Apparatus

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sensors Mode-S transponder

A6141A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N491D · PIPER PA-28-140/150/160/180 · operated by KEY CITY FLIERS

Hex
A6141A
Octal
51412032
Decimal
10,884,122
Country
US
Tail
N491D
Type
P28A
No current signal · last broadcast 8h ago
Flights observed
99
Distinct callsigns
1
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A6141A.

Country allocation

The ICAO 24-bit address A6141A 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
N491D - 99 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 N491D - Jul 18, 02:35 UTCJul 18, 03:30 UTC56m
2026-07-18 N491D - Jul 18, 02:14 UTCJul 18, 02:29 UTC15m
2026-07-15 N491D - Jul 15, 13:50 UTCJul 15, 16:00 UTC2h 10m
2026-07-14 N491D - Jul 14, 22:25 UTCJul 14, 23:10 UTC44m
2026-07-13 N491D - Jul 13, 15:00 UTCJul 13, 16:05 UTC1h 5m
2026-07-12 N491D DBQ → DBQ Jul 12, 22:05 UTCJul 12, 22:55 UTC50m
2026-07-11 N491D DBQ → DBQ Jul 11, 13:25 UTCJul 11, 14:25 UTC1h 0m
2026-07-10 N491D DBQ → DBQ Jul 10, 23:05 UTCJul 11, 00:15 UTC1h 10m
2026-07-09 N491D - Jul 9, 13:25 UTCJul 9, 13:35 UTC10m
2026-07-09 N491D - Jul 9, 12:35 UTCJul 9, 13:15 UTC40m
2026-07-08 N491D DBQ → DBQ Jul 8, 21:50 UTCJul 8, 23:25 UTC1h 35m
2026-07-08 N491D DBQ → DBQ Jul 8, 18:40 UTCJul 8, 19:55 UTC1h 15m
2026-07-07 N491D - Jul 7, 19:05 UTCJul 7, 20:25 UTC1h 20m
2026-07-07 N491D - Jul 7, 17:40 UTCJul 7, 18:30 UTC50m
2026-07-07 N491D - Jul 7, 13:25 UTCJul 7, 14:10 UTC45m
2026-07-06 N491D DBQ → DBQ Jul 6, 17:35 UTCJul 6, 18:25 UTC50m
2026-07-06 N491D DBQ → DBQ Jul 6, 15:25 UTCJul 6, 16:35 UTC1h 10m
2026-07-06 N491D DBQ → DBQ Jul 6, 13:45 UTCJul 6, 14:30 UTC45m
2026-07-06 N491D DBQ → DBQ Jul 6, 00:35 UTCJul 6, 01:35 UTC1h 0m
2026-07-05 N491D DBQ → DBQ Jul 5, 17:20 UTCJul 5, 18:25 UTC1h 5m
2026-07-05 N491D DBQ → DBQ Jul 5, 14:30 UTCJul 5, 15:40 UTC1h 10m
2026-07-03 N491D DBQ → DBQ Jul 3, 13:55 UTCJul 3, 14:45 UTC50m
2026-07-02 N491D DBQ → DBQ Jul 2, 14:25 UTCJul 2, 15:35 UTC1h 10m
2026-06-27 N491D DBQ → DBQ Jun 27, 22:45 UTCJun 28, 00:15 UTC1h 30m
2026-06-27 N491D DBQ → DBQ Jun 27, 20:39 UTCJun 27, 21:55 UTC1h 15m
2026-06-27 N491D - Jun 27, 18:54 UTCJun 27, 19:15 UTC20m
2026-06-27 N491D - Jun 27, 17:59 UTCJun 27, 18:45 UTC45m
2026-06-26 N491D - Jun 26, 23:19 UTCJun 27, 00:50 UTC1h 30m
2026-06-26 N491D DBQ → DBQ Jun 26, 21:35 UTCJun 26, 22:40 UTC1h 5m
2026-06-26 N491D DBQ → DBQ Jun 26, 18:49 UTCJun 26, 20:15 UTC1h 25m
2026-06-26 N491D DBQ → DBQ Jun 26, 13:10 UTCJun 26, 14:09 UTC1h 0m
2026-06-25 N491D DBQ → DBQ Jun 25, 22:04 UTCJun 25, 23:19 UTC1h 15m
2026-06-25 N491D - Jun 25, 13:29 UTCJun 25, 14:39 UTC1h 10m
2026-06-25 N491D DBQ → DBQ Jun 25, 00:14 UTCJun 25, 01:50 UTC1h 35m
2026-06-24 N491D - Jun 24, 22:39 UTCJun 24, 23:29 UTC50m
2026-06-24 N491D DBQ → DBQ Jun 24, 13:24 UTCJun 24, 14:34 UTC1h 10m
2026-06-23 N491D DBQ → DBQ Jun 23, 19:50 UTCJun 23, 20:44 UTC55m
2026-06-23 N491D DBQ → DBQ Jun 23, 13:29 UTCJun 23, 14:35 UTC1h 5m
2026-06-22 N491D - Jun 22, 16:20 UTCJun 22, 16:45 UTC25m
2026-06-22 N491D - Jun 22, 15:35 UTCJun 22, 16:10 UTC35m
2026-06-20 N491D DBQ → DBQ Jun 20, 18:14 UTCJun 20, 19:15 UTC1h 0m
2026-06-19 N491D - Jun 19, 14:59 UTCJun 19, 16:04 UTC1h 5m
2026-06-19 N491D DBQ → DBQ Jun 19, 12:54 UTCJun 19, 14:44 UTC1h 50m
2026-06-19 N491D DBQ → DBQ Jun 19, 12:44 UTCJun 19, 12:49 UTC5m
2026-06-19 N491D DBQ → DBQ Jun 19, 10:19 UTCJun 19, 10:35 UTC15m
2026-06-12 N491D DBQ → DBQ Jun 12, 15:20 UTCJun 12, 16:45 UTC1h 25m
2026-06-12 N491D DBQ → DBQ Jun 12, 12:55 UTCJun 12, 13:50 UTC55m
2026-06-09 N491D DBQ → DBQ Jun 9, 19:05 UTCJun 9, 19:50 UTC45m
2026-06-09 N491D - Jun 9, 15:35 UTCJun 9, 15:50 UTC15m
2026-06-04 N491D DBQ → DBQ Jun 4, 13:10 UTCJun 4, 14:10 UTC1h 0m

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 N491D page for operator, model, and routing details .

Mode-S A6141A frequently asked

What is Mode-S code A6141A?
A6141A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N491D.
Where is Mode-S A6141A registered?
Mode-S code A6141A 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 A6141A broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6141A, octal 51412032, decimal 10,884,122.
What flights does A6141A operate?
Mode-S A6141A has broadcast 1 distinct callsign, including N491D.