Apparatus

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sensors Mode-S transponder

A06539

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1242N · CESSNA 172 Skyhawk · operated by JC ATHERTON LLC

Hex
A06539
Octal
50062471
Decimal
10,511,673
Country
US
Tail
N1242N
Type
C172
No current signal · last broadcast 1d ago
Flights observed
83
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A06539.

Country allocation

The ICAO 24-bit address A06539 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
N1242N - 83 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 N1242N PAO → PAO May 29, 03:15 UTCMay 29, 03:25 UTC10m
2026-05-29 N1242N PAO → PAO May 29, 02:35 UTCMay 29, 02:40 UTC5m
2026-05-27 N1242N PAO → PAO May 27, 02:19 UTCMay 27, 03:09 UTC50m
2026-05-26 N1242N PAO → PAO May 26, 18:40 UTCMay 26, 18:45 UTC5m
2026-05-26 N1242N PAO → PAO May 26, 18:24 UTCMay 26, 18:34 UTC10m
2026-05-26 N1242N PAO → PAO May 26, 17:55 UTCMay 26, 18:10 UTC15m
2026-05-25 N1242N PAO → PAO May 25, 21:24 UTCMay 25, 22:19 UTC55m
2026-05-25 N1242N PAO → PAO May 25, 17:45 UTCMay 25, 18:00 UTC15m
2026-05-25 N1242N PAO → PAO May 25, 17:25 UTCMay 25, 17:40 UTC15m
2026-05-24 N1242N PAO → PAO May 24, 20:10 UTCMay 24, 20:45 UTC35m
2026-05-23 N1242N PAO → PAO May 23, 23:00 UTCMay 23, 23:30 UTC30m
2026-05-23 N1242N PAO → PAO May 23, 19:50 UTCMay 23, 19:55 UTC5m
2026-05-23 N1242N PAO → PAO May 23, 19:20 UTCMay 23, 19:35 UTC15m
2026-05-22 N1242N PAO → PAO May 22, 21:40 UTCMay 22, 23:00 UTC1h 20m
2026-05-22 N1242N PAO → PAO May 22, 19:05 UTCMay 22, 19:10 UTC5m
2026-05-22 N1242N RHV → PAO May 22, 18:35 UTCMay 22, 18:55 UTC20m
2026-05-22 N1242N PAO → RHV May 22, 18:05 UTCMay 22, 18:20 UTC15m
2026-05-22 N1242N PAO → PAO May 22, 00:15 UTCMay 22, 01:20 UTC1h 5m
2026-05-21 N1242N PAO → PAO May 21, 21:30 UTCMay 21, 23:15 UTC1h 45m
2026-05-21 N1242N SJC → PAO May 21, 19:00 UTCMay 21, 19:10 UTC10m
2026-05-21 N1242N PAO → SJC May 21, 18:45 UTCMay 21, 18:55 UTC10m
2026-05-20 N1242N PAO → PAO May 20, 18:05 UTCMay 20, 18:20 UTC15m
2026-05-20 N1242N PAO → PAO May 20, 17:35 UTCMay 20, 17:40 UTC5m
2026-05-17 N1242N PAO → PAO May 17, 20:10 UTCMay 17, 20:30 UTC20m
2026-05-17 N1242N PAO → PAO May 17, 19:55 UTCMay 17, 20:01 UTC5m
2026-05-16 N1242N PAO → PAO May 16, 19:35 UTCMay 16, 20:25 UTC50m
2026-05-16 N1242N PAO → PAO May 16, 01:20 UTCMay 16, 01:40 UTC20m
2026-05-15 N1242N - May 15, 19:30 UTCMay 15, 19:40 UTC10m
2026-05-15 N1242N PAO → SQL May 15, 17:55 UTCMay 15, 19:05 UTC1h 10m
2026-05-15 N1242N PAO → PAO May 15, 00:05 UTCMay 15, 01:40 UTC1h 35m
2026-05-14 N1242N PAO → PAO May 14, 02:55 UTCMay 14, 03:30 UTC35m
2026-05-14 N1242N PAO → PAO May 14, 01:20 UTCMay 14, 01:25 UTC5m
2026-05-14 N1242N PAO → PAO May 14, 01:05 UTCMay 14, 01:15 UTC10m
2026-05-14 N1242N PAO → PAO May 14, 00:40 UTCMay 14, 00:50 UTC10m
2026-05-12 N1242N MER → PAO May 12, 18:55 UTCMay 12, 20:10 UTC1h 15m
2026-05-12 N1242N - May 12, 17:05 UTCMay 12, 18:10 UTC1h 5m
2026-05-10 N1242N - May 10, 17:49 UTCMay 10, 18:49 UTC1h 0m
2026-05-10 N1242N - May 10, 15:39 UTCMay 10, 16:20 UTC40m
2026-05-09 N1242N PAO → PAO May 9, 18:50 UTCMay 9, 22:55 UTC4h 5m
2026-05-09 N1242N - May 9, 00:05 UTCMay 9, 01:35 UTC1h 30m
2026-05-08 N1242N PAO → SBP May 8, 17:40 UTCMay 8, 19:05 UTC1h 25m
2026-05-08 N1242N PAO → PAO May 8, 00:20 UTCMay 8, 02:19 UTC2h 0m
2026-05-06 N1242N PAO → PAO May 6, 19:15 UTCMay 6, 20:00 UTC45m
2026-05-05 N1242N PAO → PAO May 5, 21:55 UTCMay 5, 22:15 UTC20m
2026-05-05 N1242N PAO → PAO May 5, 21:25 UTCMay 5, 21:45 UTC20m
2026-05-04 N1242N PAO → PAO May 4, 18:25 UTCMay 4, 18:30 UTC5m
2026-05-04 N1242N - May 4, 18:00 UTCMay 4, 18:05 UTC5m
2026-05-04 N1242N PAO → PAO May 4, 17:45 UTCMay 4, 17:55 UTC10m
2026-05-02 N1242N HWD → PAO May 2, 21:55 UTCMay 2, 22:30 UTC35m
2026-05-02 N1242N PAO → HWD May 2, 21:25 UTCMay 2, 21:50 UTC25m

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 N1242N page for operator, model, and routing details .

Mode-S A06539 frequently asked

What is Mode-S code A06539?
A06539 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1242N.
Where is Mode-S A06539 registered?
Mode-S code A06539 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 A06539 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A06539, octal 50062471, decimal 10,511,673.
What flights does A06539 operate?
Mode-S A06539 has broadcast 1 distinct callsign, including N1242N.