Apparatus

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sensors Mode-S transponder

ABBB43

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N855PU · PIPER PA-28-140/150/160/180 · operated by TRUSTEES OF PURDUE UNIVERSITY

Hex
ABBB43
Octal
52735503
Decimal
11,254,595
Country
US
Tail
N855PU
Type
P28A
No current signal · last broadcast 1d ago
Flights observed
128
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S ABBB43.

Country allocation

The ICAO 24-bit address ABBB43 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
PDU55 - 128 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 PDU55 LAF → LAF May 28, 22:40 UTCMay 28, 23:50 UTC1h 10m
2026-05-28 PDU55 - May 28, 20:50 UTCMay 28, 21:35 UTC45m
2026-05-28 PDU55 - May 28, 17:55 UTCMay 28, 19:05 UTC1h 10m
2026-05-28 PDU55 LAF → LAF May 28, 16:10 UTCMay 28, 17:10 UTC1h 0m
2026-05-28 PDU55 - May 28, 14:00 UTCMay 28, 15:20 UTC1h 20m
2026-05-28 PDU55 - May 28, 12:15 UTCMay 28, 13:15 UTC1h 0m
2026-05-27 PDU55 - May 27, 21:45 UTCMay 27, 23:15 UTC1h 30m
2026-05-27 PDU55 - May 27, 18:35 UTCMay 27, 20:45 UTC2h 10m
2026-05-27 PDU55 LAF → LAF May 27, 15:55 UTCMay 27, 17:20 UTC1h 25m
2026-05-27 PDU55 - May 27, 01:54 UTCMay 27, 03:54 UTC2h 0m
2026-05-26 PDU55 LAF → LAF May 26, 21:55 UTCMay 26, 23:05 UTC1h 10m
2026-05-26 PDU55 - May 26, 19:50 UTCMay 26, 21:09 UTC1h 20m
2026-05-26 PDU55 - May 26, 17:44 UTCMay 26, 19:10 UTC1h 25m
2026-05-26 PDU55 LAF → LAF May 26, 16:40 UTCMay 26, 17:09 UTC30m
2026-05-26 PDU55 LAF → LAF May 26, 14:55 UTCMay 26, 16:10 UTC1h 15m
2026-05-26 PDU55 - May 26, 12:35 UTCMay 26, 14:00 UTC1h 25m
2026-05-23 PDU55 - May 23, 18:10 UTCMay 23, 19:45 UTC1h 35m
2026-05-22 PDU55 - May 22, 20:15 UTCMay 22, 21:25 UTC1h 10m
2026-05-22 PDU55 LAF → LAF May 22, 17:55 UTCMay 22, 18:55 UTC1h 0m
2026-05-22 PDU55 - May 22, 14:15 UTCMay 22, 15:10 UTC55m
2026-05-22 PDU55 LAF → LAF May 22, 12:30 UTCMay 22, 13:10 UTC40m
2026-05-22 PDU55 LAF → LAF May 22, 02:10 UTCMay 22, 04:30 UTC2h 20m
2026-05-21 PDU55 - May 21, 22:15 UTCMay 21, 23:30 UTC1h 15m
2026-05-21 PDU55 - May 21, 19:05 UTCMay 21, 20:30 UTC1h 25m
2026-05-21 PDU55 LAF → LAF May 21, 16:45 UTCMay 21, 18:00 UTC1h 15m
2026-05-21 PDU55 LAF → LAF May 21, 15:10 UTCMay 21, 15:50 UTC40m
2026-05-21 PDU55 LAF → LAF May 21, 12:15 UTCMay 21, 13:30 UTC1h 15m
2026-05-20 PDU55 - May 20, 20:05 UTCMay 20, 21:15 UTC1h 10m
2026-05-20 PDU55 LAF → LAF May 20, 17:45 UTCMay 20, 18:35 UTC50m
2026-05-20 PDU55 LAF → LAF May 20, 16:00 UTCMay 20, 16:45 UTC45m
2026-05-20 PDU55 LAF → LAF May 20, 14:15 UTCMay 20, 15:15 UTC1h 0m
2026-05-20 PDU55 LAF → LAF May 20, 12:05 UTCMay 20, 13:00 UTC55m
2026-05-20 PDU55 - May 20, 02:10 UTCMay 20, 02:30 UTC20m
2026-05-19 PDU55 - May 19, 23:45 UTCMay 20, 00:15 UTC30m
2026-05-19 PDU55 - May 19, 22:10 UTCMay 19, 23:05 UTC55m
2026-05-19 PDU55 LAF → LAF May 19, 16:45 UTCMay 19, 17:35 UTC50m
2026-05-19 PDU55 LAF → LAF May 19, 13:45 UTCMay 19, 14:45 UTC1h 0m
2026-05-18 PDU55 LAF → LAF May 18, 13:30 UTCMay 18, 15:05 UTC1h 35m
2026-05-14 PDU55 LAF → LAF May 14, 19:10 UTCMay 14, 20:35 UTC1h 25m
2026-05-14 PDU55 LAF → LAF May 14, 15:15 UTCMay 14, 16:25 UTC1h 10m
2026-05-14 PDU55 LAF → LAF May 14, 12:40 UTCMay 14, 14:01 UTC1h 20m
2026-05-13 PDU55 LAF → LAF May 13, 20:20 UTCMay 13, 21:45 UTC1h 25m
2026-05-13 PDU55 LAF → LAF May 13, 17:15 UTCMay 13, 18:05 UTC50m
2026-05-13 PDU55 LAF → LAF May 13, 15:00 UTCMay 13, 16:00 UTC1h 0m
2026-05-13 PDU55 LAF → LAF May 13, 13:31 UTCMay 13, 14:10 UTC40m
2026-05-12 PDU55 LAF → LAF May 12, 21:10 UTCMay 12, 22:01 UTC50m
2026-05-12 PDU55 LAF → LAF May 12, 14:05 UTCMay 12, 15:15 UTC1h 10m
2026-05-12 PDU55 - May 12, 11:55 UTCMay 12, 13:10 UTC1h 15m
2026-05-11 PDU55 LAF → LAF May 11, 17:50 UTCMay 11, 21:35 UTC3h 45m
2026-05-11 PDU55 LAF → LAF May 11, 15:50 UTCMay 11, 17:05 UTC1h 16m

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 N855PU page for operator, model, and routing details .

Mode-S ABBB43 frequently asked

What is Mode-S code ABBB43?
ABBB43 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N855PU.
Where is Mode-S ABBB43 registered?
Mode-S code ABBB43 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 ABBB43 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABBB43, octal 52735503, decimal 11,254,595.
What flights does ABBB43 operate?
Mode-S ABBB43 has broadcast 1 distinct callsign, including PDU55.