Apparatus

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sensors Mode-S transponder

ABB78C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N854PU · PIPER PA-28-140/150/160/180 · operated by TRUSTEES OF PURDUE UNIVERSITY

Hex
ABB78C
Octal
52733614
Decimal
11,253,644
Country
US
Tail
N854PU
Type
P28A
No current signal · last broadcast 28d ago
Flights observed
92
Distinct callsigns
1
Country
US
Last broadcast
28d ago

Last known position

Most recent position reported by Mode-S ABB78C.

Country allocation

The ICAO 24-bit address ABB78C 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
PDU54 - 92 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-21 PDU54 LAF → LAF May 21, 11:50 UTCMay 21, 12:55 UTC1h 5m
2026-05-20 PDU54 LAF → LAF May 20, 21:00 UTCMay 20, 21:45 UTC45m
2026-05-20 PDU54 - May 20, 17:05 UTCMay 20, 19:25 UTC2h 20m
2026-05-20 PDU54 LAF → LAF May 20, 15:00 UTCMay 20, 16:05 UTC1h 5m
2026-05-19 PDU54 LAF → LAF May 19, 15:55 UTCMay 19, 16:50 UTC55m
2026-05-19 PDU54 - May 19, 13:40 UTCMay 19, 14:45 UTC1h 5m
2026-05-19 PDU54 - May 19, 12:15 UTCMay 19, 13:05 UTC50m
2026-05-18 PDU54 LAF → LAF May 18, 14:05 UTCMay 18, 15:10 UTC1h 5m
2026-05-18 PDU54 LAF → LAF May 18, 11:50 UTCMay 18, 12:35 UTC45m
2026-05-15 PDU54 LAF → LAF May 15, 16:40 UTCMay 15, 18:05 UTC1h 25m
2026-05-14 PDU54 LAF → LAF May 14, 21:25 UTCMay 14, 22:15 UTC50m
2026-05-14 PDU54 - May 14, 19:45 UTCMay 14, 20:35 UTC50m
2026-05-14 PDU54 - May 14, 17:10 UTCMay 14, 18:15 UTC1h 5m
2026-05-14 PDU54 - May 14, 15:30 UTCMay 14, 16:00 UTC30m
2026-05-14 PDU54 - May 14, 12:00 UTCMay 14, 14:01 UTC2h 0m
2026-05-13 PDU54 LAF → LAF May 13, 19:00 UTCMay 13, 21:20 UTC2h 20m
2026-05-13 PDU54 LAF → LAF May 13, 15:55 UTCMay 13, 17:50 UTC1h 55m
2026-05-13 PDU54 LAF → LAF May 13, 13:55 UTCMay 13, 14:40 UTC45m
2026-05-13 PDU54 LAF → LAF May 13, 12:15 UTCMay 13, 13:15 UTC1h 0m
2026-05-12 PDU54 LAF → LAF May 12, 20:55 UTCMay 12, 22:15 UTC1h 20m
2026-05-12 PDU54 LAF → LAF May 12, 18:40 UTCMay 12, 19:55 UTC1h 15m
2026-05-12 PDU54 LAF → LAF May 12, 15:35 UTCMay 12, 16:45 UTC1h 10m
2026-05-12 PDU54 LAF → LAF May 12, 13:25 UTCMay 12, 14:05 UTC40m
2026-05-11 PDU54 LAF → LAF May 11, 19:10 UTCMay 11, 20:15 UTC1h 5m
2026-05-11 PDU54 LAF → LAF May 11, 17:35 UTCMay 11, 17:50 UTC15m
2026-05-11 PDU54 LAF → LAF May 11, 15:10 UTCMay 11, 16:10 UTC1h 0m
2026-05-11 PDU54 - May 11, 13:50 UTCMay 11, 14:25 UTC35m
2026-05-11 PDU54 - May 11, 13:00 UTCMay 11, 13:45 UTC45m
2026-05-09 PDU54 LAF → LAF May 9, 17:15 UTCMay 9, 18:20 UTC1h 5m
2026-05-08 PDU54 LAF → LAF May 8, 21:55 UTCMay 9, 00:15 UTC2h 20m
2026-05-08 PDU54 - May 8, 20:30 UTCMay 8, 20:45 UTC15m
2026-05-08 PDU54 - May 8, 19:10 UTCMay 8, 19:50 UTC40m
2026-05-08 PDU54 LAF → LAF May 8, 16:15 UTCMay 8, 17:30 UTC1h 15m
2026-05-08 PDU54 LAF → LAF May 8, 14:15 UTCMay 8, 15:15 UTC1h 0m
2026-05-08 PDU54 LAF → LAF May 8, 12:20 UTCMay 8, 13:35 UTC1h 15m
2026-05-07 PDU54 - May 7, 23:49 UTCMay 8, 00:09 UTC20m
2026-05-07 PDU54 - May 7, 22:35 UTCMay 7, 23:45 UTC1h 10m
2026-05-07 PDU54 LAF → LAF May 7, 20:50 UTCMay 7, 21:35 UTC45m
2026-05-07 PDU54 LAF → LAF May 7, 16:55 UTCMay 7, 18:15 UTC1h 20m
2026-05-07 PDU54 LAF → LAF May 7, 15:55 UTCMay 7, 16:10 UTC15m
2026-05-07 PDU54 LAF → LAF May 7, 13:50 UTCMay 7, 15:00 UTC1h 10m
2026-05-07 PDU54 LAF → LAF May 7, 12:15 UTCMay 7, 13:10 UTC55m
2026-05-06 PDU54 LAF → LAF May 6, 23:15 UTCMay 7, 00:05 UTC50m
2026-05-06 PDU54 LAF → LAF May 6, 19:50 UTCMay 6, 22:00 UTC2h 10m
2026-05-06 PDU54 LAF → LAF May 6, 18:25 UTCMay 6, 19:20 UTC55m
2026-05-06 PDU54 - May 6, 15:50 UTCMay 6, 17:20 UTC1h 30m
2026-05-06 PDU54 LAF → LAF May 6, 13:50 UTCMay 6, 14:45 UTC55m
2026-05-06 PDU54 LAF → LAF May 6, 12:05 UTCMay 6, 12:50 UTC45m
2026-05-05 PDU54 LAF → LAF May 5, 23:15 UTCMay 6, 00:05 UTC50m
2026-05-05 PDU54 LAF → LAF May 5, 20:15 UTCMay 5, 20:30 UTC15m

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 N854PU page for operator, model, and routing details .

Mode-S ABB78C frequently asked

What is Mode-S code ABB78C?
ABB78C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N854PU.
Where is Mode-S ABB78C registered?
Mode-S code ABB78C 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 ABB78C broadcasting right now?
No active broadcast right now. Last signal was 28d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABB78C, octal 52733614, decimal 11,253,644.
What flights does ABB78C operate?
Mode-S ABB78C has broadcast 1 distinct callsign, including PDU54.