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sensors Mode-S transponder

A661F4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N510FH · operated by COCO AIRCRAFT INC

Hex
A661F4
Octal
51460764
Decimal
10,904,052
Country
US
Tail
N510FH
Type
P28A
No current signal · last broadcast 19h ago
Flights observed
113
Distinct callsigns
1
Country
US
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S A661F4.

Country allocation

The ICAO 24-bit address A661F4 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
N510FH - 113 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N510FH - Jul 13, 15:10 UTCJul 13, 15:20 UTC10m
2026-07-10 N510FH - Jul 10, 16:10 UTCJul 10, 16:45 UTC35m
2026-07-10 N510FH - Jul 10, 14:50 UTCJul 10, 15:30 UTC40m
2026-07-09 N510FH - Jul 9, 20:40 UTCJul 9, 21:55 UTC1h 15m
2026-07-09 N510FH COI → IMM Jul 9, 17:55 UTCJul 9, 20:05 UTC2h 10m
2026-07-09 N510FH - Jul 9, 15:30 UTCJul 9, 16:25 UTC55m
2026-07-09 N510FH - Jul 9, 12:30 UTCJul 9, 13:05 UTC35m
2026-07-08 N510FH COI → COI Jul 8, 18:30 UTCJul 8, 21:50 UTC3h 20m
2026-07-08 N510FH COI → COI Jul 8, 17:05 UTCJul 8, 17:45 UTC40m
2026-07-08 N510FH - Jul 8, 15:55 UTCJul 8, 16:25 UTC30m
2026-07-08 N510FH COI → COI Jul 8, 14:05 UTCJul 8, 14:50 UTC45m
2026-07-07 N510FH - Jul 7, 16:50 UTCJul 7, 17:40 UTC50m
2026-07-07 N510FH - Jul 7, 13:25 UTCJul 7, 14:15 UTC50m
2026-06-18 N510FH - Jun 18, 16:20 UTCJun 18, 17:15 UTC55m
2026-06-17 N510FH COI → COI Jun 17, 18:15 UTCJun 17, 21:35 UTC3h 20m
2026-06-17 N510FH - Jun 17, 14:50 UTCJun 17, 16:15 UTC1h 25m
2026-06-17 N510FH - Jun 17, 12:10 UTCJun 17, 13:35 UTC1h 25m
2026-06-16 N510FH COI → COI Jun 16, 18:09 UTCJun 16, 22:00 UTC3h 51m
2026-06-16 N510FH COI → COI Jun 16, 14:09 UTCJun 16, 14:35 UTC25m
2026-06-16 N510FH COI → COI Jun 16, 12:45 UTCJun 16, 13:19 UTC35m
2026-06-15 N510FH - Jun 15, 14:24 UTCJun 15, 15:59 UTC1h 35m
2026-06-15 N510FH - Jun 15, 12:10 UTCJun 15, 13:15 UTC1h 5m
2026-06-14 N510FH - Jun 14, 17:50 UTCJun 14, 20:55 UTC3h 5m
2026-06-14 N510FH - Jun 14, 12:00 UTCJun 14, 16:00 UTC4h 0m
2026-06-12 N510FH - Jun 12, 12:05 UTCJun 12, 16:00 UTC3h 55m
2026-06-11 N510FH - Jun 11, 12:00 UTCJun 11, 16:00 UTC4h 0m
2026-06-09 N510FH COI → COI Jun 9, 20:05 UTCJun 9, 20:20 UTC15m
2026-06-09 N510FH COI → COI Jun 9, 16:50 UTCJun 9, 19:00 UTC2h 10m
2026-06-09 N510FH - Jun 9, 12:35 UTCJun 9, 14:30 UTC1h 55m
2026-06-08 N510FH - Jun 8, 20:45 UTCJun 8, 22:05 UTC1h 20m
2026-06-08 N510FH - Jun 8, 18:05 UTCJun 8, 19:25 UTC1h 20m
2026-06-08 N510FH - Jun 8, 15:04 UTCJun 8, 16:10 UTC1h 5m
2026-06-08 N510FH - Jun 8, 12:10 UTCJun 8, 13:15 UTC1h 5m
2026-06-07 N510FH - Jun 7, 20:35 UTCJun 7, 22:05 UTC1h 30m
2026-06-07 N510FH - Jun 7, 18:05 UTCJun 7, 19:40 UTC1h 35m
2026-06-07 N510FH - Jun 7, 15:00 UTCJun 7, 16:05 UTC1h 5m
2026-06-07 N510FH - Jun 7, 12:30 UTCJun 7, 14:15 UTC1h 45m
2026-06-06 N510FH COI → COI Jun 6, 21:30 UTCJun 6, 22:30 UTC1h 0m
2026-06-06 N510FH - Jun 6, 18:19 UTCJun 6, 19:19 UTC1h 0m
2026-06-06 N510FH COI → COI Jun 6, 15:50 UTCJun 6, 16:34 UTC45m
2026-06-06 N510FH COI → COI Jun 6, 14:20 UTCJun 6, 15:05 UTC45m
2026-06-06 N510FH COI → COI Jun 6, 12:45 UTCJun 6, 13:34 UTC50m
2026-06-05 N510FH - Jun 5, 18:20 UTCJun 5, 21:20 UTC3h 0m
2026-06-05 N510FH - Jun 5, 14:00 UTCJun 5, 16:30 UTC2h 30m
2026-06-05 N510FH - Jun 5, 12:10 UTCJun 5, 13:10 UTC1h 0m
2026-06-04 N510FH - Jun 4, 20:45 UTCJun 4, 22:10 UTC1h 25m
2026-06-04 N510FH - Jun 4, 18:05 UTCJun 4, 19:35 UTC1h 30m
2026-06-04 N510FH - Jun 4, 14:35 UTCJun 4, 16:05 UTC1h 30m
2026-06-04 N510FH - Jun 4, 12:05 UTCJun 4, 13:40 UTC1h 35m
2026-06-01 N510FH - Jun 1, 14:55 UTCJun 1, 16:10 UTC1h 15m

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 N510FH page for operator, model, and routing details .

Mode-S A661F4 frequently asked

What is Mode-S code A661F4?
A661F4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N510FH.
Where is Mode-S A661F4 registered?
Mode-S code A661F4 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 A661F4 broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A661F4, octal 51460764, decimal 10,904,052.
What flights does A661F4 operate?
Mode-S A661F4 has broadcast 1 distinct callsign, including N510FH.