Apparatus

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sensors Mode-S transponder

AD5517

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N95821 · CESSNA 152 · operated by KENT STATE UNIVERSITY

Hex
AD5517
Octal
53252427
Decimal
11,359,511
Country
US
Tail
N95821
Type
C152
No current signal · last broadcast Jul 14, 13:45 UTC
Flights observed
106
Distinct callsigns
1
Country
US
Last broadcast
Jul 14, 13:45 UTC

Last known position

Most recent position reported by Mode-S AD5517.

Country allocation

The ICAO 24-bit address AD5517 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
KSF5 - 106 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KSF5 - Jul 14, 12:50 UTCJul 14, 13:45 UTC55m
2026-07-13 KSF5 - Jul 13, 17:30 UTCJul 13, 18:35 UTC1h 5m
2026-07-13 KSF5 - Jul 13, 15:55 UTCJul 13, 16:05 UTC10m
2026-07-13 KSF5 - Jul 13, 14:55 UTCJul 13, 15:20 UTC25m
2026-07-13 KSF5 - Jul 13, 12:50 UTCJul 13, 13:00 UTC10m
2026-07-09 KSF5 - Jul 9, 20:45 UTCJul 9, 21:55 UTC1h 10m
2026-07-09 KSF5 - Jul 9, 13:00 UTCJul 9, 13:50 UTC50m
2026-07-08 KSF5 - Jul 8, 21:45 UTCJul 8, 21:55 UTC10m
2026-07-08 KSF5 - Jul 8, 18:45 UTCJul 8, 19:55 UTC1h 10m
2026-07-07 KSF5 - Jul 7, 22:45 UTCJul 7, 23:15 UTC30m
2026-07-07 KSF5 - Jul 7, 19:30 UTCJul 7, 19:40 UTC10m
2026-07-07 KSF5 - Jul 7, 18:45 UTCJul 7, 18:55 UTC10m
2026-07-02 KSF5 - Jul 2, 12:45 UTCJul 2, 12:55 UTC10m
2026-06-30 KSF5 - Jun 30, 14:45 UTCJun 30, 15:30 UTC45m
2026-06-30 KSF5 - Jun 30, 12:55 UTCJun 30, 13:35 UTC40m
2026-06-29 KSF5 - Jun 29, 13:04 UTCJun 29, 13:49 UTC45m
2026-06-26 KSF5 - Jun 26, 22:29 UTCJun 26, 22:44 UTC15m
2026-06-26 KSF5 - Jun 26, 18:34 UTCJun 26, 19:04 UTC30m
2026-06-26 KSF5 - Jun 26, 16:39 UTCJun 26, 17:19 UTC40m
2026-06-26 KSF5 - Jun 26, 14:25 UTCJun 26, 14:59 UTC35m
2026-06-26 KSF5 - Jun 26, 12:29 UTCJun 26, 13:40 UTC1h 10m
2026-06-24 KSF5 - Jun 24, 22:49 UTCJun 25, 00:09 UTC1h 20m
2026-06-24 KSF5 - Jun 24, 14:45 UTCJun 24, 15:54 UTC1h 10m
2026-06-21 KSF5 - Jun 21, 13:44 UTCJun 21, 13:54 UTC10m
2026-06-21 KSF5 - Jun 21, 12:40 UTCJun 21, 12:55 UTC15m
2026-06-17 KSF5 - Jun 17, 13:25 UTCJun 17, 13:45 UTC20m
2026-06-17 KSF5 - Jun 17, 12:55 UTCJun 17, 13:20 UTC25m
2026-06-16 KSF5 - Jun 16, 12:55 UTCJun 16, 13:50 UTC55m
2026-06-16 KSF5 - Jun 16, 02:15 UTCJun 16, 03:25 UTC1h 10m
2026-06-15 KSF5 - Jun 15, 21:50 UTCJun 15, 22:40 UTC50m
2026-06-15 KSF5 - Jun 15, 18:20 UTCJun 15, 19:20 UTC1h 0m
2026-06-13 KSF5 - Jun 13, 18:35 UTCJun 13, 19:20 UTC45m
2026-06-11 KSF5 - Jun 11, 12:40 UTCJun 11, 13:35 UTC55m
2026-06-08 KSF5 - Jun 8, 12:55 UTCJun 8, 13:50 UTC55m
2026-06-04 KSF5 - Jun 4, 23:45 UTCJun 4, 23:55 UTC10m
2026-06-04 KSF5 - Jun 4, 22:35 UTCJun 4, 23:05 UTC30m
2026-06-04 KSF5 - Jun 4, 17:45 UTCJun 4, 18:05 UTC20m
2026-06-04 KSF5 - Jun 4, 15:35 UTCJun 4, 16:25 UTC50m
2026-06-04 KSF5 - Jun 4, 12:50 UTCJun 4, 13:45 UTC55m
2026-06-03 KSF5 - Jun 3, 23:40 UTCJun 4, 00:15 UTC35m
2026-06-03 KSF5 - Jun 3, 22:50 UTCJun 3, 23:05 UTC15m
2026-06-03 KSF5 - Jun 3, 15:35 UTCJun 3, 16:45 UTC1h 10m
2026-06-02 KSF5 - Jun 2, 15:25 UTCJun 2, 16:00 UTC35m
2026-05-28 KSF5 - May 28, 22:55 UTCMay 29, 00:25 UTC1h 30m
2026-05-28 KSF5 - May 28, 21:10 UTCMay 28, 21:50 UTC40m
2026-05-28 KSF5 - May 28, 15:40 UTCMay 28, 16:15 UTC35m
2026-05-28 KSF5 - May 28, 12:55 UTCMay 28, 13:40 UTC45m
2026-05-27 KSF5 - May 27, 22:50 UTCMay 28, 00:05 UTC1h 15m
2026-05-27 KSF5 - May 27, 20:30 UTCMay 27, 21:15 UTC45m
2026-05-27 KSF5 - May 27, 14:25 UTCMay 27, 15:25 UTC1h 0m

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 N95821 page for operator, model, and routing details .

Mode-S AD5517 frequently asked

What is Mode-S code AD5517?
AD5517 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N95821.
Where is Mode-S AD5517 registered?
Mode-S code AD5517 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 AD5517 broadcasting right now?
No active broadcast right now. Last signal was Jul 14, 13:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD5517, octal 53252427, decimal 11,359,511.
What flights does AD5517 operate?
Mode-S AD5517 has broadcast 1 distinct callsign, including KSF5.