Apparatus

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sensors Mode-S transponder

A8BF5F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N663AA · CESSNA 402 Businessliner · operated by HYANNIS AIR SERVICE INC

Hex
A8BF5F
Octal
52137537
Decimal
11,059,039
Country
US
Tail
N663AA
Type
C402
No current signal · last broadcast Jul 24, 19:40 UTC
Flights observed
251
Distinct callsigns
20
Country
US
Last broadcast
Jul 24, 19:40 UTC

Last known position

Most recent position reported by Mode-S A8BF5F.

Country allocation

The ICAO 24-bit address A8BF5F 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 20 distinct

Callsign Airline Flights Last seen
KAP916 - 15 2026-07-20
KAP6 - 11 2026-06-20
KAP27 Cape Air 11 2026-07-21
KAP818 - 10 2026-07-23
KAP548 Cape Air 9 2026-04-18
KAP155 - 9 2026-06-19
KAP110 Cape Air 9 2026-05-22
KAP98 - 8 2026-07-01
KAP763 Cape Air 8 2026-05-27
KAP3285 Cape Air 7 2026-07-23
KAP328 Cape Air 7 2026-07-18
KAP219 - 7 2026-06-14
KAP8380 Cape Air 6 2026-05-24
KAP811 - 6 2026-06-22
KAP747 Cape Air 6 2026-06-12
KAP85 Cape Air 5 2026-05-18
KAP7 Cape Air 5 2026-06-05
KAP527 Cape Air 5 2026-07-24
KAP78 - 4 2026-06-21
KAP452 Cape Air 4 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 KAP527 BOS → BHB Jul 24, 19:20 UTCJul 24, 19:40 UTC20m
2026-07-24 KAP527 BOS → BHB Jul 24, 18:35 UTCJul 24, 18:45 UTC10m
2026-07-24 KAP527 BOS → BHB Jul 24, 17:35 UTCJul 24, 18:00 UTC25m
2026-07-24 KAP3241 MVY → BOS Jul 24, 16:05 UTCJul 24, 16:35 UTC30m
2026-07-24 KAP527 BOS → BHB Jul 24, 14:05 UTCJul 24, 14:30 UTC25m
2026-07-24 KAP3221 MVY → BOS Jul 24, 12:45 UTCJul 24, 13:10 UTC25m
2026-07-24 KAP527 BOS → BHB Jul 24, 11:15 UTCJul 24, 12:00 UTC45m
2026-07-23 KAP3285 MVY → BOS Jul 23, 17:50 UTCJul 23, 19:00 UTC1h 10m
2026-07-23 KAP3285 MVY → BOS Jul 23, 16:00 UTCJul 23, 17:15 UTC1h 15m
2026-07-23 KAP3285 MVY → BOS Jul 23, 14:20 UTCJul 23, 14:45 UTC25m
2026-07-23 KAP818 - Jul 23, 11:50 UTCJul 23, 12:05 UTC15m
2026-07-21 KAP27 MVY → BOS Jul 21, 16:20 UTCJul 21, 16:30 UTC10m
2026-07-21 KAP27 MVY → BOS Jul 21, 15:10 UTCJul 21, 15:45 UTC35m
2026-07-21 KAP27 MVY → BOS Jul 21, 13:50 UTCJul 21, 14:15 UTC25m
2026-07-21 KAP27 MVY → BOS Jul 21, 11:25 UTCJul 21, 12:05 UTC40m
2026-07-20 KAP916 - Jul 20, 16:50 UTCJul 20, 17:20 UTC30m
2026-07-20 KAP916 - Jul 20, 15:35 UTCJul 20, 16:10 UTC35m
2026-07-20 KAP916 - Jul 20, 14:00 UTCJul 20, 14:30 UTC30m
2026-07-20 KAP916 - Jul 20, 12:30 UTCJul 20, 13:05 UTC35m
2026-07-20 KAP916 - Jul 20, 11:30 UTCJul 20, 11:40 UTC10m
