Apparatus

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sensors Mode-S transponder

A2BA55

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N275PA · operated by EXPERIMENTAL AIRCRAFT ASSOCIATION INC

Hex
A2BA55
Octal
50535125
Decimal
10,664,533
Country
US
Tail
N275PA
Type
RV12
No current signal · last broadcast 3h ago
Flights observed
67
Distinct callsigns
1
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A2BA55.

Country allocation

The ICAO 24-bit address A2BA55 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
N275PA - 67 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N275PA - Jul 14, 15:10 UTCJul 14, 16:00 UTC50m
2026-07-13 N275PA - Jul 13, 18:30 UTCJul 13, 19:35 UTC1h 5m
2026-07-12 N275PA - Jul 12, 21:05 UTCJul 12, 22:20 UTC1h 15m
2026-06-26 N275PA - Jun 26, 23:19 UTCJun 27, 00:25 UTC1h 5m
2026-06-26 N275PA - Jun 26, 20:20 UTCJun 26, 21:39 UTC1h 20m
2026-06-26 N275PA - Jun 26, 14:05 UTCJun 26, 15:05 UTC1h 0m
2026-06-25 N275PA - Jun 25, 19:54 UTCJun 25, 20:25 UTC30m
2026-06-25 N275PA - Jun 25, 15:15 UTCJun 25, 15:44 UTC30m
2026-06-24 N275PA OSH → OSH Jun 24, 20:30 UTCJun 24, 21:24 UTC55m
2026-06-24 N275PA OSH → OSH Jun 24, 18:20 UTCJun 24, 18:44 UTC25m
2026-06-23 N275PA - Jun 23, 23:29 UTCJun 23, 23:59 UTC30m
2026-06-23 N275PA - Jun 23, 20:44 UTCJun 23, 21:49 UTC1h 5m
2026-06-23 N275PA - Jun 23, 17:04 UTCJun 23, 18:10 UTC1h 5m
2026-06-23 N275PA - Jun 23, 00:24 UTCJun 23, 01:25 UTC1h 0m
2026-06-22 N275PA - Jun 22, 19:09 UTCJun 22, 20:44 UTC1h 35m
2026-06-22 N275PA - Jun 22, 17:04 UTCJun 22, 17:40 UTC35m
2026-06-21 N275PA - Jun 21, 20:54 UTCJun 21, 22:29 UTC1h 35m
2026-06-21 N275PA - Jun 21, 17:45 UTCJun 21, 19:00 UTC1h 15m
2026-06-21 N275PA - Jun 21, 14:54 UTCJun 21, 16:14 UTC1h 20m
2026-06-20 N275PA OSH → OSH Jun 20, 23:39 UTCJun 21, 00:25 UTC45m
2026-06-20 N275PA OSH → OSH Jun 20, 17:39 UTCJun 20, 18:34 UTC55m
2026-06-20 N275PA - Jun 20, 12:34 UTCJun 20, 13:24 UTC50m
2026-06-19 N275PA - Jun 19, 20:14 UTCJun 19, 20:44 UTC30m
2026-06-19 N275PA - Jun 19, 16:09 UTCJun 19, 17:24 UTC1h 15m
2026-06-19 N275PA - Jun 19, 13:24 UTCJun 19, 14:44 UTC1h 20m
2026-06-18 N275PA - Jun 18, 18:05 UTCJun 18, 19:10 UTC1h 5m
2026-06-18 N275PA - Jun 18, 15:40 UTCJun 18, 16:50 UTC1h 10m
2026-06-18 N275PA OSH → OSH Jun 18, 13:00 UTCJun 18, 14:10 UTC1h 10m
2026-06-17 N275PA OSH → OSH Jun 17, 12:30 UTCJun 17, 13:20 UTC50m
2026-06-16 N275PA - Jun 16, 23:55 UTCJun 17, 00:45 UTC50m
2026-06-16 N275PA - Jun 16, 22:00 UTCJun 16, 22:50 UTC50m
2026-06-16 N275PA - Jun 16, 16:15 UTCJun 16, 17:15 UTC1h 0m
2026-06-16 N275PA OSH → OSH Jun 16, 13:25 UTCJun 16, 14:25 UTC1h 0m
2026-06-15 N275PA - Jun 15, 21:50 UTCJun 15, 22:54 UTC1h 5m
2026-06-15 N275PA OSH → OSH Jun 15, 19:05 UTCJun 15, 19:39 UTC35m
2026-06-15 N275PA - Jun 15, 15:59 UTCJun 15, 16:59 UTC1h 0m
2026-06-15 N275PA - Jun 15, 13:45 UTCJun 15, 14:50 UTC1h 5m
2026-06-15 N275PA - Jun 15, 01:30 UTCJun 15, 02:04 UTC35m
2026-06-13 N275PA - Jun 13, 23:50 UTCJun 14, 01:15 UTC1h 25m
2026-06-13 N275PA - Jun 13, 19:40 UTCJun 13, 20:45 UTC1h 5m
2026-06-13 N275PA - Jun 13, 17:00 UTCJun 13, 18:00 UTC1h 0m
2026-06-13 N275PA - Jun 13, 13:45 UTCJun 13, 15:10 UTC1h 25m
2026-06-12 N275PA - Jun 12, 13:40 UTCJun 12, 14:30 UTC50m
2026-06-11 N275PA - Jun 11, 16:05 UTCJun 11, 16:45 UTC40m
2026-06-11 N275PA - Jun 11, 13:30 UTCJun 11, 14:30 UTC1h 0m
2026-06-10 N275PA - Jun 10, 19:05 UTCJun 10, 19:45 UTC40m
2026-06-10 N275PA OSH → OSH Jun 10, 13:40 UTCJun 10, 14:20 UTC40m
2026-06-07 N275PA - Jun 7, 23:20 UTCJun 7, 23:55 UTC35m
2026-06-03 N275PA - Jun 3, 19:15 UTCJun 3, 20:45 UTC1h 30m
2026-06-02 N275PA - Jun 2, 19:15 UTCJun 2, 20:30 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 N275PA page for operator, model, and routing details .

Mode-S A2BA55 frequently asked

What is Mode-S code A2BA55?
A2BA55 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N275PA.
Where is Mode-S A2BA55 registered?
Mode-S code A2BA55 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 A2BA55 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2BA55, octal 50535125, decimal 10,664,533.
What flights does A2BA55 operate?
Mode-S A2BA55 has broadcast 1 distinct callsign, including N275PA.