Apparatus

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sensors Mode-S transponder

A5EEBB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4810U · PIPER PA-28-140/150/160/180 · operated by UNIVERSITY OF OKLAHOMA, BOARD OF REGENTS

Hex
A5EEBB
Octal
51367273
Decimal
10,874,555
Country
US
Tail
N4810U
Type
P28A
No current signal · last broadcast 11d ago
Flights observed
107
Distinct callsigns
1
Country
US
Last broadcast
11d ago

Last known position

Most recent position reported by Mode-S A5EEBB.

Country allocation

The ICAO 24-bit address A5EEBB 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
OUA4 - 107 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 OUA4 - Jul 26, 15:35 UTCJul 26, 16:10 UTC35m
2026-07-25 OUA4 - Jul 25, 19:50 UTCJul 25, 21:05 UTC1h 15m
2026-07-25 OUA4 - Jul 25, 16:40 UTCJul 25, 17:20 UTC40m
2026-07-25 OUA4 - Jul 25, 14:55 UTCJul 25, 15:50 UTC55m
2026-07-23 OUA4 - Jul 23, 17:35 UTCJul 23, 18:10 UTC35m
2026-07-23 OUA4 - Jul 23, 14:40 UTCJul 23, 15:40 UTC1h 0m
2026-07-23 OUA4 - Jul 23, 00:45 UTCJul 23, 01:40 UTC55m
2026-07-22 OUA4 - Jul 22, 16:20 UTCJul 22, 16:55 UTC35m
2026-07-20 OUA4 OUN → OUN Jul 20, 21:50 UTCJul 20, 22:25 UTC35m
2026-07-20 OUA4 - Jul 20, 19:10 UTCJul 20, 20:00 UTC50m
2026-07-20 OUA4 - Jul 20, 16:30 UTCJul 20, 17:05 UTC35m
2026-07-20 OUA4 - Jul 20, 13:35 UTCJul 20, 14:20 UTC45m
2026-07-19 OUA4 - Jul 19, 00:45 UTCJul 19, 01:30 UTC45m
2026-07-18 OUA4 OUN → OUN Jul 18, 19:30 UTCJul 18, 20:05 UTC35m
2026-07-18 OUA4 OUN → OUN Jul 18, 17:55 UTCJul 18, 18:30 UTC35m
2026-07-18 OUA4 - Jul 18, 14:20 UTCJul 18, 15:00 UTC40m
2026-07-17 OUA4 - Jul 17, 20:04 UTCJul 17, 20:44 UTC40m
2026-07-17 OUA4 - Jul 17, 02:34 UTCJul 17, 03:34 UTC1h 0m
2026-07-17 OUA4 - Jul 17, 01:00 UTCJul 17, 01:29 UTC30m
2026-07-16 OUA4 - Jul 16, 02:25 UTCJul 16, 03:05 UTC40m
2026-07-15 OUA4 - Jul 15, 23:20 UTCJul 16, 00:10 UTC50m
2026-07-15 OUA4 - Jul 15, 16:10 UTCJul 15, 16:40 UTC30m
2026-07-15 OUA4 - Jul 15, 14:30 UTCJul 15, 15:00 UTC30m
2026-07-15 OUA4 - Jul 15, 02:15 UTCJul 15, 02:55 UTC40m
2026-07-15 OUA4 - Jul 15, 00:10 UTCJul 15, 01:00 UTC50m
2026-07-14 OUA4 - Jul 14, 19:55 UTCJul 14, 20:35 UTC40m
2026-07-14 OUA4 - Jul 14, 17:30 UTCJul 14, 18:25 UTC55m
2026-07-14 OUA4 - Jul 14, 16:00 UTCJul 14, 16:35 UTC35m
2026-07-14 OUA4 - Jul 14, 12:55 UTCJul 14, 13:25 UTC30m
2026-07-14 OUA4 - Jul 14, 04:05 UTCJul 14, 06:30 UTC2h 25m
2026-07-13 OUA4 - Jul 13, 21:30 UTCJul 13, 22:30 UTC1h 0m
2026-07-13 OUA4 - Jul 13, 20:05 UTCJul 13, 20:35 UTC30m
2026-07-13 OUA4 - Jul 13, 16:20 UTCJul 13, 16:40 UTC20m
2026-07-13 OUA4 - Jul 13, 14:25 UTCJul 13, 15:05 UTC40m
2026-07-13 OUA4 - Jul 13, 03:15 UTCJul 13, 04:00 UTC45m
2026-07-13 OUA4 - Jul 13, 00:40 UTCJul 13, 01:25 UTC45m
2026-07-12 OUA4 - Jul 12, 18:25 UTCJul 12, 18:55 UTC30m
2026-07-11 OUA4 - Jul 11, 19:50 UTCJul 11, 20:50 UTC1h 0m
2026-07-11 OUA4 - Jul 11, 15:00 UTCJul 11, 17:50 UTC2h 50m
2026-07-11 OUA4 - Jul 11, 12:40 UTCJul 11, 13:35 UTC55m
2026-07-10 OUA4 OUN → OUN Jul 10, 22:10 UTCJul 10, 22:40 UTC30m
2026-07-10 OUA4 - Jul 10, 20:00 UTCJul 10, 20:35 UTC35m
2026-07-10 OUA4 - Jul 10, 16:15 UTCJul 10, 17:55 UTC1h 40m
2026-07-10 OUA4 - Jul 10, 14:25 UTCJul 10, 14:40 UTC15m
2026-07-10 OUA4 - Jul 10, 13:00 UTCJul 10, 13:15 UTC15m
2026-07-10 OUA4 - Jul 10, 00:50 UTCJul 10, 01:00 UTC10m
2026-07-09 OUA4 - Jul 9, 23:30 UTCJul 10, 00:00 UTC30m
2026-07-09 OUA4 - Jul 9, 22:35 UTCJul 9, 22:45 UTC10m
2026-07-09 OUA4 - Jul 9, 21:35 UTCJul 9, 21:50 UTC15m
2026-07-09 OUA4 - Jul 9, 19:40 UTCJul 9, 20:15 UTC35m

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 N4810U page for operator, model, and routing details .

Mode-S A5EEBB frequently asked

What is Mode-S code A5EEBB?
A5EEBB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4810U.
Where is Mode-S A5EEBB registered?
Mode-S code A5EEBB 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 A5EEBB broadcasting right now?
No active broadcast right now. Last signal was 11d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5EEBB, octal 51367273, decimal 10,874,555.
What flights does A5EEBB operate?
Mode-S A5EEBB has broadcast 1 distinct callsign, including OUA4.