Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 23, 13:45 UTC
Flights observed
304
Distinct callsigns
11
Country
US
Last broadcast
Jul 23, 13:45 UTC

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 11 distinct

Callsign Airline Flights Last seen
KAP230 - 67 2026-07-06
KAP305 - 63 2026-07-15
KAP5150 - 61 2026-07-15
KAP63 - 33 2026-07-17
KAP726 Cape Air 25 2026-06-03
KAP219 Cape Air 20 2026-05-03
KAP80 - 17 2026-07-20
KAP505 Cape Air 9 2026-06-14
KAP222 - 7 2026-07-07
KAP1 - 1 2026-07-23
KAP - 1 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 KAP1 - Jul 23, 13:30 UTCJul 23, 13:45 UTC15m
2026-07-20 KAP80 - Jul 20, 16:45 UTCJul 20, 16:55 UTC10m
2026-07-20 KAP80 - Jul 20, 14:00 UTCJul 20, 14:15 UTC15m
2026-07-20 KAP80 - Jul 20, 13:20 UTCJul 20, 13:30 UTC10m
2026-07-19 KAP80 - Jul 19, 22:30 UTCJul 19, 22:40 UTC10m
2026-07-19 KAP80 - Jul 19, 21:35 UTCJul 19, 21:45 UTC10m
2026-07-19 KAP80 - Jul 19, 20:50 UTCJul 19, 21:00 UTC10m
2026-07-19 KAP80 - Jul 19, 19:10 UTCJul 19, 19:20 UTC10m
2026-07-19 KAP80 - Jul 19, 15:55 UTCJul 19, 16:10 UTC15m
2026-07-19 KAP80 - Jul 19, 14:35 UTCJul 19, 14:50 UTC15m
2026-07-19 KAP80 - Jul 19, 13:50 UTCJul 19, 14:00 UTC10m
2026-07-19 KAP80 - Jul 19, 13:05 UTCJul 19, 13:15 UTC10m
2026-07-18 KAP80 - Jul 18, 22:25 UTCJul 18, 22:35 UTC10m
2026-07-18 KAP80 - Jul 18, 21:30 UTCJul 18, 21:40 UTC10m
2026-07-18 KAP80 - Jul 18, 19:05 UTCJul 18, 19:15 UTC10m
2026-07-18 KAP80 - Jul 18, 17:40 UTCJul 18, 17:50 UTC10m
2026-07-18 KAP80 - Jul 18, 16:25 UTCJul 18, 16:35 UTC10m
2026-07-18 KAP80 - Jul 18, 15:35 UTCJul 18, 15:45 UTC10m
2026-07-17 KAP63 - Jul 17, 20:29 UTCJul 17, 21:15 UTC45m
2026-07-17 KAP63 - Jul 17, 18:55 UTCJul 17, 19:40 UTC45m
2026-07-17 KAP63 - Jul 17, 17:20 UTCJul 17, 17:35 UTC15m
2026-07-17 KAP63 - Jul 17, 16:04 UTCJul 17, 16:19 UTC15m
2026-07-17 KAP63 - Jul 17, 13:25 UTCJul 17, 14:04 UTC40m
2026-07-15 KAP305 - Jul 15, 21:00 UTCJul 15, 21:10 UTC10m
2026-07-15 KAP305 - Jul 15, 19:35 UTCJul 15, 19:45 UTC10m
2026-07-15 KAP305 - Jul 15, 17:50 UTCJul 15, 18:00 UTC10m
2026-07-15 KAP305 - Jul 15, 16:10 UTCJul 15, 16:20 UTC10m
2026-07-15 KAP305 - Jul 15, 13:10 UTCJul 15, 13:25 UTC15m
2026-07-15 KAP5150 - Jul 15, 12:10 UTCJul 15, 12:20 UTC10m
2026-07-12 KAP305 - Jul 12, 20:45 UTCJul 12, 20:55 UTC10m
2026-07-12 KAP305 - Jul 12, 19:25 UTCJul 12, 19:35 UTC10m
2026-07-12 KAP305 - Jul 12, 17:55 UTCJul 12, 18:10 UTC15m
2026-07-12 KAP305 - Jul 12, 16:01 UTCJul 12, 16:10 UTC10m
2026-07-12 KAP305 - Jul 12, 14:30 UTCJul 12, 14:40 UTC10m
2026-07-12 KAP305 - Jul 12, 13:05 UTCJul 12, 13:15 UTC10m
2026-07-08 KAP305 - Jul 8, 17:40 UTCJul 8, 17:50 UTC10m
2026-07-08 KAP305 - Jul 8, 16:00 UTCJul 8, 16:10 UTC10m
2026-07-08 KAP305 - Jul 8, 14:45 UTCJul 8, 14:55 UTC10m
2026-07-08 KAP305 - Jul 8, 13:15 UTCJul 8, 13:30 UTC15m
2026-07-07 KAP222 - Jul 7, 17:15 UTCJul 7, 17:35 UTC20m
2026-07-07 KAP222 - Jul 7, 11:50 UTCJul 7, 12:05 UTC15m
2026-07-06 KAP230 - Jul 6, 12:35 UTCJul 6, 12:50 UTC15m
2026-07-05 KAP230 - Jul 5, 18:40 UTCJul 5, 18:55 UTC15m
2026-07-05 KAP230 - Jul 5, 17:25 UTCJul 5, 17:50 UTC25m
2026-07-05 KAP230 - Jul 5, 14:25 UTCJul 5, 14:45 UTC20m
2026-07-05 KAP230 - Jul 5, 12:35 UTCJul 5, 12:50 UTC15m
2026-07-04 KAP230 - Jul 4, 18:55 UTCJul 4, 19:10 UTC15m
2026-07-04 KAP230 - Jul 4, 17:25 UTCJul 4, 17:45 UTC20m
2026-07-04 KAP230 - Jul 4, 14:45 UTCJul 4, 14:55 UTC10m
2026-07-04 KAP230 - Jul 4, 12:40 UTCJul 4, 13:00 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 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 Jul 23, 13:45 UTC.
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 11 distinct callsigns, including KAP230, KAP305, KAP5150, KAP63, KAP726.