Apparatus

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sensors Mode-S transponder

A85C8D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N638MF · AGUSTA AW-139 · operated by R O P AVIATION INC

Hex
A85C8D
Octal
52056215
Decimal
11,033,741
Country
US
Tail
N638MF
Type
A139
No current signal · last broadcast Jul 26, 16:25 UTC
Flights observed
59
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 16:25 UTC

Last known position

Most recent position reported by Mode-S A85C8D.

Country allocation

The ICAO 24-bit address A85C8D 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
N638MF - 59 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N638MF - Jul 26, 15:20 UTCJul 26, 16:25 UTC1h 5m
2026-07-26 N638MF - Jul 26, 12:45 UTCJul 26, 14:00 UTC1h 15m
2026-07-23 N638MF - Jul 23, 21:50 UTCJul 23, 22:30 UTC40m
2026-07-23 N638MF - Jul 23, 20:50 UTCJul 23, 21:05 UTC15m
2026-07-23 N638MF - Jul 23, 19:20 UTCJul 23, 19:45 UTC25m
2026-07-23 N638MF HTO → TSS Jul 23, 18:20 UTCJul 23, 19:00 UTC40m
2026-07-23 N638MF - Jul 23, 14:50 UTCJul 23, 15:30 UTC40m
2026-07-23 N638MF - Jul 23, 13:50 UTCJul 23, 14:00 UTC10m
2026-07-22 N638MF - Jul 22, 21:00 UTCJul 22, 21:25 UTC25m
2026-07-22 N638MF - Jul 22, 18:40 UTCJul 22, 19:05 UTC25m
2026-07-22 N638MF - Jul 22, 17:45 UTCJul 22, 17:55 UTC10m
2026-07-22 N638MF - Jul 22, 15:35 UTCJul 22, 16:50 UTC1h 15m
2026-07-22 N638MF - Jul 22, 14:40 UTCJul 22, 14:50 UTC10m
2026-07-20 N638MF - Jul 20, 21:50 UTCJul 20, 22:05 UTC15m
2026-07-20 N638MF - Jul 20, 21:05 UTCJul 20, 21:45 UTC40m
2026-07-20 N638MF - Jul 20, 14:35 UTCJul 20, 15:20 UTC45m
2026-07-20 N638MF HTO → TSS Jul 20, 13:40 UTCJul 20, 14:15 UTC35m
2026-07-17 N638MF - Jul 17, 16:04 UTCJul 17, 16:40 UTC35m
2026-07-17 N638MF - Jul 17, 15:20 UTCJul 17, 15:29 UTC10m
2026-07-13 N638MF TEB → MMU Jul 13, 14:00 UTCJul 13, 14:10 UTC10m
2026-07-13 N638MF HTO → TSS Jul 13, 13:10 UTCJul 13, 13:55 UTC45m
2026-07-12 N638MF - Jul 12, 23:20 UTCJul 12, 23:45 UTC25m
2026-07-12 N638MF - Jul 12, 15:10 UTCJul 12, 15:40 UTC30m
2026-07-10 N638MF - Jul 10, 15:40 UTCJul 10, 16:20 UTC40m
2026-07-10 N638MF - Jul 10, 14:25 UTCJul 10, 14:35 UTC10m
2026-07-05 N638MF HTO → MMU Jul 5, 18:45 UTCJul 5, 19:50 UTC1h 5m
2026-07-03 N638MF - Jul 3, 23:45 UTCJul 4, 00:20 UTC35m
2026-07-03 N638MF HTO → TSS Jul 3, 23:00 UTCJul 3, 23:40 UTC40m
2026-07-03 N638MF - Jul 3, 17:30 UTCJul 3, 18:05 UTC35m
2026-07-03 N638MF - Jul 3, 16:05 UTCJul 3, 16:20 UTC15m
2026-06-28 N638MF - Jun 28, 21:34 UTCJun 28, 22:34 UTC1h 0m
2026-06-26 N638MF - Jun 26, 17:59 UTCJun 26, 18:39 UTC40m
2026-06-26 N638MF - Jun 26, 16:39 UTCJun 26, 16:49 UTC10m
2026-06-21 N638MF HTO → MMU Jun 21, 16:30 UTCJun 21, 17:24 UTC55m
2026-06-19 N638MF - Jun 19, 19:09 UTCJun 19, 19:45 UTC35m
2026-06-19 N638MF - Jun 19, 17:19 UTCJun 19, 17:34 UTC15m
2026-06-14 N638MF HTO → MMU Jun 14, 15:40 UTCJun 14, 16:35 UTC55m
2026-06-12 N638MF - Jun 12, 19:00 UTCJun 12, 19:35 UTC35m
2026-06-12 N638MF - Jun 12, 15:35 UTCJun 12, 15:50 UTC15m
2026-06-07 N638MF - Jun 7, 12:25 UTCJun 7, 13:20 UTC55m
2026-06-05 N638MF - Jun 5, 17:35 UTCJun 5, 18:10 UTC35m
2026-06-05 N638MF - Jun 5, 17:15 UTCJun 5, 17:25 UTC10m
2026-05-25 N638MF - May 25, 20:30 UTCMay 25, 20:45 UTC15m
2026-05-25 N638MF - May 25, 19:50 UTCMay 25, 20:24 UTC35m
2026-05-21 N638MF - May 21, 18:50 UTCMay 21, 20:10 UTC1h 20m
2026-05-06 N638MF JFK → MMU May 6, 15:30 UTCMay 6, 15:55 UTC25m
2026-05-06 N638MF TSS → JFK May 6, 14:00 UTCMay 6, 14:05 UTC5m
2026-05-06 N638MF - May 6, 12:55 UTCMay 6, 13:10 UTC15m
2026-04-30 N638MF - Apr 30, 21:00 UTCApr 30, 21:25 UTC25m
2026-04-30 N638MF - Apr 30, 10:05 UTCApr 30, 10:20 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 N638MF page for operator, model, and routing details .

Mode-S A85C8D frequently asked

What is Mode-S code A85C8D?
A85C8D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N638MF.
Where is Mode-S A85C8D registered?
Mode-S code A85C8D 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 A85C8D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A85C8D, octal 52056215, decimal 11,033,741.
What flights does A85C8D operate?
Mode-S A85C8D has broadcast 1 distinct callsign, including N638MF.