Apparatus

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sensors Mode-S transponder

A53C39

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4363R · CESSNA 172 Skyhawk · operated by SKY WALKER FLIGHT SCHOOL LLC

Hex
A53C39
Octal
51236071
Decimal
10,828,857
Country
US
Tail
N4363R
Type
C172
No current signal · last broadcast Jul 26, 14:35 UTC
Flights observed
156
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 14:35 UTC

Last known position

Most recent position reported by Mode-S A53C39.

Country allocation

The ICAO 24-bit address A53C39 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
N4363R - 155 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N4363R - Jul 26, 14:20 UTCJul 26, 14:35 UTC15m
2026-07-26 N4363R - Jul 26, 13:45 UTCJul 26, 14:10 UTC25m
2026-07-25 N4363R - Jul 25, 19:30 UTCJul 25, 20:00 UTC30m
2026-07-24 N4363R - Jul 24, 18:35 UTCJul 24, 19:00 UTC25m
2026-07-24 N4363R - Jul 24, 15:50 UTCJul 24, 16:30 UTC40m
2026-07-24 N4363R - Jul 24, 14:20 UTCJul 24, 14:35 UTC15m
2026-07-23 N4363R - Jul 23, 23:10 UTCJul 23, 23:25 UTC15m
2026-07-23 N4363R - Jul 23, 16:45 UTCJul 23, 17:10 UTC25m
2026-07-23 N4363R - Jul 23, 15:45 UTCJul 23, 16:35 UTC50m
2026-07-22 N4363R - Jul 22, 21:35 UTCJul 22, 22:00 UTC25m
2026-07-20 N4363R - Jul 20, 14:45 UTCJul 20, 15:25 UTC40m
2026-07-19 N4363R - Jul 19, 23:35 UTCJul 20, 00:40 UTC1h 5m
2026-07-19 N4363R - Jul 19, 14:50 UTCJul 19, 14:55 UTC5m
2026-07-19 N4363R - Jul 19, 12:55 UTCJul 19, 13:20 UTC25m
2026-07-18 N4363R - Jul 18, 13:05 UTCJul 18, 13:15 UTC10m
2026-07-18 N4363R - Jul 18, 12:45 UTCJul 18, 13:00 UTC15m
2026-07-15 N4363R - Jul 15, 13:40 UTCJul 15, 13:55 UTC15m
2026-07-15 N4363R - Jul 15, 13:25 UTCJul 15, 13:35 UTC10m
2026-07-13 N4363R - Jul 13, 19:30 UTCJul 13, 20:40 UTC1h 10m
2026-07-13 N4363R - Jul 13, 14:40 UTCJul 13, 15:30 UTC50m
2026-07-13 N4363R - Jul 13, 12:50 UTCJul 13, 13:30 UTC40m
2026-07-12 N4363R - Jul 12, 23:45 UTCJul 13, 00:25 UTC40m
2026-07-11 N4363R - Jul 11, 16:35 UTCJul 11, 17:15 UTC40m
2026-07-11 N4363R - Jul 11, 14:40 UTCJul 11, 15:30 UTC50m
2026-07-11 - - Jul 11, 13:20 UTCJul 11, 13:30 UTC10m
2026-07-08 N4363R - Jul 8, 23:30 UTCJul 9, 00:20 UTC50m
2026-07-08 N4363R - Jul 8, 21:20 UTCJul 8, 22:15 UTC55m
2026-07-08 N4363R - Jul 8, 13:55 UTCJul 8, 14:05 UTC10m
2026-07-08 N4363R - Jul 8, 13:35 UTCJul 8, 13:50 UTC15m
2026-07-07 N4363R - Jul 7, 19:50 UTCJul 7, 20:40 UTC50m
2026-07-07 N4363R - Jul 7, 18:05 UTCJul 7, 18:55 UTC50m
2026-07-07 N4363R - Jul 7, 17:50 UTCJul 7, 18:00 UTC10m
2026-07-07 N4363R - Jul 7, 15:55 UTCJul 7, 16:25 UTC30m
2026-07-07 N4363R - Jul 7, 12:30 UTCJul 7, 13:25 UTC55m
2026-07-07 N4363R PTK → ADG Jul 7, 01:25 UTCJul 7, 02:05 UTC40m
2026-07-06 N4363R - Jul 6, 20:35 UTCJul 6, 21:20 UTC45m
2026-07-01 N4363R - Jul 1, 14:35 UTCJul 1, 15:10 UTC35m
2026-07-01 N4363R - Jul 1, 14:20 UTCJul 1, 14:30 UTC10m
2026-06-30 N4363R - Jun 30, 13:25 UTCJun 30, 13:35 UTC10m
2026-06-30 N4363R - Jun 30, 12:45 UTCJun 30, 13:20 UTC35m
2026-06-29 N4363R - Jun 29, 18:10 UTCJun 29, 18:34 UTC25m
2026-06-27 N4363R - Jun 27, 16:30 UTCJun 27, 17:20 UTC50m
2026-06-27 N4363R - Jun 27, 14:45 UTCJun 27, 15:34 UTC50m
2026-06-27 N4363R - Jun 27, 12:39 UTCJun 27, 13:24 UTC45m
2026-06-26 N4363R - Jun 26, 20:44 UTCJun 26, 21:04 UTC20m
2026-06-26 N4363R - Jun 26, 16:39 UTCJun 26, 17:09 UTC30m
2026-06-26 N4363R - Jun 26, 14:29 UTCJun 26, 15:29 UTC1h 0m
2026-06-25 N4363R - Jun 25, 23:44 UTCJun 26, 00:30 UTC45m
2026-06-25 N4363R - Jun 25, 21:40 UTCJun 25, 22:20 UTC40m
2026-06-25 N4363R - Jun 25, 13:45 UTCJun 25, 14:59 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 N4363R page for operator, model, and routing details .

Mode-S A53C39 frequently asked

What is Mode-S code A53C39?
A53C39 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4363R.
Where is Mode-S A53C39 registered?
Mode-S code A53C39 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 A53C39 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53C39, octal 51236071, decimal 10,828,857.
What flights does A53C39 operate?
Mode-S A53C39 has broadcast 1 distinct callsign, including N4363R.