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sensors Mode-S transponder

AA3AA4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N75839 · CESSNA 172 Skyhawk · operated by ROCKY MOUNTAIN AIRCRAFT SERVICES LLC

Hex
AA3AA4
Octal
52435244
Decimal
11,156,132
Country
US
Tail
N75839
Type
C172
Broadcasting now · callsign N75839 · 7,575 ft
Flights observed
103
Distinct callsigns
1
Country
US
Last broadcast
2h ago

Current position

AA3AA4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AA3AA4 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
N75839 - 103 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 N75839 BJC → BJC Jul 18, 13:15 UTCJul 18, 14:20 UTC1h 5m
2026-07-17 N75839 BJC → BJC Jul 17, 17:35 UTCJul 17, 18:44 UTC1h 10m
2026-07-17 N75839 BJC → BJC Jul 17, 13:00 UTCJul 17, 14:30 UTC1h 30m
2026-07-16 N75839 BJC → BJC Jul 16, 23:59 UTCJul 17, 02:10 UTC2h 10m
2026-07-16 N75839 BJC → BJC Jul 16, 20:49 UTCJul 16, 22:25 UTC1h 35m
2026-07-16 N75839 BJC → BJC Jul 16, 17:10 UTCJul 16, 18:40 UTC1h 30m
2026-07-16 N75839 BJC → BJC Jul 16, 14:10 UTCJul 16, 15:35 UTC1h 25m
2026-07-15 N75839 BJC → BJC Jul 15, 18:25 UTCJul 15, 20:05 UTC1h 40m
2026-07-15 N75839 BJC → BJC Jul 15, 14:05 UTCJul 15, 15:35 UTC1h 30m
2026-07-15 N75839 BJC → BJC Jul 15, 01:20 UTCJul 15, 02:35 UTC1h 15m
2026-07-14 N75839 BJC → BJC Jul 14, 22:05 UTCJul 14, 23:55 UTC1h 49m
2026-07-14 N75839 BJC → BJC Jul 14, 17:55 UTCJul 14, 19:45 UTC1h 50m
2026-07-14 N75839 BJC → BJC Jul 14, 15:40 UTCJul 14, 17:05 UTC1h 25m
2026-07-14 N75839 BJC → BJC Jul 14, 12:00 UTCJul 14, 13:35 UTC1h 35m
2026-07-14 N75839 BJC → BJC Jul 14, 02:35 UTCJul 14, 04:55 UTC2h 20m
2026-07-12 N75839 BJC → BJC Jul 12, 17:45 UTCJul 12, 18:25 UTC40m
2026-07-11 N75839 - Jul 11, 17:20 UTCJul 11, 17:45 UTC25m
2026-07-11 N75839 - Jul 11, 14:50 UTCJul 11, 15:55 UTC1h 5m
2026-07-10 N75839 BJC → BJC Jul 10, 21:10 UTCJul 10, 22:05 UTC55m
2026-07-10 N75839 BJC → BJC Jul 10, 17:45 UTCJul 10, 19:35 UTC1h 50m
2026-07-09 N75839 BJC → BJC Jul 9, 18:20 UTCJul 9, 19:25 UTC1h 5m
2026-07-09 N75839 BJC → BJC Jul 9, 14:40 UTCJul 9, 15:55 UTC1h 15m
2026-07-09 N75839 BJC → BJC Jul 9, 12:25 UTCJul 9, 13:45 UTC1h 20m
2026-07-02 N75839 BJC → BJC Jul 2, 16:15 UTCJul 2, 16:55 UTC40m
2026-07-02 N75839 BJC → BJC Jul 2, 01:15 UTCJul 2, 02:30 UTC1h 15m
2026-07-01 N75839 BJC → BJC Jul 1, 17:45 UTCJul 1, 19:15 UTC1h 30m
2026-07-01 N75839 BJC → BJC Jul 1, 15:55 UTCJul 1, 16:50 UTC55m
2026-06-25 N75839 - Jun 25, 17:25 UTCJun 25, 17:49 UTC25m
2026-06-25 N75839 - Jun 25, 16:05 UTCJun 25, 16:20 UTC15m
2026-06-24 N75839 BJC → BJC Jun 24, 17:20 UTCJun 24, 18:09 UTC50m
2026-06-24 N75839 BJC → BJC Jun 24, 15:00 UTCJun 24, 15:54 UTC55m
2026-06-24 N75839 BJC → BJC Jun 24, 01:44 UTCJun 24, 03:00 UTC1h 15m
2026-06-23 N75839 - Jun 23, 15:24 UTCJun 23, 17:39 UTC2h 15m
2026-06-23 N75839 BJC → BJC Jun 23, 11:59 UTCJun 23, 13:50 UTC1h 50m
2026-06-22 N75839 BJC → BJC Jun 22, 13:10 UTCJun 22, 15:24 UTC2h 15m
2026-06-21 N75839 - Jun 21, 16:19 UTCJun 21, 16:59 UTC40m
2026-06-20 N75839 BJC → BJC Jun 20, 19:24 UTCJun 20, 20:05 UTC40m
2026-06-18 N75839 BJC → BJC Jun 18, 12:20 UTCJun 18, 13:55 UTC1h 35m
2026-06-17 N75839 BJC → BJC Jun 17, 05:40 UTCJun 17, 05:50 UTC10m
2026-06-17 N75839 BJC → BJC Jun 17, 05:05 UTCJun 17, 05:10 UTC5m
2026-06-17 N75839 BJC → BJC Jun 17, 04:45 UTCJun 17, 04:50 UTC5m
2026-06-16 N75839 BJC → BJC Jun 16, 22:35 UTCJun 17, 00:00 UTC1h 25m
2026-06-16 N75839 BJC → BJC Jun 16, 15:00 UTCJun 16, 16:20 UTC1h 20m
2026-06-16 N75839 BJC → BJC Jun 16, 00:55 UTCJun 16, 02:20 UTC1h 25m
2026-06-15 N75839 BJC → BJC Jun 15, 22:10 UTCJun 15, 22:59 UTC50m
2026-06-13 N75839 BJC → BJC Jun 13, 18:40 UTCJun 13, 20:00 UTC1h 20m
2026-06-12 N75839 BJC → BJC Jun 12, 19:10 UTCJun 12, 19:45 UTC35m
2026-06-12 N75839 BJC → BJC Jun 12, 16:35 UTCJun 12, 17:55 UTC1h 20m
2026-06-11 N75839 BJC → BJC Jun 11, 18:35 UTCJun 11, 19:45 UTC1h 10m
2026-05-29 N75839 BJC → BJC May 29, 18:30 UTCMay 29, 19:00 UTC30m

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 N75839 page for operator, model, and routing details .

Mode-S AA3AA4 frequently asked

What is Mode-S code AA3AA4?
AA3AA4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N75839.
Where is Mode-S AA3AA4 registered?
Mode-S code AA3AA4 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 AA3AA4 broadcasting right now?
Yes. Mode-S AA3AA4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA3AA4, octal 52435244, decimal 11,156,132.
What flights does AA3AA4 operate?
Mode-S AA3AA4 has broadcast 1 distinct callsign, including N75839.