Apparatus

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sensors Mode-S transponder

A661ED

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N510FA · CESSNA 172 Skyhawk · operated by ENDEAVOUR FLIGHT TRAINING INC

Hex
A661ED
Octal
51460755
Decimal
10,904,045
Country
US
Tail
N510FA
Type
C172
No current signal · last broadcast 22h ago
Flights observed
84
Distinct callsigns
1
Country
US
Last broadcast
22h ago

Last known position

Most recent position reported by Mode-S A661ED.

Country allocation

The ICAO 24-bit address A661ED 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
N510FA - 84 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N510FA - Jul 13, 17:50 UTCJul 13, 18:20 UTC30m
2026-07-12 N510FA - Jul 12, 23:05 UTCJul 13, 00:01 UTC55m
2026-07-12 N510FA - Jul 12, 19:25 UTCJul 12, 20:20 UTC55m
2026-07-08 N510FA - Jul 8, 18:15 UTCJul 8, 19:00 UTC45m
2026-07-08 N510FA - Jul 8, 15:00 UTCJul 8, 15:50 UTC50m
2026-07-05 N510FA - Jul 5, 01:35 UTCJul 5, 02:10 UTC35m
2026-07-04 N510FA - Jul 4, 12:50 UTCJul 4, 13:55 UTC1h 5m
2026-07-03 N510FA - Jul 3, 13:30 UTCJul 3, 14:30 UTC1h 0m
2026-06-29 N510FA - Jun 29, 21:44 UTCJun 29, 22:15 UTC30m
2026-06-22 N510FA - Jun 22, 14:29 UTCJun 22, 15:10 UTC40m
2026-06-20 N510FA OPF → OPF Jun 20, 16:29 UTCJun 20, 17:59 UTC1h 30m
2026-06-20 N510FA - Jun 20, 13:59 UTCJun 20, 15:04 UTC1h 5m
2026-06-19 N510FA - Jun 19, 14:54 UTCJun 19, 15:44 UTC50m
2026-06-19 N510FA - Jun 19, 13:24 UTCJun 19, 13:54 UTC30m
2026-06-18 N510FA - Jun 18, 18:15 UTCJun 18, 19:00 UTC45m
2026-06-17 N510FA - Jun 17, 23:00 UTCJun 17, 23:40 UTC40m
2026-06-15 N510FA - Jun 15, 14:10 UTCJun 15, 16:15 UTC2h 5m
2026-06-11 N510FA - Jun 11, 22:40 UTCJun 11, 23:45 UTC1h 5m
2026-06-11 N510FA - Jun 11, 17:55 UTCJun 11, 18:50 UTC55m
2026-06-11 N510FA - Jun 11, 15:25 UTCJun 11, 16:10 UTC45m
2026-06-11 N510FA - Jun 11, 13:00 UTCJun 11, 13:45 UTC45m
2026-06-10 N510FA OPF → OPF Jun 10, 20:20 UTCJun 10, 21:20 UTC1h 0m
2026-06-07 N510FA - Jun 7, 13:45 UTCJun 7, 14:35 UTC50m
2026-06-06 N510FA - Jun 6, 19:40 UTCJun 6, 20:25 UTC45m
2026-06-06 N510FA - Jun 6, 17:00 UTCJun 6, 18:39 UTC1h 40m
2026-06-06 N510FA - Jun 6, 15:10 UTCJun 6, 15:50 UTC40m
2026-06-06 N510FA - Jun 6, 12:45 UTCJun 6, 13:54 UTC1h 10m
2026-06-05 N510FA - Jun 5, 20:00 UTCJun 5, 21:05 UTC1h 5m
2026-06-05 N510FA - Jun 5, 18:15 UTCJun 5, 18:50 UTC35m
2026-06-03 N510FA - Jun 3, 15:15 UTCJun 3, 16:10 UTC55m
2026-06-02 N510FA - Jun 2, 17:45 UTCJun 2, 18:50 UTC1h 5m
2026-05-26 N510FA OPF → OPF May 26, 11:34 UTCMay 26, 12:10 UTC35m
2026-05-25 N510FA - May 25, 14:00 UTCMay 25, 14:35 UTC35m
2026-05-22 N510FA - May 22, 18:05 UTCMay 22, 19:00 UTC55m
2026-05-21 N510FA OPF → OPF May 21, 18:00 UTCMay 21, 18:25 UTC25m
2026-05-21 N510FA - May 21, 14:25 UTCMay 21, 15:15 UTC50m
2026-05-20 N510FA OPF → OPF May 20, 20:25 UTCMay 20, 21:15 UTC50m
2026-05-16 N510FA - May 16, 15:31 UTCMay 16, 16:05 UTC35m
2026-05-15 N510FA OPF → OPF May 15, 19:45 UTCMay 15, 20:20 UTC35m
2026-05-15 N510FA - May 15, 17:15 UTCMay 15, 18:10 UTC55m
2026-05-15 N510FA OPF → OPF May 15, 15:20 UTCMay 15, 16:10 UTC50m
2026-05-14 N510FA APF → OPF May 14, 16:50 UTCMay 14, 18:05 UTC1h 15m
2026-05-14 N510FA - May 14, 14:50 UTCMay 14, 16:00 UTC1h 10m
2026-05-14 N510FA - May 14, 00:45 UTCMay 14, 01:15 UTC30m
2026-05-13 N510FA - May 13, 22:40 UTCMay 13, 23:05 UTC25m
2026-05-13 N510FA - May 13, 13:35 UTCMay 13, 14:30 UTC55m
2026-05-12 N510FA OPF → OPF May 12, 14:45 UTCMay 12, 14:55 UTC10m
2026-05-12 N510FA OPF → OPF May 12, 13:40 UTCMay 12, 14:00 UTC20m
2026-05-11 N510FA - May 11, 17:50 UTCMay 11, 19:20 UTC1h 30m
2026-05-10 N510FA - May 10, 17:30 UTCMay 10, 18:39 UTC1h 10m

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 N510FA page for operator, model, and routing details .

Mode-S A661ED frequently asked

What is Mode-S code A661ED?
A661ED is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N510FA.
Where is Mode-S A661ED registered?
Mode-S code A661ED 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 A661ED broadcasting right now?
No active broadcast right now. Last signal was 22h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A661ED, octal 51460755, decimal 10,904,045.
What flights does A661ED operate?
Mode-S A661ED has broadcast 1 distinct callsign, including N510FA.