Apparatus

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sensors Mode-S transponder

ABCA1F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N859PU · PIPER PA-28-140/150/160/180 · operated by TRUSTEES OF PURDUE UNIVERSITY

Hex
ABCA1F
Octal
52745037
Decimal
11,258,399
Country
US
Tail
N859PU
Type
P28A
No current signal · last broadcast 2h ago
Flights observed
108
Distinct callsigns
1
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S ABCA1F.

Country allocation

The ICAO 24-bit address ABCA1F 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
PDU59 - 108 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 PDU59 - Jun 2, 21:50 UTCJun 2, 23:45 UTC1h 55m
2026-06-02 PDU59 - Jun 2, 19:05 UTCJun 2, 20:20 UTC1h 15m
2026-06-02 PDU59 - Jun 2, 16:20 UTCJun 2, 17:15 UTC55m
2026-06-02 PDU59 - Jun 2, 15:20 UTCJun 2, 15:30 UTC10m
2026-06-02 PDU59 - Jun 2, 13:50 UTCJun 2, 14:50 UTC1h 0m
2026-06-01 PDU59 LAF → LAF Jun 1, 22:55 UTCJun 2, 00:10 UTC1h 15m
2026-06-01 PDU59 - Jun 1, 20:15 UTCJun 1, 22:05 UTC1h 50m
2026-05-30 PDU59 LAF → LAF May 30, 21:05 UTCMay 30, 21:40 UTC35m
2026-05-30 PDU59 - May 30, 19:05 UTCMay 30, 20:10 UTC1h 5m
2026-05-30 PDU59 - May 30, 15:35 UTCMay 30, 18:10 UTC2h 35m
2026-05-30 PDU59 - May 30, 12:10 UTCMay 30, 14:35 UTC2h 25m
2026-05-29 PDU59 - May 29, 22:05 UTCMay 30, 00:00 UTC1h 55m
2026-05-29 PDU59 - May 29, 19:55 UTCMay 29, 21:05 UTC1h 10m
2026-05-29 PDU59 - May 29, 18:00 UTCMay 29, 19:15 UTC1h 15m
2026-05-29 PDU59 - May 29, 15:50 UTCMay 29, 17:05 UTC1h 15m
2026-05-05 PDU59 LAF → LAF May 5, 12:05 UTCMay 5, 13:00 UTC55m
2026-05-04 PDU59 LAF → LAF May 4, 20:00 UTCMay 4, 21:10 UTC1h 10m
2026-05-04 PDU59 LAF → LAF May 4, 16:20 UTCMay 4, 17:30 UTC1h 10m
2026-05-04 PDU59 LAF → LAF May 4, 14:00 UTCMay 4, 15:30 UTC1h 30m
2026-05-04 PDU59 LAF → LAF May 4, 12:05 UTCMay 4, 13:05 UTC1h 0m
2026-05-03 PDU59 LAF → LAF May 3, 17:50 UTCMay 3, 19:05 UTC1h 15m
2026-05-03 PDU59 LAF → LAF May 3, 15:40 UTCMay 3, 17:05 UTC1h 25m
2026-05-03 PDU59 - May 3, 13:50 UTCMay 3, 14:55 UTC1h 5m
2026-05-03 PDU59 - May 3, 13:00 UTCMay 3, 13:15 UTC15m
2026-05-03 PDU59 LAF → LAF May 3, 11:45 UTCMay 3, 12:15 UTC30m
2026-05-02 PDU59 LAF → LAF May 2, 21:50 UTCMay 2, 22:35 UTC45m
2026-05-02 PDU59 LAF → LAF May 2, 20:15 UTCMay 2, 20:55 UTC40m
2026-05-02 PDU59 LAF → LAF May 2, 18:05 UTCMay 2, 19:10 UTC1h 5m
2026-05-02 PDU59 LAF → LAF May 2, 16:05 UTCMay 2, 17:20 UTC1h 15m
2026-05-02 PDU59 LAF → LAF May 2, 14:00 UTCMay 2, 15:25 UTC1h 25m
2026-05-02 PDU59 LAF → LAF May 2, 12:20 UTCMay 2, 13:15 UTC55m
2026-05-02 PDU59 LAF → LAF May 2, 01:35 UTCMay 2, 04:40 UTC3h 5m
2026-05-01 PDU59 - May 1, 22:20 UTCMay 1, 23:05 UTC45m
2026-05-01 PDU59 - May 1, 21:20 UTCMay 1, 21:50 UTC30m
2026-05-01 PDU59 LAF → LAF May 1, 19:20 UTCMay 1, 20:20 UTC1h 0m
2026-05-01 PDU59 - May 1, 16:55 UTCMay 1, 18:10 UTC1h 15m
2026-05-01 PDU59 LAF → LAF May 1, 14:15 UTCMay 1, 16:00 UTC1h 45m
2026-05-01 PDU59 LAF → LAF May 1, 03:55 UTCMay 1, 04:30 UTC35m
2026-05-01 PDU59 LAF → LAF May 1, 01:15 UTCMay 1, 03:05 UTC1h 50m
2026-04-30 PDU59 - Apr 30, 22:05 UTCMay 1, 00:15 UTC2h 10m
2026-04-30 PDU59 LAF → LAF Apr 30, 18:10 UTCApr 30, 21:50 UTC3h 40m
2026-04-30 PDU59 - Apr 30, 16:00 UTCApr 30, 17:10 UTC1h 10m
2026-04-30 PDU59 LAF → LAF Apr 30, 13:55 UTCApr 30, 15:20 UTC1h 25m
2026-04-29 PDU59 - Apr 29, 20:45 UTCApr 29, 21:45 UTC1h 0m
2026-04-29 PDU59 LAF → LAF Apr 29, 18:45 UTCApr 29, 20:40 UTC1h 55m
2026-04-29 PDU59 LAF → LAF Apr 29, 15:50 UTCApr 29, 17:15 UTC1h 25m
2026-04-29 PDU59 LAF → LAF Apr 29, 13:50 UTCApr 29, 14:40 UTC50m
2026-04-29 PDU59 - Apr 29, 03:40 UTCApr 29, 04:20 UTC40m
2026-04-29 PDU59 - Apr 29, 01:35 UTCApr 29, 02:50 UTC1h 15m
2026-04-28 PDU59 LAF → LAF Apr 28, 22:40 UTCApr 29, 00:00 UTC1h 20m

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 N859PU page for operator, model, and routing details .

Mode-S ABCA1F frequently asked

What is Mode-S code ABCA1F?
ABCA1F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N859PU.
Where is Mode-S ABCA1F registered?
Mode-S code ABCA1F 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 ABCA1F broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABCA1F, octal 52745037, decimal 11,258,399.
What flights does ABCA1F operate?
Mode-S ABCA1F has broadcast 1 distinct callsign, including PDU59.