Apparatus

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sensors Mode-S transponder

A8F51B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N6765T · CESSNA 402 Businessliner · operated by HYANNIS AIR SERVICE INC

Hex
A8F51B
Octal
52172433
Decimal
11,072,795
Country
US
Tail
N6765T
Type
C402
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
165
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A8F51B.

Country allocation

The ICAO 24-bit address A8F51B 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
KAP33 Cape Air 28 2026-05-01
KAP1271 Cape Air 24 2026-07-26
KAP811 - 7 2026-07-20
KAP328 Cape Air 7 2026-04-22
KAP250 - 7 2026-07-15
KAP203 Cape Air 7 2026-07-25
KAP78 Cape Air 6 2026-04-18
KAP6789 Cape Air 6 2026-04-27
KAP924 Cape Air 5 2026-07-22
KAP527 Cape Air 5 2026-07-22
KAP42 Cape Air 5 2026-05-12
KAP321 Cape Air 5 2026-05-17
KAP519 Cape Air 4 2026-07-25
KAP296 Cape Air 4 2026-07-24
KAP155 Cape Air 4 2026-07-18
KAP5241 Cape Air 3 2026-04-18
KAP5041 - 3 2026-07-14
KAP22 - 3 2026-07-12
KAP210 Cape Air 3 2026-05-16
KAP818 Cape Air 2 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAP1271 HYA → ACK Jul 26, 21:00 UTCJul 26, 21:30 UTC30m
2026-07-26 KAP1271 HYA → ACK Jul 26, 19:25 UTCJul 26, 20:00 UTC35m
2026-07-26 KAP1271 HYA → ACK Jul 26, 18:10 UTCJul 26, 18:40 UTC30m
2026-07-25 KAP203 BOS → BHB Jul 25, 20:40 UTCJul 25, 21:00 UTC20m
2026-07-25 KAP203 BOS → BHB Jul 25, 17:15 UTCJul 25, 18:10 UTC55m
2026-07-25 KAP203 BOS → BHB Jul 25, 14:50 UTCJul 25, 15:45 UTC55m
2026-07-25 KAP203 BOS → BHB Jul 25, 13:10 UTCJul 25, 14:05 UTC55m
2026-07-25 KAP203 BOS → BHB Jul 25, 11:00 UTCJul 25, 11:55 UTC55m
2026-07-25 KAP519 BOS → ALB Jul 25, 01:30 UTCJul 25, 02:00 UTC30m
2026-07-25 KAP519 BOS → ALB Jul 25, 00:00 UTCJul 25, 00:35 UTC35m
2026-07-24 KAP519 BOS → ALB Jul 24, 22:10 UTCJul 24, 22:45 UTC35m
2026-07-24 KAP519 BOS → ALB Jul 24, 20:25 UTCJul 24, 20:50 UTC25m
2026-07-24 KAP296 BOS → HYA Jul 24, 17:20 UTCJul 24, 17:35 UTC15m
2026-07-24 KAP296 BOS → HYA Jul 24, 16:15 UTCJul 24, 16:45 UTC30m
2026-07-24 KAP3001 MVY → BOS Jul 24, 15:00 UTCJul 24, 15:30 UTC30m
2026-07-24 KAP296 BOS → HYA Jul 24, 13:45 UTCJul 24, 14:10 UTC25m
2026-07-24 KAP3101 - Jul 24, 11:30 UTCJul 24, 12:35 UTC1h 5m
2026-07-24 KAP296 BOS → HYA Jul 24, 09:45 UTCJul 24, 09:55 UTC10m
2026-07-23 KAP818 RKD → BOS Jul 23, 21:05 UTCJul 23, 21:15 UTC10m
2026-07-23 KAP818 RKD → BOS Jul 23, 18:40 UTCJul 23, 20:20 UTC1h 40m
2026-07-22 KAP527 BOS → BHB Jul 22, 19:25 UTCJul 22, 19:55 UTC30m
