Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A3D021

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N345CP · BRITTEN-NORMAN BN-2 Islander · operated by CAT AVIATION LLC

Hex
A3D021
Octal
50750041
Decimal
10,735,649
Country
US
Tail
N345CP
Type
BN2P
No current signal · last broadcast Jul 22, 21:55 UTC
Flights observed
92
Distinct callsigns
1
Country
US
Last broadcast
Jul 22, 21:55 UTC

Last known position

Most recent position reported by Mode-S A3D021.

Country allocation

The ICAO 24-bit address A3D021 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 1 distinct

Callsign Airline Flights Last seen
N345CP - 92 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 N345CP - Jul 22, 21:35 UTCJul 22, 21:55 UTC20m
2026-07-22 N345CP - Jul 22, 18:25 UTCJul 22, 18:35 UTC10m
2026-07-15 N345CP - Jul 15, 19:25 UTCJul 15, 19:40 UTC15m
2026-07-15 N345CP - Jul 15, 18:05 UTCJul 15, 18:15 UTC10m
2026-07-14 N345CP - Jul 14, 22:45 UTCJul 14, 23:00 UTC15m
2026-07-14 N345CP - Jul 14, 19:35 UTCJul 14, 22:05 UTC2h 30m
2026-07-14 N345CP - Jul 14, 17:35 UTCJul 14, 18:30 UTC55m
2026-07-14 N345CP - Jul 14, 15:50 UTCJul 14, 16:45 UTC55m
2026-07-14 N345CP - Jul 14, 14:15 UTCJul 14, 14:25 UTC10m
2026-07-13 N345CP - Jul 13, 21:35 UTCJul 13, 21:45 UTC10m
2026-07-13 N345CP - Jul 13, 20:20 UTCJul 13, 20:30 UTC10m
2026-07-12 N345CP - Jul 12, 15:50 UTCJul 12, 16:05 UTC15m
2026-07-10 N345CP - Jul 10, 14:50 UTCJul 10, 15:00 UTC10m
2026-07-10 N345CP - Jul 10, 13:05 UTCJul 10, 13:20 UTC15m
2026-07-09 N345CP - Jul 9, 15:35 UTCJul 9, 15:45 UTC10m
2026-07-09 N345CP - Jul 9, 14:00 UTCJul 9, 14:10 UTC10m
2026-07-09 N345CP - Jul 9, 13:05 UTCJul 9, 13:15 UTC10m
2026-07-05 N345CP - Jul 5, 20:35 UTCJul 5, 20:50 UTC15m
2026-07-05 N345CP - Jul 5, 18:55 UTCJul 5, 19:10 UTC15m
2026-07-04 N345CP - Jul 4, 22:30 UTCJul 4, 22:45 UTC15m
2026-07-04 N345CP - Jul 4, 21:25 UTCJul 4, 21:40 UTC15m
2026-07-02 N345CP - Jul 2, 22:40 UTCJul 2, 22:55 UTC15m
2026-07-02 N345CP - Jul 2, 21:25 UTCJul 2, 21:35 UTC10m
2026-07-02 N345CP - Jul 2, 19:55 UTCJul 2, 20:15 UTC20m
2026-07-02 N345CP - Jul 2, 18:30 UTCJul 2, 18:40 UTC10m
2026-07-02 N345CP - Jul 2, 17:25 UTCJul 2, 17:45 UTC20m
2026-07-02 N345CP - Jul 2, 16:15 UTCJul 2, 16:25 UTC10m
2026-06-27 N345CP - Jun 27, 20:55 UTCJun 27, 21:10 UTC15m
2026-06-27 N345CP - Jun 27, 19:29 UTCJun 27, 19:39 UTC10m
2026-06-22 N345CP - Jun 22, 22:49 UTCJun 22, 22:59 UTC10m
2026-06-22 N345CP - Jun 22, 20:04 UTCJun 22, 21:25 UTC1h 20m
2026-06-22 N345CP - Jun 22, 17:00 UTCJun 22, 18:40 UTC1h 40m
2026-06-16 N345CP - Jun 16, 19:30 UTCJun 16, 19:45 UTC15m
2026-06-16 N345CP - Jun 16, 18:05 UTCJun 16, 18:20 UTC15m
2026-06-10 N345CP - Jun 10, 19:00 UTCJun 10, 19:15 UTC15m
2026-06-10 N345CP - Jun 10, 17:25 UTCJun 10, 17:35 UTC10m
2026-06-07 N345CP - Jun 7, 12:50 UTCJun 7, 13:05 UTC15m
2026-06-02 N345CP - Jun 2, 20:50 UTCJun 2, 21:00 UTC10m
2026-06-02 N345CP - Jun 2, 19:30 UTCJun 2, 19:45 UTC15m
2026-05-25 N345CP - May 25, 22:34 UTCMay 25, 22:44 UTC10m
2026-05-25 N345CP - May 25, 20:45 UTCMay 25, 21:19 UTC35m
2026-05-25 N345CP - May 25, 18:55 UTCMay 25, 19:10 UTC15m
2026-05-25 N345CP - May 25, 17:20 UTCMay 25, 17:35 UTC15m
2026-05-23 N345CP - May 23, 16:50 UTCMay 23, 17:00 UTC10m
2026-05-23 N345CP - May 23, 15:40 UTCMay 23, 15:50 UTC10m
2026-05-23 N345CP - May 23, 14:55 UTCMay 23, 15:05 UTC10m
2026-05-20 N345CP - May 20, 20:10 UTCMay 20, 20:20 UTC10m
2026-05-20 N345CP - May 20, 18:45 UTCMay 20, 18:55 UTC10m
2026-05-19 N345CP - May 19, 14:30 UTCMay 19, 14:45 UTC15m
2026-05-19 N345CP - May 19, 13:20 UTCMay 19, 13:35 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 N345CP page for operator, model, and routing details .

Mode-S A3D021 frequently asked

What is Mode-S code A3D021?
A3D021 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N345CP.
Where is Mode-S A3D021 registered?
Mode-S code A3D021 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 A3D021 broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3D021, octal 50750041, decimal 10,735,649.
What flights does A3D021 operate?
Mode-S A3D021 has broadcast 1 distinct callsign, including N345CP.