Apparatus

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sensors Mode-S transponder

A46031

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N381ND · operated by UND AEROSPACE FOUNDATION

Hex
A46031
Octal
51060061
Decimal
10,772,529
Country
US
Tail
N381ND
Type
P28A
No current signal · last broadcast 20h ago
Flights observed
119
Distinct callsigns
1
Country
US
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S A46031.

Country allocation

The ICAO 24-bit address A46031 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
NDU81 - 119 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 NDU81 - Jul 13, 13:50 UTCJul 13, 14:05 UTC15m
2026-07-11 NDU81 - Jul 11, 18:55 UTCJul 11, 19:45 UTC50m
2026-07-11 NDU81 - Jul 11, 16:30 UTCJul 11, 16:45 UTC15m
2026-07-11 NDU81 - Jul 11, 15:05 UTCJul 11, 15:25 UTC20m
2026-07-10 NDU81 - Jul 10, 18:15 UTCJul 10, 18:50 UTC35m
2026-07-10 NDU81 - Jul 10, 16:20 UTCJul 10, 16:45 UTC25m
2026-07-10 NDU81 - Jul 10, 14:50 UTCJul 10, 15:15 UTC25m
2026-07-10 NDU81 RDR → DVL Jul 10, 13:00 UTCJul 10, 13:45 UTC45m
2026-07-09 NDU81 - Jul 9, 23:50 UTCJul 10, 00:35 UTC45m
2026-07-09 NDU81 - Jul 9, 19:45 UTCJul 9, 20:00 UTC15m
2026-07-09 NDU81 - Jul 9, 15:15 UTCJul 9, 16:15 UTC1h 0m
2026-07-09 NDU81 - Jul 9, 13:30 UTCJul 9, 14:05 UTC35m
2026-07-09 NDU81 - Jul 9, 02:10 UTCJul 9, 02:35 UTC25m
2026-07-02 NDU81 - Jul 2, 15:00 UTCJul 2, 15:45 UTC45m
2026-07-02 NDU81 - Jul 2, 13:00 UTCJul 2, 13:15 UTC15m
2026-07-02 NDU81 - Jul 2, 02:05 UTCJul 2, 04:15 UTC2h 10m
2026-07-01 NDU81 - Jul 1, 21:35 UTCJul 1, 21:55 UTC20m
2026-07-01 NDU81 - Jul 1, 17:35 UTCJul 1, 18:20 UTC45m
2026-07-01 NDU81 - Jul 1, 15:35 UTCJul 1, 15:55 UTC20m
2026-07-01 NDU81 - Jul 1, 13:05 UTCJul 1, 13:55 UTC50m
2026-06-30 NDU81 - Jun 30, 18:30 UTCJun 30, 18:40 UTC10m
2026-06-30 NDU81 - Jun 30, 13:10 UTCJun 30, 13:40 UTC30m
2026-06-27 NDU81 - Jun 27, 00:55 UTCJun 27, 02:20 UTC1h 25m
2026-06-26 NDU81 - Jun 26, 20:20 UTCJun 26, 20:59 UTC40m
2026-06-26 NDU81 - Jun 26, 16:20 UTCJun 26, 16:39 UTC20m
2026-06-26 NDU81 - Jun 26, 13:59 UTCJun 26, 15:05 UTC1h 5m
2026-06-25 NDU81 - Jun 25, 23:59 UTCJun 26, 00:59 UTC1h 0m
2026-06-25 NDU81 - Jun 25, 21:55 UTCJun 25, 22:54 UTC1h 0m
2026-06-25 NDU81 - Jun 25, 13:35 UTCJun 25, 14:04 UTC30m
2026-06-23 NDU81 - Jun 23, 01:54 UTCJun 23, 02:40 UTC45m
2026-06-22 NDU81 - Jun 22, 21:45 UTCJun 22, 22:24 UTC40m
2026-06-22 NDU81 - Jun 22, 20:19 UTCJun 22, 20:49 UTC30m
2026-06-22 NDU81 - Jun 22, 18:04 UTCJun 22, 18:40 UTC35m
2026-06-20 NDU81 - Jun 20, 19:40 UTCJun 20, 20:45 UTC1h 5m
2026-06-20 NDU81 - Jun 20, 13:39 UTCJun 20, 14:39 UTC1h 0m
2026-06-18 NDU81 - Jun 18, 21:35 UTCJun 18, 21:55 UTC20m
2026-06-18 NDU81 - Jun 18, 19:00 UTCJun 18, 19:20 UTC20m
2026-06-18 NDU81 - Jun 18, 17:05 UTCJun 18, 17:21 UTC16m
2026-06-18 NDU81 - Jun 18, 12:50 UTCJun 18, 13:20 UTC30m
2026-06-17 NDU81 - Jun 17, 00:50 UTCJun 17, 01:55 UTC1h 5m
2026-06-16 NDU81 - Jun 16, 13:30 UTCJun 16, 14:20 UTC50m
2026-06-15 NDU81 - Jun 15, 17:45 UTCJun 15, 18:35 UTC50m
2026-06-15 NDU81 - Jun 15, 12:45 UTCJun 15, 13:54 UTC1h 10m
2026-06-12 NDU81 - Jun 12, 15:35 UTCJun 12, 15:50 UTC15m
2026-06-12 NDU81 - Jun 12, 14:25 UTCJun 12, 14:55 UTC30m
2026-06-11 NDU81 - Jun 11, 02:15 UTCJun 11, 05:15 UTC3h 0m
2026-06-08 NDU81 - Jun 8, 20:20 UTCJun 8, 20:45 UTC25m
2026-06-08 NDU81 - Jun 8, 17:30 UTCJun 8, 18:20 UTC50m
2026-06-08 NDU81 - Jun 8, 13:15 UTCJun 8, 14:00 UTC45m
2026-06-06 NDU81 - Jun 6, 17:10 UTCJun 6, 17:40 UTC30m

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 N381ND page for operator, model, and routing details .

Mode-S A46031 frequently asked

What is Mode-S code A46031?
A46031 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N381ND.
Where is Mode-S A46031 registered?
Mode-S code A46031 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 A46031 broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A46031, octal 51060061, decimal 10,772,529.
What flights does A46031 operate?
Mode-S A46031 has broadcast 1 distinct callsign, including NDU81.