Apparatus

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sensors Mode-S transponder

A555F5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N443CA · TECNAM P-2012 Traveller · operated by HYANNIS AIR SERVICE INC

Hex
A555F5
Octal
51252765
Decimal
10,835,445
Country
US
Tail
N443CA
Type
P212
No current signal · last broadcast 6h ago
Flights observed
148
Distinct callsigns
8
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S A555F5.

Country allocation

The ICAO 24-bit address A555F5 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 8 distinct

Callsign Airline Flights Last seen
KAP5150 Cape Air 35 2026-05-28
KAP230 Cape Air 27 2026-04-21
KAP305 Cape Air 26 2026-05-29
KAP726 Cape Air 24 2026-05-19
KAP219 Cape Air 20 2026-05-03
KAP63 Cape Air 14 2026-05-12
KAP222 Cape Air 1 2026-05-12
KAP - 1 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 KAP305 ACK → HYA May 29, 22:00 UTCMay 29, 22:10 UTC10m
2026-05-29 KAP305 ACK → HYA May 29, 21:00 UTCMay 29, 21:10 UTC10m
2026-05-29 KAP305 ACK → HYA May 29, 19:25 UTCMay 29, 19:35 UTC10m
2026-05-29 KAP305 ACK → HYA May 29, 17:45 UTCMay 29, 17:55 UTC10m
2026-05-29 KAP305 ACK → HYA May 29, 14:20 UTCMay 29, 14:30 UTC10m
2026-05-29 KAP305 ACK → HYA May 29, 12:45 UTCMay 29, 12:55 UTC10m
2026-05-29 KAP305 ACK → HYA May 29, 11:55 UTCMay 29, 12:10 UTC15m
2026-05-28 KAP305 ACK → HYA May 28, 23:20 UTCMay 28, 23:30 UTC10m
2026-05-28 KAP305 ACK → HYA May 28, 20:55 UTCMay 28, 21:05 UTC10m
2026-05-28 KAP305 ACK → HYA May 28, 17:50 UTCMay 28, 18:00 UTC10m
2026-05-28 KAP5150 SJU → MAZ May 28, 15:55 UTCMay 28, 16:05 UTC10m
2026-05-28 KAP5150 SJU → MAZ May 28, 14:35 UTCMay 28, 14:45 UTC10m
2026-05-28 KAP5150 SJU → MAZ May 28, 13:00 UTCMay 28, 13:10 UTC10m
2026-05-27 KAP5150 SJU → MAZ May 27, 14:50 UTCMay 27, 15:00 UTC10m
2026-05-27 KAP5150 SJU → MAZ May 27, 13:20 UTCMay 27, 13:30 UTC10m
2026-05-27 KAP5150 SJU → MAZ May 27, 12:10 UTCMay 27, 12:20 UTC10m
2026-05-26 KAP5150 SJU → MAZ May 26, 23:25 UTCMay 26, 23:35 UTC10m
2026-05-26 KAP5150 SJU → MAZ May 26, 21:55 UTCMay 26, 22:05 UTC10m
2026-05-24 KAP305 ACK → HYA May 24, 21:40 UTCMay 24, 21:50 UTC10m
2026-05-24 KAP305 ACK → HYA May 24, 20:25 UTCMay 24, 20:35 UTC10m
2026-05-24 KAP305 ACK → HYA May 24, 15:50 UTCMay 24, 16:00 UTC10m
2026-05-24 KAP305 ACK → HYA May 24, 14:30 UTCMay 24, 14:40 UTC10m
2026-05-24 KAP305 ACK → HYA May 24, 11:50 UTCMay 24, 12:00 UTC10m
2026-05-23 KAP305 ACK → HYA May 23, 22:05 UTCMay 23, 22:15 UTC10m
2026-05-23 KAP305 ACK → HYA May 23, 21:05 UTCMay 23, 21:15 UTC10m
2026-05-23 KAP305 ACK → HYA May 23, 16:15 UTCMay 23, 16:30 UTC15m
2026-05-23 KAP305 ACK → HYA May 23, 15:10 UTCMay 23, 15:20 UTC10m
2026-05-22 KAP305 ACK → HYA May 22, 22:25 UTCMay 22, 22:35 UTC10m
2026-05-22 KAP305 ACK → HYA May 22, 21:25 UTCMay 22, 21:40 UTC15m
2026-05-22 KAP305 ACK → HYA May 22, 17:40 UTCMay 22, 17:50 UTC10m
2026-05-22 KAP305 ACK → HYA May 22, 16:00 UTCMay 22, 16:10 UTC10m
2026-05-22 KAP305 ACK → HYA May 22, 14:20 UTCMay 22, 14:30 UTC10m
2026-05-22 KAP305 ACK → HYA May 22, 12:05 UTCMay 22, 12:15 UTC10m
2026-05-21 KAP305 ACK → HYA May 21, 20:10 UTCMay 21, 20:20 UTC10m
2026-05-19 KAP726 SJU → STT May 19, 19:50 UTCMay 19, 20:00 UTC10m
2026-05-19 KAP726 SJU → STT May 19, 18:05 UTCMay 19, 18:20 UTC15m
2026-05-19 KAP726 SJU → STT May 19, 16:00 UTCMay 19, 16:10 UTC10m
2026-05-19 KAP726 SJU → STT May 19, 13:15 UTCMay 19, 13:30 UTC15m
2026-05-18 KAP726 SJU → STT May 18, 19:55 UTCMay 18, 20:15 UTC20m
2026-05-18 KAP726 SJU → STT May 18, 18:25 UTCMay 18, 18:40 UTC14m
2026-05-18 KAP726 SJU → STT May 18, 15:50 UTCMay 18, 16:05 UTC15m
2026-05-18 KAP726 SJU → STT May 18, 14:25 UTCMay 18, 14:40 UTC15m
2026-05-18 KAP726 SJU → STT May 18, 12:45 UTCMay 18, 13:00 UTC15m
2026-05-15 KAP726 SJU → STT May 15, 22:05 UTCMay 15, 22:25 UTC20m
2026-05-15 KAP726 SJU → STT May 15, 19:40 UTCMay 15, 19:55 UTC15m
2026-05-15 KAP726 SJU → STT May 15, 18:15 UTCMay 15, 18:30 UTC15m
2026-05-15 KAP726 SJU → STT May 15, 15:40 UTCMay 15, 16:05 UTC25m
2026-05-15 KAP726 SJU → STT May 15, 13:00 UTCMay 15, 13:20 UTC20m
2026-05-14 KAP726 SJU → STT May 14, 21:55 UTCMay 14, 22:10 UTC15m
2026-05-14 KAP726 SJU → STT May 14, 20:00 UTCMay 14, 20:10 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 N443CA page for operator, model, and routing details .

Mode-S A555F5 frequently asked

What is Mode-S code A555F5?
A555F5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N443CA.
Where is Mode-S A555F5 registered?
Mode-S code A555F5 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 A555F5 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A555F5, octal 51252765, decimal 10,835,445.
What flights does A555F5 operate?
Mode-S A555F5 has broadcast 8 distinct callsigns, including KAP5150, KAP230, KAP305, KAP726, KAP219.