Apparatus

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sensors Mode-S transponder

AC55C1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N894SA · DIAMOND DA-40 Club Star · operated by UTAH STATE UNIVERSITY

Hex
AC55C1
Octal
53052701
Decimal
11,294,145
Country
US
Tail
N894SA
Type
DA40
No current signal · last broadcast 8d ago
Flights observed
208
Distinct callsigns
1
Country
US
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S AC55C1.

Country allocation

The ICAO 24-bit address AC55C1 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
N894SA - 208 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N894SA LGU → LGU Jul 26, 16:00 UTCJul 26, 17:25 UTC1h 25m
2026-07-25 N894SA - Jul 25, 19:15 UTCJul 25, 20:20 UTC1h 5m
2026-07-25 N894SA - Jul 25, 13:30 UTCJul 25, 14:40 UTC1h 10m
2026-07-24 N894SA LGU → LGU Jul 24, 17:00 UTCJul 24, 19:40 UTC2h 40m
2026-07-23 N894SA - Jul 23, 22:00 UTCJul 23, 22:40 UTC40m
2026-07-23 N894SA - Jul 23, 15:45 UTCJul 23, 16:45 UTC1h 0m
2026-07-22 N894SA LGU → LGU Jul 22, 15:15 UTCJul 22, 16:20 UTC1h 5m
2026-07-21 N894SA LGU → LGU Jul 21, 18:35 UTCJul 21, 19:45 UTC1h 10m
2026-07-21 N894SA LGU → LGU Jul 21, 00:10 UTCJul 21, 01:00 UTC50m
2026-07-20 N894SA LGU → LGU Jul 20, 19:40 UTCJul 20, 19:45 UTC5m
2026-07-20 N894SA LGU → LGU Jul 20, 16:15 UTCJul 20, 17:45 UTC1h 30m
2026-07-20 N894SA LGU → LGU Jul 20, 14:20 UTCJul 20, 14:35 UTC15m
2026-07-19 N894SA - Jul 19, 15:15 UTCJul 19, 15:50 UTC35m
2026-07-19 N894SA - Jul 19, 14:20 UTCJul 19, 14:35 UTC15m
2026-07-19 N894SA - Jul 19, 00:50 UTCJul 19, 02:00 UTC1h 10m
2026-07-18 N894SA LGU → LGU Jul 18, 22:50 UTCJul 19, 00:10 UTC1h 20m
2026-07-18 N894SA LGU → LGU Jul 18, 17:45 UTCJul 18, 18:45 UTC1h 0m
2026-07-18 N894SA - Jul 18, 15:00 UTCJul 18, 16:00 UTC1h 0m
2026-07-18 N894SA LGU → PVU Jul 18, 12:40 UTCJul 18, 13:45 UTC1h 5m
2026-07-18 N894SA - Jul 18, 06:20 UTCJul 18, 07:20 UTC1h 0m
2026-07-18 N894SA - Jul 18, 04:35 UTCJul 18, 05:40 UTC1h 5m
2026-07-17 N894SA - Jul 17, 16:55 UTCJul 17, 18:40 UTC1h 45m
2026-07-17 N894SA LGU → LGU Jul 17, 14:30 UTCJul 17, 16:15 UTC1h 45m
2026-07-16 N894SA LGU → LGU Jul 16, 16:05 UTCJul 16, 16:35 UTC30m
2026-07-16 N894SA LGU → LGU Jul 16, 14:35 UTCJul 16, 15:19 UTC45m
2026-07-15 N894SA - Jul 15, 22:55 UTCJul 16, 00:00 UTC1h 5m
2026-07-15 N894SA LGU → LGU Jul 15, 18:25 UTCJul 15, 19:35 UTC1h 10m
2026-07-15 N894SA - Jul 15, 16:20 UTCJul 15, 17:25 UTC1h 5m
2026-07-15 N894SA - Jul 15, 15:05 UTCJul 15, 15:10 UTC5m
2026-07-14 N894SA LGU → LGU Jul 14, 19:35 UTCJul 14, 20:35 UTC1h 0m
2026-07-14 N894SA - Jul 14, 13:50 UTCJul 14, 14:15 UTC25m
2026-07-13 N894SA - Jul 13, 19:05 UTCJul 13, 20:35 UTC1h 30m
2026-07-13 N894SA LGU → LGU Jul 13, 17:05 UTCJul 13, 18:25 UTC1h 20m
2026-07-11 N894SA - Jul 11, 17:00 UTCJul 11, 17:30 UTC30m
2026-07-11 N894SA - Jul 11, 14:40 UTCJul 11, 15:30 UTC50m
2026-07-11 N894SA LGU → LGU Jul 11, 12:40 UTCJul 11, 14:05 UTC1h 25m
2026-07-10 N894SA LGU → LGU Jul 10, 22:35 UTCJul 11, 00:00 UTC1h 25m
2026-07-10 N894SA LGU → LGU Jul 10, 16:20 UTCJul 10, 17:20 UTC1h 0m
2026-07-10 N894SA LGU → LGU Jul 10, 13:25 UTCJul 10, 14:35 UTC1h 10m
2026-07-09 N894SA - Jul 9, 22:20 UTCJul 9, 23:05 UTC45m
2026-07-09 N894SA - Jul 9, 20:30 UTCJul 9, 21:15 UTC45m
2026-07-09 N894SA LGU → LGU Jul 9, 18:50 UTCJul 9, 19:50 UTC1h 0m
2026-07-09 N894SA LGU → LGU Jul 9, 18:35 UTCJul 9, 18:45 UTC10m
2026-07-09 N894SA LGU → LGU Jul 9, 15:45 UTCJul 9, 16:50 UTC1h 5m
2026-07-09 N894SA LGU → LGU Jul 9, 01:15 UTCJul 9, 02:00 UTC45m
2026-07-08 N894SA LGU → LGU Jul 8, 18:20 UTCJul 8, 18:25 UTC5m
2026-07-07 N894SA LGU → LGU Jul 7, 18:50 UTCJul 7, 20:05 UTC1h 15m
2026-07-07 N894SA - Jul 7, 16:40 UTCJul 7, 17:35 UTC55m
2026-07-07 N894SA - Jul 7, 14:30 UTCJul 7, 15:55 UTC1h 25m
2026-07-06 N894SA LGU → LGU Jul 6, 18:15 UTCJul 6, 19:35 UTC1h 20m

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 N894SA page for operator, model, and routing details .

Mode-S AC55C1 frequently asked

What is Mode-S code AC55C1?
AC55C1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N894SA.
Where is Mode-S AC55C1 registered?
Mode-S code AC55C1 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 AC55C1 broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC55C1, octal 53052701, decimal 11,294,145.
What flights does AC55C1 operate?
Mode-S AC55C1 has broadcast 1 distinct callsign, including N894SA.