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sensors Mode-S transponder

AC0921

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N875CF · operated by PARAGON AIRPLANE LEASING CO

Hex
AC0921
Octal
53004441
Decimal
11,274,529
Country
US
Tail
N875CF
Type
P28A
No current signal · last broadcast Jul 26, 17:45 UTC
Flights observed
276
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 17:45 UTC

Last known position

Most recent position reported by Mode-S AC0921.

Country allocation

The ICAO 24-bit address AC0921 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
N875CF - 276 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N875CF - Jul 26, 16:25 UTCJul 26, 17:45 UTC1h 20m
2026-07-25 N875CF - Jul 25, 19:40 UTCJul 25, 20:40 UTC1h 0m
2026-07-25 N875CF FMY → FMY Jul 25, 13:25 UTCJul 25, 13:55 UTC30m
2026-07-25 N875CF - Jul 25, 11:15 UTCJul 25, 12:35 UTC1h 20m
2026-07-24 N875CF FMY → FMY Jul 24, 16:25 UTCJul 24, 17:40 UTC1h 15m
2026-07-24 N875CF - Jul 24, 14:35 UTCJul 24, 15:10 UTC35m
2026-07-24 N875CF - Jul 24, 13:20 UTCJul 24, 13:45 UTC25m
2026-07-23 N875CF FMY → FMY Jul 23, 23:35 UTCJul 24, 00:10 UTC35m
2026-07-23 N875CF - Jul 23, 21:45 UTCJul 23, 22:40 UTC55m
2026-07-23 N875CF - Jul 23, 19:35 UTCJul 23, 20:30 UTC55m
2026-07-23 N875CF - Jul 23, 16:40 UTCJul 23, 18:30 UTC1h 50m
2026-07-23 N875CF FMY → FMY Jul 23, 14:40 UTCJul 23, 15:25 UTC45m
2026-07-23 N875CF - Jul 23, 12:00 UTCJul 23, 12:45 UTC45m
2026-07-22 N875CF FMY → FMY Jul 22, 17:30 UTCJul 22, 18:55 UTC1h 25m
2026-07-22 N875CF FMY → FMY Jul 22, 15:35 UTCJul 22, 16:35 UTC1h 0m
2026-07-22 N875CF - Jul 22, 12:25 UTCJul 22, 13:35 UTC1h 10m
2026-07-22 N875CF - Jul 22, 01:30 UTCJul 22, 03:00 UTC1h 30m
2026-07-21 N875CF - Jul 21, 17:55 UTCJul 21, 19:35 UTC1h 40m
2026-07-21 N875CF - Jul 21, 14:30 UTCJul 21, 15:25 UTC55m
2026-07-21 N875CF - Jul 21, 12:35 UTCJul 21, 13:45 UTC1h 10m
2026-07-21 N875CF FMY → FMY Jul 21, 02:35 UTCJul 21, 02:55 UTC20m
2026-07-18 N875CF - Jul 18, 18:30 UTCJul 18, 19:20 UTC50m
2026-07-18 N875CF - Jul 18, 16:35 UTCJul 18, 17:30 UTC55m
2026-07-17 N875CF - Jul 17, 23:30 UTCJul 18, 00:35 UTC1h 5m
2026-07-17 N875CF FMY → FMY Jul 17, 19:45 UTCJul 17, 20:44 UTC1h 0m
2026-07-17 N875CF - Jul 17, 12:25 UTCJul 17, 13:15 UTC50m
2026-07-17 N875CF - Jul 17, 00:35 UTCJul 17, 01:39 UTC1h 5m
2026-07-16 N875CF - Jul 16, 20:49 UTCJul 16, 21:40 UTC50m
2026-07-16 N875CF FMY → FMY Jul 16, 18:34 UTCJul 16, 19:30 UTC55m
2026-07-16 N875CF - Jul 16, 16:35 UTCJul 16, 17:40 UTC1h 5m
2026-07-16 N875CF FMY → FMY Jul 16, 14:25 UTCJul 16, 15:19 UTC55m
2026-07-16 N875CF - Jul 16, 12:44 UTCJul 16, 13:34 UTC50m
2026-07-16 N875CF FMY → FMY Jul 16, 00:20 UTCJul 16, 01:25 UTC1h 5m
2026-07-15 N875CF - Jul 15, 21:40 UTCJul 15, 22:35 UTC55m
2026-07-15 N875CF - Jul 15, 19:20 UTCJul 15, 20:35 UTC1h 15m
2026-07-15 N875CF - Jul 15, 17:45 UTCJul 15, 18:45 UTC1h 0m
2026-07-15 N875CF - Jul 15, 15:40 UTCJul 15, 16:35 UTC55m
2026-07-15 N875CF - Jul 15, 10:35 UTCJul 15, 12:35 UTC2h 0m
2026-07-14 N875CF FMY → FMY Jul 14, 19:30 UTCJul 14, 20:20 UTC50m
2026-07-14 N875CF - Jul 14, 15:35 UTCJul 14, 16:40 UTC1h 5m
2026-07-14 N875CF FMY → FMY Jul 14, 13:25 UTCJul 14, 14:40 UTC1h 15m
2026-07-13 N875CF FMY → FMY Jul 13, 20:45 UTCJul 13, 21:30 UTC45m
2026-07-13 N875CF FMY → FMY Jul 13, 15:30 UTCJul 13, 16:30 UTC1h 0m
2026-07-13 N875CF FMY → FMY Jul 13, 11:25 UTCJul 13, 12:35 UTC1h 10m
2026-07-12 N875CF - Jul 12, 17:30 UTCJul 12, 18:40 UTC1h 10m
2026-07-12 N875CF - Jul 12, 14:25 UTCJul 12, 15:01 UTC35m
2026-07-11 N875CF FMY → FMY Jul 11, 21:35 UTCJul 11, 22:50 UTC1h 15m
2026-07-11 N875CF - Jul 11, 17:35 UTCJul 11, 18:45 UTC1h 10m
2026-07-11 N875CF FMY → FMY Jul 11, 13:45 UTCJul 11, 15:30 UTC1h 45m
2026-07-11 N875CF - Jul 11, 11:25 UTCJul 11, 12:40 UTC1h 15m

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 N875CF page for operator, model, and routing details .

Mode-S AC0921 frequently asked

What is Mode-S code AC0921?
AC0921 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N875CF.
Where is Mode-S AC0921 registered?
Mode-S code AC0921 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 AC0921 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC0921, octal 53004441, decimal 11,274,529.
What flights does AC0921 operate?
Mode-S AC0921 has broadcast 1 distinct callsign, including N875CF.