Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4945B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N3942Z · PIPER PA-18 Super Cub · operated by HIGH EXPOSURE INC, RODNEY BLDG STE 104

Hex
A4945B
Octal
51112133
Decimal
10,785,883
Country
US
Tail
N3942Z
Type
PA18
No current signal · last broadcast 26d ago
Flights observed
37
Distinct callsigns
1
Country
US
Last broadcast
26d ago

Last known position

Most recent position reported by Mode-S A4945B.

Country allocation

The ICAO 24-bit address A4945B 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
N3942Z - 37 2026-07-26

Recent flights last 37

DateFlightRouteTakeoffLandingDuration
2026-07-26 N3942Z - Jul 26, 20:00 UTCJul 26, 21:05 UTC1h 5m
2026-07-26 N3942Z - Jul 26, 17:45 UTCJul 26, 18:50 UTC1h 5m
2026-07-26 N3942Z - Jul 26, 15:05 UTCJul 26, 16:55 UTC1h 50m
2026-07-25 N3942Z - Jul 25, 23:05 UTCJul 25, 23:45 UTC40m
2026-07-25 N3942Z - Jul 25, 20:40 UTCJul 25, 21:50 UTC1h 10m
2026-07-25 N3942Z - Jul 25, 18:45 UTCJul 25, 19:45 UTC1h 0m
2026-07-25 N3942Z - Jul 25, 17:50 UTCJul 25, 18:10 UTC20m
2026-07-25 N3942Z - Jul 25, 14:40 UTCJul 25, 17:15 UTC2h 35m
2026-07-24 N3942Z - Jul 24, 16:20 UTCJul 24, 19:45 UTC3h 25m
2026-07-23 N3942Z - Jul 23, 20:55 UTCJul 23, 21:40 UTC45m
2026-07-23 N3942Z - Jul 23, 19:15 UTCJul 23, 19:35 UTC20m
2026-07-23 N3942Z - Jul 23, 15:30 UTCJul 23, 18:35 UTC3h 5m
2026-07-20 N3942Z - Jul 20, 23:00 UTCJul 20, 23:55 UTC55m
2026-07-20 N3942Z - Jul 20, 17:30 UTCJul 20, 20:35 UTC3h 5m
2026-07-20 N3942Z - Jul 20, 15:00 UTCJul 20, 16:50 UTC1h 50m
2026-07-19 N3942Z - Jul 19, 23:10 UTCJul 19, 23:35 UTC25m
2026-07-19 N3942Z - Jul 19, 22:30 UTCJul 19, 22:40 UTC10m
2026-07-19 N3942Z - Jul 19, 18:40 UTCJul 19, 21:40 UTC3h 0m
2026-07-19 N3942Z - Jul 19, 14:35 UTCJul 19, 17:55 UTC3h 20m
2026-07-18 N3942Z - Jul 18, 15:05 UTCJul 18, 15:15 UTC10m
2026-07-15 N3942Z - Jul 15, 00:30 UTCJul 15, 00:55 UTC25m
2026-07-14 N3942Z - Jul 14, 18:55 UTCJul 14, 23:25 UTC4h 29m
2026-07-14 N3942Z - Jul 14, 17:45 UTCJul 14, 18:05 UTC20m
2026-07-12 N3942Z - Jul 12, 18:10 UTCJul 12, 19:05 UTC55m
2026-07-12 N3942Z - Jul 12, 16:25 UTCJul 12, 17:01 UTC35m
2026-07-11 N3942Z - Jul 11, 15:25 UTCJul 11, 16:50 UTC1h 25m
2026-07-05 N3942Z - Jul 5, 20:45 UTCJul 5, 21:45 UTC1h 0m
2026-07-05 N3942Z - Jul 5, 14:15 UTCJul 5, 20:00 UTC5h 45m
2026-07-04 N3942Z - Jul 4, 21:30 UTCJul 4, 22:15 UTC45m
2026-07-04 N3942Z - Jul 4, 19:25 UTCJul 4, 20:55 UTC1h 30m
2026-07-04 N3942Z - Jul 4, 15:25 UTCJul 4, 18:30 UTC3h 5m
2026-07-04 N3942Z - Jul 4, 14:10 UTCJul 4, 14:50 UTC40m
2026-07-03 N3942Z - Jul 3, 20:50 UTCJul 3, 21:40 UTC50m
2026-07-03 N3942Z - Jul 3, 16:40 UTCJul 3, 20:15 UTC3h 35m
2026-07-03 N3942Z - Jul 3, 15:15 UTCJul 3, 16:05 UTC50m
2026-07-02 N3942Z - Jul 2, 16:50 UTCJul 2, 18:50 UTC2h 0m
2026-07-01 N3942Z - Jul 1, 19:30 UTCJul 1, 19:50 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 N3942Z page for operator, model, and routing details .

Mode-S A4945B frequently asked

What is Mode-S code A4945B?
A4945B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N3942Z.
Where is Mode-S A4945B registered?
Mode-S code A4945B 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 A4945B broadcasting right now?
No active broadcast right now. Last signal was 26d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4945B, octal 51112133, decimal 10,785,883.
What flights does A4945B operate?
Mode-S A4945B has broadcast 1 distinct callsign, including N3942Z.