2026-07-22 KAP527 BOS → BHB Jul 22, 17:25 UTCJul 22, 18:45 UTC1h 20m
2026-07-22 KAP3241 MVY → BOS Jul 22, 16:00 UTCJul 22, 16:35 UTC35m
2026-07-22 KAP527 BOS → BHB Jul 22, 14:45 UTCJul 22, 15:15 UTC30m
2026-07-22 KAP3221 MVY → BOS Jul 22, 12:30 UTCJul 22, 13:50 UTC1h 20m
2026-07-22 KAP924 STL → TBN Jul 22, 11:15 UTCJul 22, 11:40 UTC25m
2026-07-20 KAP811 - Jul 20, 23:10 UTCJul 20, 23:20 UTC10m
2026-07-20 KAP811 - Jul 20, 21:40 UTCJul 20, 21:50 UTC10m
2026-07-20 KAP811 - Jul 20, 18:10 UTCJul 20, 19:05 UTC55m
2026-07-20 KAP811 - Jul 20, 15:10 UTCJul 20, 16:40 UTC1h 30m
2026-07-20 KAP811 - Jul 20, 13:20 UTCJul 20, 13:45 UTC25m
2026-07-20 KAP811 - Jul 20, 12:20 UTCJul 20, 12:45 UTC25m
2026-07-20 KAP811 - Jul 20, 11:25 UTCJul 20, 11:35 UTC10m
2026-07-20 KAP1271 HYA → ACK Jul 20, 01:10 UTCJul 20, 01:35 UTC25m
2026-07-20 KAP1271 HYA → ACK Jul 20, 00:00 UTCJul 20, 00:25 UTC25m
2026-07-19 KAP1271 HYA → ACK Jul 19, 22:40 UTCJul 19, 23:05 UTC25m
2026-07-19 KAP1271 HYA → ACK Jul 19, 20:30 UTCJul 19, 21:40 UTC1h 10m
2026-07-19 KAP1271 HYA → ACK Jul 19, 18:55 UTCJul 19, 19:20 UTC25m
2026-07-19 KAP924 STL → TBN Jul 19, 15:55 UTCJul 19, 16:20 UTC25m
2026-07-19 KAP924 STL → TBN Jul 19, 14:40 UTCJul 19, 15:00 UTC20m
2026-07-19 KAP924 STL → TBN Jul 19, 13:20 UTCJul 19, 13:45 UTC25m
2026-07-19 KAP924 STL → TBN Jul 19, 10:40 UTCJul 19, 12:45 UTC2h 5m
2026-07-18 KAP155 BOS → BHB Jul 18, 21:10 UTCJul 18, 21:35 UTC25m
2026-07-18 KAP15 PVC → BOS Jul 18, 10:55 UTCJul 18, 11:30 UTC35m
2026-07-18 KAP6103 BOS → PVC Jul 18, 00:39 UTCJul 18, 00:55 UTC15m
2026-07-17 KAP6103 - Jul 17, 22:35 UTCJul 17, 22:49 UTC15m
2026-07-17 KAP516 BOS → AUG Jul 17, 21:50 UTCJul 17, 22:10 UTC20m
2026-07-17 KAP2141 - Jul 17, 18:50 UTCJul 17, 19:40 UTC50m
2026-07-17 KAP123 BOS → HYA Jul 17, 15:15 UTCJul 17, 15:25 UTC10m
2026-07-15 KAP27 MVY → BOS Jul 15, 17:05 UTCJul 15, 17:25 UTC20m

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 N6765T page for operator, model, and routing details .

Mode-S A8F51B frequently asked

What is Mode-S code A8F51B?
A8F51B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N6765T.
Where is Mode-S A8F51B registered?
Mode-S code A8F51B 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 A8F51B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8F51B, octal 52172433, decimal 11,072,795.
What flights does A8F51B operate?
Mode-S A8F51B has broadcast 20 distinct callsigns, including KAP33, KAP1271, KAP811, KAP328, KAP250.