Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A5DDEF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4773U · CESSNA T206 Turbo Stationair · operated by FINS FUR & FEATHERS FLYING LLC

Hex
A5DDEF
Octal
51356757
Decimal
10,870,255
Country
US
Tail
N4773U
Type
T206
No current signal · last broadcast 52m ago
Flights observed
219
Distinct callsigns
1
Country
US
Last broadcast
52m ago

Last known position

Most recent position reported by Mode-S A5DDEF.

Country allocation

The ICAO 24-bit address A5DDEF 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
N4773U - 219 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 N4773U - Jul 18, 15:15 UTCJul 18, 15:45 UTC30m
2026-07-18 N4773U - Jul 18, 00:00 UTCJul 18, 02:00 UTC2h 0m
2026-07-17 N4773U - Jul 17, 23:30 UTCJul 17, 23:55 UTC25m
2026-07-17 N4773U - Jul 17, 21:39 UTCJul 17, 22:20 UTC40m
2026-07-17 N4773U - Jul 17, 19:49 UTCJul 17, 20:00 UTC10m
2026-07-17 N4773U - Jul 17, 17:40 UTCJul 17, 19:05 UTC1h 25m
2026-07-17 N4773U - Jul 17, 16:49 UTCJul 17, 17:05 UTC15m
2026-07-17 N4773U - Jul 17, 15:15 UTCJul 17, 16:00 UTC45m
2026-07-16 N4773U - Jul 16, 22:15 UTCJul 17, 02:05 UTC3h 50m
2026-07-16 N4773U - Jul 16, 21:25 UTCJul 16, 21:40 UTC15m
2026-07-16 N4773U AKN → AKN Jul 16, 16:30 UTCJul 16, 17:35 UTC1h 5m
2026-07-16 N4773U - Jul 16, 02:35 UTCJul 16, 03:20 UTC45m
2026-07-16 N4773U - Jul 16, 00:20 UTCJul 16, 01:40 UTC1h 20m
2026-07-15 N4773U - Jul 15, 23:15 UTCJul 15, 23:30 UTC15m
2026-07-15 N4773U - Jul 15, 21:20 UTCJul 15, 22:15 UTC55m
2026-07-15 N4773U - Jul 15, 17:15 UTCJul 15, 19:30 UTC2h 15m
2026-07-15 N4773U - Jul 15, 16:20 UTCJul 15, 16:35 UTC15m
2026-07-15 N4773U - Jul 15, 15:10 UTCJul 15, 15:25 UTC15m
2026-07-14 N4773U - Jul 14, 22:55 UTCJul 14, 23:05 UTC10m
2026-07-14 N4773U - Jul 14, 21:25 UTCJul 14, 22:20 UTC55m
2026-07-14 N4773U - Jul 14, 16:00 UTCJul 14, 17:25 UTC1h 25m
2026-07-14 N4773U - Jul 14, 15:05 UTCJul 14, 15:25 UTC20m
2026-07-14 N4773U - Jul 14, 01:15 UTCJul 14, 01:50 UTC35m
2026-07-13 N4773U - Jul 13, 23:50 UTCJul 14, 00:35 UTC45m
2026-07-13 N4773U - Jul 13, 20:50 UTCJul 13, 23:10 UTC2h 20m
2026-07-13 N4773U - Jul 13, 15:55 UTCJul 13, 17:45 UTC1h 50m
2026-07-13 N4773U - Jul 13, 15:05 UTCJul 13, 15:20 UTC15m
2026-07-12 N4773U - Jul 12, 23:20 UTCJul 12, 23:55 UTC35m
2026-07-12 N4773U - Jul 12, 21:10 UTCJul 12, 21:25 UTC15m
2026-07-12 N4773U - Jul 12, 18:15 UTCJul 12, 19:05 UTC50m
2026-07-12 N4773U - Jul 12, 17:30 UTCJul 12, 17:45 UTC15m
2026-07-12 N4773U - Jul 12, 16:30 UTCJul 12, 16:40 UTC10m
2026-07-12 N4773U - Jul 12, 15:15 UTCJul 12, 15:55 UTC40m
2026-07-12 N4773U - Jul 12, 01:15 UTCJul 12, 02:45 UTC1h 30m
2026-07-11 N4773U - Jul 11, 23:25 UTCJul 11, 23:40 UTC15m
2026-07-11 N4773U - Jul 11, 01:15 UTCJul 11, 02:10 UTC55m
2026-07-11 N4773U - Jul 11, 00:20 UTCJul 11, 00:35 UTC15m
2026-07-10 N4773U - Jul 10, 22:15 UTCJul 10, 23:40 UTC1h 25m
2026-07-10 N4773U - Jul 10, 19:45 UTCJul 10, 19:55 UTC10m
2026-07-10 N4773U - Jul 10, 18:55 UTCJul 10, 19:05 UTC10m
2026-07-10 N4773U - Jul 10, 17:40 UTCJul 10, 18:50 UTC1h 10m
2026-07-10 N4773U - Jul 10, 03:30 UTCJul 10, 03:40 UTC10m
2026-07-09 N4773U - Jul 9, 23:30 UTCJul 10, 02:40 UTC3h 10m
2026-07-09 N4773U - Jul 9, 22:30 UTCJul 9, 22:50 UTC20m
2026-07-09 N4773U - Jul 9, 17:55 UTCJul 9, 20:00 UTC2h 5m
2026-07-09 N4773U - Jul 9, 00:35 UTCJul 9, 01:20 UTC45m
2026-07-08 N4773U - Jul 8, 22:35 UTCJul 8, 22:45 UTC10m
2026-07-08 N4773U AKN → BKF Jul 8, 21:00 UTCJul 8, 21:15 UTC15m
2026-07-08 N4773U - Jul 8, 18:00 UTCJul 8, 18:10 UTC10m
2026-07-08 N4773U - Jul 8, 17:10 UTCJul 8, 17:25 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 N4773U page for operator, model, and routing details .

Mode-S A5DDEF frequently asked

What is Mode-S code A5DDEF?
A5DDEF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4773U.
Where is Mode-S A5DDEF registered?
Mode-S code A5DDEF 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 A5DDEF broadcasting right now?
No active broadcast right now. Last signal was 52m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5DDEF, octal 51356757, decimal 10,870,255.
What flights does A5DDEF operate?
Mode-S A5DDEF has broadcast 1 distinct callsign, including N4773U.