Apparatus

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sensors Mode-S transponder

ABB3D5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N853PU · PIPER PA-28-140/150/160/180 · operated by TRUSTEES OF PURDUE UNIVERSITY

Hex
ABB3D5
Octal
52731725
Decimal
11,252,693
Country
US
Tail
N853PU
Type
P28A
No current signal · last broadcast 7d ago
Flights observed
247
Distinct callsigns
1
Country
US
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S ABB3D5.

Country allocation

The ICAO 24-bit address ABB3D5 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
PDU53 - 247 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 PDU53 - Jul 23, 18:20 UTCJul 23, 19:15 UTC55m
2026-07-23 PDU53 - Jul 23, 16:00 UTCJul 23, 17:15 UTC1h 15m
2026-07-23 PDU53 LAF → LAF Jul 23, 13:55 UTCJul 23, 14:50 UTC55m
2026-07-23 PDU53 - Jul 23, 12:20 UTCJul 23, 12:55 UTC35m
2026-07-22 PDU53 LAF → LAF Jul 22, 19:00 UTCJul 22, 20:10 UTC1h 10m
2026-07-22 PDU53 LAF → LAF Jul 22, 16:55 UTCJul 22, 18:15 UTC1h 20m
2026-07-22 PDU53 - Jul 22, 14:40 UTCJul 22, 16:00 UTC1h 20m
2026-07-22 PDU53 LAF → LAF Jul 22, 12:50 UTCJul 22, 13:55 UTC1h 5m
2026-07-22 PDU53 LAF → LAF Jul 22, 01:40 UTCJul 22, 04:55 UTC3h 15m
2026-07-21 PDU53 LAF → LAF Jul 21, 23:00 UTCJul 21, 23:55 UTC55m
2026-07-21 PDU53 LAF → LAF Jul 21, 20:10 UTCJul 21, 21:15 UTC1h 5m
2026-07-21 PDU53 LAF → LAF Jul 21, 18:00 UTCJul 21, 19:15 UTC1h 15m
2026-07-20 PDU53 LAF → LAF Jul 20, 20:35 UTCJul 20, 21:45 UTC1h 10m
2026-07-20 PDU53 LAF → LAF Jul 20, 18:30 UTCJul 20, 19:20 UTC50m
2026-07-20 PDU53 LAF → LAF Jul 20, 17:50 UTCJul 20, 18:25 UTC35m
2026-07-20 PDU53 - Jul 20, 15:25 UTCJul 20, 16:20 UTC55m
2026-07-20 PDU53 - Jul 20, 12:15 UTCJul 20, 13:35 UTC1h 20m
2026-07-18 PDU53 LAF → LAF Jul 18, 19:15 UTCJul 18, 20:25 UTC1h 10m
2026-07-18 PDU53 LAF → LAF Jul 18, 14:10 UTCJul 18, 15:00 UTC50m
2026-07-16 PDU53 LAF → LAF Jul 16, 21:25 UTCJul 16, 22:10 UTC45m
2026-07-16 PDU53 LAF → LAF Jul 16, 20:05 UTCJul 16, 20:35 UTC30m
2026-07-16 PDU53 LAF → LAF Jul 16, 15:40 UTCJul 16, 16:44 UTC1h 5m
2026-07-16 PDU53 LAF → LAF Jul 16, 13:15 UTCJul 16, 14:05 UTC50m
2026-07-15 PDU53 LAF → LAF Jul 15, 19:55 UTCJul 15, 21:00 UTC1h 5m
2026-07-15 PDU53 LAF → LAF Jul 15, 18:05 UTCJul 15, 18:55 UTC50m
2026-07-15 PDU53 LAF → LAF Jul 15, 16:10 UTCJul 15, 16:55 UTC45m
2026-07-15 PDU53 LAF → LAF Jul 15, 14:10 UTCJul 15, 15:05 UTC55m
2026-07-15 PDU53 - Jul 15, 03:05 UTCJul 15, 03:35 UTC30m
2026-07-15 PDU53 - Jul 15, 02:10 UTCJul 15, 02:30 UTC20m
2026-07-14 PDU53 LAF → LAF Jul 14, 19:45 UTCJul 14, 20:40 UTC55m
2026-07-14 PDU53 LAF → LAF Jul 14, 18:05 UTCJul 14, 19:05 UTC1h 0m
2026-07-14 PDU53 LAF → LAF Jul 14, 15:30 UTCJul 14, 16:20 UTC50m
2026-07-14 PDU53 - Jul 14, 13:15 UTCJul 14, 14:30 UTC1h 15m
2026-07-13 PDU53 LAF → LAF Jul 13, 18:05 UTCJul 13, 19:15 UTC1h 10m
2026-07-13 PDU53 - Jul 13, 16:00 UTCJul 13, 16:55 UTC55m
2026-07-13 PDU53 - Jul 13, 13:10 UTCJul 13, 14:55 UTC1h 45m
2026-07-09 PDU53 LAF → LAF Jul 9, 14:25 UTCJul 9, 15:55 UTC1h 30m
2026-07-08 PDU53 LAF → LAF Jul 8, 22:10 UTCJul 8, 23:45 UTC1h 35m
2026-07-08 PDU53 LAF → LAF Jul 8, 19:50 UTCJul 8, 21:05 UTC1h 15m
2026-07-08 PDU53 LAF → LAF Jul 8, 16:55 UTCJul 8, 17:55 UTC1h 0m
2026-07-08 PDU53 - Jul 8, 15:20 UTCJul 8, 15:50 UTC30m
2026-07-08 PDU53 - Jul 8, 14:00 UTCJul 8, 14:35 UTC35m
2026-07-07 PDU53 - Jul 7, 21:55 UTCJul 7, 23:35 UTC1h 40m
2026-07-07 PDU53 - Jul 7, 16:10 UTCJul 7, 17:15 UTC1h 5m
2026-07-07 PDU53 - Jul 7, 14:10 UTCJul 7, 15:00 UTC50m
2026-07-06 PDU53 LAF → LAF Jul 6, 19:15 UTCJul 6, 20:15 UTC1h 0m
2026-07-06 PDU53 LAF → LAF Jul 6, 16:45 UTCJul 6, 18:05 UTC1h 20m
2026-06-25 PDU53 LAF → LAF Jun 25, 12:04 UTCJun 25, 13:09 UTC1h 5m
2026-06-24 PDU53 LAF → LAF Jun 24, 23:00 UTCJun 25, 00:14 UTC1h 15m
2026-06-24 PDU53 LAF → LAF Jun 24, 20:54 UTCJun 24, 22:04 UTC1h 10m

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 N853PU page for operator, model, and routing details .

Mode-S ABB3D5 frequently asked

What is Mode-S code ABB3D5?
ABB3D5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N853PU.
Where is Mode-S ABB3D5 registered?
Mode-S code ABB3D5 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 ABB3D5 broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABB3D5, octal 52731725, decimal 11,252,693.
What flights does ABB3D5 operate?
Mode-S ABB3D5 has broadcast 1 distinct callsign, including PDU53.