Apparatus

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sensors Mode-S transponder

ACF5B5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N934ND · operated by UNIVERSITY OF NORTH DAKOTA

Hex
ACF5B5
Octal
53172665
Decimal
11,335,093
Country
US
Tail
N934ND
Type
P28A
No current signal · last broadcast 4d ago
Flights observed
115
Distinct callsigns
1
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S ACF5B5.

Country allocation

The ICAO 24-bit address ACF5B5 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
NDU34 - 115 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 NDU34 - Jul 25, 18:05 UTCJul 25, 18:50 UTC45m
2026-07-22 NDU34 - Jul 22, 13:05 UTCJul 22, 13:40 UTC35m
2026-07-21 NDU34 - Jul 21, 15:35 UTCJul 21, 16:40 UTC1h 5m
2026-07-21 NDU34 - Jul 21, 13:00 UTCJul 21, 14:00 UTC1h 0m
2026-07-20 NDU34 - Jul 20, 12:10 UTCJul 20, 12:35 UTC25m
2026-07-18 NDU34 - Jul 18, 12:35 UTCJul 18, 13:10 UTC35m
2026-07-17 NDU34 - Jul 17, 21:25 UTCJul 17, 22:29 UTC1h 5m
2026-07-16 NDU34 - Jul 16, 19:45 UTCJul 16, 19:55 UTC10m
2026-07-16 NDU34 - Jul 16, 16:40 UTCJul 16, 17:05 UTC25m
2026-07-15 NDU34 - Jul 15, 17:00 UTCJul 15, 17:30 UTC30m
2026-07-15 NDU34 - Jul 15, 13:25 UTCJul 15, 15:10 UTC1h 45m
2026-07-15 NDU34 - Jul 15, 02:45 UTCJul 15, 04:45 UTC2h 0m
2026-07-15 NDU34 - Jul 15, 01:00 UTCJul 15, 01:50 UTC50m
2026-07-14 NDU34 - Jul 14, 22:55 UTCJul 15, 00:05 UTC1h 10m
2026-07-14 NDU34 - Jul 14, 19:35 UTCJul 14, 21:50 UTC2h 15m
2026-07-14 NDU34 - Jul 14, 17:25 UTCJul 14, 18:15 UTC50m
2026-07-14 NDU34 - Jul 14, 13:05 UTCJul 14, 14:20 UTC1h 15m
2026-07-10 NDU34 - Jul 10, 23:25 UTCJul 11, 00:25 UTC1h 0m
2026-07-10 NDU34 - Jul 10, 22:20 UTCJul 10, 22:55 UTC35m
2026-07-10 NDU34 - Jul 10, 18:35 UTCJul 10, 19:00 UTC25m
2026-07-10 NDU34 - Jul 10, 16:55 UTCJul 10, 17:20 UTC25m
2026-07-09 NDU34 - Jul 9, 19:20 UTCJul 9, 20:05 UTC45m
2026-07-09 NDU34 - Jul 9, 17:25 UTCJul 9, 18:15 UTC50m
2026-07-09 NDU34 - Jul 9, 13:35 UTCJul 9, 13:45 UTC10m
2026-07-08 NDU34 - Jul 8, 18:45 UTCJul 8, 19:50 UTC1h 5m
2026-07-08 NDU34 - Jul 8, 16:50 UTCJul 8, 17:15 UTC25m
2026-07-08 NDU34 - Jul 8, 15:25 UTCJul 8, 15:40 UTC15m
2026-07-08 NDU34 - Jul 8, 14:30 UTCJul 8, 14:45 UTC15m
2026-07-08 NDU34 - Jul 8, 05:25 UTCJul 8, 05:45 UTC20m
2026-07-07 NDU34 - Jul 7, 18:20 UTCJul 7, 19:00 UTC40m
2026-07-07 NDU34 - Jul 7, 14:10 UTCJul 7, 15:25 UTC1h 15m
2026-07-07 NDU34 - Jul 7, 00:00 UTCJul 7, 00:10 UTC10m
2026-07-06 NDU34 - Jul 6, 21:55 UTCJul 6, 22:20 UTC25m
2026-06-25 NDU34 - Jun 25, 20:45 UTCJun 25, 21:29 UTC45m
2026-06-25 NDU34 - Jun 25, 14:59 UTCJun 25, 15:34 UTC35m
2026-06-25 NDU34 - Jun 25, 12:40 UTCJun 25, 13:00 UTC20m
2026-06-25 NDU34 - Jun 25, 04:04 UTCJun 25, 04:20 UTC15m
2026-06-25 NDU34 - Jun 25, 02:49 UTCJun 25, 02:59 UTC10m
2026-06-24 NDU34 - Jun 24, 21:44 UTCJun 24, 22:35 UTC50m
2026-06-24 NDU34 - Jun 24, 18:44 UTCJun 24, 19:29 UTC45m
2026-06-24 NDU34 - Jun 24, 16:24 UTCJun 24, 17:10 UTC45m
2026-06-24 NDU34 - Jun 24, 03:40 UTCJun 24, 05:49 UTC2h 10m
2026-06-24 NDU34 - Jun 24, 01:19 UTCJun 24, 01:49 UTC30m
2026-06-23 NDU34 - Jun 23, 23:55 UTCJun 24, 00:30 UTC35m
2026-06-22 NDU34 - Jun 22, 23:55 UTCJun 23, 01:54 UTC2h 0m
2026-06-22 NDU34 - Jun 22, 19:40 UTCJun 22, 19:49 UTC10m
2026-06-20 NDU34 - Jun 20, 18:10 UTCJun 20, 18:29 UTC20m
2026-06-20 NDU34 - Jun 20, 12:30 UTCJun 20, 12:39 UTC10m
2026-06-19 NDU34 - Jun 19, 03:39 UTCJun 19, 05:40 UTC2h 0m
2026-06-18 NDU34 - Jun 18, 22:45 UTCJun 18, 23:00 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 N934ND page for operator, model, and routing details .

Mode-S ACF5B5 frequently asked

What is Mode-S code ACF5B5?
ACF5B5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N934ND.
Where is Mode-S ACF5B5 registered?
Mode-S code ACF5B5 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 ACF5B5 broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACF5B5, octal 53172665, decimal 11,335,093.
What flights does ACF5B5 operate?
Mode-S ACF5B5 has broadcast 1 distinct callsign, including NDU34.