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 20d ago
Flights observed
220
Distinct callsigns
1
Country
US
Last broadcast
20d 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 - 220 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 PDU55 - Jul 24, 16:00 UTCJul 24, 17:15 UTC1h 15m
2026-07-24 PDU55 - Jul 24, 13:45 UTCJul 24, 14:50 UTC1h 5m
2026-07-23 PDU55 LAF → LAF Jul 23, 17:55 UTCJul 23, 19:15 UTC1h 20m
2026-07-22 PDU55 - Jul 22, 16:35 UTCJul 22, 16:50 UTC15m
2026-07-22 PDU55 - Jul 22, 14:50 UTCJul 22, 16:00 UTC1h 10m
2026-07-16 PDU55 LAF → LAF Jul 16, 15:10 UTCJul 16, 16:19 UTC1h 10m
2026-07-15 PDU55 LAF → LAF Jul 15, 19:55 UTCJul 15, 21:05 UTC1h 10m
2026-07-14 PDU55 - Jul 14, 15:05 UTCJul 14, 16:15 UTC1h 10m
2026-07-13 PDU55 - Jul 13, 15:00 UTCJul 13, 16:15 UTC1h 15m
2026-07-09 PDU55 LAF → LAF Jul 9, 14:40 UTCJul 9, 16:45 UTC2h 5m
2026-07-01 PDU55 LAF → LAF Jul 1, 17:35 UTCJul 1, 19:00 UTC1h 25m
2026-07-01 PDU55 - Jul 1, 14:50 UTCJul 1, 16:20 UTC1h 30m
2026-07-01 PDU55 LAF → LAF Jul 1, 11:55 UTCJul 1, 14:00 UTC2h 5m
2026-07-01 PDU55 LAF → LAF Jul 1, 02:45 UTCJul 1, 03:30 UTC45m
2026-06-30 PDU55 LAF → LAF Jun 30, 23:20 UTCJul 1, 00:15 UTC55m
2026-06-30 PDU55 LAF → LAF Jun 30, 20:50 UTCJun 30, 22:05 UTC1h 15m
2026-06-30 PDU55 LAF → LAF Jun 30, 19:05 UTCJun 30, 20:00 UTC55m
2026-06-30 PDU55 LAF → LAF Jun 30, 16:45 UTCJun 30, 18:05 UTC1h 20m
2026-06-30 PDU55 LAF → LAF Jun 30, 14:55 UTCJun 30, 16:00 UTC1h 5m
2026-06-30 PDU55 - Jun 30, 13:45 UTCJun 30, 14:10 UTC25m
2026-06-30 PDU55 - Jun 30, 12:00 UTCJun 30, 13:05 UTC1h 5m
2026-06-29 PDU55 LAF → LAF Jun 29, 22:55 UTCJun 30, 00:04 UTC1h 10m
2026-06-29 PDU55 LAF → LAF Jun 29, 19:44 UTCJun 29, 21:34 UTC1h 50m
2026-06-29 PDU55 LAF → LAF Jun 29, 17:55 UTCJun 29, 18:55 UTC1h 0m
2026-06-29 PDU55 LAF → LAF Jun 29, 14:54 UTCJun 29, 16:10 UTC1h 15m
2026-06-29 PDU55 LAF → LAF Jun 29, 12:45 UTCJun 29, 13:59 UTC1h 15m
2026-06-26 PDU55 LAF → LAF Jun 26, 16:00 UTCJun 26, 17:09 UTC1h 10m
2026-06-26 PDU55 - Jun 26, 14:15 UTCJun 26, 15:20 UTC1h 5m
2026-06-26 PDU55 LAF → LAF Jun 26, 03:10 UTCJun 26, 03:20 UTC10m
2026-06-26 PDU55 LAF → LAF Jun 26, 02:30 UTCJun 26, 03:05 UTC35m
2026-06-25 PDU55 LAF → LAF Jun 25, 21:15 UTCJun 25, 22:14 UTC1h 0m
2026-06-25 PDU55 LAF → LAF Jun 25, 18:10 UTCJun 25, 19:05 UTC55m
2026-06-25 PDU55 LAF → LAF Jun 25, 16:14 UTCJun 25, 17:14 UTC1h 0m
2026-06-25 PDU55 LAF → LAF Jun 25, 12:50 UTCJun 25, 14:09 UTC1h 20m
2026-06-24 PDU55 LAF → LAF Jun 24, 22:00 UTCJun 24, 23:10 UTC1h 10m
2026-06-24 PDU55 LAF → LAF Jun 24, 19:00 UTCJun 24, 21:04 UTC2h 5m
2026-06-24 PDU55 LAF → LAF Jun 24, 17:25 UTCJun 24, 18:20 UTC55m
2026-06-24 PDU55 - Jun 24, 14:45 UTCJun 24, 16:09 UTC1h 25m
2026-06-24 PDU55 LAF → LAF Jun 24, 12:20 UTCJun 24, 13:10 UTC50m
2026-06-24 PDU55 - Jun 24, 03:24 UTCJun 24, 03:55 UTC30m
2026-06-24 PDU55 - Jun 24, 01:55 UTCJun 24, 02:49 UTC55m
2026-06-23 PDU55 - Jun 23, 23:10 UTCJun 24, 00:20 UTC1h 10m
2026-06-23 PDU55 LAF → LAF Jun 23, 20:54 UTCJun 23, 22:05 UTC1h 10m
2026-06-23 PDU55 - Jun 23, 18:39 UTCJun 23, 19:39 UTC1h 0m
2026-06-23 PDU55 - Jun 23, 16:54 UTCJun 23, 18:04 UTC1h 10m
2026-06-23 PDU55 - Jun 23, 15:04 UTCJun 23, 16:05 UTC1h 0m
2026-06-23 PDU55 - Jun 23, 12:55 UTCJun 23, 14:19 UTC1h 25m
2026-06-22 PDU55 - Jun 22, 22:44 UTCJun 23, 00:15 UTC1h 30m
2026-06-20 PDU55 LAF → LAF Jun 20, 17:59 UTCJun 20, 19:15 UTC1h 15m
2026-06-20 PDU55 LAF → LAF Jun 20, 14:14 UTCJun 20, 16:00 UTC1h 45m

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 20d 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.