcast 5d ago
Flights observed
234
Distinct callsigns
2
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S A7A28D.

Country allocation

The ICAO 24-bit address A7A28D 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
EJA591 - 222 2026-07-08
N591QS - 12 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-08 EJA591 BNA → GDC Jul 8, 20:35 UTCJul 8, 21:15 UTC40m
2026-07-08 EJA591 - Jul 8, 18:35 UTCJul 8, 19:45 UTC1h 10m
2026-07-08 EJA591 AUS → BTR Jul 8, 15:00 UTCJul 8, 16:00 UTC1h 0m
2026-07-08 EJA591 - Jul 8, 13:35 UTCJul 8, 14:10 UTC35m
2026-07-07 EJA591 - Jul 7, 22:05 UTCJul 7, 23:55 UTC1h 50m
2026-07-07 EJA591 - Jul 7, 20:25 UTCJul 7, 21:25 UTC1h 0m
2026-07-07 EJA591 LAS → SLC Jul 7, 16:10 UTCJul 7, 17:05 UTC55m
2026-07-06 EJA591 - Jul 6, 23:10 UTCJul 7, 00:20 UTC1h 10m
2026-07-06 EJA591 - Jul 6, 22:00 UTCJul 6, 22:30 UTC30m
2026-07-06 EJA591 - Jul 6, 13:20 UTCJul 6, 19:30 UTC6h 10m
2026-07-05 EJA591 - Jul 5, 21:00 UTCJul 5, 21:45 UTC45m
2026-07-05 N591QS - Jul 5, 18:35 UTCJul 5, 19:45 UTC1h 10m
2026-07-04 N591QS - Jul 4, 17:05 UTCJul 4, 19:15 UTC2h 10m
2026-07-03 EJA591 - Jul 3, 20:55 UTCJul 3, 21:05 UTC10m
2026-07-03 EJA591 ADS → APC Jul 3, 16:15 UTCJul 3, 19:55 UTC3h 40m
2026-07-03 EJA591 - Jul 3, 14:10 UTCJul 3, 15:05 UTC55m
2026-06-28 EJA591 - Jun 28, 18:49 UTCJun 28, 20:34 UTC1h 45m
2026-06-28 EJA591 - Jun 28, 16:35 UTCJun 28, 17:25 UTC50m
2026-06-27 EJA591 SAN → VNY Jun 27, 05:29 UTCJun 27, 05:59 UTC30m
2026-06-27 EJA591 - Jun 27, 04:09 UTCJun 27, 04:59 UTC50m
2026-06-27 EJA591 - Jun 27, 02:04 UTCJun 27, 02:50 UTC45m
2026-06-26 EJA591 - Jun 26, 21:04 UTCJun 26, 21:59 UTC55m
2026-06-26 EJA591 - Jun 26, 05:24 UTCJun 26, 06:25 UTC1h 0m
2026-06-26 EJA591 - Jun 26, 00:20 UTCJun 26, 02:34 UTC2h 15m
2026-06-25 EJA591 - Jun 25, 22:29 UTCJun 25, 23:14 UTC45m
2026-06-25 EJA591 - Jun 25, 20:45 UTCJun 25, 21:25 UTC40m
2026-06-25 EJA591 - Jun 25, 15:29 UTCJun 25, 17:09 UTC1h 40m
2026-06-25 EJA591 - Jun 25, 00:29 UTCJun 25, 00:55 UTC25m
2026-06-24 EJA591 - Jun 24, 22:00 UTCJun 24, 23:20 UTC1h 20m
2026-06-24 EJA591 - Jun 24, 19:39 UTCJun 24, 20:49 UTC1h 10m
2026-06-24 EJA591 - Jun 24, 15:05 UTCJun 24, 17:29 UTC2h 25m
2026-06-24 EJA591 - Jun 24, 13:30 UTCJun 24, 13:44 UTC15m
2026-06-24 EJA591 - Jun 24, 02:40 UTCJun 24, 04:55 UTC2h 15m
2026-06-23 EJA591 AUS → SAN Jun 23, 22:34 UTCJun 24, 01:19 UTC2h 45m
2026-06-23 EJA591 - Jun 23, 19:15 UTCJun 23, 21:45 UTC2h 30m
2026-06-23 EJA591 - Jun 23, 17:09 UTCJun 23, 17:44 UTC35m
2026-06-22 EJA591 - Jun 22, 18:49 UTCJun 22, 21:10 UTC2h 20m
2026-06-22 EJA591 - Jun 22, 15:29 UTCJun 22, 18:04 UTC2h 35m
2026-06-22 EJA591 - Jun 22, 12:05 UTCJun 22, 12:34 UTC30m
2026-06-22 EJA591 - Jun 22, 03:45 UTCJun 22, 06:10 UTC2h 25m
2026-06-22 EJA591 TEB → MDW Jun 22, 00:34 UTCJun 22, 02:34 UTC2h 0m
2026-06-21 EJA591 - Jun 21, 19:09 UTCJun 21, 20:05 UTC55m
2026-06-21 EJA591 BOS → HYA Jun 21, 17:30 UTCJun 21, 17:54 UTC24m
2026-06-21 EJA591 - Jun 21, 15:54 UTCJun 21, 16:14 UTC20m
2026-06-21 EJA591 - Jun 21, 14:05 UTCJun 21, 14:24 UTC20m
2026-06-21 EJA591 - Jun 21, 12:14 UTCJun 21, 13:00 UTC45m
2026-06-20 EJA591 - Jun 20, 22:14 UTCJun 20, 22:25 UTC10m
2026-06-20 EJA591 - Jun 20, 19:55 UTCJun 20, 21:19 UTC1h 25m
2026-06-20 EJA591 - Jun 20, 15:04 UTCJun 20, 16:55 UTC1h 50m
2026-06-19 EJA591 OKC → AFW Jun 19, 22:34 UTCJun 19, 23:09 UTC35m

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 N591QS page for operator, model, and routing details .

Mode-S A7A28D frequently asked

What is Mode-S code A7A28D?
A7A28D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N591QS.
Where is Mode-S A7A28D registered?
Mode-S code A7A28D 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 A7A28D broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7A28D, octal 51721215, decimal 10,986,125.
What flights does A7A28D operate?
Mode-S A7A28D has broadcast 2 distinct callsigns, including EJA591, N591QS.