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sensors Mode-S transponder

A27A3B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N259PJ · BOEING-VERTOL CH-47 Chinook · operated by PJ HELICOPTERS INC

Hex
A27A3B
Octal
50475073
Decimal
10,648,123
Country
US
Tail
N259PJ
Type
H47
No current signal · last broadcast Jul 25, 09:30 UTC
Flights observed
38
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 09:30 UTC

Last known position

Most recent position reported by Mode-S A27A3B.

Country allocation

The ICAO 24-bit address A27A3B 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
N259PJ - 38 2026-07-25

Recent flights last 38

DateFlightRouteTakeoffLandingDuration
2026-07-25 N259PJ - Jul 25, 09:00 UTCJul 25, 09:30 UTC30m
2026-07-25 N259PJ - Jul 25, 03:30 UTCJul 25, 04:00 UTC30m
2026-07-22 N259PJ - Jul 22, 02:10 UTCJul 22, 02:35 UTC25m
2026-07-21 N259PJ - Jul 21, 09:10 UTCJul 21, 09:40 UTC30m
2026-07-21 N259PJ - Jul 21, 03:20 UTCJul 21, 03:45 UTC25m
2026-07-16 N259PJ - Jul 16, 22:45 UTCJul 17, 00:35 UTC1h 50m
2026-07-16 N259PJ - Jul 16, 09:15 UTCJul 16, 09:25 UTC10m
2026-07-16 N259PJ - Jul 16, 07:25 UTCJul 16, 07:35 UTC10m
2026-07-16 N259PJ - Jul 16, 06:00 UTCJul 16, 06:15 UTC15m
2026-07-16 N259PJ - Jul 16, 04:25 UTCJul 16, 04:35 UTC10m
2026-07-16 N259PJ - Jul 16, 01:20 UTCJul 16, 02:50 UTC1h 30m
2026-07-12 N259PJ - Jul 12, 23:30 UTCJul 13, 01:20 UTC1h 50m
2026-07-08 N259PJ - Jul 8, 00:05 UTCJul 8, 00:35 UTC30m
2026-07-02 N259PJ - Jul 2, 02:40 UTCJul 2, 03:15 UTC35m
2026-06-22 N259PJ - Jun 22, 02:30 UTCJun 22, 02:40 UTC10m
2026-06-21 N259PJ - Jun 21, 01:25 UTCJun 21, 01:39 UTC15m
2026-06-19 N259PJ - Jun 19, 00:45 UTCJun 19, 02:39 UTC1h 55m
2026-06-18 N259PJ - Jun 18, 22:10 UTCJun 19, 00:00 UTC1h 50m
2026-06-17 N259PJ - Jun 17, 23:15 UTCJun 18, 00:45 UTC1h 30m
2026-06-16 N259PJ - Jun 16, 08:55 UTCJun 16, 09:50 UTC55m
2026-06-16 N259PJ HMT → HMT Jun 16, 04:39 UTCJun 16, 05:40 UTC1h 0m
2026-06-16 N259PJ - Jun 16, 01:50 UTCJun 16, 03:45 UTC1h 55m
2026-06-14 N259PJ - Jun 14, 01:40 UTCJun 14, 02:05 UTC25m
2026-06-13 N259PJ - Jun 13, 22:55 UTCJun 14, 00:55 UTC2h 0m
2026-06-05 N259PJ - Jun 5, 22:25 UTCJun 5, 23:15 UTC50m
2026-06-05 N259PJ MCC → MCC Jun 5, 04:10 UTCJun 5, 05:55 UTC1h 45m
2026-06-04 N259PJ - Jun 4, 23:15 UTCJun 4, 23:50 UTC35m
2026-06-04 N259PJ MCC → MCC Jun 4, 04:30 UTCJun 4, 06:05 UTC1h 35m
2026-06-03 N259PJ MCC → MCC Jun 3, 23:20 UTCJun 4, 00:10 UTC50m
2026-06-03 N259PJ MCC → MCC Jun 3, 04:30 UTCJun 3, 06:00 UTC1h 30m
2026-06-03 N259PJ - Jun 3, 00:00 UTCJun 3, 00:35 UTC35m
2026-05-29 N259PJ MCC → MCC May 29, 17:00 UTCMay 29, 17:15 UTC15m
2026-05-27 N259PJ - May 27, 18:10 UTCMay 27, 18:55 UTC45m
2026-05-01 N259PJ - May 1, 16:10 UTCMay 1, 17:40 UTC1h 30m
2026-04-19 N259PJ - Apr 19, 08:35 UTCApr 19, 08:50 UTC15m
2026-04-19 N259PJ - Apr 19, 07:05 UTCApr 19, 07:40 UTC35m
2026-04-19 N259PJ - Apr 19, 06:00 UTCApr 19, 06:25 UTC25m
2026-04-19 N259PJ - Apr 19, 04:00 UTCApr 19, 05:15 UTC1h 15m

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 N259PJ page for operator, model, and routing details .

Mode-S A27A3B frequently asked

What is Mode-S code A27A3B?
A27A3B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N259PJ.
Where is Mode-S A27A3B registered?
Mode-S code A27A3B 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 A27A3B broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 09:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A27A3B, octal 50475073, decimal 10,648,123.
What flights does A27A3B operate?
Mode-S A27A3B has broadcast 1 distinct callsign, including N259PJ.