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sensors Mode-S transponder

A55D8E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N445DU · AIRBUS HELICOPTERS EC-145 · operated by METRO AVIATION INC

Hex
A55D8E
Octal
51256616
Decimal
10,837,390
Country
US
Tail
N445DU
Type
EC45
No current signal · last broadcast Jul 22, 18:55 UTC
Flights observed
295
Distinct callsigns
1
Country
US
Last broadcast
Jul 22, 18:55 UTC

Last known position

Most recent position reported by Mode-S A55D8E.

Country allocation

The ICAO 24-bit address A55D8E 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
N445DU - 295 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 N445DU - Jul 22, 17:35 UTCJul 22, 18:55 UTC1h 20m
2026-07-10 N445DU - Jul 10, 06:00 UTCJul 10, 07:30 UTC1h 30m
2026-07-10 N445DU - Jul 10, 04:10 UTCJul 10, 04:50 UTC40m
2026-07-09 N445DU - Jul 9, 23:05 UTCJul 10, 00:55 UTC1h 50m
2026-07-09 N445DU - Jul 9, 16:40 UTCJul 9, 17:00 UTC20m
2026-07-09 N445DU - Jul 9, 14:20 UTCJul 9, 15:45 UTC1h 25m
2026-07-07 N445DU - Jul 7, 17:20 UTCJul 7, 17:40 UTC20m
2026-07-07 N445DU - Jul 7, 15:40 UTCJul 7, 16:05 UTC25m
2026-07-07 N445DU - Jul 7, 13:05 UTCJul 7, 13:15 UTC10m
2026-07-07 N445DU - Jul 7, 05:05 UTCJul 7, 05:25 UTC20m
2026-07-06 N445DU - Jul 6, 18:35 UTCJul 6, 18:50 UTC15m
2026-07-06 N445DU - Jul 6, 16:40 UTCJul 6, 17:10 UTC30m
2026-07-06 N445DU - Jul 6, 15:00 UTCJul 6, 15:25 UTC25m
2026-07-05 N445DU - Jul 5, 16:45 UTCJul 5, 17:05 UTC20m
2026-07-05 N445DU - Jul 5, 15:35 UTCJul 5, 16:05 UTC30m
2026-07-05 N445DU - Jul 5, 14:15 UTCJul 5, 14:45 UTC30m
2026-07-05 N445DU - Jul 5, 13:25 UTCJul 5, 13:45 UTC20m
2026-07-05 N445DU - Jul 5, 08:15 UTCJul 5, 08:35 UTC20m
2026-07-05 N445DU - Jul 5, 07:15 UTCJul 5, 07:40 UTC25m
2026-07-05 N445DU - Jul 5, 05:35 UTCJul 5, 06:15 UTC40m
2026-07-05 N445DU - Jul 5, 03:20 UTCJul 5, 03:40 UTC20m
2026-07-05 N445DU - Jul 5, 01:35 UTCJul 5, 02:30 UTC55m
2026-07-05 N445DU - Jul 5, 00:20 UTCJul 5, 00:40 UTC20m
2026-07-04 N445DU - Jul 4, 23:25 UTCJul 4, 23:40 UTC15m
2026-07-04 N445DU - Jul 4, 22:15 UTCJul 4, 22:40 UTC25m
2026-07-04 N445DU - Jul 4, 04:50 UTCJul 4, 05:55 UTC1h 5m
2026-07-04 N445DU - Jul 4, 02:10 UTCJul 4, 04:15 UTC2h 5m
2026-07-04 N445DU - Jul 4, 00:35 UTCJul 4, 00:50 UTC15m
2026-07-03 N445DU - Jul 3, 23:35 UTCJul 3, 23:55 UTC20m
2026-07-03 N445DU - Jul 3, 22:50 UTCJul 3, 23:05 UTC15m
2026-07-03 N445DU - Jul 3, 16:10 UTCJul 3, 16:30 UTC20m
2026-07-03 N445DU - Jul 3, 07:10 UTCJul 3, 07:30 UTC20m
2026-07-03 N445DU - Jul 3, 05:55 UTCJul 3, 06:35 UTC40m
2026-07-03 N445DU - Jul 3, 04:40 UTCJul 3, 05:05 UTC25m
2026-07-03 N445DU - Jul 3, 03:25 UTCJul 3, 03:45 UTC20m
2026-07-03 N445DU - Jul 3, 02:20 UTCJul 3, 02:45 UTC25m
2026-07-03 N445DU - Jul 3, 01:20 UTCJul 3, 01:45 UTC25m
2026-07-01 N445DU - Jul 1, 16:40 UTCJul 1, 17:00 UTC20m
2026-07-01 N445DU - Jul 1, 15:20 UTCJul 1, 15:40 UTC20m
2026-07-01 N445DU - Jul 1, 13:55 UTCJul 1, 14:25 UTC30m
2026-06-30 N445DU - Jun 30, 23:00 UTCJun 30, 23:20 UTC20m
2026-06-30 N445DU - Jun 30, 22:10 UTCJun 30, 22:20 UTC10m
2026-06-30 N445DU - Jun 30, 20:50 UTCJun 30, 21:15 UTC25m
2026-06-30 N445DU - Jun 30, 04:00 UTCJun 30, 04:25 UTC25m
2026-06-30 N445DU - Jun 30, 02:55 UTCJun 30, 03:10 UTC15m
2026-06-30 N445DU - Jun 30, 00:25 UTCJun 30, 01:04 UTC40m
2026-06-29 N445DU - Jun 29, 23:09 UTCJun 29, 23:25 UTC15m
2026-06-29 N445DU - Jun 29, 22:10 UTCJun 29, 22:30 UTC20m
2026-06-28 N445DU - Jun 28, 19:04 UTCJun 28, 19:34 UTC30m
2026-06-28 N445DU - Jun 28, 06:55 UTCJun 28, 07:09 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 N445DU page for operator, model, and routing details .

Mode-S A55D8E frequently asked

What is Mode-S code A55D8E?
A55D8E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N445DU.
Where is Mode-S A55D8E registered?
Mode-S code A55D8E 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 A55D8E broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 18:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A55D8E, octal 51256616, decimal 10,837,390.
What flights does A55D8E operate?
Mode-S A55D8E has broadcast 1 distinct callsign, including N445DU.