Apparatus

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sensors Mode-S transponder

AC4DF2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N892ND · operated by UNIVERSITY OF NORTH DAKOTA, C/O JOHN D ODEGARD SCHOOL OF AEROSPACE SCIENCES

Hex
AC4DF2
Octal
53046762
Decimal
11,292,146
Country
US
Tail
N892ND
Type
PA44
No current signal · last broadcast Jul 18, 16:45 UTC
Flights observed
123
Distinct callsigns
1
Country
US
Last broadcast
Jul 18, 16:45 UTC

Last known position

Most recent position reported by Mode-S AC4DF2.

Country allocation

The ICAO 24-bit address AC4DF2 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
NDU92T - 123 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 NDU92T - Jul 18, 16:05 UTCJul 18, 16:45 UTC40m
2026-07-18 NDU92T - Jul 18, 12:55 UTCJul 18, 13:25 UTC30m
2026-07-18 NDU92T - Jul 18, 00:19 UTCJul 18, 01:20 UTC1h 0m
2026-07-17 NDU92T - Jul 17, 22:15 UTCJul 17, 23:05 UTC50m
2026-07-17 NDU92T - Jul 17, 17:05 UTCJul 17, 17:15 UTC10m
2026-07-17 NDU92T - Jul 17, 13:10 UTCJul 17, 14:00 UTC50m
2026-07-16 NDU92T - Jul 16, 18:34 UTCJul 16, 18:44 UTC10m
2026-07-16 NDU92T - Jul 16, 17:40 UTCJul 16, 18:00 UTC20m
2026-07-16 NDU92T - Jul 16, 12:14 UTCJul 16, 12:40 UTC25m
2026-07-15 NDU92T - Jul 15, 13:50 UTCJul 15, 15:00 UTC1h 10m
2026-07-15 NDU92T - Jul 15, 04:55 UTCJul 15, 05:10 UTC15m
2026-07-15 NDU92T - Jul 15, 03:35 UTCJul 15, 04:10 UTC35m
2026-07-15 NDU92T - Jul 15, 00:50 UTCJul 15, 01:40 UTC50m
2026-07-14 NDU92T - Jul 14, 21:35 UTCJul 14, 23:35 UTC1h 59m
2026-07-14 NDU92T - Jul 14, 18:35 UTCJul 14, 20:10 UTC1h 35m
2026-07-14 NDU92T - Jul 14, 16:10 UTCJul 14, 16:45 UTC35m
2026-07-14 NDU92T - Jul 14, 13:30 UTCJul 14, 14:40 UTC1h 10m
2026-07-13 NDU92T - Jul 13, 18:25 UTCJul 13, 19:00 UTC35m
2026-07-13 NDU92T - Jul 13, 15:05 UTCJul 13, 16:35 UTC1h 30m
2026-07-11 NDU92T - Jul 11, 18:05 UTCJul 11, 18:55 UTC50m
2026-07-10 NDU92T - Jul 10, 22:15 UTCJul 10, 23:05 UTC50m
2026-07-10 NDU92T - Jul 10, 18:45 UTCJul 10, 19:20 UTC35m
2026-07-10 NDU92T - Jul 10, 16:20 UTCJul 10, 16:50 UTC30m
2026-07-10 NDU92T - Jul 10, 14:30 UTCJul 10, 15:30 UTC1h 0m
2026-07-09 NDU92T - Jul 9, 13:30 UTCJul 9, 14:00 UTC30m
2026-07-09 NDU92T - Jul 9, 05:05 UTCJul 9, 05:35 UTC30m
2026-07-09 NDU92T - Jul 9, 03:35 UTCJul 9, 04:15 UTC40m
2026-07-08 NDU92T - Jul 8, 23:30 UTCJul 9, 00:00 UTC30m
2026-07-08 NDU92T - Jul 8, 18:40 UTCJul 8, 19:15 UTC35m
2026-07-08 NDU92T - Jul 8, 17:20 UTCJul 8, 17:55 UTC35m
2026-07-08 NDU92T - Jul 8, 14:10 UTCJul 8, 14:25 UTC15m
2026-07-07 NDU92T - Jul 7, 14:30 UTCJul 7, 16:05 UTC1h 35m
2026-07-06 NDU92T - Jul 6, 16:30 UTCJul 6, 16:55 UTC25m
2026-07-01 NDU92T - Jul 1, 23:50 UTCJul 2, 00:05 UTC15m
2026-07-01 NDU92T - Jul 1, 16:05 UTCJul 1, 16:35 UTC30m
2026-06-30 NDU92T - Jun 30, 15:25 UTCJun 30, 16:05 UTC40m
2026-06-30 NDU92T - Jun 30, 13:50 UTCJun 30, 14:40 UTC50m
2026-06-27 NDU92T - Jun 27, 13:55 UTCJun 27, 14:49 UTC55m
2026-06-26 NDU92T - Jun 26, 23:30 UTCJun 26, 23:44 UTC15m
2026-06-26 NDU92T - Jun 26, 19:39 UTCJun 26, 20:40 UTC1h 0m
2026-06-26 NDU92T - Jun 26, 16:05 UTCJun 26, 16:14 UTC10m
2026-06-26 NDU92T - Jun 26, 00:24 UTCJun 26, 01:24 UTC1h 0m
2026-06-25 NDU92T - Jun 25, 14:24 UTCJun 25, 15:04 UTC40m
2026-06-24 NDU92T - Jun 24, 03:50 UTCJun 24, 04:10 UTC20m
2026-06-23 NDU92T - Jun 23, 19:04 UTCJun 23, 21:05 UTC2h 0m
2026-06-22 NDU92T - Jun 22, 20:55 UTCJun 22, 21:25 UTC30m
2026-06-22 NDU92T - Jun 22, 13:35 UTCJun 22, 14:14 UTC40m
2026-06-20 NDU92T - Jun 20, 16:09 UTCJun 20, 16:44 UTC35m
2026-06-20 NDU92T - Jun 20, 13:55 UTCJun 20, 14:24 UTC30m
2026-06-19 NDU92T - Jun 19, 00:55 UTCJun 19, 01:19 UTC25m

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 N892ND page for operator, model, and routing details .

Mode-S AC4DF2 frequently asked

What is Mode-S code AC4DF2?
AC4DF2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N892ND.
Where is Mode-S AC4DF2 registered?
Mode-S code AC4DF2 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 AC4DF2 broadcasting right now?
No active broadcast right now. Last signal was Jul 18, 16:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC4DF2, octal 53046762, decimal 11,292,146.
What flights does AC4DF2 operate?
Mode-S AC4DF2 has broadcast 1 distinct callsign, including NDU92T.