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sensors Mode-S transponder

A4E636

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4146R · PIPER PA-28-140/150/160/180 · operated by UNIVERSITY OF ILLINOIS, BOARD OF TRUSTEES

Hex
A4E636
Octal
51163066
Decimal
10,806,838
Country
US
Tail
N4146R
Type
P28A
No current signal · last broadcast 10h ago
Flights observed
129
Distinct callsigns
1
Country
US
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S A4E636.

Country allocation

The ICAO 24-bit address A4E636 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
ILU46R - 129 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 ILU46R CMI → CMI Jul 17, 22:00 UTCJul 17, 23:05 UTC1h 5m
2026-07-17 ILU46R - Jul 17, 11:45 UTCJul 17, 12:40 UTC55m
2026-07-16 ILU46R CMI → CMI Jul 16, 18:34 UTCJul 16, 19:20 UTC45m
2026-07-14 ILU46R CMI → CMI Jul 14, 22:45 UTCJul 14, 23:25 UTC40m
2026-07-14 ILU46R - Jul 14, 20:50 UTCJul 14, 21:15 UTC25m
2026-07-14 ILU46R - Jul 14, 18:25 UTCJul 14, 19:35 UTC1h 10m
2026-07-14 ILU46R CMI → CMI Jul 14, 15:40 UTCJul 14, 16:40 UTC1h 0m
2026-07-14 ILU46R CMI → CMI Jul 14, 13:40 UTCJul 14, 14:30 UTC50m
2026-07-13 ILU46R CMI → CMI Jul 13, 20:35 UTCJul 13, 21:30 UTC55m
2026-07-13 ILU46R CMI → CMI Jul 13, 18:40 UTCJul 13, 19:00 UTC20m
2026-07-13 ILU46R - Jul 13, 15:35 UTCJul 13, 16:45 UTC1h 10m
2026-07-10 ILU46R - Jul 10, 19:45 UTCJul 10, 20:20 UTC35m
2026-07-10 ILU46R - Jul 10, 18:15 UTCJul 10, 18:50 UTC35m
2026-07-10 ILU46R - Jul 10, 15:35 UTCJul 10, 16:20 UTC45m
2026-07-09 ILU46R CMI → CMI Jul 9, 20:35 UTCJul 9, 21:35 UTC1h 0m
2026-07-09 ILU46R - Jul 9, 17:50 UTCJul 9, 19:05 UTC1h 15m
2026-07-09 ILU46R - Jul 9, 14:45 UTCJul 9, 17:05 UTC2h 20m
2026-07-08 ILU46R - Jul 8, 23:20 UTCJul 9, 01:30 UTC2h 10m
2026-07-08 ILU46R - Jul 8, 19:40 UTCJul 8, 21:30 UTC1h 50m
2026-07-08 ILU46R - Jul 8, 15:00 UTCJul 8, 18:55 UTC3h 55m
2026-07-08 ILU46R - Jul 8, 14:05 UTCJul 8, 14:25 UTC20m
2026-07-07 ILU46R CMI → CMI Jul 7, 22:45 UTCJul 7, 23:50 UTC1h 5m
2026-07-07 ILU46R - Jul 7, 18:45 UTCJul 7, 20:05 UTC1h 20m
2026-07-07 ILU46R - Jul 7, 13:45 UTCJul 7, 14:55 UTC1h 10m
2026-07-06 ILU46R CMI → CMI Jul 6, 20:40 UTCJul 6, 21:00 UTC20m
2026-07-06 ILU46R - Jul 6, 18:45 UTCJul 6, 19:45 UTC1h 0m
2026-07-02 ILU46R - Jul 2, 13:50 UTCJul 2, 15:10 UTC1h 20m
2026-07-01 ILU46R CMI → CMI Jul 1, 15:10 UTCJul 1, 16:15 UTC1h 5m
2026-06-30 ILU46R - Jun 30, 15:45 UTCJun 30, 16:25 UTC40m
2026-06-30 ILU46R - Jun 30, 13:40 UTCJun 30, 14:50 UTC1h 10m
2026-06-29 ILU46R - Jun 29, 18:44 UTCJun 29, 19:49 UTC1h 5m
2026-06-29 ILU46R CMI → CMI Jun 29, 15:24 UTCJun 29, 16:15 UTC50m
2026-06-29 ILU46R CMI → CMI Jun 29, 13:34 UTCJun 29, 14:34 UTC1h 0m
2026-06-26 ILU46R - Jun 26, 16:00 UTCJun 26, 16:54 UTC55m
2026-06-26 ILU46R - Jun 26, 13:40 UTCJun 26, 14:39 UTC1h 0m
2026-06-25 ILU46R CMI → CMI Jun 25, 22:59 UTCJun 25, 23:55 UTC55m
2026-06-25 ILU46R - Jun 25, 18:39 UTCJun 25, 19:54 UTC1h 15m
2026-06-23 ILU46R - Jun 23, 13:45 UTCJun 23, 14:49 UTC1h 5m
2026-06-22 ILU46R - Jun 22, 23:29 UTCJun 23, 01:20 UTC1h 50m
2026-06-22 ILU46R - Jun 22, 21:00 UTCJun 22, 22:54 UTC1h 55m
2026-06-20 ILU46R - Jun 20, 21:44 UTCJun 20, 22:20 UTC35m
2026-06-20 ILU46R CMI → CMI Jun 20, 02:29 UTCJun 20, 02:54 UTC25m
2026-06-19 ILU46R - Jun 19, 22:49 UTCJun 20, 00:19 UTC1h 30m
2026-06-19 ILU46R PIA → CMI Jun 19, 19:39 UTCJun 19, 20:24 UTC45m
2026-06-19 ILU46R - Jun 19, 18:05 UTCJun 19, 18:30 UTC25m
2026-06-19 ILU46R - Jun 19, 16:25 UTCJun 19, 17:04 UTC40m
2026-06-19 ILU46R CMI → CMI Jun 19, 13:54 UTCJun 19, 14:44 UTC50m
2026-06-19 ILU46R - Jun 19, 00:55 UTCJun 19, 03:09 UTC2h 15m
2026-06-18 ILU46R CMI → CMI Jun 18, 22:45 UTCJun 18, 23:40 UTC55m
2026-06-18 ILU46R CMI → CMI Jun 18, 21:00 UTCJun 18, 21:45 UTC45m

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 N4146R page for operator, model, and routing details .

Mode-S A4E636 frequently asked

What is Mode-S code A4E636?
A4E636 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4146R.
Where is Mode-S A4E636 registered?
Mode-S code A4E636 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 A4E636 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4E636, octal 51163066, decimal 10,806,838.
What flights does A4E636 operate?
Mode-S A4E636 has broadcast 1 distinct callsign, including ILU46R.