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sensors Mode-S transponder

AC6431

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N898MT · AIRBUS HELICOPTERS EC-135/635 · operated by TVPX AIRCRAFT SOLUTIONS INC TRUSTEE

Hex
AC6431
Octal
53062061
Decimal
11,297,841
Country
US
Tail
N898MT
Type
EC35
No current signal · last broadcast 5h ago
Flights observed
157
Distinct callsigns
1
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S AC6431.

Country allocation

The ICAO 24-bit address AC6431 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
N898MT - 157 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 N898MT - Jul 18, 06:45 UTCJul 18, 07:45 UTC1h 0m
2026-07-18 N898MT - Jul 18, 05:35 UTCJul 18, 06:15 UTC40m
2026-07-18 N898MT - Jul 18, 02:29 UTCJul 18, 03:05 UTC36m
2026-07-18 N898MT - Jul 18, 00:39 UTCJul 18, 01:54 UTC1h 15m
2026-07-17 N898MT - Jul 17, 18:05 UTCJul 17, 18:10 UTC5m
2026-07-16 N898MT - Jul 16, 08:00 UTCJul 16, 08:45 UTC45m
2026-07-16 N898MT - Jul 16, 07:00 UTCJul 16, 07:20 UTC20m
2026-07-15 N898MT - Jul 15, 18:40 UTCJul 15, 18:50 UTC10m
2026-07-11 N898MT - Jul 11, 00:25 UTCJul 11, 00:45 UTC20m
2026-06-28 N898MT - Jun 28, 21:34 UTCJun 28, 23:50 UTC2h 15m
2026-06-28 N898MT - Jun 28, 18:05 UTCJun 28, 19:49 UTC1h 45m
2026-06-28 N898MT - Jun 28, 11:00 UTCJun 28, 11:39 UTC40m
2026-06-28 N898MT - Jun 28, 09:20 UTCJun 28, 09:55 UTC35m
2026-06-28 N898MT - Jun 28, 00:59 UTCJun 28, 01:50 UTC50m
2026-06-27 N898MT - Jun 27, 23:50 UTCJun 28, 00:09 UTC20m
2026-06-27 N898MT - Jun 27, 21:50 UTCJun 27, 22:35 UTC45m
2026-06-27 N898MT - Jun 27, 20:19 UTCJun 27, 21:15 UTC55m
2026-06-27 N898MT - Jun 27, 15:55 UTCJun 27, 16:39 UTC45m
2026-06-27 N898MT - Jun 27, 14:29 UTCJun 27, 15:19 UTC50m
2026-06-27 N898MT - Jun 27, 06:59 UTCJun 27, 07:24 UTC25m
2026-06-27 N898MT - Jun 27, 05:10 UTCJun 27, 05:35 UTC25m
2026-06-27 N898MT - Jun 27, 02:25 UTCJun 27, 03:25 UTC1h 0m
2026-06-26 N898MT - Jun 26, 22:14 UTCJun 26, 22:34 UTC20m
2026-06-26 N898MT - Jun 26, 11:55 UTCJun 26, 12:29 UTC35m
2026-06-26 N898MT - Jun 26, 07:39 UTCJun 26, 09:14 UTC1h 35m
2026-06-26 N898MT CLL → CLL Jun 26, 02:30 UTCJun 26, 03:24 UTC55m
2026-06-19 N898MT - Jun 19, 08:40 UTCJun 19, 09:19 UTC40m
2026-06-19 N898MT - Jun 19, 07:59 UTCJun 19, 08:09 UTC10m
2026-06-19 N898MT - Jun 19, 06:39 UTCJun 19, 07:14 UTC35m
2026-06-19 N898MT - Jun 19, 03:20 UTCJun 19, 04:00 UTC40m
2026-06-19 N898MT - Jun 19, 02:24 UTCJun 19, 02:45 UTC20m
2026-06-18 N898MT - Jun 18, 20:45 UTCJun 18, 21:35 UTC50m
2026-06-18 N898MT - Jun 18, 19:50 UTCJun 18, 20:40 UTC50m
2026-06-18 N898MT - Jun 18, 03:50 UTCJun 18, 04:15 UTC25m
2026-06-18 N898MT - Jun 18, 01:55 UTCJun 18, 02:45 UTC50m
2026-06-17 N898MT - Jun 17, 22:45 UTCJun 18, 00:30 UTC1h 45m
2026-06-15 N898MT - Jun 15, 02:55 UTCJun 15, 03:24 UTC30m
2026-06-15 N898MT - Jun 15, 00:55 UTCJun 15, 02:04 UTC1h 10m
2026-06-14 N898MT - Jun 14, 06:40 UTCJun 14, 08:45 UTC2h 5m
2026-06-14 N898MT - Jun 14, 04:25 UTCJun 14, 05:15 UTC50m
2026-06-13 N898MT - Jun 13, 20:10 UTCJun 13, 20:30 UTC20m
2026-06-12 N898MT - Jun 12, 01:35 UTCJun 12, 02:15 UTC40m
2026-06-12 N898MT - Jun 12, 00:25 UTCJun 12, 00:50 UTC26m
2026-06-10 N898MT - Jun 10, 22:05 UTCJun 10, 22:35 UTC30m
2026-06-10 N898MT - Jun 10, 21:05 UTCJun 10, 21:25 UTC20m
2026-06-10 N898MT - Jun 10, 08:40 UTCJun 10, 09:10 UTC30m
2026-06-09 N898MT - Jun 9, 22:25 UTCJun 9, 23:30 UTC1h 5m
2026-06-09 N898MT - Jun 9, 21:30 UTCJun 9, 21:55 UTC25m
2026-06-08 N898MT - Jun 8, 21:25 UTCJun 8, 21:50 UTC25m
2026-06-07 N898MT - Jun 7, 17:05 UTCJun 7, 17:15 UTC10m

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 N898MT page for operator, model, and routing details .

Mode-S AC6431 frequently asked

What is Mode-S code AC6431?
AC6431 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N898MT.
Where is Mode-S AC6431 registered?
Mode-S code AC6431 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 AC6431 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC6431, octal 53062061, decimal 11,297,841.
What flights does AC6431 operate?
Mode-S AC6431 has broadcast 1 distinct callsign, including N898MT.