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sensors Mode-S transponder

A0F419

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1600U · CESSNA 172 Skyhawk · operated by OSPREY HOLDING COMPANY LLC

Hex
A0F419
Octal
50172031
Decimal
10,548,249
Country
US
Tail
N1600U
Type
C172
No current signal · last broadcast Jul 24, 21:35 UTC
Flights observed
140
Distinct callsigns
1
Country
US
Last broadcast
Jul 24, 21:35 UTC

Last known position

Most recent position reported by Mode-S A0F419.

Country allocation

The ICAO 24-bit address A0F419 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
N1600U - 140 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N1600U - Jul 24, 20:50 UTCJul 24, 21:35 UTC45m
2026-07-24 N1600U - Jul 24, 18:45 UTCJul 24, 19:30 UTC45m
2026-07-24 N1600U - Jul 24, 15:40 UTCJul 24, 17:10 UTC1h 30m
2026-07-24 N1600U - Jul 24, 13:35 UTCJul 24, 14:40 UTC1h 5m
2026-07-23 N1600U - Jul 23, 22:20 UTCJul 23, 23:40 UTC1h 20m
2026-07-23 N1600U - Jul 23, 21:15 UTCJul 23, 21:30 UTC15m
2026-07-23 N1600U - Jul 23, 20:30 UTCJul 23, 20:45 UTC15m
2026-07-23 N1600U - Jul 23, 18:30 UTCJul 23, 19:45 UTC1h 15m
2026-07-23 N1600U - Jul 23, 16:20 UTCJul 23, 16:50 UTC30m
2026-07-23 N1600U - Jul 23, 14:15 UTCJul 23, 14:45 UTC30m
2026-07-20 N1600U - Jul 20, 19:55 UTCJul 20, 20:15 UTC20m
2026-07-20 N1600U - Jul 20, 15:50 UTCJul 20, 16:15 UTC25m
2026-07-20 N1600U - Jul 20, 14:15 UTCJul 20, 14:50 UTC35m
2026-07-19 N1600U - Jul 19, 23:45 UTCJul 20, 00:35 UTC50m
2026-07-19 N1600U - Jul 19, 15:25 UTCJul 19, 15:50 UTC25m
2026-07-19 N1600U - Jul 19, 14:30 UTCJul 19, 14:50 UTC20m
2026-07-18 N1600U - Jul 18, 13:50 UTCJul 18, 14:05 UTC15m
2026-07-17 N1600U - Jul 17, 15:40 UTCJul 17, 16:29 UTC50m
2026-07-16 N1600U - Jul 16, 22:49 UTCJul 16, 23:05 UTC15m
2026-07-16 N1600U - Jul 16, 18:55 UTCJul 16, 19:10 UTC15m
2026-07-16 N1600U - Jul 16, 17:20 UTCJul 16, 18:05 UTC45m
2026-07-16 N1600U - Jul 16, 13:40 UTCJul 16, 14:45 UTC1h 5m
2026-07-15 N1600U - Jul 15, 21:50 UTCJul 15, 22:00 UTC10m
2026-07-15 N1600U - Jul 15, 20:30 UTCJul 15, 20:45 UTC15m
2026-07-15 N1600U - Jul 15, 18:50 UTCJul 15, 19:35 UTC45m
2026-07-15 N1600U - Jul 15, 16:10 UTCJul 15, 16:50 UTC40m
2026-07-15 N1600U - Jul 15, 13:40 UTCJul 15, 14:30 UTC50m
2026-07-14 N1600U - Jul 14, 15:55 UTCJul 14, 16:50 UTC55m
2026-07-13 N1600U - Jul 13, 17:55 UTCJul 13, 18:55 UTC1h 0m
2026-07-13 N1600U - Jul 13, 13:45 UTCJul 13, 16:15 UTC2h 30m
2026-07-10 N1600U - Jul 10, 18:45 UTCJul 10, 19:40 UTC55m
2026-07-10 N1600U - Jul 10, 15:30 UTCJul 10, 16:25 UTC55m
2026-07-10 N1600U - Jul 10, 14:15 UTCJul 10, 14:50 UTC35m
2026-07-09 N1600U - Jul 9, 21:20 UTCJul 9, 21:40 UTC20m
2026-07-09 N1600U - Jul 9, 20:25 UTCJul 9, 20:45 UTC20m
2026-07-09 N1600U - Jul 9, 18:30 UTCJul 9, 19:20 UTC50m
2026-07-09 N1600U - Jul 9, 15:55 UTCJul 9, 16:55 UTC1h 0m
2026-07-09 N1600U - Jul 9, 13:30 UTCJul 9, 14:40 UTC1h 10m
2026-07-09 N1600U - Jul 9, 01:50 UTCJul 9, 03:15 UTC1h 25m
2026-07-08 N1600U - Jul 8, 21:00 UTCJul 8, 21:50 UTC50m
2026-07-08 N1600U - Jul 8, 16:45 UTCJul 8, 17:00 UTC15m
2026-07-08 N1600U - Jul 8, 15:40 UTCJul 8, 15:55 UTC15m
2026-07-08 N1600U - Jul 8, 13:45 UTCJul 8, 14:45 UTC1h 0m
2026-06-30 N1600U - Jun 30, 13:55 UTCJun 30, 14:40 UTC45m
2026-06-29 N1600U - Jun 29, 15:39 UTCJun 29, 16:15 UTC35m
2026-06-29 N1600U - Jun 29, 14:09 UTCJun 29, 14:29 UTC20m
2026-06-28 N1600U - Jun 28, 20:34 UTCJun 28, 21:30 UTC55m
2026-06-27 N1600U - Jun 27, 13:49 UTCJun 27, 14:54 UTC1h 5m
2026-06-26 N1600U - Jun 26, 21:35 UTCJun 26, 21:45 UTC10m
2026-06-26 N1600U - Jun 26, 15:20 UTCJun 26, 16:20 UTC1h 0m

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 N1600U page for operator, model, and routing details .

Mode-S A0F419 frequently asked

What is Mode-S code A0F419?
A0F419 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1600U.
Where is Mode-S A0F419 registered?
Mode-S code A0F419 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 A0F419 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0F419, octal 50172031, decimal 10,548,249.
What flights does A0F419 operate?
Mode-S A0F419 has broadcast 1 distinct callsign, including N1600U.