Apparatus

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sensors Mode-S transponder

AC4A7A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N891QS · operated by TEXTRON AVIATION INC

Hex
AC4A7A
Octal
53045172
Decimal
11,291,258
Country
US
Tail
N891QS
Type
C700
No current signal · last broadcast 3d ago
Flights observed
112
Distinct callsigns
2
Country
US
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S AC4A7A.

Country allocation

The ICAO 24-bit address AC4A7A 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
EJA891 NetJets 102 2026-05-26
N891QS - 10 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-26 EJA891 PIT → EWR May 26, 21:20 UTCMay 26, 22:39 UTC1h 20m
2026-05-26 EJA891 PIT → EWR May 26, 19:05 UTCMay 26, 20:29 UTC1h 25m
2026-05-26 EJA891 PIT → EWR May 26, 16:59 UTCMay 26, 17:15 UTC15m
2026-05-26 EJA891 PIT → EWR May 26, 15:20 UTCMay 26, 15:54 UTC35m
2026-05-26 EJA891 PIT → EWR May 26, 01:10 UTCMay 26, 01:44 UTC35m
2026-05-25 EJA891 PIT → EWR May 25, 23:35 UTCMay 26, 00:00 UTC25m
2026-05-25 EJA891 PIT → EWR May 25, 21:04 UTCMay 25, 22:05 UTC1h 0m
2026-05-25 EJA891 PIT → EWR May 25, 14:20 UTCMay 25, 19:54 UTC5h 35m
2026-05-24 EJA891 PIT → EWR May 24, 18:00 UTCMay 24, 21:50 UTC3h 50m
2026-05-21 EJA891 PIT → EWR May 21, 23:45 UTCMay 22, 00:45 UTC1h 0m
2026-05-21 EJA891 PIT → EWR May 21, 22:05 UTCMay 21, 22:55 UTC50m
2026-05-21 EJA891 PIT → EWR May 21, 17:20 UTCMay 21, 18:10 UTC50m
2026-05-21 N891QS - May 21, 04:00 UTCMay 21, 04:35 UTC35m
2026-05-21 N891QS - May 21, 00:10 UTCMay 21, 00:20 UTC10m
2026-05-20 N891QS - May 20, 23:05 UTCMay 20, 23:20 UTC15m
2026-05-19 N891QS - May 19, 21:10 UTCMay 19, 22:00 UTC50m
2026-05-18 EJA891 PIT → EWR May 18, 22:35 UTCMay 19, 01:00 UTC2h 25m
2026-05-18 N891QS - May 18, 20:05 UTCMay 18, 21:20 UTC1h 15m
2026-05-18 N891QS - May 18, 16:10 UTCMay 18, 16:20 UTC10m
2026-05-17 N891QS - May 17, 05:05 UTCMay 17, 05:30 UTC25m
2026-05-17 N891QS - May 17, 00:20 UTCMay 17, 00:50 UTC30m
2026-05-15 EJA891 PIT → EWR May 15, 23:55 UTCMay 16, 01:40 UTC1h 45m
2026-05-15 EJA891 PIT → EWR May 15, 19:55 UTCMay 15, 22:00 UTC2h 5m
2026-05-15 EJA891 PIT → EWR May 15, 17:50 UTCMay 15, 18:40 UTC50m
2026-05-14 EJA891 PIT → EWR May 14, 23:25 UTCMay 15, 02:10 UTC2h 45m
2026-05-14 EJA891 PIT → EWR May 14, 21:10 UTCMay 14, 21:25 UTC15m
2026-05-14 EJA891 PIT → EWR May 14, 02:25 UTCMay 14, 04:35 UTC2h 10m
2026-05-13 EJA891 PIT → EWR May 13, 23:00 UTCMay 14, 00:55 UTC1h 55m
2026-05-13 EJA891 PIT → EWR May 13, 20:45 UTCMay 13, 22:25 UTC1h 40m
2026-05-13 EJA891 PIT → EWR May 13, 17:20 UTCMay 13, 19:45 UTC2h 25m
2026-05-12 EJA891 PIT → EWR May 12, 22:45 UTCMay 13, 01:00 UTC2h 15m
2026-05-12 EJA891 PIT → EWR May 12, 20:05 UTCMay 12, 20:55 UTC50m
2026-05-12 EJA891 PIT → EWR May 12, 16:50 UTCMay 12, 18:50 UTC2h 0m
2026-05-12 EJA891 PIT → EWR May 12, 15:10 UTCMay 12, 15:30 UTC20m
2026-05-12 EJA891 PIT → EWR May 12, 13:15 UTCMay 12, 13:51 UTC35m
2026-05-11 EJA891 PIT → EWR May 11, 19:35 UTCMay 11, 22:35 UTC2h 59m
2026-05-11 EJA891 PIT → EWR May 11, 19:00 UTCMay 11, 19:05 UTC5m
2026-05-10 EJA891 PIT → EWR May 10, 23:39 UTCMay 11, 01:55 UTC2h 15m
2026-05-10 EJA891 PIT → EWR May 10, 17:59 UTCMay 10, 21:00 UTC3h 0m
2026-05-10 EJA891 PIT → EWR May 10, 16:10 UTCMay 10, 16:25 UTC15m
2026-05-09 EJA891 PIT → EWR May 9, 23:50 UTCMay 10, 01:14 UTC1h 25m
2026-05-09 EJA891 PIT → EWR May 9, 21:50 UTCMay 9, 22:20 UTC30m
2026-05-08 EJA891 PIT → EWR May 8, 17:40 UTCMay 8, 20:10 UTC2h 30m
2026-05-07 EJA891 PIT → EWR May 7, 20:40 UTCMay 8, 00:44 UTC4h 5m
2026-05-07 EJA891 PIT → EWR May 7, 16:30 UTCMay 7, 18:15 UTC1h 45m
2026-05-07 EJA891 PIT → EWR May 7, 14:10 UTCMay 7, 15:40 UTC1h 30m
2026-05-07 EJA891 PIT → EWR May 7, 02:50 UTCMay 7, 03:30 UTC40m
2026-05-06 EJA891 PIT → EWR May 6, 20:40 UTCMay 7, 01:40 UTC5h 0m
2026-05-06 EJA891 PIT → EWR May 6, 13:10 UTCMay 6, 14:40 UTC1h 30m
2026-05-06 EJA891 PIT → EWR May 6, 11:30 UTCMay 6, 12:01 UTC30m

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 N891QS page for operator, model, and routing details .

Mode-S AC4A7A frequently asked

What is Mode-S code AC4A7A?
AC4A7A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N891QS.
Where is Mode-S AC4A7A registered?
Mode-S code AC4A7A 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 AC4A7A broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC4A7A, octal 53045172, decimal 11,291,258.
What flights does AC4A7A operate?
Mode-S AC4A7A has broadcast 2 distinct callsigns, including EJA891, N891QS.