Apparatus

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sensors Mode-S transponder

A4E321

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N414BM · CESSNA 414 Chancellor · operated by BORDEN JOHN

Hex
A4E321
Octal
51161441
Decimal
10,806,049
Country
US
Tail
N414BM
Type
C414
No current signal · last broadcast Jul 8, 23:05 UTC
Flights observed
22
Distinct callsigns
1
Country
US
Last broadcast
Jul 8, 23:05 UTC

Last known position

Most recent position reported by Mode-S A4E321.

Country allocation

The ICAO 24-bit address A4E321 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
N414BM - 22 2026-07-08

Recent flights last 22

DateFlightRouteTakeoffLandingDuration
2026-07-08 N414BM - Jul 8, 22:15 UTCJul 8, 23:05 UTC50m
2026-07-07 N414BM - Jul 7, 20:25 UTCJul 7, 21:10 UTC45m
2026-07-02 N414BM - Jul 2, 18:40 UTCJul 2, 20:00 UTC1h 20m
2026-07-02 N414BM - Jul 2, 16:30 UTCJul 2, 17:55 UTC1h 25m
2026-06-28 N414BM - Jun 28, 03:50 UTCJun 28, 04:59 UTC1h 10m
2026-06-27 N414BM - Jun 27, 18:35 UTCJun 27, 20:04 UTC1h 30m
2026-06-21 N414BM - Jun 21, 21:24 UTCJun 21, 22:15 UTC50m
2026-06-21 N414BM - Jun 21, 19:24 UTCJun 21, 20:05 UTC40m
2026-06-19 N414BM - Jun 19, 19:19 UTCJun 19, 20:14 UTC55m
2026-06-19 N414BM - Jun 19, 17:14 UTCJun 19, 17:44 UTC30m
2026-06-14 N414BM - Jun 14, 20:55 UTCJun 14, 21:30 UTC35m
2026-06-14 N414BM - Jun 14, 18:35 UTCJun 14, 19:05 UTC30m
2026-06-10 N414BM - Jun 10, 00:10 UTCJun 10, 00:45 UTC35m
2026-06-09 N414BM - Jun 9, 22:30 UTCJun 9, 23:00 UTC30m
2026-05-28 N414BM - May 28, 20:15 UTCMay 28, 20:35 UTC20m
2026-05-28 N414BM - May 28, 18:40 UTCMay 28, 18:55 UTC15m
2026-05-25 N414BM - May 25, 23:49 UTCMay 26, 00:44 UTC55m
2026-05-25 N414BM - May 25, 22:10 UTCMay 25, 22:44 UTC35m
2026-05-22 N414BM - May 22, 23:05 UTCMay 22, 23:50 UTC45m
2026-05-22 N414BM - May 22, 21:10 UTCMay 22, 21:50 UTC40m
2026-05-18 N414BM - May 18, 21:40 UTCMay 18, 23:20 UTC1h 40m
2026-05-01 N414BM - May 1, 17:45 UTCMay 1, 19:40 UTC1h 55m

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 N414BM page for operator, model, and routing details .

Mode-S A4E321 frequently asked

What is Mode-S code A4E321?
A4E321 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N414BM.
Where is Mode-S A4E321 registered?
Mode-S code A4E321 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 A4E321 broadcasting right now?
No active broadcast right now. Last signal was Jul 8, 23:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4E321, octal 51161441, decimal 10,806,049.
What flights does A4E321 operate?
Mode-S A4E321 has broadcast 1 distinct callsign, including N414BM.