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sensors Mode-S transponder

A178A3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N194SM · CESSNA 208 Caravan · operated by SURVEYING AND MAPPING LLC

Hex
A178A3
Octal
50274243
Decimal
10,582,179
Country
US
Tail
N194SM
Type
C208
No current signal · last broadcast Jul 12, 18:30 UTC
Flights observed
78
Distinct callsigns
1
Country
US
Last broadcast
Jul 12, 18:30 UTC

Last known position

Most recent position reported by Mode-S A178A3.

Country allocation

The ICAO 24-bit address A178A3 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
N194SM - 78 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 N194SM - Jul 12, 17:55 UTCJul 12, 18:30 UTC35m
2026-07-09 N194SM - Jul 9, 23:05 UTCJul 9, 23:45 UTC40m
2026-07-09 N194SM - Jul 9, 14:05 UTCJul 9, 14:30 UTC25m
2026-07-08 N194SM - Jul 8, 20:20 UTCJul 8, 21:45 UTC1h 25m
2026-07-08 N194SM - Jul 8, 19:20 UTCJul 8, 19:45 UTC25m
2026-07-08 N194SM - Jul 8, 18:15 UTCJul 8, 18:35 UTC20m
2026-07-08 N194SM - Jul 8, 13:10 UTCJul 8, 16:30 UTC3h 20m
2026-07-05 N194SM - Jul 5, 14:55 UTCJul 5, 15:25 UTC30m
2026-07-05 N194SM - Jul 5, 14:10 UTCJul 5, 14:20 UTC10m
2026-07-04 N194SM - Jul 4, 16:05 UTCJul 4, 17:25 UTC1h 20m
2026-07-04 N194SM - Jul 4, 12:30 UTCJul 4, 12:45 UTC15m
2026-07-03 N194SM - Jul 3, 21:40 UTCJul 3, 22:30 UTC50m
2026-07-03 N194SM - Jul 3, 19:55 UTCJul 3, 21:05 UTC1h 10m
2026-07-03 N194SM - Jul 3, 14:35 UTCJul 3, 15:05 UTC30m
2026-07-02 N194SM - Jul 2, 21:15 UTCJul 2, 23:15 UTC2h 0m
2026-07-02 N194SM - Jul 2, 19:25 UTCJul 2, 19:35 UTC10m
2026-07-02 N194SM - Jul 2, 15:10 UTCJul 2, 15:30 UTC20m
2026-07-01 N194SM - Jul 1, 22:15 UTCJul 1, 22:35 UTC20m
2026-07-01 N194SM - Jul 1, 13:55 UTCJul 1, 14:15 UTC20m
2026-06-30 N194SM - Jun 30, 15:55 UTCJun 30, 16:55 UTC1h 0m
2026-06-30 N194SM - Jun 30, 14:30 UTCJun 30, 14:45 UTC15m
2026-06-25 N194SM - Jun 25, 22:29 UTCJun 25, 22:39 UTC10m
2026-06-25 N194SM - Jun 25, 19:54 UTCJun 25, 21:25 UTC1h 30m
2026-06-25 N194SM - Jun 25, 17:05 UTCJun 25, 17:54 UTC50m
2026-06-25 N194SM - Jun 25, 14:39 UTCJun 25, 15:04 UTC25m
2026-06-24 N194SM - Jun 24, 23:24 UTCJun 24, 23:34 UTC10m
2026-06-24 N194SM - Jun 24, 21:04 UTCJun 24, 22:49 UTC1h 45m
2026-06-24 N194SM - Jun 24, 16:05 UTCJun 24, 18:55 UTC2h 50m
2026-06-24 N194SM - Jun 24, 14:55 UTCJun 24, 15:14 UTC20m
2026-06-20 N194SM - Jun 20, 20:09 UTCJun 20, 20:29 UTC20m
2026-06-20 N194SM - Jun 20, 19:24 UTCJun 20, 19:34 UTC10m
2026-06-20 N194SM - Jun 20, 14:19 UTCJun 20, 17:39 UTC3h 20m
2026-06-20 N194SM - Jun 20, 13:14 UTCJun 20, 13:34 UTC20m
2026-06-19 N194SM - Jun 19, 13:14 UTCJun 19, 14:15 UTC1h 0m
2026-06-17 N194SM - Jun 17, 13:50 UTCJun 17, 15:05 UTC1h 15m
2026-06-16 N194SM - Jun 16, 15:45 UTCJun 16, 17:49 UTC2h 5m
2026-06-16 N194SM - Jun 16, 13:19 UTCJun 16, 15:09 UTC1h 50m
2026-06-14 N194SM - Jun 14, 14:10 UTCJun 14, 15:35 UTC1h 25m
2026-06-14 N194SM - Jun 14, 13:10 UTCJun 14, 13:25 UTC15m
2026-06-13 N194SM - Jun 13, 20:30 UTCJun 13, 21:10 UTC40m
2026-06-13 N194SM - Jun 13, 18:20 UTCJun 13, 18:30 UTC10m
2026-06-13 N194SM - Jun 13, 15:25 UTCJun 13, 15:40 UTC15m
2026-06-13 N194SM - Jun 13, 14:20 UTCJun 13, 14:40 UTC20m
2026-06-09 N194SM - Jun 9, 13:30 UTCJun 9, 14:40 UTC1h 10m
2026-06-08 N194SM - Jun 8, 21:05 UTCJun 8, 21:20 UTC15m
2026-06-08 N194SM - Jun 8, 15:45 UTCJun 8, 18:55 UTC3h 10m
2026-06-06 N194SM - Jun 6, 21:40 UTCJun 6, 23:39 UTC2h 0m
2026-06-06 N194SM - Jun 6, 15:25 UTCJun 6, 18:55 UTC3h 30m
2026-06-05 N194SM - Jun 5, 21:15 UTCJun 5, 22:55 UTC1h 40m
2026-06-04 N194SM - Jun 4, 20:30 UTCJun 4, 20:50 UTC20m

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 N194SM page for operator, model, and routing details .

Mode-S A178A3 frequently asked

What is Mode-S code A178A3?
A178A3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N194SM.
Where is Mode-S A178A3 registered?
Mode-S code A178A3 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 A178A3 broadcasting right now?
No active broadcast right now. Last signal was Jul 12, 18:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A178A3, octal 50274243, decimal 10,582,179.
What flights does A178A3 operate?
Mode-S A178A3 has broadcast 1 distinct callsign, including N194SM.