Apparatus

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sensors Mode-S transponder

A6D2CE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N539KS · CESSNA 172 Skyhawk · operated by KENT STATE UNIVERSITY

Hex
A6D2CE
Octal
51551316
Decimal
10,932,942
Country
US
Tail
N539KS
Type
C172
No current signal · last broadcast 11h ago
Flights observed
149
Distinct callsigns
1
Country
US
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S A6D2CE.

Country allocation

The ICAO 24-bit address A6D2CE 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
KSF39 - 149 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 KSF39 - Jul 13, 19:35 UTCJul 13, 20:35 UTC1h 0m
2026-07-13 KSF39 - Jul 13, 17:25 UTCJul 13, 18:25 UTC1h 0m
2026-07-13 KSF39 - Jul 13, 12:35 UTCJul 13, 16:25 UTC3h 50m
2026-07-13 KSF39 - Jul 13, 02:15 UTCJul 13, 04:50 UTC2h 35m
2026-07-12 KSF39 - Jul 12, 14:30 UTCJul 12, 15:40 UTC1h 10m
2026-07-10 KSF39 - Jul 10, 16:05 UTCJul 10, 16:35 UTC30m
2026-07-10 KSF39 - Jul 10, 14:25 UTCJul 10, 15:30 UTC1h 5m
2026-07-09 KSF39 - Jul 9, 22:10 UTCJul 9, 22:55 UTC45m
2026-07-07 KSF39 - Jul 7, 20:15 UTCJul 7, 20:55 UTC40m
2026-07-03 KSF39 - Jul 3, 02:00 UTCJul 3, 02:45 UTC45m
2026-07-02 KSF39 - Jul 2, 20:35 UTCJul 2, 21:45 UTC1h 10m
2026-07-02 KSF39 - Jul 2, 14:50 UTCJul 2, 15:15 UTC25m
2026-07-02 KSF39 - Jul 2, 12:25 UTCJul 2, 12:45 UTC20m
2026-07-02 KSF39 - Jul 2, 01:55 UTCJul 2, 04:20 UTC2h 25m
2026-07-01 KSF39 - Jul 1, 17:40 UTCJul 1, 18:10 UTC30m
2026-07-01 KSF39 - Jul 1, 14:15 UTCJul 1, 15:00 UTC45m
2026-07-01 KSF39 - Jul 1, 02:05 UTCJul 1, 02:55 UTC50m
2026-06-30 KSF39 - Jun 30, 17:20 UTCJun 30, 18:20 UTC1h 0m
2026-06-30 KSF39 - Jun 30, 11:25 UTCJun 30, 12:15 UTC50m
2026-06-30 KSF39 - Jun 30, 02:00 UTCJun 30, 04:20 UTC2h 20m
2026-06-29 KSF39 - Jun 29, 15:14 UTCJun 29, 16:15 UTC1h 0m
2026-06-28 KSF39 - Jun 28, 18:59 UTCJun 28, 19:55 UTC55m
2026-06-27 KSF39 - Jun 27, 18:24 UTCJun 27, 20:39 UTC2h 15m
2026-06-27 KSF39 - Jun 27, 14:45 UTCJun 27, 15:45 UTC1h 0m
2026-06-26 KSF39 - Jun 26, 21:30 UTCJun 26, 22:19 UTC50m
2026-06-26 KSF39 - Jun 26, 19:39 UTCJun 26, 20:29 UTC50m
2026-06-26 KSF39 - Jun 26, 15:39 UTCJun 26, 16:35 UTC55m
2026-06-25 KSF39 - Jun 25, 19:39 UTCJun 25, 20:19 UTC40m
2026-06-24 KSF39 - Jun 24, 23:34 UTCJun 25, 00:29 UTC55m
2026-06-24 KSF39 - Jun 24, 21:24 UTCJun 24, 22:19 UTC55m
2026-06-24 KSF39 - Jun 24, 19:44 UTCJun 24, 20:24 UTC40m
2026-06-24 KSF39 - Jun 24, 17:59 UTCJun 24, 18:55 UTC55m
2026-06-24 KSF39 - Jun 24, 15:39 UTCJun 24, 16:34 UTC55m
2026-06-24 KSF39 - Jun 24, 02:00 UTCJun 24, 04:05 UTC2h 5m
2026-06-23 KSF39 - Jun 23, 20:04 UTCJun 23, 21:14 UTC1h 10m
2026-06-23 KSF39 - Jun 23, 16:09 UTCJun 23, 17:25 UTC1h 15m
2026-06-21 KSF39 - Jun 21, 23:05 UTCJun 22, 00:40 UTC1h 35m
2026-06-21 KSF39 - Jun 21, 20:45 UTCJun 21, 22:24 UTC1h 40m
2026-06-21 KSF39 - Jun 21, 12:19 UTCJun 21, 15:09 UTC2h 50m
2026-06-20 KSF39 - Jun 20, 11:49 UTCJun 20, 14:24 UTC2h 35m
2026-06-17 KSF39 - Jun 17, 16:25 UTCJun 17, 17:35 UTC1h 10m
2026-06-17 KSF39 - Jun 17, 14:35 UTCJun 17, 15:25 UTC50m
2026-06-16 KSF39 - Jun 16, 18:15 UTCJun 16, 19:15 UTC1h 0m
2026-06-16 KSF39 - Jun 16, 15:00 UTCJun 16, 16:20 UTC1h 20m
2026-06-16 KSF39 - Jun 16, 11:45 UTCJun 16, 13:40 UTC1h 55m
2026-06-15 KSF39 - Jun 15, 22:45 UTCJun 15, 23:19 UTC35m
2026-06-15 KSF39 - Jun 15, 20:50 UTCJun 15, 21:20 UTC30m
2026-06-15 KSF39 - Jun 15, 17:54 UTCJun 15, 18:29 UTC35m
2026-06-15 KSF39 - Jun 15, 14:00 UTCJun 15, 15:50 UTC1h 50m
2026-06-08 KSF39 - Jun 8, 16:50 UTCJun 8, 17:00 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 N539KS page for operator, model, and routing details .

Mode-S A6D2CE frequently asked

What is Mode-S code A6D2CE?
A6D2CE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N539KS.
Where is Mode-S A6D2CE registered?
Mode-S code A6D2CE 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 A6D2CE broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6D2CE, octal 51551316, decimal 10,932,942.
What flights does A6D2CE operate?
Mode-S A6D2CE has broadcast 1 distinct callsign, including KSF39.