Apparatus

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sensors Mode-S transponder

A535BB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N435AK · AGUSTA AW-109 Grand · operated by HELINET AVIATION SERVICES LLC

Hex
A535BB
Octal
51232673
Decimal
10,827,195
Country
US
Tail
N435AK
Type
A109
No current signal · last broadcast Jul 26, 11:00 UTC
Flights observed
103
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 11:00 UTC

Last known position

Most recent position reported by Mode-S A535BB.

Country allocation

The ICAO 24-bit address A535BB 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
N435AK - 103 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N435AK - Jul 26, 10:35 UTCJul 26, 11:00 UTC25m
2026-07-26 N435AK - Jul 26, 03:30 UTCJul 26, 03:50 UTC20m
2026-07-24 N435AK - Jul 24, 19:30 UTCJul 24, 19:45 UTC15m
2026-07-23 N435AK - Jul 23, 09:35 UTCJul 23, 10:25 UTC50m
2026-07-23 N435AK - Jul 23, 05:25 UTCJul 23, 06:20 UTC55m
2026-07-23 N435AK - Jul 23, 02:20 UTCJul 23, 02:45 UTC25m
2026-07-22 N435AK - Jul 22, 19:20 UTCJul 22, 19:55 UTC35m
2026-07-22 N435AK - Jul 22, 18:40 UTCJul 22, 18:50 UTC10m
2026-07-20 N435AK - Jul 20, 13:30 UTCJul 20, 14:05 UTC35m
2026-07-20 N435AK - Jul 20, 12:40 UTCJul 20, 12:50 UTC10m
2026-07-20 N435AK - Jul 20, 01:55 UTCJul 20, 02:30 UTC35m
2026-07-20 N435AK - Jul 20, 00:05 UTCJul 20, 00:35 UTC30m
2026-07-19 N435AK - Jul 19, 23:05 UTCJul 19, 23:15 UTC10m
2026-07-19 N435AK - Jul 19, 08:35 UTCJul 19, 09:05 UTC30m
2026-07-19 N435AK - Jul 19, 04:15 UTCJul 19, 04:55 UTC40m
2026-07-19 N435AK - Jul 19, 03:05 UTCJul 19, 03:30 UTC25m
2026-07-17 N435AK - Jul 17, 02:30 UTCJul 17, 03:10 UTC40m
2026-07-17 N435AK - Jul 17, 01:45 UTCJul 17, 01:55 UTC10m
2026-07-14 N435AK - Jul 14, 22:10 UTCJul 14, 23:25 UTC1h 14m
2026-07-14 N435AK - Jul 14, 18:35 UTCJul 14, 19:50 UTC1h 15m
2026-07-09 N435AK - Jul 9, 21:10 UTCJul 9, 21:20 UTC10m
2026-07-09 N435AK - Jul 9, 19:45 UTCJul 9, 20:35 UTC50m
2026-07-09 N435AK - Jul 9, 05:45 UTCJul 9, 06:45 UTC1h 0m
2026-07-09 N435AK - Jul 9, 00:35 UTCJul 9, 01:05 UTC30m
2026-07-06 N435AK - Jul 6, 10:20 UTCJul 6, 11:25 UTC1h 5m
2026-07-06 N435AK VNY → VNY Jul 6, 03:55 UTCJul 6, 04:55 UTC1h 0m
2026-07-06 N435AK - Jul 6, 02:45 UTCJul 6, 03:10 UTC25m
2026-07-05 N435AK - Jul 5, 04:40 UTCJul 5, 05:45 UTC1h 5m
2026-07-04 N435AK - Jul 4, 04:20 UTCJul 4, 04:45 UTC25m
2026-07-04 N435AK - Jul 4, 03:40 UTCJul 4, 03:50 UTC10m
2026-07-03 N435AK - Jul 3, 18:25 UTCJul 3, 19:20 UTC55m
2026-07-03 N435AK - Jul 3, 02:35 UTCJul 3, 03:30 UTC55m
2026-07-02 N435AK - Jul 2, 19:10 UTCJul 2, 19:40 UTC30m
2026-07-02 N435AK - Jul 2, 18:25 UTCJul 2, 18:35 UTC10m
2026-07-01 N435AK - Jul 1, 22:45 UTCJul 1, 23:25 UTC40m
2026-07-01 N435AK - Jul 1, 04:40 UTCJul 1, 05:35 UTC55m
2026-07-01 N435AK - Jul 1, 01:25 UTCJul 1, 02:30 UTC1h 5m
2026-06-28 N435AK - Jun 28, 07:44 UTCJun 28, 08:19 UTC35m
2026-06-28 N435AK - Jun 28, 03:19 UTCJun 28, 03:59 UTC40m
2026-06-26 N435AK - Jun 26, 01:34 UTCJun 26, 02:44 UTC1h 10m
2026-06-23 N435AK - Jun 23, 21:49 UTCJun 23, 22:34 UTC45m
2026-06-20 N435AK - Jun 20, 01:05 UTCJun 20, 01:29 UTC25m
2026-06-20 N435AK VNY → BUR Jun 20, 00:24 UTCJun 20, 00:34 UTC10m
2026-06-16 N435AK - Jun 16, 21:15 UTCJun 16, 21:25 UTC10m
2026-06-15 N435AK - Jun 15, 13:40 UTCJun 15, 14:30 UTC50m
2026-06-15 N435AK - Jun 15, 03:55 UTCJun 15, 04:45 UTC50m
2026-06-14 N435AK - Jun 14, 20:20 UTCJun 14, 20:45 UTC25m
2026-06-14 N435AK - Jun 14, 19:10 UTCJun 14, 19:20 UTC10m
2026-06-14 N435AK - Jun 14, 00:50 UTCJun 14, 02:00 UTC1h 10m
2026-06-13 N435AK - Jun 13, 20:30 UTCJun 13, 21:15 UTC45m

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 N435AK page for operator, model, and routing details .

Mode-S A535BB frequently asked

What is Mode-S code A535BB?
A535BB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N435AK.
Where is Mode-S A535BB registered?
Mode-S code A535BB 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 A535BB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 11:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A535BB, octal 51232673, decimal 10,827,195.
What flights does A535BB operate?
Mode-S A535BB has broadcast 1 distinct callsign, including N435AK.