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sensors Mode-S transponder

A08EF0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N135N · AIRBUS HELICOPTERS EC-135/635 · operated by MH HOSPITAL MANAGER LLC

Hex
A08EF0
Octal
50107360
Decimal
10,522,352
Country
US
Tail
N135N
Type
EC35
No current signal · last broadcast Jul 7, 17:25 UTC
Flights observed
129
Distinct callsigns
1
Country
US
Last broadcast
Jul 7, 17:25 UTC

Last known position

Most recent position reported by Mode-S A08EF0.

Country allocation

The ICAO 24-bit address A08EF0 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
N135N - 129 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-07 N135N - Jul 7, 17:15 UTCJul 7, 17:25 UTC10m
2026-06-30 N135N - Jun 30, 12:30 UTCJun 30, 12:45 UTC15m
2026-06-29 N135N - Jun 29, 16:15 UTCJun 29, 16:25 UTC10m
2026-06-29 N135N - Jun 29, 15:45 UTCJun 29, 15:54 UTC10m
2026-06-29 N135N - Jun 29, 04:25 UTCJun 29, 05:04 UTC40m
2026-06-29 N135N - Jun 29, 01:50 UTCJun 29, 02:05 UTC15m
2026-06-29 N135N - Jun 29, 00:49 UTCJun 29, 01:05 UTC15m
2026-06-27 N135N - Jun 27, 15:30 UTCJun 27, 15:39 UTC10m
2026-06-26 N135N - Jun 26, 22:29 UTCJun 26, 22:40 UTC10m
2026-06-26 N135N - Jun 26, 21:24 UTCJun 26, 21:39 UTC15m
2026-06-26 N135N - Jun 26, 13:19 UTCJun 26, 13:40 UTC20m
2026-06-25 N135N - Jun 25, 23:55 UTCJun 26, 00:24 UTC30m
2026-06-25 N135N - Jun 25, 21:50 UTCJun 25, 22:39 UTC50m
2026-06-25 N135N - Jun 25, 20:19 UTCJun 25, 20:49 UTC30m
2026-06-25 N135N - Jun 25, 18:59 UTCJun 25, 19:39 UTC40m
2026-06-25 N135N - Jun 25, 18:00 UTCJun 25, 18:24 UTC25m
2026-06-25 N135N - Jun 25, 13:05 UTCJun 25, 13:20 UTC15m
2026-06-25 N135N - Jun 25, 12:19 UTCJun 25, 12:30 UTC10m
2026-06-25 N135N - Jun 25, 06:25 UTCJun 25, 08:45 UTC2h 20m
2026-06-25 N135N - Jun 25, 05:05 UTCJun 25, 05:44 UTC40m
2026-06-25 N135N - Jun 25, 01:50 UTCJun 25, 02:30 UTC40m
2026-06-24 N135N - Jun 24, 04:05 UTCJun 24, 04:15 UTC10m
2026-06-24 N135N - Jun 24, 03:15 UTCJun 24, 03:29 UTC15m
2026-06-22 N135N - Jun 22, 19:00 UTCJun 22, 19:29 UTC30m
2026-06-22 N135N - Jun 22, 17:55 UTCJun 22, 18:04 UTC10m
2026-06-21 N135N - Jun 21, 00:40 UTCJun 21, 01:39 UTC1h 0m
2026-06-20 N135N - Jun 20, 14:44 UTCJun 20, 14:59 UTC15m
2026-06-16 N135N - Jun 16, 03:15 UTCJun 16, 03:55 UTC40m
2026-06-16 N135N - Jun 16, 02:04 UTCJun 16, 02:20 UTC15m
2026-06-15 N135N - Jun 15, 12:00 UTCJun 15, 12:10 UTC10m
2026-06-13 N135N - Jun 13, 12:55 UTCJun 13, 13:05 UTC10m
2026-06-12 N135N - Jun 12, 13:30 UTCJun 12, 13:40 UTC10m
2026-06-12 N135N - Jun 12, 02:00 UTCJun 12, 02:15 UTC15m
2026-06-12 N135N - Jun 12, 00:25 UTCJun 12, 00:45 UTC21m
2026-06-11 N135N - Jun 11, 17:30 UTCJun 11, 17:50 UTC20m
2026-06-11 N135N - Jun 11, 16:25 UTCJun 11, 16:50 UTC25m
2026-06-11 N135N - Jun 11, 15:20 UTCJun 11, 15:50 UTC30m
2026-06-11 N135N - Jun 11, 02:55 UTCJun 11, 03:35 UTC40m
2026-06-10 N135N - Jun 10, 23:05 UTCJun 11, 00:10 UTC1h 5m
2026-06-10 N135N - Jun 10, 17:20 UTCJun 10, 17:50 UTC30m
2026-06-08 N135N - Jun 8, 04:40 UTCJun 8, 04:50 UTC10m
2026-06-07 N135N - Jun 7, 20:20 UTCJun 7, 20:50 UTC30m
2026-06-07 N135N - Jun 7, 19:10 UTCJun 7, 19:45 UTC35m
2026-06-07 N135N - Jun 7, 12:25 UTCJun 7, 13:20 UTC55m
2026-06-05 N135N - Jun 5, 18:25 UTCJun 5, 18:35 UTC10m
2026-06-05 N135N - Jun 5, 02:35 UTCJun 5, 02:45 UTC10m
2026-06-05 N135N - Jun 5, 00:45 UTCJun 5, 01:15 UTC30m
2026-06-04 N135N - Jun 4, 23:35 UTCJun 4, 23:45 UTC10m
2026-06-04 N135N - Jun 4, 12:50 UTCJun 4, 13:05 UTC15m
2026-06-04 N135N - Jun 4, 11:55 UTCJun 4, 12:10 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 N135N page for operator, model, and routing details .

Mode-S A08EF0 frequently asked

What is Mode-S code A08EF0?
A08EF0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N135N.
Where is Mode-S A08EF0 registered?
Mode-S code A08EF0 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 A08EF0 broadcasting right now?
No active broadcast right now. Last signal was Jul 7, 17:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A08EF0, octal 50107360, decimal 10,522,352.
What flights does A08EF0 operate?
Mode-S A08EF0 has broadcast 1 distinct callsign, including N135N.