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sensors Mode-S transponder

A8CD91

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N6665G · CESSNA 172 Skyhawk · operated by PURDUE AVIATION LLC

Hex
A8CD91
Octal
52146621
Decimal
11,062,673
Country
US
Tail
N6665G
Type
C172
No current signal · last broadcast 1h ago
Flights observed
278
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A8CD91.

Country allocation

The ICAO 24-bit address A8CD91 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
N6665G - 278 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N6665G - Jul 14, 13:40 UTCJul 14, 15:00 UTC1h 20m
2026-07-13 N6665G LAF → LAF Jul 13, 23:55 UTCJul 14, 00:50 UTC55m
2026-07-13 N6665G - Jul 13, 21:35 UTCJul 13, 22:50 UTC1h 15m
2026-07-13 N6665G - Jul 13, 19:45 UTCJul 13, 20:50 UTC1h 5m
2026-07-13 N6665G - Jul 13, 17:45 UTCJul 13, 18:55 UTC1h 10m
2026-07-13 N6665G LAF → LAF Jul 13, 15:25 UTCJul 13, 16:40 UTC1h 15m
2026-07-13 N6665G - Jul 13, 13:00 UTCJul 13, 14:20 UTC1h 20m
2026-07-12 N6665G LAF → LAF Jul 12, 20:55 UTCJul 12, 22:15 UTC1h 20m
2026-07-12 N6665G LAF → LAF Jul 12, 14:20 UTCJul 12, 15:40 UTC1h 20m
2026-07-11 N6665G - Jul 11, 20:05 UTCJul 11, 20:15 UTC10m
2026-07-10 N6665G LAF → LAF Jul 10, 21:40 UTCJul 10, 22:55 UTC1h 15m
2026-07-10 N6665G LAF → LAF Jul 10, 00:05 UTCJul 10, 00:30 UTC25m
2026-07-09 N6665G - Jul 9, 19:50 UTCJul 9, 21:00 UTC1h 10m
2026-07-09 N6665G - Jul 9, 17:45 UTCJul 9, 19:00 UTC1h 15m
2026-07-09 N6665G LAF → LAF Jul 9, 15:45 UTCJul 9, 16:55 UTC1h 10m
2026-07-09 N6665G LAF → LAF Jul 9, 01:05 UTCJul 9, 01:30 UTC25m
2026-07-08 N6665G - Jul 8, 22:00 UTCJul 8, 22:50 UTC50m
2026-07-08 N6665G LAF → LAF Jul 8, 17:30 UTCJul 8, 19:00 UTC1h 30m
2026-07-08 N6665G - Jul 8, 15:35 UTCJul 8, 16:50 UTC1h 15m
2026-07-08 N6665G - Jul 8, 13:45 UTCJul 8, 14:55 UTC1h 10m
2026-07-08 N6665G - Jul 8, 00:10 UTCJul 8, 01:25 UTC1h 15m
2026-07-07 N6665G - Jul 7, 19:40 UTCJul 7, 20:50 UTC1h 10m
2026-07-07 N6665G LAF → LAF Jul 7, 17:45 UTCJul 7, 18:30 UTC45m
2026-07-07 N6665G LAF → LAF Jul 7, 15:50 UTCJul 7, 16:45 UTC55m
2026-07-07 N6665G - Jul 7, 14:30 UTCJul 7, 14:50 UTC20m
2026-07-07 N6665G - Jul 7, 03:15 UTCJul 7, 04:20 UTC1h 5m
2026-07-07 N6665G - Jul 7, 00:30 UTCJul 7, 01:45 UTC1h 15m
2026-07-06 N6665G - Jul 6, 21:00 UTCJul 6, 21:55 UTC55m
2026-07-06 N6665G LAF → LAF Jul 6, 16:40 UTCJul 6, 17:55 UTC1h 15m
2026-07-05 N6665G LAF → LAF Jul 5, 19:50 UTCJul 5, 20:20 UTC30m
2026-07-04 N6665G LAF → LAF Jul 4, 16:50 UTCJul 4, 17:45 UTC55m
2026-07-03 N6665G LAF → LAF Jul 3, 18:15 UTCJul 3, 19:35 UTC1h 20m
2026-07-03 N6665G LAF → LAF Jul 3, 16:25 UTCJul 3, 17:35 UTC1h 10m
2026-07-01 N6665G - Jul 1, 13:40 UTCJul 1, 15:15 UTC1h 35m
2026-06-30 N6665G - Jun 30, 21:45 UTCJun 30, 22:50 UTC1h 5m
2026-06-30 N6665G LAF → LAF Jun 30, 15:45 UTCJun 30, 16:35 UTC50m
2026-06-30 N6665G - Jun 30, 00:30 UTCJun 30, 00:45 UTC15m
2026-06-29 N6665G - Jun 29, 23:14 UTCJun 29, 23:44 UTC30m
2026-06-29 N6665G - Jun 29, 19:35 UTCJun 29, 20:49 UTC1h 15m
2026-06-29 N6665G - Jun 29, 15:34 UTCJun 29, 16:35 UTC1h 0m
2026-06-28 N6665G - Jun 28, 18:40 UTCJun 28, 19:44 UTC1h 5m
2026-06-28 N6665G LAF → LAF Jun 28, 15:34 UTCJun 28, 16:39 UTC1h 5m
2026-06-27 N6665G LAF → LAF Jun 27, 23:34 UTCJun 28, 00:20 UTC45m
2026-06-27 N6665G LAF → LAF Jun 27, 12:50 UTCJun 27, 14:29 UTC1h 40m
2026-06-25 N6665G LAF → LAF Jun 25, 18:45 UTCJun 25, 19:29 UTC45m
2026-06-25 N6665G LAF → LAF Jun 25, 16:45 UTCJun 25, 17:34 UTC50m
2026-06-24 N6665G - Jun 24, 23:04 UTCJun 24, 23:24 UTC20m
2026-06-24 N6665G - Jun 24, 21:50 UTCJun 24, 22:14 UTC25m
2026-06-24 N6665G - Jun 24, 19:44 UTCJun 24, 20:54 UTC1h 10m
2026-06-24 N6665G - Jun 24, 17:25 UTCJun 24, 18:15 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 N6665G page for operator, model, and routing details .

Mode-S A8CD91 frequently asked

What is Mode-S code A8CD91?
A8CD91 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N6665G.
Where is Mode-S A8CD91 registered?
Mode-S code A8CD91 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 A8CD91 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8CD91, octal 52146621, decimal 11,062,673.
What flights does A8CD91 operate?
Mode-S A8CD91 has broadcast 1 distinct callsign, including N6665G.