Apparatus

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sensors Mode-S transponder

A83439

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N628CT · operated by ALF IX LLC

Hex
A83439
Octal
52032071
Decimal
11,023,417
Country
US
Tail
N628CT
Type
C172
No current signal · last broadcast 19h ago
Flights observed
189
Distinct callsigns
1
Country
US
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S A83439.

Country allocation

The ICAO 24-bit address A83439 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
N628CT - 189 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 N628CT - Jul 17, 17:25 UTCJul 17, 17:44 UTC20m
2026-07-17 N628CT - Jul 17, 16:15 UTCJul 17, 16:44 UTC30m
2026-07-15 N628CT DBQ → DBQ Jul 15, 22:10 UTCJul 15, 23:35 UTC1h 25m
2026-07-15 N628CT DBQ → DBQ Jul 15, 19:40 UTCJul 15, 20:40 UTC1h 0m
2026-07-15 N628CT DBQ → DBQ Jul 15, 17:45 UTCJul 15, 18:25 UTC40m
2026-07-15 N628CT DBQ → DBQ Jul 15, 15:30 UTCJul 15, 16:30 UTC1h 0m
2026-07-15 N628CT DBQ → DBQ Jul 15, 13:35 UTCJul 15, 14:35 UTC1h 0m
2026-07-14 N628CT DBQ → DBQ Jul 14, 20:35 UTCJul 14, 21:35 UTC1h 0m
2026-07-14 N628CT DBQ → DBQ Jul 14, 13:50 UTCJul 14, 16:40 UTC2h 50m
2026-07-14 N628CT DSM → DBQ Jul 14, 00:00 UTCJul 14, 01:30 UTC1h 30m
2026-07-13 N628CT DBQ → DSM Jul 13, 20:30 UTCJul 13, 21:55 UTC1h 25m
2026-07-13 N628CT - Jul 13, 15:50 UTCJul 13, 18:40 UTC2h 50m
2026-07-13 N628CT DBQ → DBQ Jul 13, 13:55 UTCJul 13, 14:50 UTC55m
2026-07-11 N628CT DBQ → DBQ Jul 11, 15:40 UTCJul 11, 18:25 UTC2h 45m
2026-07-08 N628CT DBQ → DBQ Jul 8, 20:35 UTCJul 8, 21:30 UTC55m
2026-07-08 N628CT DBQ → DBQ Jul 8, 18:45 UTCJul 8, 19:20 UTC35m
2026-07-08 N628CT - Jul 8, 16:55 UTCJul 8, 17:15 UTC20m
2026-07-08 N628CT - Jul 8, 14:25 UTCJul 8, 16:25 UTC2h 0m
2026-07-07 N628CT DBQ → DBQ Jul 7, 19:45 UTCJul 7, 21:40 UTC1h 55m
2026-07-07 N628CT DBQ → DBQ Jul 7, 17:35 UTCJul 7, 18:30 UTC55m
2026-07-07 N628CT DBQ → DBQ Jul 7, 13:40 UTCJul 7, 16:45 UTC3h 5m
2026-07-02 N628CT DBQ → DBQ Jul 2, 16:15 UTCJul 2, 16:45 UTC30m
2026-07-02 N628CT DBQ → DBQ Jul 2, 13:50 UTCJul 2, 14:55 UTC1h 5m
2026-07-01 N628CT DBQ → DBQ Jul 1, 18:55 UTCJul 1, 21:10 UTC2h 15m
2026-07-01 N628CT - Jul 1, 16:55 UTCJul 1, 17:20 UTC25m
2026-07-01 N628CT - Jul 1, 15:55 UTCJul 1, 16:10 UTC15m
2026-07-01 N628CT - Jul 1, 14:45 UTCJul 1, 14:55 UTC10m
2026-07-01 N628CT - Jul 1, 13:50 UTCJul 1, 14:10 UTC20m
2026-06-30 N628CT - Jun 30, 22:20 UTCJun 30, 22:30 UTC10m
2026-06-30 N628CT - Jun 30, 20:30 UTCJun 30, 20:50 UTC20m
2026-06-30 N628CT DBQ → DBQ Jun 30, 16:40 UTCJun 30, 17:30 UTC50m
2026-06-30 N628CT DBQ → DBQ Jun 30, 14:10 UTCJun 30, 15:45 UTC1h 35m
2026-06-29 N628CT DBQ → DBQ Jun 29, 16:29 UTCJun 29, 17:34 UTC1h 5m
2026-06-29 N628CT DBQ → DBQ Jun 29, 13:44 UTCJun 29, 15:14 UTC1h 30m
2026-06-27 N628CT DBQ → DBQ Jun 27, 01:49 UTCJun 27, 04:15 UTC2h 25m
2026-06-26 N628CT DBQ → DBQ Jun 26, 21:15 UTCJun 26, 23:44 UTC2h 30m
2026-06-26 N628CT DBQ → DBQ Jun 26, 17:29 UTCJun 26, 19:04 UTC1h 35m
2026-06-24 N628CT DBQ → DBQ Jun 24, 15:44 UTCJun 24, 16:40 UTC55m
2026-06-23 N628CT DBQ → DBQ Jun 23, 22:55 UTCJun 24, 00:20 UTC1h 25m
2026-06-23 N628CT - Jun 23, 19:04 UTCJun 23, 20:49 UTC1h 45m
2026-06-23 N628CT - Jun 23, 14:55 UTCJun 23, 16:39 UTC1h 45m
2026-06-23 N628CT DBQ → DBQ Jun 23, 12:45 UTCJun 23, 13:45 UTC1h 0m
2026-06-22 N628CT DBQ → DBQ Jun 22, 19:19 UTCJun 22, 22:30 UTC3h 10m
2026-06-22 N628CT DBQ → DBQ Jun 22, 16:40 UTCJun 22, 17:44 UTC1h 5m
2026-06-22 N628CT DBQ → DBQ Jun 22, 14:40 UTCJun 22, 15:24 UTC45m
2026-06-19 N628CT STP → DBQ Jun 19, 02:50 UTCJun 19, 04:19 UTC1h 30m
2026-06-18 N628CT DBQ → STP Jun 18, 21:00 UTCJun 18, 23:05 UTC2h 5m
2026-06-18 N628CT DBQ → DBQ Jun 18, 16:10 UTCJun 18, 17:55 UTC1h 45m
2026-06-18 N628CT - Jun 18, 14:15 UTCJun 18, 14:25 UTC10m
2026-06-18 N628CT - Jun 18, 13:00 UTCJun 18, 13:10 UTC10m

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 N628CT page for operator, model, and routing details .

Mode-S A83439 frequently asked

What is Mode-S code A83439?
A83439 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N628CT.
Where is Mode-S A83439 registered?
Mode-S code A83439 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 A83439 broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A83439, octal 52032071, decimal 11,023,417.
What flights does A83439 operate?
Mode-S A83439 has broadcast 1 distinct callsign, including N628CT.