Apparatus

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sensors Mode-S transponder

A6BB18

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N5326U · PIPER PA-28R-180/200/201 · operated by UNIVERSITY OF ILLINOIS, BOARD OF TRUSTEES

Hex
A6BB18
Octal
51535430
Decimal
10,926,872
Country
US
Tail
N5326U
Type
P28R
Broadcasting now · callsign ILU26U · 5,800 ft
Flights observed
134
Distinct callsigns
1
Country
US
Last broadcast
11h ago

Current position

A6BB18 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A6BB18 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
ILU26U - 134 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ILU26U - Jul 13, 22:30 UTCJul 14, 00:20 UTC1h 50m
2026-07-13 ILU26U - Jul 13, 20:25 UTCJul 13, 21:45 UTC1h 20m
2026-07-13 ILU26U - Jul 13, 18:30 UTCJul 13, 19:45 UTC1h 15m
2026-07-13 ILU26U - Jul 13, 15:20 UTCJul 13, 16:05 UTC45m
2026-07-13 ILU26U - Jul 13, 13:05 UTCJul 13, 13:55 UTC50m
2026-07-12 ILU26U CMI → CMI Jul 12, 20:35 UTCJul 12, 21:10 UTC35m
2026-07-12 ILU26U - Jul 12, 17:05 UTCJul 12, 19:05 UTC2h 0m
2026-07-12 ILU26U CMI → CMI Jul 12, 02:20 UTCJul 12, 04:10 UTC1h 50m
2026-07-10 ILU26U - Jul 10, 20:25 UTCJul 10, 20:55 UTC30m
2026-07-10 ILU26U - Jul 10, 18:25 UTCJul 10, 19:25 UTC1h 0m
2026-07-10 ILU26U CMI → CMI Jul 10, 17:05 UTCJul 10, 17:50 UTC45m
2026-07-10 ILU26U - Jul 10, 13:45 UTCJul 10, 14:50 UTC1h 5m
2026-07-09 ILU26U - Jul 9, 20:15 UTCJul 9, 21:25 UTC1h 10m
2026-07-08 ILU26U - Jul 8, 22:25 UTCJul 8, 23:20 UTC55m
2026-07-08 ILU26U - Jul 8, 20:40 UTCJul 8, 21:45 UTC1h 5m
2026-07-08 ILU26U - Jul 8, 17:25 UTCJul 8, 18:05 UTC40m
2026-07-08 ILU26U - Jul 8, 15:50 UTCJul 8, 16:50 UTC1h 0m
2026-07-08 ILU26U CMI → CMI Jul 8, 14:35 UTCJul 8, 15:00 UTC25m
2026-07-08 ILU26U - Jul 8, 11:55 UTCJul 8, 14:00 UTC2h 5m
2026-07-07 ILU26U CMI → CMI Jul 7, 22:45 UTCJul 7, 23:45 UTC1h 0m
2026-07-07 ILU26U CMI → CMI Jul 7, 20:20 UTCJul 7, 21:40 UTC1h 20m
2026-07-07 ILU26U - Jul 7, 15:35 UTCJul 7, 16:40 UTC1h 5m
2026-07-07 ILU26U CMI → CMI Jul 7, 13:15 UTCJul 7, 14:15 UTC1h 0m
2026-07-06 ILU26U - Jul 6, 22:15 UTCJul 6, 22:30 UTC15m
2026-07-06 ILU26U - Jul 6, 20:35 UTCJul 6, 21:35 UTC1h 0m
2026-07-04 ILU26U - Jul 4, 13:30 UTCJul 4, 14:55 UTC1h 25m
2026-07-03 ILU26U - Jul 3, 17:35 UTCJul 3, 18:25 UTC50m
2026-07-03 ILU26U - Jul 3, 13:25 UTCJul 3, 14:15 UTC50m
2026-07-03 ILU26U CMI → CMI Jul 3, 11:35 UTCJul 3, 12:40 UTC1h 5m
2026-07-02 ILU26U CMI → CMI Jul 2, 22:15 UTCJul 2, 23:00 UTC45m
2026-07-02 ILU26U CMI → CMI Jul 2, 15:35 UTCJul 2, 16:55 UTC1h 20m
2026-07-02 ILU26U - Jul 2, 13:45 UTCJul 2, 14:55 UTC1h 10m
2026-07-02 ILU26U CMI → CMI Jul 2, 11:40 UTCJul 2, 12:50 UTC1h 10m
2026-07-02 ILU26U - Jul 2, 00:10 UTCJul 2, 01:10 UTC1h 0m
2026-07-01 ILU26U - Jul 1, 19:30 UTCJul 1, 20:30 UTC1h 0m
2026-07-01 ILU26U - Jul 1, 15:20 UTCJul 1, 16:20 UTC1h 0m
2026-07-01 ILU26U - Jul 1, 11:45 UTCJul 1, 13:00 UTC1h 15m
2026-06-30 ILU26U - Jun 30, 19:55 UTCJun 30, 20:50 UTC55m
2026-06-30 ILU26U CMI → CMI Jun 30, 15:30 UTCJun 30, 16:50 UTC1h 20m
2026-06-30 ILU26U CMI → CMI Jun 30, 14:10 UTCJun 30, 14:50 UTC40m
2026-06-30 ILU26U CMI → CMI Jun 30, 12:55 UTCJun 30, 13:35 UTC40m
2026-06-30 ILU26U - Jun 30, 00:30 UTCJun 30, 01:14 UTC45m
2026-06-29 ILU26U - Jun 29, 22:24 UTCJun 29, 23:25 UTC1h 0m
2026-06-29 ILU26U CMI → CMI Jun 29, 18:39 UTCJun 29, 19:35 UTC55m
2026-06-28 ILU26U - Jun 28, 21:30 UTCJun 28, 22:59 UTC1h 30m
2026-06-26 ILU26U CMI → CMI Jun 26, 15:20 UTCJun 26, 16:09 UTC50m
2026-06-26 ILU26U - Jun 26, 13:24 UTCJun 26, 14:25 UTC1h 0m
2026-06-25 ILU26U - Jun 25, 19:49 UTCJun 25, 20:54 UTC1h 5m
2026-06-24 ILU26U CMI → CMI Jun 24, 18:34 UTCJun 24, 19:20 UTC45m
2026-06-24 ILU26U CMI → CMI Jun 24, 15:49 UTCJun 24, 16:29 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 N5326U page for operator, model, and routing details .

Mode-S A6BB18 frequently asked

What is Mode-S code A6BB18?
A6BB18 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N5326U.
Where is Mode-S A6BB18 registered?
Mode-S code A6BB18 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 A6BB18 broadcasting right now?
Yes. Mode-S A6BB18 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6BB18, octal 51535430, decimal 10,926,872.
What flights does A6BB18 operate?
Mode-S A6BB18 has broadcast 1 distinct callsign, including ILU26U.