Apparatus

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sensors Mode-S transponder

A8F5EC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N677CA · CESSNA 402 Businessliner · operated by HYANNIS AIR SERVICE INC

Hex
A8F5EC
Octal
52172754
Decimal
11,073,004
Country
US
Tail
N677CA
Type
C402
No current signal · last broadcast 17h ago
Flights observed
97
Distinct callsigns
20
Country
US
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S A8F5EC.

Country allocation

The ICAO 24-bit address A8F5EC 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
KAP157 Cape Air 20 2026-05-15
KAP635 Cape Air 12 2026-05-16
KAP131 Cape Air 12 2026-05-25
KAP350 Cape Air 10 2026-05-27
KAP252 Cape Air 9 2026-04-19
KAP876 Cape Air 6 2026-05-28
KAP726 Cape Air 3 2026-04-20
KAP230 Cape Air 3 2026-04-17
KAP211 Cape Air 3 2026-04-13
KAP1903 Cape Air 3 2026-05-17
KAP7 Cape Air 2 2026-05-04
KAP64 Cape Air 2 2026-05-29
KAP63 Cape Air 2 2026-05-22
KAP2296 Cape Air 2 2026-05-06
KAP222 Cape Air 2 2026-05-21
KAP65 Cape Air 1 2026-04-14
KAP6151 Cape Air 1 2026-04-22
KAP5150 Cape Air 1 2026-04-13
KAP47 Cape Air 1 2026-05-23
KAP202 Cape Air 1 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 KAP64 STT → STX May 29, 13:50 UTCMay 29, 14:05 UTC15m
2026-05-29 KAP64 STT → STX May 29, 13:00 UTCMay 29, 13:15 UTC15m
2026-05-28 KAP876 SJU → STX May 28, 21:25 UTCMay 28, 21:45 UTC20m
2026-05-28 KAP876 SJU → STX May 28, 19:10 UTCMay 28, 19:30 UTC20m
2026-05-28 KAP876 SJU → STX May 28, 17:45 UTCMay 28, 17:55 UTC10m
2026-05-28 KAP876 SJU → STX May 28, 16:40 UTCMay 28, 16:55 UTC15m
2026-05-28 KAP876 SJU → STX May 28, 15:10 UTCMay 28, 15:30 UTC20m
2026-05-28 KAP876 SJU → STX May 28, 13:10 UTCMay 28, 13:25 UTC15m
2026-05-27 KAP350 STT → STX May 27, 17:25 UTCMay 27, 17:40 UTC15m
2026-05-27 KAP350 STT → STX May 27, 15:40 UTCMay 27, 15:50 UTC10m
2026-05-26 KAP350 STT → STX May 26, 21:09 UTCMay 26, 21:29 UTC20m
2026-05-26 KAP350 STT → STX May 26, 20:00 UTCMay 26, 20:15 UTC15m
2026-05-26 KAP350 STT → STX May 26, 18:19 UTCMay 26, 18:40 UTC20m
2026-05-26 KAP350 STT → STX May 26, 15:45 UTCMay 26, 15:54 UTC10m
2026-05-26 KAP350 STT → STX May 26, 15:00 UTCMay 26, 15:09 UTC10m
2026-05-26 KAP350 STT → STX May 26, 13:04 UTCMay 26, 13:19 UTC15m
2026-05-25 KAP131 STX → SJU May 25, 21:30 UTCMay 25, 21:45 UTC15m
2026-05-25 KAP131 STX → SJU May 25, 20:04 UTCMay 25, 20:19 UTC15m
2026-05-25 KAP131 STX → SJU May 25, 17:10 UTCMay 25, 17:20 UTC10m
2026-05-25 KAP131 STX → SJU May 25, 16:25 UTCMay 25, 16:40 UTC15m
2026-05-25 KAP131 STX → SJU May 25, 15:00 UTCMay 25, 15:10 UTC10m
