Apparatus

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sensors Mode-S transponder

A63E21

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N501EX · CESSNA 208 Caravan · operated by FLOATSIX LEASING LLC

Hex
A63E21
Octal
51437041
Decimal
10,894,881
Country
US
Tail
N501EX
Type
C208
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
260
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A63E21.

Country allocation

The ICAO 24-bit address A63E21 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
FTO501 Tropic Ocean Airways 260 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FTO501 FLL → BCT Jul 26, 21:25 UTCJul 26, 22:00 UTC35m
2026-07-26 FTO501 FLL → BCT Jul 26, 20:15 UTCJul 26, 21:00 UTC45m
2026-07-26 FTO501 FLL → BCT Jul 26, 18:40 UTCJul 26, 19:15 UTC35m
2026-07-26 FTO501 FLL → BCT Jul 26, 17:30 UTCJul 26, 18:20 UTC50m
2026-07-26 FTO501 FLL → BCT Jul 26, 15:55 UTCJul 26, 16:30 UTC35m
2026-07-26 FTO501 FLL → BCT Jul 26, 14:45 UTCJul 26, 15:00 UTC15m
2026-07-26 FTO501 FLL → BCT Jul 26, 04:40 UTCJul 26, 07:30 UTC2h 51m
2026-07-26 FTO501 FLL → BCT Jul 26, 01:15 UTCJul 26, 03:50 UTC2h 35m
2026-07-25 FTO501 FLL → BCT Jul 25, 20:40 UTCJul 25, 22:55 UTC2h 15m
2026-07-25 FTO501 FLL → BCT Jul 25, 17:00 UTCJul 25, 17:30 UTC30m
2026-07-25 FTO501 FLL → BCT Jul 25, 15:05 UTCJul 25, 15:30 UTC25m
2026-07-24 FTO501 FLL → BCT Jul 24, 21:05 UTCJul 24, 21:15 UTC10m
2026-07-24 FTO501 FLL → BCT Jul 24, 18:40 UTCJul 24, 18:55 UTC15m
2026-07-24 FTO501 FLL → BCT Jul 24, 17:40 UTCJul 24, 17:55 UTC15m
2026-07-24 FTO501 FLL → BCT Jul 24, 16:05 UTCJul 24, 16:15 UTC10m
2026-07-24 FTO501 FLL → BCT Jul 24, 13:50 UTCJul 24, 14:10 UTC20m
2026-07-24 FTO501 FLL → BCT Jul 24, 12:45 UTCJul 24, 12:55 UTC10m
2026-07-23 FTO501 FLL → BCT Jul 23, 21:55 UTCJul 23, 22:15 UTC20m
2026-07-23 FTO501 FLL → BCT Jul 23, 19:50 UTCJul 23, 20:15 UTC25m
2026-07-23 FTO501 FLL → BCT Jul 23, 16:30 UTCJul 23, 16:45 UTC15m
2026-07-23 FTO501 FLL → BCT Jul 23, 15:25 UTCJul 23, 15:35 UTC10m
2026-07-23 FTO501 FLL → BCT Jul 23, 14:15 UTCJul 23, 14:35 UTC20m
2026-07-23 FTO501 FLL → BCT Jul 23, 11:50 UTCJul 23, 12:20 UTC30m
2026-07-13 FTO501 - Jul 13, 21:25 UTCJul 13, 21:35 UTC10m
2026-07-13 FTO501 - Jul 13, 18:35 UTCJul 13, 19:00 UTC25m
2026-07-13 FTO501 - Jul 13, 16:05 UTCJul 13, 16:30 UTC25m
2026-07-13 FTO501 - Jul 13, 15:00 UTCJul 13, 15:25 UTC25m
2026-07-13 FTO501 - Jul 13, 13:55 UTCJul 13, 14:05 UTC10m
2026-07-13 FTO501 - Jul 13, 12:50 UTCJul 13, 13:00 UTC10m
2026-07-12 FTO501 - Jul 12, 22:30 UTCJul 12, 22:45 UTC15m
2026-07-12 FTO501 - Jul 12, 20:25 UTCJul 12, 20:55 UTC30m
2026-07-12 FTO501 - Jul 12, 19:10 UTCJul 12, 19:30 UTC20m
2026-07-12 FTO501 - Jul 12, 16:20 UTCJul 12, 16:30 UTC10m
2026-07-12 FTO501 - Jul 12, 13:55 UTCJul 12, 14:05 UTC10m
2026-07-11 FTO501 - Jul 11, 21:05 UTCJul 11, 21:15 UTC10m
2026-07-11 FTO501 - Jul 11, 19:00 UTCJul 11, 19:10 UTC10m
2026-07-11 FTO501 - Jul 11, 17:40 UTCJul 11, 17:50 UTC10m
2026-07-11 FTO501 - Jul 11, 16:25 UTCJul 11, 16:35 UTC10m
2026-07-11 FTO501 - Jul 11, 13:50 UTCJul 11, 14:05 UTC15m
2026-07-11 FTO501 - Jul 11, 12:40 UTCJul 11, 12:55 UTC15m
2026-07-10 FTO501 - Jul 10, 21:05 UTCJul 10, 21:15 UTC10m
2026-07-10 FTO501 - Jul 10, 20:05 UTCJul 10, 20:15 UTC10m
2026-07-10 FTO501 - Jul 10, 19:05 UTCJul 10, 19:15 UTC10m
2026-07-10 FTO501 - Jul 10, 17:55 UTCJul 10, 18:05 UTC10m
2026-07-10 FTO501 - Jul 10, 16:25 UTCJul 10, 16:35 UTC10m
2026-07-10 FTO501 - Jul 10, 15:10 UTCJul 10, 15:20 UTC10m
2026-07-10 FTO501 - Jul 10, 13:55 UTCJul 10, 14:05 UTC10m
2026-07-10 FTO501 - Jul 10, 12:45 UTCJul 10, 13:00 UTC15m
2026-07-09 FTO501 FLL → BCT Jul 9, 16:25 UTCJul 9, 16:40 UTC15m
2026-07-08 FTO501 FLL → BCT Jul 8, 21:00 UTCJul 8, 21:10 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 N501EX page for operator, model, and routing details .

Mode-S A63E21 frequently asked

What is Mode-S code A63E21?
A63E21 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N501EX.
Where is Mode-S A63E21 registered?
Mode-S code A63E21 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 A63E21 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A63E21, octal 51437041, decimal 10,894,881.
What flights does A63E21 operate?
Mode-S A63E21 has broadcast 1 distinct callsign, including FTO501.