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sensors Mode-S transponder

A4ED65

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4164Y · PIPER PA-28-140/150/160/180 · operated by BOARD OF TRUSTEES, UNIVERSITY OF ILLINOIS

Hex
A4ED65
Octal
51166545
Decimal
10,808,677
Country
US
Tail
N4164Y
Type
P28A
Broadcasting now · callsign ILU64Y · 1,300 ft
Flights observed
146
Distinct callsigns
1
Country
US
Last broadcast
7d ago

Current position

A4ED65 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4ED65 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
ILU64Y - 146 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 ILU64Y - Jul 23, 21:00 UTCJul 23, 21:50 UTC50m
2026-07-23 ILU64Y CMI → CMI Jul 23, 18:45 UTCJul 23, 19:40 UTC55m
2026-07-23 ILU64Y - Jul 23, 16:10 UTCJul 23, 17:05 UTC55m
2026-07-23 ILU64Y - Jul 23, 14:45 UTCJul 23, 15:20 UTC35m
2026-07-23 ILU64Y - Jul 23, 11:35 UTCJul 23, 13:00 UTC1h 25m
2026-07-22 ILU64Y CMI → CMI Jul 22, 21:20 UTCJul 22, 22:55 UTC1h 35m
2026-07-22 ILU64Y CMI → CMI Jul 22, 18:40 UTCJul 22, 20:00 UTC1h 20m
2026-07-22 ILU64Y CMI → CMI Jul 22, 13:45 UTCJul 22, 14:35 UTC50m
2026-07-21 ILU64Y - Jul 21, 20:15 UTCJul 21, 20:30 UTC15m
2026-07-21 ILU64Y - Jul 21, 18:00 UTCJul 21, 19:15 UTC1h 15m
2026-07-21 ILU64Y - Jul 21, 13:50 UTCJul 21, 14:40 UTC50m
2026-07-21 ILU64Y CMI → CMI Jul 21, 12:35 UTCJul 21, 13:05 UTC30m
2026-07-20 ILU64Y CMI → CMI Jul 20, 19:55 UTCJul 20, 21:00 UTC1h 5m
2026-07-20 ILU64Y CMI → CMI Jul 20, 16:25 UTCJul 20, 16:45 UTC20m
2026-07-20 ILU64Y CMI → CMI Jul 20, 14:45 UTCJul 20, 15:30 UTC45m
2026-07-20 ILU64Y CMI → CMI Jul 20, 11:30 UTCJul 20, 13:20 UTC1h 50m
2026-07-19 ILU64Y CMI → CMI Jul 19, 20:45 UTCJul 19, 21:25 UTC40m
2026-07-18 ILU64Y - Jul 18, 15:05 UTCJul 18, 16:05 UTC1h 0m
2026-07-17 ILU64Y - Jul 17, 15:44 UTCJul 17, 16:10 UTC25m
2026-07-17 ILU64Y - Jul 17, 13:50 UTCJul 17, 14:55 UTC1h 5m
2026-07-16 ILU64Y - Jul 16, 16:00 UTCJul 16, 16:19 UTC20m
2026-07-16 ILU64Y - Jul 16, 14:50 UTCJul 16, 15:25 UTC35m
2026-07-16 ILU64Y - Jul 16, 13:25 UTCJul 16, 14:05 UTC40m
2026-07-16 ILU64Y CMI → CMI Jul 16, 02:20 UTCJul 16, 03:00 UTC40m
2026-07-15 ILU64Y CMI → CMI Jul 15, 19:25 UTCJul 15, 19:55 UTC30m
2026-07-15 ILU64Y CMI → CMI Jul 15, 17:35 UTCJul 15, 17:50 UTC15m
2026-07-15 ILU64Y - Jul 15, 15:20 UTCJul 15, 16:30 UTC1h 10m
2026-07-15 ILU64Y CMI → CMI Jul 15, 12:30 UTCJul 15, 13:50 UTC1h 20m
2026-07-14 ILU64Y - Jul 14, 21:45 UTCJul 15, 01:10 UTC3h 24m
2026-07-14 ILU64Y - Jul 14, 18:10 UTCJul 14, 21:05 UTC2h 55m
2026-07-14 ILU64Y - Jul 14, 15:35 UTCJul 14, 16:35 UTC1h 0m
2026-07-14 ILU64Y - Jul 14, 13:35 UTCJul 14, 14:40 UTC1h 5m
2026-07-13 ILU64Y - Jul 13, 19:00 UTCJul 13, 20:30 UTC1h 30m
2026-07-13 ILU64Y - Jul 13, 15:30 UTCJul 13, 16:30 UTC1h 0m
2026-07-13 ILU64Y - Jul 13, 13:25 UTCJul 13, 14:35 UTC1h 10m
2026-07-12 ILU64Y - Jul 12, 18:25 UTCJul 12, 19:30 UTC1h 5m
2026-07-12 ILU64Y - Jul 12, 14:15 UTCJul 12, 15:25 UTC1h 10m
2026-07-10 ILU64Y CMI → CMI Jul 10, 18:20 UTCJul 10, 19:25 UTC1h 5m
2026-07-09 ILU64Y CMI → CMI Jul 9, 18:25 UTCJul 9, 19:10 UTC45m
2026-07-09 ILU64Y CMI → CMI Jul 9, 15:05 UTCJul 9, 16:05 UTC1h 0m
2026-07-09 ILU64Y CMI → CMI Jul 9, 14:20 UTCJul 9, 14:35 UTC15m
2026-07-09 ILU64Y CMI → CMI Jul 9, 04:00 UTCJul 9, 04:40 UTC40m
2026-07-08 ILU64Y CMI → CMI Jul 8, 22:50 UTCJul 8, 23:05 UTC15m
2026-07-08 ILU64Y - Jul 8, 20:45 UTCJul 8, 22:00 UTC1h 15m
2026-07-08 ILU64Y - Jul 8, 18:40 UTCJul 8, 19:20 UTC40m
2026-07-08 ILU64Y - Jul 8, 13:45 UTCJul 8, 17:25 UTC3h 40m
2026-07-08 ILU64Y - Jul 8, 02:20 UTCJul 8, 03:00 UTC40m
2026-07-07 ILU64Y CMI → CMI Jul 7, 21:50 UTCJul 7, 22:00 UTC10m
2026-07-07 ILU64Y - Jul 7, 17:25 UTCJul 7, 17:45 UTC20m
2026-07-07 ILU64Y CMI → CMI Jul 7, 15:35 UTCJul 7, 16:05 UTC30m

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 N4164Y page for operator, model, and routing details .

Mode-S A4ED65 frequently asked

What is Mode-S code A4ED65?
A4ED65 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4164Y.
Where is Mode-S A4ED65 registered?
Mode-S code A4ED65 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 A4ED65 broadcasting right now?
Yes. Mode-S A4ED65 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4ED65, octal 51166545, decimal 10,808,677.
What flights does A4ED65 operate?
Mode-S A4ED65 has broadcast 1 distinct callsign, including ILU64Y.