2026-05-25 KAP131 STX → SJU May 25, 13:05 UTCMay 25, 13:15 UTC10m
2026-05-24 KAP131 STX → SJU May 24, 21:30 UTCMay 24, 21:45 UTC15m
2026-05-24 KAP131 STX → SJU May 24, 19:00 UTCMay 24, 19:20 UTC20m
2026-05-24 KAP131 STX → SJU May 24, 17:40 UTCMay 24, 17:50 UTC10m
2026-05-24 KAP131 STX → SJU May 24, 15:35 UTCMay 24, 15:55 UTC20m
2026-05-24 KAP131 STX → SJU May 24, 14:10 UTCMay 24, 14:20 UTC10m
2026-05-24 KAP131 STX → SJU May 24, 13:00 UTCMay 24, 13:15 UTC15m
2026-05-23 KAP350 STT → STX May 23, 19:50 UTCMay 23, 20:10 UTC20m
2026-05-23 KAP350 STT → STX May 23, 18:10 UTCMay 23, 18:25 UTC15m
2026-05-23 KAP47 STT → SJU May 23, 16:20 UTCMay 23, 16:30 UTC10m
2026-05-22 KAP63 BOS → RUT May 22, 19:00 UTCMay 22, 19:15 UTC15m
2026-05-22 KAP63 BOS → RUT May 22, 13:20 UTCMay 22, 13:40 UTC20m
2026-05-21 KAP222 SJU → VQS May 21, 18:30 UTCMay 21, 19:05 UTC35m
2026-05-21 KAP222 SJU → VQS May 21, 17:40 UTCMay 21, 17:55 UTC15m
2026-05-17 KAP1903 SJU → STT May 17, 17:25 UTCMay 17, 17:40 UTC15m
2026-05-17 KAP1903 SJU → STT May 17, 15:45 UTCMay 17, 15:55 UTC10m
2026-05-17 KAP1903 SJU → STT May 17, 14:01 UTCMay 17, 14:50 UTC50m
2026-05-16 KAP635 STT → SJU May 16, 21:15 UTCMay 16, 21:30 UTC15m
2026-05-16 KAP635 STT → SJU May 16, 19:20 UTCMay 16, 19:40 UTC20m
2026-05-16 KAP635 STT → SJU May 16, 17:10 UTCMay 16, 17:25 UTC15m
2026-05-16 KAP635 STT → SJU May 16, 15:55 UTCMay 16, 16:10 UTC15m
2026-05-16 KAP635 STT → SJU May 16, 13:41 UTCMay 16, 13:55 UTC15m
2026-05-16 KAP635 STT → SJU May 16, 12:16 UTCMay 16, 12:31 UTC15m
2026-05-15 KAP635 STT → SJU May 15, 19:40 UTCMay 15, 19:55 UTC15m
2026-05-15 KAP635 STT → SJU May 15, 17:15 UTCMay 15, 17:30 UTC15m
2026-05-15 KAP635 STT → SJU May 15, 16:35 UTCMay 15, 16:45 UTC10m
2026-05-15 KAP157 SJU → VQS May 15, 11:15 UTCMay 15, 11:25 UTC10m
2026-05-14 KAP157 SJU → VQS May 14, 19:50 UTCMay 14, 20:05 UTC15m
2026-05-14 KAP157 SJU → VQS May 14, 17:30 UTCMay 14, 17:40 UTC10m

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 N677CA page for operator, model, and routing details .

Mode-S A8F5EC frequently asked

What is Mode-S code A8F5EC?
A8F5EC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N677CA.
Where is Mode-S A8F5EC registered?
Mode-S code A8F5EC 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 A8F5EC broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8F5EC, octal 52172754, decimal 11,073,004.
What flights does A8F5EC operate?
Mode-S A8F5EC has broadcast 20 distinct callsigns, including KAP157, KAP635, KAP131, KAP350, KAP252.