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 Jul 25, 18:15 UTC
Flights observed
148
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 18:15 UTC

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 - 148 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 NDU81 - Jul 25, 17:25 UTCJul 25, 18:15 UTC50m
2026-07-23 NDU81 - Jul 23, 16:10 UTCJul 23, 16:40 UTC30m
2026-07-23 NDU81 - Jul 23, 13:10 UTCJul 23, 13:55 UTC45m
2026-07-23 NDU81 - Jul 23, 03:30 UTCJul 23, 04:10 UTC40m
2026-07-22 NDU81 - Jul 22, 20:35 UTCJul 22, 20:50 UTC15m
2026-07-22 NDU81 - Jul 22, 18:55 UTCJul 22, 19:15 UTC20m
2026-07-22 NDU81 - Jul 22, 16:35 UTCJul 22, 17:30 UTC55m
2026-07-21 NDU81 - Jul 21, 21:45 UTCJul 21, 21:55 UTC10m
2026-07-21 NDU81 - Jul 21, 17:10 UTCJul 21, 17:20 UTC10m
2026-07-20 NDU81 - Jul 20, 13:10 UTCJul 20, 13:35 UTC25m
2026-07-18 NDU81 - Jul 18, 20:40 UTCJul 18, 21:30 UTC50m
2026-07-18 NDU81 - Jul 18, 19:20 UTCJul 18, 19:30 UTC10m
2026-07-18 NDU81 - Jul 18, 17:35 UTCJul 18, 17:45 UTC10m
2026-07-18 NDU81 - Jul 18, 15:45 UTCJul 18, 16:45 UTC1h 0m
2026-07-18 NDU81 - Jul 18, 13:05 UTCJul 18, 14:20 UTC1h 15m
2026-07-18 NDU81 - Jul 18, 00:35 UTCJul 18, 02:45 UTC2h 10m
2026-07-17 NDU81 - Jul 17, 22:20 UTCJul 17, 22:35 UTC15m
2026-07-16 NDU81 - Jul 16, 22:30 UTCJul 16, 23:10 UTC40m
2026-07-15 NDU81 - Jul 15, 22:20 UTCJul 15, 22:30 UTC10m
2026-07-15 NDU81 - Jul 15, 19:40 UTCJul 15, 21:00 UTC1h 20m
2026-07-15 NDU81 - Jul 15, 18:00 UTCJul 15, 18:35 UTC35m
2026-07-15 NDU81 - Jul 15, 15:40 UTCJul 15, 16:05 UTC25m
2026-07-15 NDU81 - Jul 15, 03:40 UTCJul 15, 04:40 UTC1h 0m
2026-07-15 NDU81 - Jul 15, 01:35 UTCJul 15, 02:30 UTC55m
2026-07-14 NDU81 - Jul 14, 23:45 UTCJul 15, 00:45 UTC1h 0m
2026-07-14 NDU81 - Jul 14, 21:30 UTCJul 14, 22:55 UTC1h 24m
2026-07-14 NDU81 - Jul 14, 18:25 UTCJul 14, 20:30 UTC2h 5m
2026-07-14 NDU81 - Jul 14, 16:30 UTCJul 14, 17:35 UTC1h 5m
2026-07-14 NDU81 - Jul 14, 14:10 UTCJul 14, 14:35 UTC25m
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

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 Jul 25, 18:15 UTC.
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.