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sensors Mode-S transponder

ADC655

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N987ND · operated by UND AEROSPACE FOUNDATION

Hex
ADC655
Octal
53343125
Decimal
11,388,501
Country
US
Tail
N987ND
Type
PA44
No current signal · last broadcast 8d ago
Flights observed
106
Distinct callsigns
1
Country
US
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S ADC655.

Country allocation

The ICAO 24-bit address ADC655 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
NDU87T - 106 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 NDU87T - Jul 25, 18:50 UTCJul 25, 19:15 UTC25m
2026-07-25 NDU87T - Jul 25, 16:15 UTCJul 25, 16:50 UTC35m
2026-07-24 NDU87T - Jul 24, 21:00 UTCJul 24, 21:40 UTC40m
2026-07-24 NDU87T - Jul 24, 15:10 UTCJul 24, 15:30 UTC20m
2026-07-24 NDU87T - Jul 24, 13:25 UTCJul 24, 14:15 UTC50m
2026-07-21 NDU87T - Jul 21, 17:45 UTCJul 21, 18:15 UTC30m
2026-07-21 NDU87T - Jul 21, 16:50 UTCJul 21, 17:10 UTC20m
2026-07-21 NDU87T - Jul 21, 14:30 UTCJul 21, 15:00 UTC30m
2026-07-20 NDU87T - Jul 20, 14:35 UTCJul 20, 15:25 UTC50m
2026-07-20 NDU87T - Jul 20, 12:25 UTCJul 20, 13:15 UTC50m
2026-07-18 NDU87T - Jul 18, 20:50 UTCJul 18, 21:30 UTC40m
2026-07-18 NDU87T - Jul 18, 18:55 UTCJul 18, 19:20 UTC25m
2026-07-18 NDU87T - Jul 18, 17:55 UTCJul 18, 18:05 UTC10m
2026-07-10 NDU87T - Jul 10, 20:20 UTCJul 10, 20:35 UTC15m
2026-07-09 NDU87T - Jul 9, 22:00 UTCJul 9, 22:15 UTC15m
2026-07-09 NDU87T - Jul 9, 18:50 UTCJul 9, 19:05 UTC15m
2026-07-09 NDU87T - Jul 9, 13:10 UTCJul 9, 14:25 UTC1h 15m
2026-07-09 NDU87T - Jul 9, 03:25 UTCJul 9, 05:00 UTC1h 35m
2026-07-08 NDU87T - Jul 8, 14:35 UTCJul 8, 15:00 UTC25m
2026-07-08 NDU87T - Jul 8, 03:45 UTCJul 8, 04:10 UTC25m
2026-07-07 NDU87T - Jul 7, 16:45 UTCJul 7, 17:15 UTC30m
2026-07-02 NDU87T - Jul 2, 16:20 UTCJul 2, 16:40 UTC20m
2026-07-02 NDU87T - Jul 2, 14:25 UTCJul 2, 14:45 UTC20m
2026-07-02 NDU87T - Jul 2, 03:35 UTCJul 2, 05:05 UTC1h 30m
2026-07-01 NDU87T - Jul 1, 20:20 UTCJul 1, 21:50 UTC1h 30m
2026-07-01 NDU87T - Jul 1, 18:30 UTCJul 1, 18:50 UTC20m
2026-07-01 NDU87T - Jul 1, 17:35 UTCJul 1, 17:55 UTC20m
2026-07-01 NDU87T - Jul 1, 15:30 UTCJul 1, 15:50 UTC20m
2026-06-30 NDU87T - Jun 30, 13:55 UTCJun 30, 14:35 UTC40m
2026-06-26 NDU87T - Jun 26, 21:45 UTCJun 26, 21:55 UTC10m
2026-06-26 NDU87T - Jun 26, 17:40 UTCJun 26, 18:09 UTC30m
2026-06-26 NDU87T - Jun 26, 14:09 UTCJun 26, 15:20 UTC1h 10m
2026-06-25 NDU87T - Jun 25, 21:20 UTCJun 25, 21:44 UTC25m
2026-06-22 NDU87T - Jun 22, 15:54 UTCJun 22, 16:05 UTC10m
2026-06-18 NDU87T - Jun 18, 19:25 UTCJun 18, 19:35 UTC10m
2026-06-18 NDU87T - Jun 18, 17:25 UTCJun 18, 17:40 UTC15m
2026-06-15 NDU87T - Jun 15, 16:35 UTCJun 15, 17:04 UTC30m
2026-06-15 NDU87T - Jun 15, 14:50 UTCJun 15, 15:10 UTC20m
2026-06-11 NDU87T - Jun 11, 05:05 UTCJun 11, 05:25 UTC20m
2026-06-11 NDU87T - Jun 11, 03:35 UTCJun 11, 04:00 UTC25m
2026-06-09 NDU87T - Jun 9, 14:00 UTCJun 9, 14:25 UTC25m
2026-06-08 NDU87T - Jun 8, 13:20 UTCJun 8, 13:45 UTC25m
2026-06-06 NDU87T - Jun 6, 15:50 UTCJun 6, 16:24 UTC35m
2026-06-05 NDU87T - Jun 5, 20:45 UTCJun 5, 21:00 UTC15m
2026-06-05 NDU87T - Jun 5, 03:45 UTCJun 5, 04:10 UTC25m
2026-06-05 NDU87T - Jun 5, 00:40 UTCJun 5, 01:15 UTC35m
2026-06-04 NDU87T - Jun 4, 23:20 UTCJun 4, 23:55 UTC35m
2026-06-04 NDU87T - Jun 4, 21:40 UTCJun 4, 22:00 UTC20m
2026-06-04 NDU87T - Jun 4, 15:25 UTCJun 4, 15:40 UTC15m
2026-06-03 NDU87T - Jun 3, 15:45 UTCJun 3, 16:20 UTC35m

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 N987ND page for operator, model, and routing details .

Mode-S ADC655 frequently asked

What is Mode-S code ADC655?
ADC655 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N987ND.
Where is Mode-S ADC655 registered?
Mode-S code ADC655 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 ADC655 broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADC655, octal 53343125, decimal 11,388,501.
What flights does ADC655 operate?
Mode-S ADC655 has broadcast 1 distinct callsign, including NDU87T.