Apparatus

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sensors Mode-S transponder

A4B0E2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N401FN · operated by FLYNYON

Hex
A4B0E2
Octal
51130342
Decimal
10,793,186
Country
US
Tail
N401FN
No current signal · last broadcast 7h ago
Flights observed
274
Distinct callsigns
1
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A4B0E2.

Country allocation

The ICAO 24-bit address A4B0E2 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
N401FN - 274 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 N401FN - May 30, 01:15 UTCMay 30, 01:45 UTC30m
2026-05-30 N401FN - May 30, 00:05 UTCMay 30, 00:20 UTC15m
2026-05-29 N401FN - May 29, 23:20 UTCMay 29, 23:35 UTC15m
2026-05-29 N401FN - May 29, 21:05 UTCMay 29, 21:20 UTC15m
2026-05-29 N401FN - May 29, 19:40 UTCMay 29, 19:55 UTC15m
2026-05-29 N401FN - May 29, 18:50 UTCMay 29, 19:05 UTC15m
2026-05-29 N401FN - May 29, 17:30 UTCMay 29, 17:50 UTC20m
2026-05-29 N401FN - May 29, 16:30 UTCMay 29, 16:55 UTC25m
2026-05-29 N401FN - May 29, 14:45 UTCMay 29, 15:40 UTC55m
2026-05-29 N401FN - May 29, 13:00 UTCMay 29, 14:10 UTC1h 10m
2026-05-28 N401FN - May 28, 22:45 UTCMay 29, 01:30 UTC2h 45m
2026-05-28 N401FN - May 28, 21:55 UTCMay 28, 22:10 UTC15m
2026-05-28 N401FN - May 28, 20:55 UTCMay 28, 21:10 UTC15m
2026-05-28 N401FN - May 28, 17:15 UTCMay 28, 17:35 UTC20m
2026-05-28 N401FN - May 28, 16:15 UTCMay 28, 16:45 UTC30m
2026-05-28 N401FN - May 28, 15:00 UTCMay 28, 15:25 UTC25m
2026-05-28 N401FN - May 28, 13:25 UTCMay 28, 13:40 UTC15m
2026-05-28 N401FN - May 28, 01:15 UTCMay 28, 01:35 UTC20m
2026-05-28 N401FN - May 28, 00:20 UTCMay 28, 00:35 UTC15m
2026-05-27 N401FN - May 27, 23:10 UTCMay 27, 23:30 UTC20m
2026-05-27 N401FN - May 27, 21:55 UTCMay 27, 22:20 UTC25m
2026-05-27 N401FN - May 27, 18:05 UTCMay 27, 18:25 UTC20m
2026-05-27 N401FN - May 27, 15:55 UTCMay 27, 16:10 UTC15m
2026-05-27 N401FN - May 27, 14:55 UTCMay 27, 15:15 UTC20m
2026-05-27 N401FN - May 27, 13:50 UTCMay 27, 14:05 UTC15m
2026-05-27 N401FN - May 27, 01:14 UTCMay 27, 01:29 UTC15m
2026-05-27 N401FN - May 27, 00:10 UTCMay 27, 00:25 UTC15m
2026-05-26 N401FN - May 26, 21:55 UTCMay 26, 22:20 UTC25m
2026-05-26 N401FN - May 26, 20:45 UTCMay 26, 21:00 UTC15m
2026-05-26 N401FN - May 26, 17:30 UTCMay 26, 17:59 UTC30m
2026-05-26 N401FN - May 26, 15:00 UTCMay 26, 16:40 UTC1h 40m
2026-05-26 N401FN - May 26, 14:00 UTCMay 26, 14:30 UTC30m
2026-05-25 N401FN - May 25, 23:54 UTCMay 26, 00:14 UTC20m
2026-05-25 N401FN - May 25, 21:15 UTCMay 25, 21:30 UTC15m
2026-05-25 N401FN - May 25, 20:09 UTCMay 25, 20:24 UTC15m
2026-05-25 N401FN - May 25, 19:00 UTCMay 25, 19:20 UTC20m
2026-05-25 N401FN - May 25, 17:00 UTCMay 25, 17:30 UTC30m
2026-05-25 N401FN - May 25, 15:45 UTCMay 25, 16:00 UTC15m
2026-05-23 N401FN - May 23, 19:35 UTCMay 23, 20:30 UTC55m
2026-05-23 N401FN - May 23, 17:45 UTCMay 23, 18:05 UTC20m
2026-05-23 N401FN - May 23, 15:50 UTCMay 23, 16:05 UTC15m
2026-05-23 N401FN - May 23, 14:40 UTCMay 23, 15:10 UTC30m
2026-05-23 N401FN - May 23, 02:20 UTCMay 23, 02:35 UTC14m
2026-05-23 N401FN - May 23, 01:00 UTCMay 23, 01:25 UTC25m
2026-05-22 N401FN - May 22, 23:55 UTCMay 23, 00:10 UTC15m
2026-05-22 N401FN - May 22, 22:20 UTCMay 22, 23:15 UTC55m
2026-05-22 N401FN - May 22, 15:05 UTCMay 22, 16:50 UTC1h 45m
2026-05-22 N401FN - May 22, 14:05 UTCMay 22, 14:30 UTC25m
2026-05-22 N401FN - May 22, 12:55 UTCMay 22, 13:10 UTC15m
2026-05-21 N401FN - May 21, 23:55 UTCMay 22, 00:10 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 N401FN page for operator, model, and routing details .

Mode-S A4B0E2 frequently asked

What is Mode-S code A4B0E2?
A4B0E2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N401FN.
Where is Mode-S A4B0E2 registered?
Mode-S code A4B0E2 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 A4B0E2 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4B0E2, octal 51130342, decimal 10,793,186.
What flights does A4B0E2 operate?
Mode-S A4B0E2 has broadcast 1 distinct callsign, including N401FN.