Apparatus

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sensors Mode-S transponder

A1A3BA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N20431 · CESSNA 172 Skyhawk · operated by ORGANIZATION OF BLACK AEROSPACE PROFESSIONALS

Hex
A1A3BA
Octal
50321672
Decimal
10,593,210
Country
US
Tail
N20431
Type
C172
Broadcasting now · callsign N20431 · 625 ft
Flights observed
85
Distinct callsigns
1
Country
US
Last broadcast
3d ago

Current position

A1A3BA is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1A3BA 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
N20431 - 85 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 N20431 - Jul 12, 17:45 UTCJul 12, 19:10 UTC1h 25m
2026-07-12 N20431 OLV → OLV Jul 12, 15:50 UTCJul 12, 16:35 UTC45m
2026-07-11 N20431 - Jul 11, 18:20 UTCJul 11, 19:20 UTC1h 0m
2026-07-11 N20431 - Jul 11, 15:20 UTCJul 11, 17:00 UTC1h 40m
2026-07-11 N20431 OLV → OLV Jul 11, 11:55 UTCJul 11, 13:30 UTC1h 35m
2026-07-10 N20431 - Jul 10, 22:00 UTCJul 10, 23:45 UTC1h 45m
2026-07-10 N20431 - Jul 10, 15:55 UTCJul 10, 16:20 UTC25m
2026-07-10 N20431 - Jul 10, 12:30 UTCJul 10, 13:25 UTC55m
2026-07-09 N20431 - Jul 9, 20:05 UTCJul 9, 21:05 UTC1h 0m
2026-07-09 N20431 OLV → OLV Jul 9, 17:10 UTCJul 9, 17:30 UTC20m
2026-07-07 N20431 - Jul 7, 02:55 UTCJul 7, 03:50 UTC55m
2026-07-06 N20431 - Jul 6, 19:05 UTCJul 6, 19:25 UTC20m
2026-07-06 N20431 - Jul 6, 18:15 UTCJul 6, 18:30 UTC15m
2026-07-06 N20431 - Jul 6, 16:05 UTCJul 6, 16:55 UTC50m
2026-07-04 N20431 - Jul 4, 17:20 UTCJul 4, 17:35 UTC15m
2026-07-04 N20431 - Jul 4, 16:10 UTCJul 4, 16:20 UTC10m
2026-07-03 N20431 - Jul 3, 15:40 UTCJul 3, 15:50 UTC10m
2026-07-03 N20431 - Jul 3, 13:50 UTCJul 3, 14:00 UTC10m
2026-07-02 N20431 - Jul 2, 21:45 UTCJul 2, 22:00 UTC15m
2026-07-02 N20431 - Jul 2, 19:55 UTCJul 2, 20:05 UTC10m
2026-07-02 N20431 OLV → OLV Jul 2, 15:35 UTCJul 2, 16:00 UTC25m
2026-07-02 N20431 OLV → OLV Jul 2, 14:45 UTCJul 2, 15:05 UTC20m
2026-07-01 N20431 OLV → OLV Jul 1, 15:55 UTCJul 1, 17:15 UTC1h 20m
2026-07-01 N20431 - Jul 1, 02:40 UTCJul 1, 03:45 UTC1h 5m
2026-06-30 N20431 OLV → OLV Jun 30, 22:05 UTCJun 30, 23:00 UTC55m
2026-06-30 N20431 - Jun 30, 16:55 UTCJun 30, 17:30 UTC35m
2026-06-29 N20431 - Jun 29, 22:15 UTCJun 29, 23:29 UTC1h 15m
2026-06-29 N20431 - Jun 29, 15:54 UTCJun 29, 17:14 UTC1h 20m
2026-06-27 N20431 - Jun 27, 23:25 UTCJun 28, 00:00 UTC35m
2026-06-24 N20431 - Jun 24, 16:29 UTCJun 24, 18:25 UTC1h 55m
2026-06-24 N20431 - Jun 24, 13:20 UTCJun 24, 14:45 UTC1h 25m
2026-06-23 N20431 - Jun 23, 23:00 UTCJun 23, 23:29 UTC30m
2026-06-23 N20431 - Jun 23, 20:49 UTCJun 23, 21:05 UTC15m
2026-06-23 N20431 - Jun 23, 17:04 UTCJun 23, 18:20 UTC1h 15m
2026-06-21 N20431 - Jun 21, 21:49 UTCJun 21, 22:34 UTC45m
2026-06-21 N20431 - Jun 21, 20:05 UTCJun 21, 20:54 UTC50m
2026-06-20 N20431 - Jun 20, 18:59 UTCJun 20, 19:34 UTC35m
2026-06-19 N20431 - Jun 19, 16:19 UTCJun 19, 17:04 UTC45m
2026-06-17 N20431 OLV → OLV Jun 17, 23:55 UTCJun 18, 01:45 UTC1h 50m
2026-06-13 N20431 - Jun 13, 17:25 UTCJun 13, 17:35 UTC10m
2026-06-12 N20431 - Jun 12, 14:25 UTCJun 12, 15:30 UTC1h 5m
2026-06-11 N20431 - Jun 11, 20:00 UTCJun 11, 21:10 UTC1h 10m
2026-06-11 N20431 - Jun 11, 17:15 UTCJun 11, 17:30 UTC15m
2026-06-11 N20431 - Jun 11, 16:10 UTCJun 11, 16:35 UTC25m
2026-06-10 N20431 - Jun 10, 18:20 UTCJun 10, 19:20 UTC1h 0m
2026-06-10 N20431 - Jun 10, 16:35 UTCJun 10, 16:45 UTC10m
2026-06-10 N20431 - Jun 10, 15:50 UTCJun 10, 16:00 UTC10m
2026-06-09 N20431 - Jun 9, 19:10 UTCJun 9, 20:05 UTC55m
2026-06-09 N20431 OLV → OLV Jun 9, 16:50 UTCJun 9, 17:45 UTC55m
2026-06-09 N20431 - Jun 9, 11:50 UTCJun 9, 12:10 UTC20m

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 N20431 page for operator, model, and routing details .

Mode-S A1A3BA frequently asked

What is Mode-S code A1A3BA?
A1A3BA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N20431.
Where is Mode-S A1A3BA registered?
Mode-S code A1A3BA 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 A1A3BA broadcasting right now?
Yes. Mode-S A1A3BA is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A3BA, octal 50321672, decimal 10,593,210.
What flights does A1A3BA operate?
Mode-S A1A3BA has broadcast 1 distinct callsign, including N20431.