Apparatus

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sensors Mode-S transponder

A740C3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N56686 · PIPER PA-34 Seneca · operated by PARIS AIR INC

Hex
A740C3
Octal
51640303
Decimal
10,961,091
Country
US
Tail
N56686
Type
PA34
No current signal · last broadcast 3h ago
Flights observed
57
Distinct callsigns
2
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A740C3.

Country allocation

The ICAO 24-bit address A740C3 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 2 distinct

Callsign Airline Flights Last seen
N56686 - 36 2026-06-26
PFA259 - 21 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 PFA259 - Jul 14, 18:25 UTCJul 14, 19:00 UTC35m
2026-07-14 PFA259 - Jul 14, 15:25 UTCJul 14, 15:45 UTC20m
2026-07-13 PFA259 - Jul 13, 16:05 UTCJul 13, 16:55 UTC50m
2026-07-13 PFA259 - Jul 13, 14:55 UTCJul 13, 15:15 UTC20m
2026-07-13 PFA259 - Jul 13, 13:05 UTCJul 13, 13:30 UTC25m
2026-07-12 PFA259 - Jul 12, 18:05 UTCJul 12, 18:50 UTC45m
2026-07-12 PFA259 - Jul 12, 14:55 UTCJul 12, 15:25 UTC30m
2026-07-10 PFA259 - Jul 10, 13:15 UTCJul 10, 14:05 UTC50m
2026-07-09 PFA259 - Jul 9, 21:10 UTCJul 9, 23:00 UTC1h 50m
2026-07-09 PFA259 - Jul 9, 15:35 UTCJul 9, 16:15 UTC40m
2026-07-09 PFA259 - Jul 9, 13:55 UTCJul 9, 14:15 UTC20m
2026-07-09 PFA259 - Jul 9, 11:50 UTCJul 9, 12:45 UTC55m
2026-07-08 PFA259 - Jul 8, 23:45 UTCJul 9, 00:30 UTC45m
2026-07-08 PFA259 - Jul 8, 21:40 UTCJul 8, 22:10 UTC30m
2026-07-08 PFA259 - Jul 8, 19:40 UTCJul 8, 20:10 UTC30m
2026-07-08 PFA259 - Jul 8, 15:10 UTCJul 8, 16:50 UTC1h 40m
2026-07-08 PFA259 - Jul 8, 12:50 UTCJul 8, 13:40 UTC50m
2026-07-07 PFA259 - Jul 7, 17:45 UTCJul 7, 18:05 UTC20m
2026-06-30 PFA259 - Jun 30, 18:45 UTCJun 30, 19:00 UTC15m
2026-06-29 PFA259 VRB → VRB Jun 29, 21:44 UTCJun 29, 22:30 UTC45m
2026-06-26 N56686 VRB → VRB Jun 26, 20:00 UTCJun 26, 20:34 UTC35m
2026-06-25 N56686 - Jun 25, 15:54 UTCJun 25, 16:35 UTC40m
2026-06-25 N56686 - Jun 25, 00:40 UTCJun 25, 02:45 UTC2h 5m
2026-06-24 N56686 - Jun 24, 13:05 UTCJun 24, 13:44 UTC40m
2026-06-23 N56686 - Jun 23, 18:50 UTCJun 23, 19:29 UTC40m
2026-06-22 N56686 - Jun 22, 19:05 UTCJun 22, 21:14 UTC2h 10m
2026-06-22 N56686 - Jun 22, 14:40 UTCJun 22, 15:50 UTC1h 10m
2026-06-19 N56686 - Jun 19, 12:44 UTCJun 19, 13:44 UTC1h 0m
2026-06-19 N56686 VRB → VRB Jun 19, 00:34 UTCJun 19, 01:10 UTC35m
2026-06-18 N56686 - Jun 18, 21:30 UTCJun 18, 22:35 UTC1h 5m
2026-06-18 N56686 - Jun 18, 19:25 UTCJun 18, 20:35 UTC1h 10m
2026-06-17 N56686 - Jun 17, 17:05 UTCJun 17, 17:45 UTC40m
2026-06-17 N56686 - Jun 17, 13:15 UTCJun 17, 14:00 UTC45m
2026-06-16 N56686 - Jun 16, 18:55 UTCJun 16, 19:30 UTC35m
2026-06-16 N56686 - Jun 16, 11:45 UTCJun 16, 12:50 UTC1h 5m
2026-06-15 N56686 - Jun 15, 17:45 UTCJun 15, 18:55 UTC1h 10m
2026-06-15 N56686 - Jun 15, 15:00 UTCJun 15, 15:50 UTC50m
2026-06-12 N56686 - Jun 12, 15:25 UTCJun 12, 15:40 UTC15m
2026-06-11 N56686 - Jun 11, 18:10 UTCJun 11, 19:05 UTC55m
2026-06-11 N56686 - Jun 11, 15:55 UTCJun 11, 16:40 UTC45m
2026-06-09 N56686 - Jun 9, 19:15 UTCJun 9, 19:55 UTC40m
2026-06-09 N56686 - Jun 9, 00:40 UTCJun 9, 02:40 UTC2h 0m
2026-06-05 N56686 - Jun 5, 19:55 UTCJun 5, 20:45 UTC50m
2026-06-05 N56686 - Jun 5, 18:00 UTCJun 5, 18:45 UTC45m
2026-06-05 N56686 - Jun 5, 14:50 UTCJun 5, 16:05 UTC1h 15m
2026-06-04 N56686 - Jun 4, 23:45 UTCJun 5, 01:45 UTC2h 0m
2026-06-04 N56686 - Jun 4, 15:10 UTCJun 4, 16:25 UTC1h 15m
2026-06-04 N56686 - Jun 4, 01:00 UTCJun 4, 02:45 UTC1h 45m
2026-06-03 N56686 - Jun 3, 21:25 UTCJun 3, 22:30 UTC1h 5m
2026-06-02 N56686 - Jun 2, 21:40 UTCJun 2, 22:10 UTC30m

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 N56686 page for operator, model, and routing details .

Mode-S A740C3 frequently asked

What is Mode-S code A740C3?
A740C3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N56686.
Where is Mode-S A740C3 registered?
Mode-S code A740C3 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 A740C3 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A740C3, octal 51640303, decimal 10,961,091.
What flights does A740C3 operate?
Mode-S A740C3 has broadcast 2 distinct callsigns, including N56686, PFA259.