Apparatus

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sensors Mode-S transponder

A6D812

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N540BN · BRITTEN-NORMAN BN-2 Islander · operated by HYANNIS AIR SERVICE INC D/B/A, CAPE AIR

Hex
A6D812
Octal
51554022
Decimal
10,934,290
Country
US
Tail
N540BN
Type
BN2P
No current signal · last broadcast 1d ago
Flights observed
65
Distinct callsigns
11
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A6D812.

Country allocation

The ICAO 24-bit address A6D812 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 11 distinct

Callsign Airline Flights Last seen
KAP223B - 18 2026-07-03
KAP335B Cape Air 14 2026-07-13
KAP189B Cape Air 8 2026-06-26
KAP37B Cape Air 6 2026-07-07
KAP202B Cape Air 6 2026-07-04
KAP30B - 4 2026-07-06
KAP429B Cape Air 3 2026-05-11
KAP48B Cape Air 2 2026-05-06
KAP34B - 2 2026-06-30
KAP62B - 1 2026-06-30
KAP252B - 1 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 KAP335B SJU → STT Jul 13, 15:20 UTCJul 13, 15:35 UTC15m
2026-07-13 KAP335B SJU → STT Jul 13, 14:30 UTCJul 13, 14:45 UTC15m
2026-07-11 KAP335B SJU → STT Jul 11, 15:30 UTCJul 11, 15:55 UTC25m
2026-07-07 KAP37B STT → SBH Jul 7, 14:40 UTCJul 7, 14:50 UTC10m
2026-07-06 KAP30B - Jul 6, 18:40 UTCJul 6, 19:05 UTC25m
2026-07-06 KAP30B - Jul 6, 16:15 UTCJul 6, 17:50 UTC1h 35m
2026-07-04 KAP202B - Jul 4, 19:00 UTCJul 4, 19:20 UTC20m
2026-07-04 KAP202B - Jul 4, 17:40 UTCJul 4, 18:05 UTC25m
2026-07-04 KAP202B CPX → SJU Jul 4, 15:45 UTCJul 4, 15:55 UTC10m
2026-07-04 KAP202B CPX → SJU Jul 4, 15:00 UTCJul 4, 15:10 UTC10m
2026-07-04 KAP202B CPX → SJU Jul 4, 13:45 UTCJul 4, 14:00 UTC15m
2026-07-03 KAP223B - Jul 3, 20:40 UTCJul 3, 21:05 UTC25m
2026-07-03 KAP223B - Jul 3, 19:05 UTCJul 3, 19:20 UTC15m
2026-07-03 KAP223B - Jul 3, 17:05 UTCJul 3, 17:35 UTC30m
2026-07-03 KAP223B - Jul 3, 14:55 UTCJul 3, 15:10 UTC15m
2026-07-02 KAP223B - Jul 2, 20:40 UTCJul 2, 21:00 UTC20m
2026-07-02 KAP223B - Jul 2, 19:05 UTCJul 2, 19:20 UTC15m
2026-07-02 KAP223B - Jul 2, 17:20 UTCJul 2, 17:45 UTC25m
2026-07-02 KAP223B - Jul 2, 15:55 UTCJul 2, 16:20 UTC25m
2026-07-01 KAP223B - Jul 1, 20:40 UTCJul 1, 21:00 UTC20m
2026-06-30 KAP30B - Jun 30, 20:00 UTCJun 30, 20:15 UTC15m
2026-06-30 KAP30B - Jun 30, 19:05 UTCJun 30, 19:20 UTC15m
2026-06-30 KAP252B - Jun 30, 16:55 UTCJun 30, 17:25 UTC30m
2026-06-30 KAP34B - Jun 30, 15:10 UTCJun 30, 15:30 UTC20m
2026-06-30 KAP34B - Jun 30, 14:05 UTCJun 30, 14:30 UTC25m
2026-06-30 KAP62B - Jun 30, 12:00 UTCJun 30, 12:25 UTC25m
2026-06-26 KAP189B CPX → SJU Jun 26, 19:55 UTCJun 26, 20:15 UTC20m
2026-06-26 KAP189B CPX → SJU Jun 26, 11:45 UTCJun 26, 12:19 UTC35m
2026-06-22 KAP189B CPX → SJU Jun 22, 19:54 UTCJun 22, 20:10 UTC15m
2026-06-19 KAP335B SJU → STT Jun 19, 13:50 UTCJun 19, 14:09 UTC20m
2026-06-19 KAP335B SJU → STT Jun 19, 12:59 UTCJun 19, 13:14 UTC15m
2026-06-17 KAP37B STT → SBH Jun 17, 14:00 UTCJun 17, 14:20 UTC20m
2026-05-28 KAP37B STT → SBH May 28, 16:15 UTCMay 28, 16:30 UTC15m
2026-05-26 KAP202B CPX → SJU May 26, 11:20 UTCMay 26, 11:39 UTC20m
2026-05-24 KAP37B STT → SBH May 24, 19:10 UTCMay 24, 19:30 UTC20m
2026-05-24 KAP37B STT → SBH May 24, 14:10 UTCMay 24, 14:30 UTC20m
2026-05-23 KAP223B CPX → SJU May 23, 16:05 UTCMay 23, 16:20 UTC15m
2026-05-23 KAP223B CPX → SJU May 23, 14:05 UTCMay 23, 14:35 UTC30m
2026-05-23 KAP223B CPX → SJU May 23, 13:05 UTCMay 23, 13:15 UTC10m
2026-05-22 KAP223B CPX → SJU May 22, 20:05 UTCMay 22, 20:30 UTC25m
2026-05-22 KAP223B CPX → SJU May 22, 18:25 UTCMay 22, 19:15 UTC50m
2026-05-22 KAP223B CPX → SJU May 22, 16:20 UTCMay 22, 16:40 UTC20m
2026-05-22 KAP223B CPX → SJU May 22, 14:50 UTCMay 22, 15:10 UTC20m
2026-05-22 KAP223B CPX → SJU May 22, 13:20 UTCMay 22, 13:45 UTC25m
2026-05-21 KAP223B CPX → SJU May 21, 20:25 UTCMay 21, 20:45 UTC20m
2026-05-21 KAP189B CPX → SJU May 21, 19:00 UTCMay 21, 19:35 UTC35m
2026-05-16 KAP335B SJU → STT May 16, 16:15 UTCMay 16, 16:31 UTC15m
2026-05-16 KAP335B SJU → STT May 16, 15:10 UTCMay 16, 15:31 UTC20m
2026-05-13 KAP189B CPX → SJU May 13, 16:50 UTCMay 13, 17:10 UTC20m
2026-05-11 KAP429B SJU → CPX May 11, 14:35 UTCMay 11, 14:50 UTC15m

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 N540BN page for operator, model, and routing details .

Mode-S A6D812 frequently asked

What is Mode-S code A6D812?
A6D812 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N540BN.
Where is Mode-S A6D812 registered?
Mode-S code A6D812 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 A6D812 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6D812, octal 51554022, decimal 10,934,290.
What flights does A6D812 operate?
Mode-S A6D812 has broadcast 11 distinct callsigns, including KAP223B, KAP335B, KAP189B, KAP37B, KAP202B.