Apparatus

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sensors Mode-S transponder

ADD59B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9904V · CESSNA 172 Skyhawk · operated by SKYKING AVIATION SERVICES LLC

Hex
ADD59B
Octal
53352633
Decimal
11,392,411
Country
US
Tail
N9904V
Type
C172
No current signal · last broadcast 37m ago
Flights observed
81
Distinct callsigns
1
Country
US
Last broadcast
37m ago

Last known position

Most recent position reported by Mode-S ADD59B.

Country allocation

The ICAO 24-bit address ADD59B 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
N9904V - 81 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-04 N9904V - Jun 4, 21:15 UTCJun 4, 22:35 UTC1h 20m
2026-06-04 N9904V - Jun 4, 19:40 UTCJun 4, 20:10 UTC30m
2026-06-04 N9904V - Jun 4, 19:15 UTCJun 4, 19:30 UTC15m
2026-06-04 N9904V - Jun 4, 18:50 UTCJun 4, 19:10 UTC20m
2026-06-04 N9904V - Jun 4, 16:50 UTCJun 4, 17:00 UTC10m
2026-06-03 N9904V - Jun 3, 18:45 UTCJun 3, 19:50 UTC1h 5m
2026-06-03 N9904V - Jun 3, 16:00 UTCJun 3, 17:05 UTC1h 5m
2026-06-02 N9904V - Jun 2, 00:50 UTCJun 2, 01:05 UTC15m
2026-06-01 N9904V SAC → SAC Jun 1, 20:45 UTCJun 1, 22:35 UTC1h 50m
2026-06-01 N9904V - Jun 1, 15:35 UTCJun 1, 15:55 UTC20m
2026-05-31 N9904V - May 31, 19:40 UTCMay 31, 20:40 UTC1h 0m
2026-05-31 N9904V - May 31, 16:35 UTCMay 31, 18:15 UTC1h 40m
2026-05-31 N9904V - May 31, 00:10 UTCMay 31, 01:11 UTC1h 1m
2026-05-30 N9904V - May 30, 21:15 UTCMay 30, 22:40 UTC1h 25m
2026-05-30 N9904V - May 30, 18:10 UTCMay 30, 19:05 UTC55m
2026-05-29 N9904V - May 29, 18:35 UTCMay 29, 19:50 UTC1h 15m
2026-05-29 N9904V - May 29, 16:40 UTCMay 29, 17:45 UTC1h 5m
2026-05-29 N9904V - May 29, 01:30 UTCMay 29, 02:15 UTC45m
2026-05-28 N9904V - May 28, 23:30 UTCMay 29, 00:30 UTC1h 0m
2026-05-27 N9904V - May 27, 21:35 UTCMay 27, 22:10 UTC35m
2026-05-27 N9904V - May 27, 18:50 UTCMay 27, 19:50 UTC1h 0m
2026-05-27 N9904V - May 27, 16:40 UTCMay 27, 17:40 UTC1h 0m
2026-05-26 N9904V - May 26, 22:09 UTCMay 26, 22:20 UTC10m
2026-05-26 N9904V - May 26, 20:24 UTCMay 26, 21:04 UTC40m
2026-05-26 N9904V - May 26, 16:59 UTCMay 26, 18:45 UTC1h 45m
2026-05-23 N9904V - May 23, 16:45 UTCMay 23, 18:10 UTC1h 25m
2026-05-22 N9904V - May 22, 18:40 UTCMay 22, 19:40 UTC1h 0m
2026-05-22 N9904V - May 22, 16:25 UTCMay 22, 17:40 UTC1h 15m
2026-05-21 N9904V - May 21, 22:25 UTCMay 21, 22:50 UTC25m
2026-05-21 N9904V - May 21, 16:55 UTCMay 21, 18:25 UTC1h 30m
2026-05-20 N9904V - May 20, 21:35 UTCMay 20, 22:55 UTC1h 20m
2026-05-20 N9904V - May 20, 18:40 UTCMay 20, 20:05 UTC1h 25m
2026-05-20 N9904V - May 20, 16:45 UTCMay 20, 17:20 UTC35m
2026-05-19 N9904V - May 19, 22:55 UTCMay 19, 23:15 UTC20m
2026-05-19 N9904V SAC → SAC May 19, 19:55 UTCMay 19, 21:45 UTC1h 50m
2026-05-19 N9904V - May 19, 14:45 UTCMay 19, 15:05 UTC20m
2026-05-16 N9904V - May 16, 21:10 UTCMay 16, 22:00 UTC50m
2026-05-16 N9904V - May 16, 00:45 UTCMay 16, 01:20 UTC35m
2026-05-15 N9904V - May 15, 22:25 UTCMay 15, 23:10 UTC45m
2026-05-15 N9904V - May 15, 18:40 UTCMay 15, 20:35 UTC1h 55m
2026-05-15 N9904V - May 15, 16:40 UTCMay 15, 17:30 UTC50m
2026-05-14 N9904V - May 14, 23:35 UTCMay 15, 00:40 UTC1h 5m
2026-05-14 N9904V - May 14, 20:15 UTCMay 14, 20:45 UTC30m
2026-05-14 N9904V - May 14, 16:20 UTCMay 14, 16:40 UTC20m
2026-05-13 N9904V - May 13, 22:20 UTCMay 13, 23:20 UTC1h 0m
2026-05-07 N9904V - May 7, 22:40 UTCMay 7, 23:39 UTC59m
2026-05-07 N9904V - May 7, 15:45 UTCMay 7, 16:25 UTC40m
2026-05-06 N9904V - May 6, 20:50 UTCMay 6, 22:35 UTC1h 45m
2026-05-06 N9904V - May 6, 16:40 UTCMay 6, 17:40 UTC59m
2026-05-05 N9904V - May 5, 16:40 UTCMay 5, 17:10 UTC30m

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 N9904V page for operator, model, and routing details .

Mode-S ADD59B frequently asked

What is Mode-S code ADD59B?
ADD59B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9904V.
Where is Mode-S ADD59B registered?
Mode-S code ADD59B 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 ADD59B broadcasting right now?
No active broadcast right now. Last signal was 37m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADD59B, octal 53352633, decimal 11,392,411.
What flights does ADD59B operate?
Mode-S ADD59B has broadcast 1 distinct callsign, including N9904V.