Apparatus

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sensors Mode-S transponder

A1DE16

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N21955 · CESSNA 208 Caravan · operated by PAH 6 INC

Hex
A1DE16
Octal
50357026
Decimal
10,608,150
Country
US
Tail
N21955
Type
C208
No current signal · last broadcast 2h ago
Flights observed
105
Distinct callsigns
1
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A1DE16.

Country allocation

The ICAO 24-bit address A1DE16 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
FTO219 Tropic Ocean Airways 105 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 FTO219 CXY → FLL May 30, 00:45 UTCMay 30, 01:10 UTC25m
2026-05-29 FTO219 CXY → FLL May 29, 23:30 UTCMay 30, 00:20 UTC50m
2026-05-29 FTO219 CXY → FLL May 29, 20:30 UTCMay 29, 20:50 UTC20m
2026-05-29 FTO219 CXY → FLL May 29, 19:00 UTCMay 29, 19:35 UTC35m
2026-05-29 FTO219 CXY → FLL May 29, 17:20 UTCMay 29, 18:20 UTC1h 0m
2026-05-29 FTO219 CXY → FLL May 29, 16:15 UTCMay 29, 16:25 UTC10m
2026-05-29 FTO219 CXY → FLL May 29, 14:00 UTCMay 29, 14:25 UTC25m
2026-05-29 FTO219 CXY → FLL May 29, 11:20 UTCMay 29, 11:45 UTC25m
2026-05-28 FTO219 CXY → FLL May 28, 16:00 UTCMay 28, 16:25 UTC25m
2026-05-28 FTO219 CXY → FLL May 28, 15:05 UTCMay 28, 15:20 UTC15m
2026-05-27 FTO219 CXY → FLL May 27, 19:45 UTCMay 27, 20:15 UTC30m
2026-05-27 FTO219 CXY → FLL May 27, 16:50 UTCMay 27, 17:15 UTC25m
2026-05-26 FTO219 CXY → FLL May 26, 22:44 UTCMay 26, 22:59 UTC15m
2026-05-26 FTO219 CXY → FLL May 26, 20:34 UTCMay 26, 20:54 UTC20m
2026-05-26 FTO219 CXY → FLL May 26, 19:30 UTCMay 26, 19:50 UTC20m
2026-05-26 FTO219 CXY → FLL May 26, 17:04 UTCMay 26, 17:20 UTC15m
2026-05-26 FTO219 CXY → FLL May 26, 15:24 UTCMay 26, 15:39 UTC15m
2026-05-26 FTO219 CXY → FLL May 26, 14:20 UTCMay 26, 14:35 UTC15m
2026-05-25 FTO219 CXY → FLL May 25, 23:10 UTCMay 25, 23:24 UTC15m
2026-05-25 FTO219 CXY → FLL May 25, 22:10 UTCMay 25, 22:30 UTC20m
2026-05-25 FTO219 CXY → FLL May 25, 20:55 UTCMay 25, 21:15 UTC20m
2026-05-25 FTO219 CXY → FLL May 25, 18:20 UTCMay 25, 18:45 UTC25m
2026-05-25 FTO219 CXY → FLL May 25, 17:20 UTCMay 25, 17:35 UTC15m
2026-05-25 FTO219 CXY → FLL May 25, 16:15 UTCMay 25, 16:35 UTC20m
2026-05-25 FTO219 CXY → FLL May 25, 15:05 UTCMay 25, 15:25 UTC20m
2026-05-25 FTO219 CXY → FLL May 25, 14:10 UTCMay 25, 14:25 UTC15m
2026-05-25 FTO219 CXY → FLL May 25, 13:10 UTCMay 25, 13:30 UTC20m
2026-05-25 FTO219 CXY → FLL May 25, 12:15 UTCMay 25, 12:35 UTC20m
2026-05-24 FTO219 CXY → FLL May 24, 21:40 UTCMay 24, 21:50 UTC10m
2026-05-24 FTO219 CXY → FLL May 24, 19:25 UTCMay 24, 19:45 UTC20m
2026-05-24 FTO219 CXY → FLL May 24, 18:15 UTCMay 24, 18:30 UTC15m
2026-05-24 FTO219 CXY → FLL May 24, 17:10 UTCMay 24, 17:25 UTC15m
2026-05-24 FTO219 CXY → FLL May 24, 14:05 UTCMay 24, 14:20 UTC15m
2026-05-24 FTO219 CXY → FLL May 24, 12:45 UTCMay 24, 12:55 UTC10m
2026-05-23 FTO219 CXY → FLL May 23, 19:00 UTCMay 23, 19:15 UTC15m
2026-05-23 FTO219 CXY → FLL May 23, 17:20 UTCMay 23, 17:45 UTC25m
2026-05-22 FTO219 CXY → FLL May 22, 21:10 UTCMay 22, 22:15 UTC1h 5m
2026-05-22 FTO219 CXY → FLL May 22, 19:00 UTCMay 22, 19:15 UTC15m
2026-05-22 FTO219 CXY → FLL May 22, 16:45 UTCMay 22, 17:10 UTC25m
2026-05-22 FTO219 CXY → FLL May 22, 15:05 UTCMay 22, 15:20 UTC15m
2026-05-22 FTO219 CXY → FLL May 22, 12:45 UTCMay 22, 13:10 UTC25m
2026-05-21 FTO219 CXY → FLL May 21, 16:10 UTCMay 21, 16:25 UTC15m
2026-05-21 FTO219 CXY → FLL May 21, 15:10 UTCMay 21, 15:30 UTC20m
2026-05-20 FTO219 CXY → FLL May 20, 19:40 UTCMay 20, 20:00 UTC20m
2026-05-20 FTO219 CXY → FLL May 20, 17:05 UTCMay 20, 17:35 UTC30m
2026-05-20 FTO219 CXY → FLL May 20, 15:10 UTCMay 20, 15:25 UTC15m
2026-05-20 FTO219 CXY → FLL May 20, 12:45 UTCMay 20, 13:10 UTC25m
2026-05-19 FTO219 CXY → FLL May 19, 21:45 UTCMay 19, 22:00 UTC15m
2026-05-19 FTO219 CXY → FLL May 19, 19:30 UTCMay 19, 20:00 UTC30m
2026-05-19 FTO219 CXY → FLL May 19, 18:20 UTCMay 19, 18:35 UTC15m

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 N21955 page for operator, model, and routing details .

Mode-S A1DE16 frequently asked

What is Mode-S code A1DE16?
A1DE16 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N21955.
Where is Mode-S A1DE16 registered?
Mode-S code A1DE16 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 A1DE16 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1DE16, octal 50357026, decimal 10,608,150.
What flights does A1DE16 operate?
Mode-S A1DE16 has broadcast 1 distinct callsign, including FTO219.