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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 14h ago
Flights observed
180
Distinct callsigns
1
Country
US
Last broadcast
14h 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 - 180 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N1242N - Jul 13, 17:45 UTCJul 13, 19:45 UTC2h 0m
2026-07-13 N1242N PAO → SMF Jul 13, 16:40 UTCJul 13, 17:40 UTC1h 0m
2026-07-12 N1242N - Jul 12, 23:30 UTCJul 13, 00:01 UTC30m
2026-07-12 N1242N - Jul 12, 23:15 UTCJul 12, 23:25 UTC10m
2026-07-12 N1242N - Jul 12, 23:00 UTCJul 12, 23:10 UTC10m
2026-07-12 N1242N - Jul 12, 22:30 UTCJul 12, 22:55 UTC25m
2026-07-12 N1242N PAO → PAO Jul 12, 14:30 UTCJul 12, 15:20 UTC50m
2026-07-12 N1242N PAO → PAO Jul 12, 00:20 UTCJul 12, 00:25 UTC5m
2026-07-11 N1242N PAO → PAO Jul 11, 23:10 UTCJul 12, 00:10 UTC1h 0m
2026-07-11 N1242N PAO → PAO Jul 11, 20:35 UTCJul 11, 21:55 UTC1h 20m
2026-07-11 N1242N PAO → PAO Jul 11, 17:50 UTCJul 11, 18:55 UTC1h 5m
2026-07-10 N1242N - Jul 10, 17:35 UTCJul 10, 18:45 UTC1h 10m
2026-07-10 N1242N - Jul 10, 15:40 UTCJul 10, 15:55 UTC15m
2026-07-09 N1242N - Jul 9, 16:40 UTCJul 9, 17:50 UTC1h 10m
2026-07-06 N1242N PAO → PAO Jul 6, 22:00 UTCJul 6, 23:10 UTC1h 10m
2026-07-06 N1242N PAO → PAO Jul 6, 18:00 UTCJul 6, 18:35 UTC35m
2026-07-05 N1242N PAO → PAO Jul 5, 19:25 UTCJul 5, 20:40 UTC1h 15m
2026-07-05 N1242N - Jul 5, 04:10 UTCJul 5, 05:15 UTC1h 5m
2026-07-05 N1242N - Jul 5, 00:25 UTCJul 5, 00:40 UTC15m
2026-07-04 N1242N PAO → PAO Jul 4, 22:20 UTCJul 4, 22:45 UTC25m
2026-07-04 N1242N PAO → PAO Jul 4, 17:05 UTCJul 4, 18:05 UTC1h 0m
2026-07-04 N1242N PAO → PAO Jul 4, 16:40 UTCJul 4, 16:50 UTC10m
2026-07-03 N1242N - Jul 3, 23:25 UTCJul 3, 23:50 UTC25m
2026-07-03 N1242N PAO → PAO Jul 3, 22:55 UTCJul 3, 23:20 UTC25m
2026-07-01 N1242N PAO → PAO Jul 1, 19:00 UTCJul 1, 19:35 UTC35m
2026-06-27 N1242N PAO → PAO Jun 27, 00:10 UTCJun 27, 00:29 UTC20m
2026-06-26 N1242N PAO → PAO Jun 26, 23:09 UTCJun 27, 00:05 UTC55m
2026-06-26 N1242N PAO → PAO Jun 26, 21:35 UTCJun 26, 21:59 UTC25m
2026-06-26 N1242N PAO → PAO Jun 26, 20:34 UTCJun 26, 21:30 UTC55m
2026-06-26 N1242N PAO → PAO Jun 26, 18:15 UTCJun 26, 19:00 UTC45m
2026-06-25 N1242N - Jun 25, 21:59 UTCJun 25, 22:10 UTC10m
2026-06-25 N1242N PAO → HWD Jun 25, 20:39 UTCJun 25, 21:50 UTC1h 10m
2026-06-24 N1242N PAO → PAO Jun 24, 23:40 UTCJun 25, 00:49 UTC1h 10m
2026-06-24 N1242N PAO → PAO Jun 24, 19:39 UTCJun 24, 20:40 UTC1h 0m
2026-06-24 N1242N PAO → PAO Jun 24, 17:20 UTCJun 24, 17:34 UTC15m
2026-06-24 N1242N PAO → PAO Jun 24, 16:19 UTCJun 24, 17:14 UTC55m
2026-06-24 N1242N PAO → PAO Jun 24, 01:34 UTCJun 24, 02:40 UTC1h 5m
2026-06-23 N1242N PAO → PAO Jun 23, 22:19 UTCJun 23, 23:44 UTC1h 25m
2026-06-23 N1242N PAO → PAO Jun 23, 16:44 UTCJun 23, 17:50 UTC1h 5m
2026-06-20 N1242N PAO → PAO Jun 20, 22:35 UTCJun 20, 22:54 UTC20m
2026-06-20 N1242N PAO → PAO Jun 20, 22:10 UTCJun 20, 22:20 UTC10m
2026-06-20 N1242N PAO → PAO Jun 20, 19:49 UTCJun 20, 20:34 UTC45m
2026-06-20 N1242N PAO → PAO Jun 20, 17:34 UTCJun 20, 17:39 UTC5m
2026-06-20 N1242N PAO → PAO Jun 20, 16:29 UTCJun 20, 17:29 UTC1h 0m
2026-06-19 N1242N - Jun 19, 20:40 UTCJun 19, 21:19 UTC40m
2026-06-19 N1242N PAO → PAO Jun 19, 20:29 UTCJun 19, 20:34 UTC5m
2026-06-19 N1242N PAO → PAO Jun 19, 05:24 UTCJun 19, 06:49 UTC1h 25m
2026-06-18 N1242N - Jun 18, 17:15 UTCJun 18, 17:30 UTC15m
2026-06-18 N1242N PAO → PAO Jun 18, 16:20 UTCJun 18, 17:10 UTC50m
2026-06-18 N1242N PAO → PAO Jun 18, 01:15 UTCJun 18, 03:10 UTC1h 55m

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 14h 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.