Apparatus

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sensors Mode-S transponder

A491AC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N394AG · CESSNA 560XL Citation XLS · operated by HARMSTRONG AIR LLC, JET STANDARD LLC

Hex
A491AC
Octal
51110654
Decimal
10,785,196
Country
US
Tail
N394AG
Type
C56X
No current signal · last broadcast 2h ago
Flights observed
118
Distinct callsigns
1
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A491AC.

Country allocation

The ICAO 24-bit address A491AC 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
PJC94 - 118 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-12 PJC94 - Jun 12, 19:35 UTCJun 12, 20:45 UTC1h 10m
2026-06-12 PJC94 - Jun 12, 17:00 UTCJun 12, 18:30 UTC1h 30m
2026-06-12 PJC94 - Jun 12, 14:30 UTCJun 12, 15:15 UTC45m
2026-06-11 PJC94 - Jun 11, 22:20 UTCJun 11, 23:05 UTC45m
2026-06-11 PJC94 MMU → LUK Jun 11, 20:20 UTCJun 11, 21:50 UTC1h 30m
2026-06-11 PJC94 - Jun 11, 15:35 UTCJun 11, 16:35 UTC1h 0m
2026-06-11 PJC94 - Jun 11, 13:55 UTCJun 11, 14:50 UTC55m
2026-06-10 PJC94 - Jun 10, 20:05 UTCJun 10, 20:50 UTC45m
2026-06-10 PJC94 - Jun 10, 16:45 UTCJun 10, 19:25 UTC2h 40m
2026-06-10 PJC94 - Jun 10, 14:35 UTCJun 10, 15:10 UTC35m
2026-06-09 PJC94 - Jun 9, 21:50 UTCJun 9, 22:25 UTC35m
2026-06-09 PJC94 - Jun 9, 12:35 UTCJun 9, 13:10 UTC35m
2026-06-08 PJC94 - Jun 8, 16:20 UTCJun 8, 17:10 UTC50m
2026-06-08 PJC94 - Jun 8, 13:40 UTCJun 8, 15:45 UTC2h 5m
2026-06-07 PJC94 - Jun 7, 20:40 UTCJun 7, 22:45 UTC2h 5m
2026-06-07 PJC94 - Jun 7, 17:00 UTCJun 7, 19:55 UTC2h 55m
2026-06-07 PJC94 - Jun 7, 14:50 UTCJun 7, 15:40 UTC50m
2026-06-05 PJC94 - Jun 5, 23:10 UTCJun 6, 00:00 UTC50m
2026-06-05 PJC94 - Jun 5, 20:55 UTCJun 5, 21:25 UTC30m
2026-06-05 PJC94 - Jun 5, 00:00 UTCJun 5, 03:40 UTC3h 40m
2026-06-04 PJC94 - Jun 4, 20:25 UTCJun 4, 20:55 UTC30m
2026-06-04 PJC94 - Jun 4, 01:15 UTCJun 4, 01:45 UTC30m
2026-06-03 PJC94 - Jun 3, 18:45 UTCJun 3, 19:15 UTC30m
2026-06-02 PJC94 - Jun 2, 14:20 UTCJun 2, 15:50 UTC1h 30m
2026-06-01 PJC94 - Jun 1, 18:40 UTCJun 1, 20:00 UTC1h 20m
2026-06-01 PJC94 - Jun 1, 16:55 UTCJun 1, 17:55 UTC1h 0m
2026-06-01 PJC94 - Jun 1, 10:05 UTCJun 1, 12:25 UTC2h 20m
2026-05-31 PJC94 - May 31, 18:50 UTCMay 31, 19:40 UTC50m
2026-05-30 PJC94 - May 30, 16:50 UTCMay 30, 18:40 UTC1h 50m
2026-05-30 PJC94 - May 30, 14:45 UTCMay 30, 15:35 UTC50m
2026-05-28 PJC94 - May 28, 18:50 UTCMay 28, 19:55 UTC1h 5m
2026-05-28 PJC94 - May 28, 15:00 UTCMay 28, 18:00 UTC3h 0m
2026-05-27 PJC94 - May 27, 18:35 UTCMay 27, 19:15 UTC40m
2026-05-27 PJC94 - May 27, 17:15 UTCMay 27, 18:05 UTC50m
2026-05-27 PJC94 - May 27, 13:30 UTCMay 27, 14:15 UTC45m
2026-05-27 PJC94 - May 27, 12:15 UTCMay 27, 12:45 UTC30m
2026-05-26 PJC94 - May 26, 13:54 UTCMay 26, 16:30 UTC2h 35m
2026-05-26 PJC94 - May 26, 12:20 UTCMay 26, 12:30 UTC10m
2026-05-25 PJC94 - May 25, 17:40 UTCMay 25, 21:09 UTC3h 29m
2026-05-23 PJC94 - May 23, 15:35 UTCMay 23, 15:50 UTC15m
2026-05-23 PJC94 - May 23, 13:20 UTCMay 23, 14:05 UTC45m
2026-05-22 PJC94 - May 22, 18:15 UTCMay 22, 20:05 UTC1h 50m
2026-05-22 PJC94 - May 22, 13:05 UTCMay 22, 15:05 UTC2h 0m
2026-05-22 PJC94 - May 22, 10:55 UTCMay 22, 11:40 UTC45m
2026-05-22 PJC94 - May 22, 01:15 UTCMay 22, 02:30 UTC1h 15m
2026-05-21 PJC94 - May 21, 21:20 UTCMay 22, 00:20 UTC3h 0m
2026-05-21 PJC94 - May 21, 18:05 UTCMay 21, 19:10 UTC1h 5m
2026-05-19 PJC94 - May 19, 23:25 UTCMay 20, 00:15 UTC50m
2026-05-19 PJC94 - May 19, 20:20 UTCMay 19, 22:40 UTC2h 20m
2026-05-19 PJC94 - May 19, 14:45 UTCMay 19, 15:35 UTC50m

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 N394AG page for operator, model, and routing details .

Mode-S A491AC frequently asked

What is Mode-S code A491AC?
A491AC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N394AG.
Where is Mode-S A491AC registered?
Mode-S code A491AC 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 A491AC broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A491AC, octal 51110654, decimal 10,785,196.
What flights does A491AC operate?
Mode-S A491AC has broadcast 1 distinct callsign, including PJC94.