Apparatus

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sensors Mode-S transponder

ABBDB5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N856AU · CESSNA 172 Skyhawk · operated by AUBURN UNIVERSITY

Hex
ABBDB5
Octal
52736665
Decimal
11,255,221
Country
US
Tail
N856AU
Type
C172
No current signal · last broadcast 10h ago
Flights observed
37
Distinct callsigns
1
Country
US
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S ABBDB5.

Country allocation

The ICAO 24-bit address ABBDB5 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
AUB145 - 37 2026-06-10

Recent flights last 37

DateFlightRouteTakeoffLandingDuration
2026-06-10 AUB145 - Jun 10, 17:25 UTCJun 10, 18:10 UTC45m
2026-06-10 AUB145 - Jun 10, 15:10 UTCJun 10, 16:00 UTC50m
2026-05-28 AUB145 AUO → AUO May 28, 12:10 UTCMay 28, 12:35 UTC25m
2026-05-28 AUB145 - May 28, 03:05 UTCMay 28, 03:10 UTC5m
2026-05-28 AUB145 AUO → AUO May 28, 02:45 UTCMay 28, 02:50 UTC5m
2026-05-28 AUB145 AUO → AUO May 28, 02:30 UTCMay 28, 02:35 UTC5m
2026-05-27 AUB145 AUO → AUO May 27, 17:30 UTCMay 27, 18:35 UTC1h 5m
2026-05-22 AUB145 - May 22, 17:50 UTCMay 22, 18:00 UTC10m
2026-05-22 AUB145 - May 22, 16:55 UTCMay 22, 17:05 UTC10m
2026-05-21 AUB145 - May 21, 23:50 UTCMay 22, 00:10 UTC20m
2026-05-21 AUB145 - May 21, 22:45 UTCMay 21, 22:55 UTC10m
2026-05-20 AUB145 - May 20, 15:00 UTCMay 20, 15:50 UTC50m
2026-05-20 AUB145 AUO → AUO May 20, 14:40 UTCMay 20, 14:45 UTC5m
2026-05-19 AUB145 AUO → AUO May 19, 18:20 UTCMay 19, 19:35 UTC1h 15m
2026-05-14 AUB145 AUO → AUO May 14, 19:00 UTCMay 14, 19:50 UTC50m
2026-05-13 AUB145 - May 13, 15:45 UTCMay 13, 16:05 UTC20m
2026-05-13 AUB145 - May 13, 13:55 UTCMay 13, 14:10 UTC15m
2026-05-11 AUB145 - May 11, 15:45 UTCMay 11, 15:55 UTC10m
2026-05-11 AUB145 - May 11, 14:30 UTCMay 11, 14:40 UTC10m
2026-05-08 AUB145 AUO → AUO May 8, 21:35 UTCMay 8, 22:10 UTC35m
2026-05-05 AUB145 AUO → AUO May 5, 16:40 UTCMay 5, 17:35 UTC55m
2026-05-04 AUB145 AUO → AUO May 4, 19:30 UTCMay 4, 19:35 UTC5m
2026-05-04 AUB145 - May 4, 16:55 UTCMay 4, 17:30 UTC35m
2026-05-04 AUB145 - May 4, 15:25 UTCMay 4, 16:10 UTC45m
2026-05-01 AUB145 AUO → AUO May 1, 20:00 UTCMay 1, 21:00 UTC1h 0m
2026-04-29 AUB145 AUO → AUO Apr 29, 19:15 UTCApr 29, 20:25 UTC1h 10m
2026-04-26 AUB145 AUO → AUO Apr 26, 20:10 UTCApr 26, 20:15 UTC5m
2026-04-26 AUB145 AUO → AUO Apr 26, 19:40 UTCApr 26, 20:05 UTC25m
2026-04-26 AUB145 AUO → AUO Apr 26, 18:30 UTCApr 26, 19:00 UTC30m
2026-04-26 AUB145 AUO → AUO Apr 26, 14:35 UTCApr 26, 15:10 UTC35m
2026-04-24 AUB145 AUO → AUO Apr 24, 20:55 UTCApr 24, 21:45 UTC50m
2026-04-24 AUB145 AUO → AUO Apr 24, 17:00 UTCApr 24, 18:00 UTC1h 0m
2026-04-23 AUB145 AUO → AUO Apr 23, 21:35 UTCApr 23, 22:40 UTC1h 5m
2026-04-23 AUB145 AUO → AUO Apr 23, 17:55 UTCApr 23, 19:05 UTC1h 10m
2026-04-22 AUB145 AUO → AUO Apr 22, 17:15 UTCApr 22, 18:20 UTC1h 5m
2026-04-21 AUB145 AUO → AUO Apr 21, 19:05 UTCApr 21, 20:10 UTC1h 5m
2026-04-21 AUB145 AUO → AUO Apr 21, 15:40 UTCApr 21, 16:31 UTC50m

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 N856AU page for operator, model, and routing details .

Mode-S ABBDB5 frequently asked

What is Mode-S code ABBDB5?
ABBDB5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N856AU.
Where is Mode-S ABBDB5 registered?
Mode-S code ABBDB5 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 ABBDB5 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 ABBDB5, octal 52736665, decimal 11,255,221.
What flights does ABBDB5 operate?
Mode-S ABBDB5 has broadcast 1 distinct callsign, including AUB145.