Apparatus

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sensors Mode-S transponder

ACB90D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N919KT · ROBINSON R-44 Raven · operated by AIR ONE HELICOPTERS LLC

Hex
ACB90D
Octal
53134415
Decimal
11,319,565
Country
US
Tail
N919KT
Type
R44
No current signal · last broadcast Jul 21, 01:45 UTC
Flights observed
174
Distinct callsigns
1
Country
US
Last broadcast
Jul 21, 01:45 UTC

Last known position

Most recent position reported by Mode-S ACB90D.

Country allocation

The ICAO 24-bit address ACB90D 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
N919KT - 174 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 N919KT - Jul 21, 01:20 UTCJul 21, 01:45 UTC25m
2026-07-19 N919KT - Jul 19, 19:20 UTCJul 19, 19:30 UTC10m
2026-07-18 N919KT - Jul 18, 23:55 UTCJul 19, 00:20 UTC25m
2026-07-14 N919KT - Jul 14, 18:50 UTCJul 14, 19:15 UTC25m
2026-07-13 N919KT - Jul 13, 00:05 UTCJul 13, 00:25 UTC20m
2026-07-12 N919KT - Jul 12, 17:25 UTCJul 12, 17:50 UTC25m
2026-07-12 N919KT - Jul 12, 16:30 UTCJul 12, 16:45 UTC15m
2026-07-12 N919KT - Jul 12, 15:35 UTCJul 12, 15:50 UTC15m
2026-07-12 N919KT - Jul 12, 13:50 UTCJul 12, 14:10 UTC20m
2026-07-06 N919KT - Jul 6, 02:50 UTCJul 6, 03:40 UTC50m
2026-07-04 N919KT - Jul 4, 20:05 UTCJul 4, 20:50 UTC45m
2026-07-04 N919KT - Jul 4, 19:00 UTCJul 4, 19:10 UTC10m
2026-07-03 N919KT - Jul 3, 21:25 UTCJul 3, 21:35 UTC10m
2026-07-03 N919KT - Jul 3, 01:15 UTCJul 3, 01:40 UTC25m
2026-07-02 N919KT - Jul 2, 00:20 UTCJul 2, 00:50 UTC30m
2026-06-30 N919KT - Jun 30, 21:15 UTCJun 30, 21:30 UTC15m
2026-06-30 N919KT - Jun 30, 17:20 UTCJun 30, 17:30 UTC10m
2026-06-28 N919KT - Jun 28, 17:10 UTCJun 28, 17:30 UTC20m
2026-06-28 N919KT - Jun 28, 16:19 UTCJun 28, 16:35 UTC15m
2026-06-28 N919KT - Jun 28, 14:45 UTCJun 28, 15:24 UTC40m
2026-06-28 N919KT - Jun 28, 01:40 UTCJun 28, 02:10 UTC30m
2026-06-27 N919KT - Jun 27, 22:25 UTCJun 27, 22:35 UTC10m
2026-06-27 N919KT - Jun 27, 20:29 UTCJun 27, 20:39 UTC10m
2026-06-27 N919KT - Jun 27, 17:04 UTCJun 27, 17:44 UTC40m
2026-06-27 N919KT - Jun 27, 15:24 UTCJun 27, 15:34 UTC10m
2026-06-26 N919KT - Jun 26, 21:15 UTCJun 26, 21:24 UTC10m
2026-06-26 N919KT - Jun 26, 20:29 UTCJun 26, 20:40 UTC10m
2026-06-25 N919KT - Jun 25, 23:59 UTCJun 26, 00:24 UTC25m
2026-06-24 N919KT - Jun 24, 23:59 UTCJun 25, 00:29 UTC30m
2026-06-24 N919KT - Jun 24, 22:45 UTCJun 24, 23:24 UTC40m
2026-06-22 N919KT - Jun 22, 01:00 UTCJun 22, 01:15 UTC15m
2026-06-22 N919KT - Jun 22, 00:14 UTCJun 22, 00:29 UTC15m
2026-06-21 N919KT - Jun 21, 23:34 UTCJun 21, 23:44 UTC10m
2026-06-21 N919KT - Jun 21, 22:10 UTCJun 21, 22:54 UTC45m
2026-06-21 N919KT - Jun 21, 19:09 UTCJun 21, 19:20 UTC10m
2026-06-21 N919KT - Jun 21, 17:45 UTCJun 21, 18:04 UTC20m
2026-06-21 N919KT - Jun 21, 00:49 UTCJun 21, 02:04 UTC1h 15m
2026-06-20 N919KT - Jun 20, 21:30 UTCJun 20, 21:40 UTC10m
2026-06-19 N919KT - Jun 19, 18:54 UTCJun 19, 19:04 UTC10m
2026-06-19 N919KT - Jun 19, 17:29 UTCJun 19, 17:39 UTC10m
2026-06-19 N919KT - Jun 19, 16:19 UTCJun 19, 16:44 UTC25m
2026-06-19 N919KT - Jun 19, 14:59 UTCJun 19, 15:29 UTC30m
2026-06-19 N919KT - Jun 19, 13:24 UTCJun 19, 13:44 UTC20m
2026-06-18 N919KT - Jun 18, 22:10 UTCJun 18, 22:20 UTC10m
2026-06-18 N919KT - Jun 18, 19:20 UTCJun 18, 19:30 UTC10m
2026-06-15 N919KT - Jun 15, 15:50 UTCJun 15, 15:59 UTC10m
2026-06-14 N919KT - Jun 14, 00:00 UTCJun 14, 00:30 UTC30m
2026-06-13 N919KT - Jun 13, 21:35 UTCJun 13, 22:45 UTC1h 10m
2026-06-13 N919KT - Jun 13, 20:05 UTCJun 13, 20:15 UTC10m
2026-06-13 N919KT - Jun 13, 17:10 UTCJun 13, 18:20 UTC1h 10m

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 N919KT page for operator, model, and routing details .

Mode-S ACB90D frequently asked

What is Mode-S code ACB90D?
ACB90D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N919KT.
Where is Mode-S ACB90D registered?
Mode-S code ACB90D 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 ACB90D broadcasting right now?
No active broadcast right now. Last signal was Jul 21, 01:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACB90D, octal 53134415, decimal 11,319,565.
What flights does ACB90D operate?
Mode-S ACB90D has broadcast 1 distinct callsign, including N919KT.