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sensors Mode-S transponder

A91A9A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N686MF · operated by AUSTIN LU

Hex
A91A9A
Octal
52215232
Decimal
11,082,394
Country
US
Tail
N686MF
Broadcasting now · callsign N686MF · 225 ft
Flights observed
66
Distinct callsigns
1
Country
US
Last broadcast
49m ago

Current position

A91A9A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A91A9A 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
N686MF - 66 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 N686MF - Jul 10, 21:50 UTCJul 10, 22:30 UTC40m
2026-07-10 N686MF ORL → ORL Jul 10, 13:15 UTCJul 10, 14:55 UTC1h 40m
2026-07-09 N686MF ORL → ORL Jul 9, 22:15 UTCJul 10, 00:15 UTC2h 0m
2026-07-09 N686MF - Jul 9, 17:05 UTCJul 9, 18:50 UTC1h 45m
2026-07-09 N686MF - Jul 9, 12:45 UTCJul 9, 14:50 UTC2h 5m
2026-07-08 N686MF ORL → ORL Jul 8, 22:00 UTCJul 8, 22:35 UTC35m
2026-07-07 N686MF ORL → ORL Jul 7, 20:50 UTCJul 7, 23:45 UTC2h 55m
2026-07-07 N686MF ORL → ORL Jul 7, 13:45 UTCJul 7, 14:35 UTC50m
2026-07-07 N686MF - Jul 7, 13:25 UTCJul 7, 13:35 UTC10m
2026-07-07 N686MF - Jul 7, 12:55 UTCJul 7, 13:05 UTC10m
2026-07-06 N686MF ORL → ORL Jul 6, 17:55 UTCJul 6, 19:05 UTC1h 10m
2026-07-06 N686MF - Jul 6, 15:55 UTCJul 6, 16:40 UTC45m
2026-07-06 N686MF - Jul 6, 15:35 UTCJul 6, 15:50 UTC15m
2026-07-06 N686MF ORL → ORL Jul 6, 15:05 UTCJul 6, 15:15 UTC10m
2026-07-05 N686MF - Jul 5, 16:40 UTCJul 5, 18:05 UTC1h 25m
2026-07-05 N686MF - Jul 5, 13:50 UTCJul 5, 15:15 UTC1h 25m
2026-07-04 N686MF - Jul 4, 18:10 UTCJul 4, 19:00 UTC50m
2026-07-04 N686MF - Jul 4, 16:50 UTCJul 4, 17:40 UTC50m
2026-07-03 N686MF - Jul 3, 14:35 UTCJul 3, 15:00 UTC25m
2026-07-03 N686MF - Jul 3, 13:35 UTCJul 3, 14:00 UTC25m
2026-07-03 N686MF ORL → ORL Jul 3, 13:20 UTCJul 3, 13:30 UTC10m
2026-07-03 N686MF ORL → ORL Jul 3, 12:55 UTCJul 3, 13:00 UTC5m
2026-07-02 N686MF ORL → ORL Jul 2, 21:45 UTCJul 2, 23:40 UTC1h 55m
2026-07-01 N686MF ORL → ORL Jul 1, 16:45 UTCJul 1, 18:20 UTC1h 35m
2026-07-01 N686MF ORL → ORL Jul 1, 12:45 UTCJul 1, 14:00 UTC1h 15m
2026-06-30 N686MF - Jun 30, 16:25 UTCJun 30, 17:00 UTC35m
2026-06-30 N686MF - Jun 30, 14:50 UTCJun 30, 15:20 UTC30m
2026-06-30 N686MF ORL → ORL Jun 30, 00:14 UTCJun 30, 00:39 UTC25m
2026-06-29 N686MF - Jun 29, 15:30 UTCJun 29, 16:59 UTC1h 30m
2026-06-28 N686MF ORL → ORL Jun 28, 18:44 UTCJun 28, 20:19 UTC1h 35m
2026-06-28 N686MF ORL → ORL Jun 28, 12:35 UTCJun 28, 14:30 UTC1h 55m
2026-06-27 N686MF ORL → ORL Jun 27, 15:05 UTCJun 27, 16:14 UTC1h 10m
2026-06-27 N686MF ORL → ORL Jun 27, 11:59 UTCJun 27, 14:00 UTC2h 0m
2026-06-26 N686MF ORL → ORL Jun 26, 18:54 UTCJun 26, 20:10 UTC1h 15m
2026-06-26 N686MF - Jun 26, 15:15 UTCJun 26, 15:54 UTC40m
2026-06-26 N686MF - Jun 26, 13:55 UTCJun 26, 14:39 UTC45m
2026-06-25 N686MF ORL → ORL Jun 25, 00:40 UTCJun 25, 03:15 UTC2h 35m
2026-06-24 N686MF - Jun 24, 21:04 UTCJun 24, 22:35 UTC1h 30m
2026-06-24 N686MF - Jun 24, 15:05 UTCJun 24, 15:49 UTC45m
2026-06-23 N686MF - Jun 23, 16:50 UTCJun 23, 17:54 UTC1h 5m
2026-06-23 N686MF ORL → ORL Jun 23, 13:00 UTCJun 23, 14:10 UTC1h 10m
2026-06-22 N686MF ORL → ORL Jun 22, 17:55 UTCJun 22, 19:49 UTC1h 55m
2026-06-22 N686MF ORL → ORL Jun 22, 13:49 UTCJun 22, 15:05 UTC1h 15m
2026-06-21 N686MF ORL → ORL Jun 21, 12:49 UTCJun 21, 14:10 UTC1h 20m
2026-06-20 N686MF ORL → ORL Jun 20, 11:49 UTCJun 20, 13:55 UTC2h 5m
2026-06-19 N686MF - Jun 19, 15:24 UTCJun 19, 17:39 UTC2h 15m
2026-06-19 N686MF - Jun 19, 14:59 UTCJun 19, 15:19 UTC20m
2026-06-19 N686MF ORL → ORL Jun 19, 11:39 UTCJun 19, 12:14 UTC35m
2026-06-18 N686MF - Jun 18, 20:40 UTCJun 18, 22:50 UTC2h 10m
2026-06-18 N686MF ORL → ORL Jun 18, 16:50 UTCJun 18, 18:05 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 N686MF page for operator, model, and routing details .

Mode-S A91A9A frequently asked

What is Mode-S code A91A9A?
A91A9A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N686MF.
Where is Mode-S A91A9A registered?
Mode-S code A91A9A 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 A91A9A broadcasting right now?
Yes. Mode-S A91A9A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A91A9A, octal 52215232, decimal 11,082,394.
What flights does A91A9A operate?
Mode-S A91A9A has broadcast 1 distinct callsign, including N686MF.