Apparatus

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sensors Mode-S transponder

AD436A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9539L · CESSNA T182 Turbo Skylane · operated by ST PETE AVIATION SERVICES LLC

Hex
AD436A
Octal
53241552
Decimal
11,354,986
Country
US
Tail
N9539L
Type
C82S
No current signal · last broadcast 4h ago
Flights observed
88
Distinct callsigns
1
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S AD436A.

Country allocation

The ICAO 24-bit address AD436A 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
N9539L - 88 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N9539L - Jul 14, 12:40 UTCJul 14, 13:40 UTC1h 0m
2026-07-13 N9539L SPG → SPG Jul 13, 15:45 UTCJul 13, 16:50 UTC1h 5m
2026-07-12 N9539L - Jul 12, 20:35 UTCJul 12, 20:55 UTC20m
2026-07-09 N9539L - Jul 9, 16:15 UTCJul 9, 17:05 UTC50m
2026-07-08 N9539L - Jul 8, 16:45 UTCJul 8, 17:30 UTC45m
2026-07-08 N9539L - Jul 8, 14:20 UTCJul 8, 15:05 UTC45m
2026-07-03 N9539L - Jul 3, 16:25 UTCJul 3, 17:40 UTC1h 15m
2026-07-01 N9539L - Jul 1, 16:25 UTCJul 1, 17:00 UTC35m
2026-07-01 N9539L - Jul 1, 13:20 UTCJul 1, 14:55 UTC1h 35m
2026-07-01 N9539L - Jul 1, 10:45 UTCJul 1, 12:10 UTC1h 25m
2026-06-30 N9539L SPG → SPG Jun 30, 14:25 UTCJun 30, 14:55 UTC30m
2026-06-27 N9539L - Jun 27, 12:55 UTCJun 27, 14:09 UTC1h 15m
2026-06-26 N9539L - Jun 26, 20:55 UTCJun 26, 21:35 UTC40m
2026-06-26 N9539L - Jun 26, 16:35 UTCJun 26, 18:29 UTC1h 55m
2026-06-26 N9539L - Jun 26, 13:49 UTCJun 26, 15:34 UTC1h 45m
2026-06-25 N9539L - Jun 25, 14:14 UTCJun 25, 16:20 UTC2h 5m
2026-06-22 N9539L - Jun 22, 15:24 UTCJun 22, 16:05 UTC40m
2026-06-19 N9539L SPG → SPG Jun 19, 13:39 UTCJun 19, 15:54 UTC2h 15m
2026-06-18 N9539L - Jun 18, 22:45 UTCJun 18, 23:50 UTC1h 5m
2026-06-18 N9539L - Jun 18, 00:40 UTCJun 18, 01:25 UTC45m
2026-06-17 N9539L - Jun 17, 20:25 UTCJun 17, 21:05 UTC40m
2026-06-15 N9539L - Jun 15, 17:30 UTCJun 15, 20:30 UTC3h 0m
2026-06-14 N9539L - Jun 14, 14:40 UTCJun 14, 16:00 UTC1h 20m
2026-06-14 N9539L - Jun 14, 00:15 UTCJun 14, 00:55 UTC40m
2026-06-13 N9539L - Jun 13, 18:30 UTCJun 13, 18:45 UTC15m
2026-06-13 N9539L - Jun 13, 16:50 UTCJun 13, 17:45 UTC55m
2026-06-13 N9539L - Jun 13, 15:30 UTCJun 13, 15:50 UTC20m
2026-06-13 N9539L - Jun 13, 13:45 UTCJun 13, 14:05 UTC20m
2026-06-13 N9539L - Jun 13, 11:15 UTCJun 13, 11:30 UTC15m
2026-06-12 N9539L - Jun 12, 16:30 UTCJun 12, 19:05 UTC2h 35m
2026-06-12 N9539L - Jun 12, 14:20 UTCJun 12, 15:40 UTC1h 20m
2026-06-11 N9539L - Jun 11, 16:35 UTCJun 11, 20:20 UTC3h 45m
2026-06-11 N9539L - Jun 11, 14:30 UTCJun 11, 15:10 UTC40m
2026-06-11 N9539L - Jun 11, 13:10 UTCJun 11, 13:50 UTC40m
2026-06-10 N9539L - Jun 10, 13:40 UTCJun 10, 15:55 UTC2h 15m
2026-06-09 N9539L - Jun 9, 23:05 UTCJun 9, 23:35 UTC30m
2026-06-09 N9539L - Jun 9, 22:00 UTCJun 9, 22:30 UTC30m
2026-06-09 N9539L - Jun 9, 14:35 UTCJun 9, 14:45 UTC10m
2026-06-09 N9539L - Jun 9, 13:05 UTCJun 9, 14:05 UTC1h 0m
2026-06-08 N9539L - Jun 8, 00:30 UTCJun 8, 01:35 UTC1h 5m
2026-06-07 N9539L - Jun 7, 16:45 UTCJun 7, 18:00 UTC1h 15m
2026-06-07 N9539L - Jun 7, 11:45 UTCJun 7, 12:30 UTC45m
2026-06-06 N9539L - Jun 6, 18:35 UTCJun 6, 20:05 UTC1h 30m
2026-06-06 N9539L - Jun 6, 14:59 UTCJun 6, 16:50 UTC1h 50m
2026-06-05 N9539L - Jun 5, 20:15 UTCJun 5, 20:50 UTC35m
2026-06-05 N9539L - Jun 5, 13:30 UTCJun 5, 14:40 UTC1h 10m
2026-06-04 N9539L - Jun 4, 21:30 UTCJun 4, 22:00 UTC30m
2026-06-04 N9539L - Jun 4, 17:55 UTCJun 4, 18:30 UTC35m
2026-06-02 N9539L - Jun 2, 21:25 UTCJun 2, 23:35 UTC2h 10m
2026-06-02 N9539L - Jun 2, 19:15 UTCJun 2, 20:35 UTC1h 20m

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 N9539L page for operator, model, and routing details .

Mode-S AD436A frequently asked

What is Mode-S code AD436A?
AD436A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9539L.
Where is Mode-S AD436A registered?
Mode-S code AD436A 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 AD436A broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD436A, octal 53241552, decimal 11,354,986.
What flights does AD436A operate?
Mode-S AD436A has broadcast 1 distinct callsign, including N9539L.