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sensors Mode-S transponder

A15739

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N186CS · CESSNA 172 Skyhawk · operated by FLYING ROCK AERO LLC

Hex
A15739
Octal
50253471
Decimal
10,573,625
Country
US
Tail
N186CS
Type
C172
No current signal · last broadcast 10h ago
Flights observed
172
Distinct callsigns
1
Country
US
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S A15739.

Country allocation

The ICAO 24-bit address A15739 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
N186CS - 172 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N186CS PAO → PAO Jul 13, 22:10 UTCJul 14, 00:10 UTC2h 0m
2026-07-13 N186CS PAO → PAO Jul 13, 16:35 UTCJul 13, 18:40 UTC2h 5m
2026-07-12 N186CS PAO → PAO Jul 12, 17:20 UTCJul 12, 18:25 UTC1h 5m
2026-07-12 N186CS PAO → PAO Jul 12, 17:10 UTCJul 12, 17:15 UTC5m
2026-07-11 N186CS PAO → PAO Jul 11, 22:50 UTCJul 11, 23:35 UTC45m
2026-07-10 N186CS PAO → PAO Jul 10, 21:55 UTCJul 10, 23:30 UTC1h 35m
2026-07-10 N186CS PAO → PAO Jul 10, 18:55 UTCJul 10, 20:40 UTC1h 45m
2026-07-09 N186CS PAO → PAO Jul 9, 18:00 UTCJul 9, 19:45 UTC1h 45m
2026-07-08 N186CS PAO → PAO Jul 8, 18:00 UTCJul 8, 19:55 UTC1h 55m
2026-07-06 N186CS PAO → PAO Jul 6, 22:55 UTCJul 7, 00:00 UTC1h 5m
2026-07-06 N186CS PAO → PAO Jul 6, 15:55 UTCJul 6, 17:45 UTC1h 50m
2026-07-06 N186CS PAO → PAO Jul 6, 01:00 UTCJul 6, 01:40 UTC40m
2026-07-05 N186CS PAO → PAO Jul 5, 23:30 UTCJul 5, 23:35 UTC5m
2026-07-05 N186CS PAO → PAO Jul 5, 01:30 UTCJul 5, 01:35 UTC5m
2026-07-05 N186CS PAO → PAO Jul 5, 00:35 UTCJul 5, 01:15 UTC40m
2026-07-04 N186CS UKI → PAO Jul 4, 21:30 UTCJul 4, 22:55 UTC1h 25m
2026-07-04 N186CS - Jul 4, 19:35 UTCJul 4, 20:45 UTC1h 10m
2026-07-03 N186CS PAO → PAO Jul 3, 22:05 UTCJul 3, 22:30 UTC25m
2026-07-03 N186CS PAO → PAO Jul 3, 21:50 UTCJul 3, 22:00 UTC10m
2026-07-03 N186CS PAO → PAO Jul 3, 18:35 UTCJul 3, 19:50 UTC1h 15m
2026-07-02 N186CS PAO → PAO Jul 2, 20:50 UTCJul 2, 21:45 UTC55m
2026-06-30 N186CS - Jun 30, 22:20 UTCJun 30, 22:25 UTC5m
2026-06-30 N186CS - Jun 30, 21:55 UTCJun 30, 22:05 UTC10m
2026-06-30 N186CS PAO → PAO Jun 30, 02:00 UTCJun 30, 02:10 UTC10m
2026-06-30 N186CS PAO → PAO Jun 30, 01:40 UTCJun 30, 01:45 UTC5m
2026-06-30 N186CS - Jun 30, 00:04 UTCJun 30, 00:09 UTC5m
2026-06-29 N186CS PAO → PAO Jun 29, 23:19 UTCJun 30, 00:00 UTC40m
2026-06-28 N186CS PAO → PAO Jun 28, 18:14 UTCJun 28, 19:49 UTC1h 35m
2026-06-27 N186CS PAO → PAO Jun 27, 15:49 UTCJun 27, 17:14 UTC1h 25m
2026-06-22 N186CS PAO → PAO Jun 22, 19:40 UTCJun 22, 21:30 UTC1h 50m
2026-06-16 N186CS PAO → PAO Jun 16, 20:45 UTCJun 16, 23:50 UTC3h 5m
2026-06-16 N186CS PAO → PAO Jun 16, 17:40 UTCJun 16, 17:55 UTC15m
2026-06-16 N186CS PAO → PAO Jun 16, 16:50 UTCJun 16, 17:35 UTC45m
2026-06-15 N186CS PAO → PAO Jun 15, 22:15 UTCJun 16, 00:00 UTC1h 45m
2026-06-15 N186CS PAO → PAO Jun 15, 18:20 UTCJun 15, 20:45 UTC2h 25m
2026-06-14 N186CS PAO → PAO Jun 14, 18:30 UTCJun 14, 20:15 UTC1h 45m
2026-06-13 N186CS PAO → PAO Jun 13, 22:00 UTCJun 13, 23:50 UTC1h 50m
2026-06-12 N186CS PAO → PAO Jun 12, 23:05 UTCJun 12, 23:10 UTC5m
2026-06-12 N186CS PAO → PAO Jun 12, 22:20 UTCJun 12, 22:25 UTC5m
2026-06-12 N186CS PAO → PAO Jun 12, 22:05 UTCJun 12, 22:10 UTC5m
2026-06-12 N186CS - Jun 12, 21:40 UTCJun 12, 22:00 UTC20m
2026-06-12 N186CS PAO → PAO Jun 12, 02:35 UTCJun 12, 03:40 UTC1h 5m
2026-06-11 N186CS PAO → PAO Jun 11, 17:55 UTCJun 11, 18:30 UTC35m
2026-06-10 N186CS PAO → PAO Jun 10, 20:00 UTCJun 10, 20:40 UTC40m
2026-06-08 N186CS PAO → PAO Jun 8, 22:10 UTCJun 9, 00:10 UTC2h 0m
2026-06-08 N186CS PAO → PAO Jun 8, 18:00 UTCJun 8, 19:50 UTC1h 50m
2026-06-08 N186CS PAO → PAO Jun 8, 01:40 UTCJun 8, 02:55 UTC1h 15m
2026-06-07 N186CS PAO → PAO Jun 7, 16:45 UTCJun 7, 17:20 UTC35m
2026-06-06 N186CS - Jun 6, 23:24 UTCJun 7, 00:25 UTC1h 0m
2026-06-06 N186CS - Jun 6, 17:54 UTCJun 6, 19:34 UTC1h 40m

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 N186CS page for operator, model, and routing details .

Mode-S A15739 frequently asked

What is Mode-S code A15739?
A15739 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N186CS.
Where is Mode-S A15739 registered?
Mode-S code A15739 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 A15739 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A15739, octal 50253471, decimal 10,573,625.
What flights does A15739 operate?
Mode-S A15739 has broadcast 1 distinct callsign, including N186CS.