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sensors Mode-S transponder

A646CF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N503TS · DIAMOND DA-42 Guardian · operated by COX AVIATION LLC

Hex
A646CF
Octal
51443317
Decimal
10,897,103
Country
US
Tail
N503TS
Type
DA42
No current signal · last broadcast 1d ago
Flights observed
56
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A646CF.

Country allocation

The ICAO 24-bit address A646CF 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
N503TS - 56 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N503TS - Jul 26, 17:50 UTCJul 26, 18:05 UTC15m
2026-07-26 N503TS - Jul 26, 13:15 UTCJul 26, 13:30 UTC15m
2026-07-24 N503TS - Jul 24, 19:40 UTCJul 24, 19:55 UTC15m
2026-07-23 N503TS - Jul 23, 18:35 UTCJul 23, 18:50 UTC15m
2026-07-15 N503TS - Jul 15, 19:35 UTCJul 15, 19:50 UTC15m
2026-07-14 N503TS - Jul 14, 19:35 UTCJul 14, 19:55 UTC20m
2026-07-09 N503TS - Jul 9, 19:20 UTCJul 9, 19:30 UTC10m
2026-07-09 N503TS - Jul 9, 13:20 UTCJul 9, 13:30 UTC10m
2026-07-07 N503TS - Jul 7, 23:05 UTCJul 7, 23:30 UTC25m
2026-07-07 N503TS - Jul 7, 17:30 UTCJul 7, 17:55 UTC25m
2026-07-06 N503TS - Jul 6, 19:35 UTCJul 6, 19:45 UTC10m
2026-07-06 N503TS EWB → MVY Jul 6, 13:45 UTCJul 6, 14:00 UTC15m
2026-07-05 N503TS - Jul 5, 23:50 UTCJul 6, 00:05 UTC15m
2026-07-02 N503TS - Jul 2, 21:25 UTCJul 2, 21:50 UTC25m
2026-07-02 N503TS MVY → EWB Jul 2, 18:55 UTCJul 2, 19:10 UTC15m
2026-07-02 N503TS EWB → MVY Jul 2, 16:50 UTCJul 2, 17:00 UTC10m
2026-06-29 N503TS - Jun 29, 20:49 UTCJun 29, 20:59 UTC10m
2026-06-29 N503TS - Jun 29, 15:09 UTCJun 29, 15:24 UTC15m
2026-06-29 N503TS - Jun 29, 13:59 UTCJun 29, 14:25 UTC25m
2026-06-25 N503TS - Jun 25, 23:55 UTCJun 26, 00:39 UTC45m
2026-06-25 N503TS - Jun 25, 21:25 UTCJun 25, 22:10 UTC45m
2026-06-25 N503TS - Jun 25, 18:45 UTCJun 25, 18:55 UTC10m
2026-06-25 N503TS - Jun 25, 15:50 UTCJun 25, 15:59 UTC10m
2026-06-21 N503TS - Jun 21, 19:29 UTCJun 21, 19:45 UTC15m
2026-06-17 N503TS - Jun 17, 18:30 UTCJun 17, 19:15 UTC45m
2026-06-17 N503TS - Jun 17, 16:15 UTCJun 17, 17:05 UTC50m
2026-06-12 N503TS MVY → EWB Jun 12, 19:20 UTCJun 12, 19:35 UTC15m
2026-06-12 N503TS - Jun 12, 17:55 UTCJun 12, 18:05 UTC10m
2026-06-11 N503TS - Jun 11, 18:30 UTCJun 11, 18:45 UTC15m
2026-06-10 N503TS - Jun 10, 14:35 UTCJun 10, 14:50 UTC15m
2026-06-09 N503TS - Jun 9, 16:45 UTCJun 9, 17:10 UTC25m
2026-06-07 N503TS - Jun 7, 18:00 UTCJun 7, 19:00 UTC1h 0m
2026-06-04 N503TS - Jun 4, 18:20 UTCJun 4, 18:35 UTC15m
2026-06-04 N503TS - Jun 4, 14:25 UTCJun 4, 14:35 UTC10m
2026-05-31 N503TS - May 31, 15:50 UTCMay 31, 16:20 UTC30m
2026-05-28 N503TS - May 28, 18:30 UTCMay 28, 18:40 UTC10m
2026-05-28 N503TS - May 28, 12:55 UTCMay 28, 13:05 UTC10m
2026-05-26 N503TS - May 26, 01:34 UTCMay 26, 01:55 UTC20m
2026-05-22 N503TS - May 22, 21:25 UTCMay 22, 21:45 UTC20m
2026-05-22 N503TS LWM → EWB May 22, 01:05 UTCMay 22, 01:35 UTC30m
2026-05-21 N503TS - May 21, 19:05 UTCMay 21, 19:45 UTC40m
2026-05-21 N503TS - May 21, 14:45 UTCMay 21, 14:55 UTC10m
2026-05-19 N503TS - May 19, 17:20 UTCMay 19, 17:30 UTC10m
2026-05-19 N503TS - May 19, 14:45 UTCMay 19, 14:55 UTC10m
2026-05-07 N503TS - May 7, 20:00 UTCMay 7, 20:10 UTC10m
2026-05-07 N503TS EWB → MVY May 7, 16:05 UTCMay 7, 16:20 UTC15m
2026-04-30 N503TS - Apr 30, 19:30 UTCApr 30, 19:45 UTC15m
2026-04-30 N503TS - Apr 30, 16:00 UTCApr 30, 16:15 UTC15m
2026-04-26 N503TS BBX → EWB Apr 26, 18:45 UTCApr 26, 20:30 UTC1h 45m
2026-04-24 N503TS - Apr 24, 18:55 UTCApr 24, 21:50 UTC2h 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 N503TS page for operator, model, and routing details .

Mode-S A646CF frequently asked

What is Mode-S code A646CF?
A646CF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N503TS.
Where is Mode-S A646CF registered?
Mode-S code A646CF 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 A646CF 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 A646CF, octal 51443317, decimal 10,897,103.
What flights does A646CF operate?
Mode-S A646CF has broadcast 1 distinct callsign, including N503TS.