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 Jul 26, 19:15 UTC
Flights observed
112
Distinct callsigns
12
Country
US
Last broadcast
Jul 26, 19:15 UTC

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 12 distinct

Callsign Airline Flights Last seen
KAP223B - 18 2026-07-03
KAP202B - 17 2026-07-26
KAP8B - 14 2026-07-25
KAP48B Cape Air 14 2026-07-22
KAP335B Cape Air 14 2026-07-13
KAP189B Cape Air 8 2026-06-26
KAP429B Cape Air 7 2026-07-25
KAP37B Cape Air 6 2026-07-07
KAP252B - 6 2026-07-23
KAP30B - 5 2026-07-15
KAP34B - 2 2026-06-30
KAP62B - 1 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAP202B - Jul 26, 19:05 UTCJul 26, 19:15 UTC10m
2026-07-26 KAP202B - Jul 26, 17:20 UTCJul 26, 18:05 UTC45m
2026-07-26 KAP202B - Jul 26, 16:20 UTCJul 26, 16:35 UTC15m
2026-07-26 KAP202B - Jul 26, 14:35 UTCJul 26, 14:45 UTC10m
2026-07-26 KAP202B - Jul 26, 13:40 UTCJul 26, 13:55 UTC15m
2026-07-25 KAP429B SJU → CPX Jul 25, 21:40 UTCJul 25, 21:55 UTC15m
2026-07-25 KAP429B SJU → CPX Jul 25, 20:35 UTCJul 25, 20:50 UTC15m
2026-07-25 KAP8B - Jul 25, 19:15 UTCJul 25, 19:35 UTC20m
2026-07-25 KAP8B - Jul 25, 18:20 UTCJul 25, 18:30 UTC10m
2026-07-25 KAP8B - Jul 25, 17:20 UTCJul 25, 17:35 UTC15m
2026-07-25 KAP8B - Jul 25, 16:30 UTCJul 25, 16:45 UTC15m
2026-07-25 KAP8B - Jul 25, 14:55 UTCJul 25, 15:10 UTC15m
2026-07-25 KAP8B - Jul 25, 14:10 UTCJul 25, 14:25 UTC15m
2026-07-24 KAP8B - Jul 24, 21:45 UTCJul 24, 22:05 UTC20m
2026-07-24 KAP8B - Jul 24, 20:55 UTCJul 24, 21:10 UTC15m
2026-07-24 KAP8B - Jul 24, 17:20 UTCJul 24, 17:35 UTC15m
2026-07-24 KAP8B - Jul 24, 16:30 UTCJul 24, 16:45 UTC15m
2026-07-24 KAP8B - Jul 24, 15:00 UTCJul 24, 15:15 UTC15m
2026-07-24 KAP8B - Jul 24, 14:10 UTCJul 24, 14:30 UTC20m
2026-07-23 KAP8B - Jul 23, 21:45 UTCJul 23, 23:15 UTC1h 30m
2026-07-23 KAP8B - Jul 23, 20:55 UTCJul 23, 21:10 UTC15m
2026-07-23 KAP252B - Jul 23, 18:50 UTCJul 23, 19:05 UTC15m
2026-07-23 KAP252B - Jul 23, 16:20 UTCJul 23, 16:35 UTC15m
2026-07-23 KAP252B - Jul 23, 14:05 UTCJul 23, 15:00 UTC55m
2026-07-22 KAP48B SJU → CPX Jul 22, 21:50 UTCJul 22, 22:10 UTC20m
2026-07-22 KAP48B SJU → CPX Jul 22, 20:40 UTCJul 22, 21:00 UTC20m
2026-07-22 KAP48B SJU → CPX Jul 22, 18:45 UTCJul 22, 19:10 UTC25m
2026-07-22 KAP48B SJU → CPX Jul 22, 16:55 UTCJul 22, 17:25 UTC30m
2026-07-22 KAP48B SJU → CPX Jul 22, 14:45 UTCJul 22, 15:10 UTC25m
2026-07-22 KAP48B SJU → CPX Jul 22, 13:45 UTCJul 22, 14:05 UTC20m
2026-07-21 KAP48B SJU → CPX Jul 21, 23:50 UTCJul 22, 00:10 UTC20m
2026-07-21 KAP48B SJU → CPX Jul 21, 20:20 UTCJul 21, 20:45 UTC25m
2026-07-21 KAP48B SJU → CPX Jul 21, 19:20 UTCJul 21, 19:40 UTC20m
2026-07-21 KAP48B SJU → CPX Jul 21, 16:20 UTCJul 21, 16:40 UTC20m
2026-07-21 KAP48B SJU → CPX Jul 21, 14:45 UTCJul 21, 15:05 UTC20m
2026-07-21 KAP48B SJU → CPX Jul 21, 13:45 UTCJul 21, 14:00 UTC15m
2026-07-20 KAP429B SJU → CPX Jul 20, 22:00 UTCJul 20, 22:20 UTC20m
2026-07-20 KAP429B SJU → CPX Jul 20, 21:10 UTCJul 20, 21:30 UTC20m
2026-07-19 KAP202B - Jul 19, 20:35 UTCJul 19, 20:50 UTC15m
2026-07-19 KAP202B - Jul 19, 16:35 UTCJul 19, 16:55 UTC20m
2026-07-19 KAP202B - Jul 19, 15:00 UTCJul 19, 15:10 UTC10m
2026-07-19 KAP202B - Jul 19, 14:05 UTCJul 19, 14:25 UTC20m
2026-07-18 KAP202B - Jul 18, 21:40 UTCJul 18, 21:50 UTC10m
2026-07-18 KAP202B - Jul 18, 13:55 UTCJul 18, 14:15 UTC20m
2026-07-15 KAP30B - Jul 15, 15:45 UTCJul 15, 17:35 UTC1h 50m
2026-07-15 KAP252B - Jul 15, 13:25 UTCJul 15, 13:45 UTC20m
2026-07-15 KAP252B - Jul 15, 11:40 UTCJul 15, 12:35 UTC55m
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

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 Jul 26, 19:15 UTC.
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 12 distinct callsigns, including KAP223B, KAP202B, KAP8B, KAP48B, KAP335B.