Apparatus

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sensors Mode-S transponder

A4F110

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4174L · ROBINSON R-44 Raven · operated by CST & SONS LLC

Hex
A4F110
Octal
51170420
Decimal
10,809,616
Country
US
Tail
N4174L
Type
R44
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
270
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S A4F110.

Country allocation

The ICAO 24-bit address A4F110 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
N4174L - 270 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N4174L - Jul 26, 19:15 UTCJul 26, 20:40 UTC1h 25m
2026-07-26 N4174L - Jul 26, 15:15 UTCJul 26, 17:25 UTC2h 10m
2026-07-26 N4174L - Jul 26, 03:00 UTCJul 26, 04:00 UTC1h 0m
2026-07-25 N4174L - Jul 25, 23:00 UTCJul 26, 00:25 UTC1h 25m
2026-07-25 N4174L - Jul 25, 21:20 UTCJul 25, 21:45 UTC25m
2026-07-25 N4174L - Jul 25, 18:30 UTCJul 25, 20:25 UTC1h 55m
2026-07-25 N4174L - Jul 25, 16:50 UTCJul 25, 17:50 UTC1h 0m
2026-07-25 N4174L - Jul 25, 01:15 UTCJul 25, 03:40 UTC2h 25m
2026-07-24 N4174L - Jul 24, 23:40 UTCJul 25, 00:20 UTC40m
2026-07-24 N4174L - Jul 24, 22:50 UTCJul 24, 23:00 UTC10m
2026-07-24 N4174L - Jul 24, 21:05 UTCJul 24, 22:05 UTC1h 0m
2026-07-21 N4174L - Jul 21, 21:20 UTCJul 21, 23:30 UTC2h 10m
2026-07-21 N4174L - Jul 21, 00:30 UTCJul 21, 01:40 UTC1h 10m
2026-07-20 N4174L - Jul 20, 22:25 UTCJul 20, 23:00 UTC35m
2026-07-20 N4174L - Jul 20, 01:25 UTCJul 20, 03:30 UTC2h 5m
2026-07-19 N4174L - Jul 19, 23:30 UTCJul 20, 00:30 UTC1h 0m
2026-07-19 N4174L - Jul 19, 22:45 UTCJul 19, 22:55 UTC10m
2026-07-19 N4174L - Jul 19, 21:05 UTCJul 19, 21:50 UTC45m
2026-07-18 N4174L - Jul 18, 23:25 UTCJul 19, 00:15 UTC50m
2026-07-17 N4174L - Jul 17, 23:45 UTCJul 18, 00:19 UTC35m
2026-07-17 N4174L - Jul 17, 20:40 UTCJul 17, 20:50 UTC10m
2026-07-17 N4174L - Jul 17, 18:55 UTCJul 17, 19:05 UTC10m
2026-07-17 N4174L - Jul 17, 17:15 UTCJul 17, 18:15 UTC1h 0m
2026-07-17 N4174L - Jul 17, 15:20 UTCJul 17, 15:29 UTC10m
2026-07-16 N4174L - Jul 16, 01:40 UTCJul 16, 03:35 UTC1h 55m
2026-07-15 N4174L - Jul 15, 23:45 UTCJul 16, 00:30 UTC45m
2026-07-15 N4174L - Jul 15, 21:55 UTCJul 15, 22:15 UTC20m
2026-07-15 N4174L - Jul 15, 01:10 UTCJul 15, 03:40 UTC2h 30m
2026-07-14 N4174L - Jul 14, 23:25 UTCJul 15, 00:20 UTC55m
2026-07-14 N4174L - Jul 14, 22:10 UTCJul 14, 22:25 UTC15m
2026-07-14 N4174L - Jul 14, 19:15 UTCJul 14, 19:25 UTC10m
2026-07-14 N4174L - Jul 14, 00:25 UTCJul 14, 04:50 UTC4h 25m
2026-07-13 N4174L - Jul 13, 22:55 UTCJul 13, 23:35 UTC40m
2026-07-13 N4174L - Jul 13, 22:00 UTCJul 13, 22:10 UTC10m
2026-07-13 N4174L - Jul 13, 19:00 UTCJul 13, 21:15 UTC2h 15m
2026-07-13 N4174L - Jul 13, 00:20 UTCJul 13, 03:45 UTC3h 25m
2026-07-12 N4174L - Jul 12, 17:20 UTCJul 12, 20:45 UTC3h 25m
2026-07-12 N4174L - Jul 12, 15:20 UTCJul 12, 16:30 UTC1h 10m
2026-07-11 N4174L - Jul 11, 23:10 UTCJul 12, 00:15 UTC1h 5m
2026-07-11 N4174L - Jul 11, 19:35 UTCJul 11, 21:45 UTC2h 10m
2026-07-11 N4174L - Jul 11, 15:20 UTCJul 11, 17:40 UTC2h 20m
2026-07-11 N4174L - Jul 11, 03:20 UTCJul 11, 03:40 UTC20m
2026-07-11 N4174L - Jul 11, 01:30 UTCJul 11, 01:55 UTC25m
2026-07-10 N4174L - Jul 10, 23:40 UTCJul 11, 00:45 UTC1h 5m
2026-07-10 N4174L - Jul 10, 22:10 UTCJul 10, 22:35 UTC25m
2026-07-10 N4174L - Jul 10, 18:45 UTCJul 10, 20:10 UTC1h 25m
2026-07-10 N4174L - Jul 10, 15:35 UTCJul 10, 18:05 UTC2h 30m
2026-07-10 N4174L - Jul 10, 01:05 UTCJul 10, 01:45 UTC40m
2026-07-09 N4174L - Jul 9, 23:30 UTCJul 10, 00:15 UTC45m
2026-07-09 N4174L - Jul 9, 22:05 UTCJul 9, 22:45 UTC40m

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 N4174L page for operator, model, and routing details .

Mode-S A4F110 frequently asked

What is Mode-S code A4F110?
A4F110 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4174L.
Where is Mode-S A4F110 registered?
Mode-S code A4F110 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 A4F110 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4F110, octal 51170420, decimal 10,809,616.
What flights does A4F110 operate?
Mode-S A4F110 has broadcast 1 distinct callsign, including N4174L.