Apparatus

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sensors Mode-S transponder

A4C83C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N407SK · BELL 407 · operated by WEST STATES LEASING INC

Hex
A4C83C
Octal
51144074
Decimal
10,799,164
Country
US
Tail
N407SK
Type
B407
No current signal · last broadcast 10d ago
Flights observed
51
Distinct callsigns
1
Country
US
Last broadcast
10d ago

Last known position

Most recent position reported by Mode-S A4C83C.

Country allocation

The ICAO 24-bit address A4C83C 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
N407SK - 51 2026-05-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-19 N407SK MCC → MCC May 19, 22:20 UTCMay 19, 23:10 UTC50m
2026-05-19 N407SK MCC → MCC May 19, 19:35 UTCMay 19, 19:50 UTC15m
2026-05-19 N407SK MCC → MCC May 19, 17:50 UTCMay 19, 18:05 UTC15m
2026-05-16 N407SK MCC → MCC May 16, 23:05 UTCMay 16, 23:15 UTC10m
2026-05-16 N407SK MCC → MCC May 16, 21:00 UTCMay 16, 21:10 UTC10m
2026-05-15 N407SK - May 15, 19:05 UTCMay 15, 19:15 UTC10m
2026-05-15 N407SK - May 15, 18:20 UTCMay 15, 18:30 UTC10m
2026-05-11 N407SK MCC → MCC May 11, 00:54 UTCMay 11, 01:45 UTC50m
2026-05-09 N407SK - May 9, 18:25 UTCMay 9, 18:50 UTC25m
2026-05-09 N407SK MCC → MCC May 9, 16:15 UTCMay 9, 17:45 UTC1h 30m
2026-05-07 N407SK MCC → MCC May 7, 00:55 UTCMay 7, 01:30 UTC35m
2026-05-06 N407SK MCC → MCC May 6, 16:50 UTCMay 6, 18:35 UTC1h 45m
2026-05-05 N407SK MCC → MCC May 5, 23:45 UTCMay 6, 00:40 UTC55m
2026-05-05 N407SK MCC → MCC May 5, 22:25 UTCMay 5, 23:10 UTC45m
2026-05-05 N407SK - May 5, 21:01 UTCMay 5, 21:15 UTC15m
2026-05-05 N407SK MCC → MCC May 5, 19:40 UTCMay 5, 20:20 UTC40m
2026-05-05 N407SK MCC → MCC May 5, 18:10 UTCMay 5, 18:35 UTC25m
2026-05-02 N407SK - May 2, 01:15 UTCMay 2, 01:50 UTC35m
2026-05-01 N407SK - May 1, 14:10 UTCMay 1, 14:50 UTC40m
2026-04-29 N407SK MCC → MCC Apr 29, 23:00 UTCApr 29, 23:40 UTC39m
2026-04-29 N407SK MCC → MCC Apr 29, 21:45 UTCApr 29, 22:05 UTC20m
2026-04-29 N407SK - Apr 29, 18:50 UTCApr 29, 19:15 UTC25m
2026-04-29 N407SK - Apr 29, 02:09 UTCApr 29, 02:20 UTC10m
2026-04-29 N407SK - Apr 29, 00:45 UTCApr 29, 00:54 UTC10m
2026-04-28 N407SK - Apr 28, 23:29 UTCApr 28, 23:40 UTC10m
2026-04-28 N407SK - Apr 28, 21:45 UTCApr 28, 22:00 UTC15m
2026-04-26 N407SK MCC → MCC Apr 26, 22:30 UTCApr 27, 00:05 UTC1h 35m
2026-04-26 N407SK MCC → MCC Apr 26, 19:00 UTCApr 26, 19:10 UTC10m
2026-04-23 N407SK MCC → MCC Apr 23, 22:30 UTCApr 24, 02:15 UTC3h 45m
2026-04-23 N407SK - Apr 23, 19:35 UTCApr 23, 21:10 UTC1h 35m
2026-04-23 N407SK MCC → MCC Apr 23, 18:00 UTCApr 23, 18:15 UTC15m
2026-04-20 N407SK MCC → MCC Apr 20, 20:00 UTCApr 20, 20:10 UTC10m
2026-04-19 N407SK MCC → MCC Apr 19, 21:50 UTCApr 19, 22:25 UTC35m
2026-04-19 N407SK MCC → MCC Apr 19, 19:55 UTCApr 19, 20:55 UTC1h 0m
2026-04-19 N407SK MCC → MCC Apr 19, 18:05 UTCApr 19, 18:45 UTC40m
2026-04-19 N407SK MCC → MCC Apr 19, 16:30 UTCApr 19, 17:10 UTC40m
2026-04-16 N407SK - Apr 16, 17:35 UTCApr 16, 18:00 UTC25m
2026-04-16 N407SK - Apr 16, 14:15 UTCApr 16, 14:45 UTC30m
2026-04-15 N407SK - Apr 15, 21:05 UTCApr 15, 22:40 UTC1h 35m
2026-04-15 N407SK - Apr 15, 19:15 UTCApr 15, 21:00 UTC1h 45m
2026-04-15 N407SK - Apr 15, 17:05 UTCApr 15, 18:55 UTC1h 50m
2026-04-14 N407SK - Apr 14, 23:15 UTCApr 15, 00:20 UTC1h 5m
2026-04-14 N407SK - Apr 14, 21:55 UTCApr 14, 22:45 UTC50m
2026-04-14 N407SK - Apr 14, 20:55 UTCApr 14, 21:15 UTC20m
2026-04-14 N407SK - Apr 14, 19:00 UTCApr 14, 20:50 UTC1h 50m
2026-04-14 N407SK - Apr 14, 18:00 UTCApr 14, 18:45 UTC45m
2026-04-13 N407SK MCC → NOT Apr 13, 23:00 UTCApr 13, 23:40 UTC40m
2026-04-13 N407SK - Apr 13, 20:40 UTCApr 13, 22:05 UTC1h 25m
2026-04-13 N407SK - Apr 13, 19:35 UTCApr 13, 19:50 UTC15m
2026-04-13 N407SK - Apr 13, 16:55 UTCApr 13, 17:10 UTC15m

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 N407SK page for operator, model, and routing details .

Mode-S A4C83C frequently asked

What is Mode-S code A4C83C?
A4C83C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N407SK.
Where is Mode-S A4C83C registered?
Mode-S code A4C83C 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 A4C83C broadcasting right now?
No active broadcast right now. Last signal was 10d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C83C, octal 51144074, decimal 10,799,164.
What flights does A4C83C operate?
Mode-S A4C83C has broadcast 1 distinct callsign, including N407SK.