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sensors Mode-S transponder

A6191C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N492SF · CESSNA 172 Skyhawk · operated by SNOHOMISH FLYING SERVICE INC

Hex
A6191C
Octal
51414434
Decimal
10,885,404
Country
US
Tail
N492SF
Type
C172
No current signal · last broadcast Jul 26, 20:50 UTC
Flights observed
316
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 20:50 UTC

Last known position

Most recent position reported by Mode-S A6191C.

Country allocation

The ICAO 24-bit address A6191C 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
N492SF - 316 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N492SF - Jul 26, 20:00 UTCJul 26, 20:50 UTC50m
2026-07-26 N492SF - Jul 26, 18:15 UTCJul 26, 19:15 UTC1h 0m
2026-07-25 N492SF - Jul 25, 18:30 UTCJul 25, 19:55 UTC1h 25m
2026-07-25 N492SF - Jul 25, 16:05 UTCJul 25, 17:50 UTC1h 45m
2026-07-25 N492SF - Jul 25, 03:05 UTCJul 25, 03:45 UTC40m
2026-07-25 N492SF - Jul 25, 01:15 UTCJul 25, 02:20 UTC1h 5m
2026-07-24 N492SF - Jul 24, 23:20 UTCJul 25, 00:00 UTC40m
2026-07-24 N492SF - Jul 24, 22:40 UTCJul 24, 23:15 UTC35m
2026-07-24 N492SF - Jul 24, 20:55 UTCJul 24, 21:30 UTC35m
2026-07-24 N492SF - Jul 24, 15:05 UTCJul 24, 16:20 UTC1h 15m
2026-07-24 N492SF - Jul 24, 02:35 UTCJul 24, 03:20 UTC45m
2026-07-24 N492SF - Jul 24, 01:00 UTCJul 24, 01:35 UTC35m
2026-07-23 N492SF - Jul 23, 21:55 UTCJul 23, 23:00 UTC1h 5m
2026-07-23 N492SF - Jul 23, 19:20 UTCJul 23, 20:35 UTC1h 15m
2026-07-23 N492SF - Jul 23, 17:45 UTCJul 23, 18:05 UTC20m
2026-07-23 N492SF - Jul 23, 03:15 UTCJul 23, 04:15 UTC1h 0m
2026-07-23 N492SF - Jul 23, 00:50 UTCJul 23, 01:55 UTC1h 5m
2026-07-22 N492SF - Jul 22, 21:00 UTCJul 22, 21:15 UTC15m
2026-07-22 N492SF - Jul 22, 16:45 UTCJul 22, 17:30 UTC45m
2026-07-21 N492SF - Jul 21, 22:25 UTCJul 22, 00:00 UTC1h 35m
2026-07-21 N492SF - Jul 21, 21:05 UTCJul 21, 21:45 UTC40m
2026-07-21 N492SF - Jul 21, 16:10 UTCJul 21, 16:55 UTC45m
2026-07-21 N492SF - Jul 21, 01:30 UTCJul 21, 03:25 UTC1h 55m
2026-07-20 N492SF - Jul 20, 23:15 UTCJul 21, 00:25 UTC1h 9m
2026-07-20 N492SF - Jul 20, 19:25 UTCJul 20, 20:25 UTC1h 0m
2026-07-20 N492SF - Jul 20, 15:35 UTCJul 20, 16:45 UTC1h 10m
2026-07-20 N492SF - Jul 20, 04:40 UTCJul 20, 05:55 UTC1h 15m
2026-07-20 N492SF - Jul 20, 00:45 UTCJul 20, 01:50 UTC1h 5m
2026-07-19 N492SF - Jul 19, 22:05 UTCJul 20, 00:10 UTC2h 5m
2026-07-19 N492SF - Jul 19, 20:00 UTCJul 19, 21:05 UTC1h 5m
2026-07-19 N492SF - Jul 19, 18:25 UTCJul 19, 19:25 UTC1h 0m
2026-07-19 N492SF - Jul 19, 01:35 UTCJul 19, 02:50 UTC1h 15m
2026-07-18 N492SF - Jul 18, 23:00 UTCJul 19, 00:05 UTC1h 5m
2026-07-18 N492SF - Jul 18, 20:30 UTCJul 18, 21:00 UTC30m
2026-07-18 N492SF - Jul 18, 18:25 UTCJul 18, 19:20 UTC55m
2026-07-18 N492SF - Jul 18, 16:30 UTCJul 18, 17:20 UTC50m
2026-07-17 N492SF - Jul 17, 22:45 UTCJul 17, 23:14 UTC30m
2026-07-17 N492SF - Jul 17, 20:40 UTCJul 17, 21:30 UTC50m
2026-07-17 N492SF - Jul 17, 17:55 UTCJul 17, 18:44 UTC50m
2026-07-17 N492SF - Jul 17, 16:00 UTCJul 17, 16:34 UTC35m
2026-07-16 N492SF - Jul 16, 17:05 UTCJul 16, 18:55 UTC1h 50m
2026-07-15 N492SF - Jul 15, 22:10 UTCJul 15, 22:40 UTC30m
2026-07-15 N492SF - Jul 15, 19:40 UTCJul 15, 20:55 UTC1h 15m
2026-07-15 N492SF - Jul 15, 17:55 UTCJul 15, 18:55 UTC1h 0m
2026-07-15 N492SF - Jul 15, 02:35 UTCJul 15, 03:35 UTC1h 0m
2026-07-15 N492SF - Jul 15, 00:30 UTCJul 15, 01:25 UTC55m
2026-07-14 N492SF - Jul 14, 22:00 UTCJul 14, 23:20 UTC1h 19m
2026-07-14 N492SF - Jul 14, 20:10 UTCJul 14, 21:20 UTC1h 10m
2026-07-14 N492SF - Jul 14, 18:35 UTCJul 14, 19:30 UTC55m
2026-07-14 N492SF - Jul 14, 17:15 UTCJul 14, 18:00 UTC45m

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 N492SF page for operator, model, and routing details .

Mode-S A6191C frequently asked

What is Mode-S code A6191C?
A6191C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N492SF.
Where is Mode-S A6191C registered?
Mode-S code A6191C 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 A6191C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6191C, octal 51414434, decimal 10,885,404.
What flights does A6191C operate?
Mode-S A6191C has broadcast 1 distinct callsign, including N492SF.