Apparatus

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sensors Mode-S transponder

A420B2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N365US · operated by TECNAM US INC

Hex
A420B2
Octal
51020262
Decimal
10,756,274
Country
US
Tail
N365US
Type
TWEN
No current signal · last broadcast 1d ago
Flights observed
105
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A420B2.

Country allocation

The ICAO 24-bit address A420B2 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
N365US - 104 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 N365US - Jul 23, 17:30 UTCJul 23, 18:50 UTC1h 20m
2026-07-23 N365US ACT → ACT Jul 23, 14:50 UTCJul 23, 15:50 UTC1h 0m
2026-07-22 N365US ACT → ACT Jul 22, 17:25 UTCJul 22, 17:55 UTC30m
2026-07-22 N365US - Jul 22, 13:50 UTCJul 22, 15:20 UTC1h 30m
2026-07-21 N365US SSF → ACT Jul 21, 23:10 UTCJul 22, 00:40 UTC1h 30m
2026-07-21 N365US - Jul 21, 17:55 UTCJul 21, 19:15 UTC1h 20m
2026-07-20 N365US - Jul 20, 17:25 UTCJul 20, 18:45 UTC1h 20m
2026-07-20 N365US - Jul 20, 14:45 UTCJul 20, 16:10 UTC1h 25m
2026-07-17 N365US - Jul 17, 14:44 UTCJul 17, 16:10 UTC1h 25m
2026-07-12 N365US - Jul 12, 15:15 UTCJul 12, 15:45 UTC30m
2026-07-11 N365US - Jul 11, 16:00 UTCJul 11, 17:15 UTC1h 15m
2026-07-10 N365US ACT → ACT Jul 10, 19:50 UTCJul 10, 20:45 UTC55m
2026-07-10 N365US - Jul 10, 17:25 UTCJul 10, 18:15 UTC50m
2026-07-10 N365US ACT → ACT Jul 10, 14:25 UTCJul 10, 15:40 UTC1h 15m
2026-07-09 N365US - Jul 9, 20:55 UTCJul 9, 22:25 UTC1h 30m
2026-07-08 N365US - Jul 8, 17:35 UTCJul 8, 18:40 UTC1h 5m
2026-07-08 N365US - Jul 8, 13:50 UTCJul 8, 15:10 UTC1h 20m
2026-07-08 N365US ACT → ACT Jul 8, 00:30 UTCJul 8, 01:10 UTC40m
2026-07-07 N365US - Jul 7, 17:20 UTCJul 7, 18:15 UTC55m
2026-07-07 N365US ACT → ACT Jul 7, 14:40 UTCJul 7, 15:30 UTC50m
2026-07-05 N365US - Jul 5, 16:05 UTCJul 5, 16:45 UTC40m
2026-07-02 N365US - Jul 2, 20:25 UTCJul 2, 21:35 UTC1h 10m
2026-06-30 N365US - Jun 30, 19:55 UTCJun 30, 21:05 UTC1h 10m
2026-06-30 N365US - Jun 30, 12:45 UTCJun 30, 13:45 UTC1h 0m
2026-06-29 N365US - Jun 29, 20:30 UTCJun 29, 22:10 UTC1h 40m
2026-06-29 N365US - Jun 29, 17:34 UTCJun 29, 19:15 UTC1h 40m
2026-06-29 N365US - Jun 29, 15:24 UTCJun 29, 16:25 UTC1h 0m
2026-06-28 N365US - Jun 28, 22:45 UTCJun 28, 23:29 UTC45m
2026-06-28 N365US - Jun 28, 19:44 UTCJun 28, 21:04 UTC1h 20m
2026-06-28 N365US ACT → ACT Jun 28, 14:54 UTCJun 28, 16:19 UTC1h 25m
2026-06-27 N365US ACT → ACT Jun 27, 19:59 UTCJun 27, 21:10 UTC1h 10m
2026-06-27 N365US - Jun 27, 17:34 UTCJun 27, 18:39 UTC1h 5m
2026-06-27 N365US - Jun 27, 14:29 UTCJun 27, 15:49 UTC1h 20m
2026-06-26 N365US - Jun 26, 16:20 UTCJun 26, 17:44 UTC1h 25m
2026-06-25 N365US - Jun 25, 17:54 UTCJun 25, 19:09 UTC1h 15m
2026-06-25 N365US ACT → ACT Jun 25, 14:39 UTCJun 25, 15:54 UTC1h 15m
2026-06-24 N365US - Jun 24, 17:50 UTCJun 24, 18:34 UTC45m
2026-06-24 N365US - Jun 24, 15:24 UTCJun 24, 16:24 UTC1h 0m
2026-06-24 N365US - Jun 24, 02:24 UTCJun 24, 04:34 UTC2h 10m
2026-06-23 N365US - Jun 23, 20:19 UTCJun 23, 21:45 UTC1h 25m
2026-06-23 N365US ACT → ACT Jun 23, 17:25 UTCJun 23, 18:45 UTC1h 20m
2026-06-23 N365US - Jun 23, 04:25 UTCJun 23, 05:04 UTC40m
2026-06-23 N365US - Jun 23, 02:34 UTCJun 23, 03:25 UTC50m
2026-06-22 N365US ACT → ACT Jun 22, 20:49 UTCJun 22, 22:10 UTC1h 20m
2026-06-22 N365US ACT → ACT Jun 22, 18:24 UTCJun 22, 20:14 UTC1h 50m
2026-06-22 N365US - Jun 22, 15:35 UTCJun 22, 16:29 UTC55m
2026-06-19 N365US ACT → ACT Jun 19, 02:14 UTCJun 19, 04:04 UTC1h 50m
2026-06-16 N365US - Jun 16, 03:15 UTCJun 16, 04:15 UTC1h 0m
2026-06-14 N365US - Jun 14, 14:50 UTCJun 14, 15:15 UTC25m
2026-06-14 N365US - Jun 14, 03:10 UTCJun 14, 04:50 UTC1h 40m

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 N365US page for operator, model, and routing details .

Mode-S A420B2 frequently asked

What is Mode-S code A420B2?
A420B2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N365US.
Where is Mode-S A420B2 registered?
Mode-S code A420B2 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 A420B2 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A420B2, octal 51020262, decimal 10,756,274.
What flights does A420B2 operate?
Mode-S A420B2 has broadcast 1 distinct callsign, including N365US.