Apparatus

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sensors Mode-S transponder

A8AF59

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N659ND · PIPER PA-28-140/150/160/180 · operated by UND AEROSPACE FOUNDATION

Hex
A8AF59
Octal
52127531
Decimal
11,054,937
Country
US
Tail
N659ND
Type
P28A
No current signal · last broadcast 16h ago
Flights observed
167
Distinct callsigns
1
Country
US
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S A8AF59.

Country allocation

The ICAO 24-bit address A8AF59 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
NDU659 - 167 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 NDU659 - Jul 13, 16:35 UTCJul 13, 17:45 UTC1h 10m
2026-07-13 NDU659 AZA → AZA Jul 13, 13:30 UTCJul 13, 15:00 UTC1h 30m
2026-07-12 NDU659 - Jul 12, 15:35 UTCJul 12, 16:40 UTC1h 5m
2026-07-11 NDU659 - Jul 11, 16:30 UTCJul 11, 18:00 UTC1h 30m
2026-07-11 NDU659 - Jul 11, 14:15 UTCJul 11, 15:25 UTC1h 10m
2026-07-10 NDU659 - Jul 10, 17:40 UTCJul 10, 19:10 UTC1h 30m
2026-07-09 NDU659 AZA → AZA Jul 9, 13:25 UTCJul 9, 14:15 UTC50m
2026-07-08 NDU659 AZA → AZA Jul 8, 16:10 UTCJul 8, 17:35 UTC1h 25m
2026-07-08 NDU659 - Jul 8, 13:35 UTCJul 8, 15:05 UTC1h 30m
2026-07-07 NDU659 - Jul 7, 18:30 UTCJul 7, 19:35 UTC1h 5m
2026-07-07 NDU659 - Jul 7, 15:45 UTCJul 7, 17:20 UTC1h 35m
2026-07-07 NDU659 - Jul 7, 13:25 UTCJul 7, 14:45 UTC1h 20m
2026-07-06 NDU659 - Jul 6, 16:10 UTCJul 6, 18:15 UTC2h 5m
2026-07-06 NDU659 - Jul 6, 14:10 UTCJul 6, 15:15 UTC1h 5m
2026-07-05 NDU659 - Jul 5, 17:30 UTCJul 5, 18:45 UTC1h 15m
2026-07-05 NDU659 - Jul 5, 15:30 UTCJul 5, 16:35 UTC1h 5m
2026-07-03 NDU659 - Jul 3, 16:35 UTCJul 3, 17:50 UTC1h 15m
2026-07-03 NDU659 - Jul 3, 14:05 UTCJul 3, 15:15 UTC1h 10m
2026-07-02 NDU659 - Jul 2, 17:30 UTCJul 2, 19:10 UTC1h 40m
2026-07-02 NDU659 AZA → AZA Jul 2, 14:20 UTCJul 2, 15:55 UTC1h 35m
2026-07-02 NDU659 - Jul 2, 01:15 UTCJul 2, 02:50 UTC1h 35m
2026-06-29 NDU659 - Jun 29, 15:24 UTCJun 29, 17:10 UTC1h 45m
2026-06-29 NDU659 - Jun 29, 12:45 UTCJun 29, 14:09 UTC1h 25m
2026-06-28 NDU659 AZA → AZA Jun 28, 15:29 UTCJun 28, 18:29 UTC3h 0m
2026-06-28 NDU659 - Jun 28, 12:50 UTCJun 28, 14:34 UTC1h 45m
2026-06-27 NDU659 - Jun 27, 17:09 UTCJun 27, 18:09 UTC1h 0m
2026-06-27 NDU659 - Jun 27, 15:39 UTCJun 27, 16:10 UTC30m
2026-06-27 NDU659 - Jun 27, 12:50 UTCJun 27, 14:45 UTC1h 55m
2026-06-27 NDU659 - Jun 27, 01:35 UTCJun 27, 03:49 UTC2h 15m
2026-06-26 NDU659 - Jun 26, 17:59 UTCJun 26, 19:39 UTC1h 40m
2026-06-26 NDU659 - Jun 26, 15:15 UTCJun 26, 16:49 UTC1h 35m
2026-06-26 NDU659 AZA → AZA Jun 26, 13:04 UTCJun 26, 14:19 UTC1h 15m
2026-06-26 NDU659 - Jun 26, 03:50 UTCJun 26, 05:30 UTC1h 40m
2026-06-26 NDU659 AZA → AZA Jun 26, 01:05 UTCJun 26, 02:14 UTC1h 10m
2026-06-25 NDU659 - Jun 25, 15:59 UTCJun 25, 17:20 UTC1h 20m
2026-06-25 NDU659 - Jun 25, 12:54 UTCJun 25, 14:24 UTC1h 30m
2026-06-25 NDU659 - Jun 25, 04:35 UTCJun 25, 05:50 UTC1h 15m
2026-06-25 NDU659 - Jun 25, 01:44 UTCJun 25, 03:04 UTC1h 20m
2026-06-24 NDU659 - Jun 24, 18:25 UTCJun 24, 19:15 UTC50m
2026-06-24 NDU659 - Jun 24, 15:49 UTCJun 24, 17:10 UTC1h 20m
2026-06-24 NDU659 - Jun 24, 12:50 UTCJun 24, 14:29 UTC1h 40m
2026-06-24 NDU659 - Jun 24, 01:14 UTCJun 24, 02:49 UTC1h 35m
2026-06-23 NDU659 - Jun 23, 15:30 UTCJun 23, 17:25 UTC1h 55m
2026-06-23 NDU659 AZA → AZA Jun 23, 13:15 UTCJun 23, 14:29 UTC1h 15m
2026-06-22 NDU659 - Jun 22, 17:40 UTCJun 22, 19:24 UTC1h 45m
2026-06-22 NDU659 - Jun 22, 13:19 UTCJun 22, 15:59 UTC2h 40m
2026-06-21 NDU659 AZA → AZA Jun 21, 13:44 UTCJun 21, 16:54 UTC3h 10m
2026-06-20 NDU659 - Jun 20, 16:44 UTCJun 20, 18:10 UTC1h 25m
2026-06-20 NDU659 AZA → AZA Jun 20, 14:05 UTCJun 20, 15:39 UTC1h 35m
2026-06-20 NDU659 - Jun 20, 01:29 UTCJun 20, 02:35 UTC1h 5m

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 N659ND page for operator, model, and routing details .

Mode-S A8AF59 frequently asked

What is Mode-S code A8AF59?
A8AF59 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N659ND.
Where is Mode-S A8AF59 registered?
Mode-S code A8AF59 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 A8AF59 broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8AF59, octal 52127531, decimal 11,054,937.
What flights does A8AF59 operate?
Mode-S A8AF59 has broadcast 1 distinct callsign, including NDU659.