2026-07-19 KAP87 STT → STX Jul 19, 23:45 UTCJul 20, 00:05 UTC20m
2026-07-19 KAP1840 - Jul 19, 21:35 UTCJul 19, 22:55 UTC1h 20m
2026-07-19 KAP87 STT → STX Jul 19, 17:00 UTCJul 19, 18:10 UTC1h 10m
2026-07-18 KAP1034 SLK → BOS Jul 18, 19:50 UTCJul 18, 20:50 UTC1h 0m
2026-07-18 KAP1029 - Jul 18, 15:55 UTCJul 18, 17:20 UTC1h 25m
2026-07-18 KAP6186 - Jul 18, 14:35 UTCJul 18, 15:00 UTC25m
2026-07-18 KAP328 BOS → BHB Jul 18, 02:19 UTCJul 18, 02:35 UTC15m
2026-07-18 KAP328 BOS → BHB Jul 18, 01:10 UTCJul 18, 01:39 UTC30m
2026-07-17 KAP5361 ACK → BOS Jul 17, 23:25 UTCJul 17, 23:55 UTC30m
2026-07-17 KAP328 BOS → BHB Jul 17, 22:00 UTCJul 17, 22:29 UTC30m
2026-07-17 KAP5261 - Jul 17, 20:10 UTCJul 17, 20:44 UTC35m
2026-07-17 KAP328 - Jul 17, 18:55 UTCJul 17, 19:25 UTC30m
2026-07-17 KAP7021 - Jul 17, 17:44 UTCJul 17, 18:05 UTC20m
2026-07-16 KAPT87 - Jul 16, 16:40 UTCJul 16, 18:19 UTC1h 40m
2026-07-16 KAP27 MVY → BOS Jul 16, 12:40 UTCJul 16, 14:10 UTC1h 30m
2026-07-15 KAPT516 - Jul 15, 13:25 UTCJul 15, 15:20 UTC1h 55m
2026-07-14 KAP916 - Jul 14, 17:45 UTCJul 14, 18:50 UTC1h 5m
2026-07-14 KAP916 - Jul 14, 16:15 UTCJul 14, 17:15 UTC1h 0m
2026-07-14 KAP916 - Jul 14, 14:40 UTCJul 14, 15:40 UTC1h 0m
2026-07-14 KAP916 - Jul 14, 12:35 UTCJul 14, 13:40 UTC1h 5m
2026-07-13 KAP27 MVY → BOS Jul 13, 17:45 UTCJul 13, 18:10 UTC25m
2026-07-13 KAP27 MVY → BOS Jul 13, 16:25 UTCJul 13, 16:50 UTC25m
2026-07-13 KAP27 MVY → BOS Jul 13, 15:20 UTCJul 13, 15:50 UTC30m
2026-07-13 KAP27 MVY → BOS Jul 13, 14:05 UTCJul 13, 14:35 UTC30m
2026-07-13 KAP27 MVY → BOS Jul 13, 12:25 UTCJul 13, 12:55 UTC30m
2026-07-13 KAP27 MVY → BOS Jul 13, 10:25 UTCJul 13, 11:30 UTC1h 5m
2026-07-12 KAP3285 - Jul 12, 23:10 UTCJul 12, 23:30 UTC20m
2026-07-12 KAP3285 - Jul 12, 22:00 UTCJul 12, 22:30 UTC30m
2026-07-12 KAP3285 - Jul 12, 19:40 UTCJul 12, 21:15 UTC1h 35m
2026-07-12 KAP3285 - Jul 12, 16:20 UTCJul 12, 17:55 UTC1h 35m

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 N663AA page for operator, model, and routing details .

Mode-S A8BF5F frequently asked

What is Mode-S code A8BF5F?
A8BF5F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N663AA.
Where is Mode-S A8BF5F registered?
Mode-S code A8BF5F 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 A8BF5F broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 19:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8BF5F, octal 52137537, decimal 11,059,039.
What flights does A8BF5F operate?
Mode-S A8BF5F has broadcast 20 distinct callsigns, including KAP916, KAP6, KAP27, KAP818, KAP548.