Apparatus

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sensors Mode-S transponder

A4DD1B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N412RX · AIRBUS HELICOPTERS EC-130 · operated by TVPX AIRCRAFT SOLUTIONS INC TRUSTEE

Hex
A4DD1B
Octal
51156433
Decimal
10,804,507
Country
US
Tail
N412RX
Type
EC30
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
330
Distinct callsigns
3
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A4DD1B.

Country allocation

The ICAO 24-bit address A4DD1B 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 3 distinct

Callsign Airline Flights Last seen
REH6 - 301 2026-07-26
REH98 - 21 2026-06-06
REH92 - 8 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 REH6 - Jul 26, 21:15 UTCJul 26, 21:30 UTC15m
2026-07-26 REH6 - Jul 26, 20:15 UTCJul 26, 20:25 UTC10m
2026-07-26 REH6 - Jul 26, 07:40 UTCJul 26, 09:15 UTC1h 35m
2026-07-26 REH6 - Jul 26, 03:25 UTCJul 26, 04:05 UTC40m
2026-07-26 REH6 - Jul 26, 02:10 UTCJul 26, 02:45 UTC35m
2026-07-26 REH6 - Jul 26, 01:05 UTCJul 26, 01:25 UTC20m
2026-07-25 REH6 - Jul 25, 19:50 UTCJul 25, 20:35 UTC45m
2026-07-25 REH6 - Jul 25, 17:35 UTCJul 25, 18:20 UTC45m
2026-07-25 REH6 - Jul 25, 12:50 UTCJul 25, 13:40 UTC50m
2026-07-25 REH6 - Jul 25, 08:00 UTCJul 25, 08:10 UTC10m
2026-07-25 REH6 - Jul 25, 07:15 UTCJul 25, 07:25 UTC10m
2026-07-25 REH6 - Jul 25, 02:05 UTCJul 25, 02:35 UTC30m
2026-07-24 REH6 - Jul 24, 21:05 UTCJul 24, 21:20 UTC15m
2026-07-24 REH6 - Jul 24, 19:55 UTCJul 24, 20:35 UTC40m
2026-07-24 REH6 - Jul 24, 18:55 UTCJul 24, 19:25 UTC30m
2026-07-24 REH6 - Jul 24, 17:55 UTCJul 24, 18:10 UTC15m
2026-07-24 REH6 - Jul 24, 06:45 UTCJul 24, 07:40 UTC55m
2026-07-23 REH6 - Jul 23, 23:15 UTCJul 23, 23:25 UTC10m
2026-07-23 REH6 - Jul 23, 04:15 UTCJul 23, 05:00 UTC45m
2026-07-23 REH6 - Jul 23, 02:55 UTCJul 23, 03:35 UTC40m
2026-07-22 REH6 - Jul 22, 23:25 UTCJul 22, 23:35 UTC10m
2026-07-22 REH6 - Jul 22, 04:40 UTCJul 22, 04:55 UTC15m
2026-07-22 REH6 - Jul 22, 03:35 UTCJul 22, 03:45 UTC10m
2026-07-22 REH6 - Jul 22, 01:15 UTCJul 22, 01:40 UTC25m
2026-07-21 REH6 - Jul 21, 21:55 UTCJul 21, 22:15 UTC20m
2026-07-21 REH6 - Jul 21, 19:20 UTCJul 21, 19:30 UTC10m
2026-07-21 REH6 - Jul 21, 18:20 UTCJul 21, 18:30 UTC10m
2026-07-21 REH6 - Jul 21, 13:20 UTCJul 21, 13:45 UTC25m
2026-07-21 REH6 - Jul 21, 12:20 UTCJul 21, 12:45 UTC25m
2026-07-21 REH6 - Jul 21, 04:30 UTCJul 21, 04:40 UTC10m
2026-07-21 REH6 - Jul 21, 03:35 UTCJul 21, 03:50 UTC15m
2026-07-21 REH6 - Jul 21, 00:35 UTCJul 21, 01:15 UTC40m
2026-07-20 REH6 - Jul 20, 22:10 UTCJul 20, 22:20 UTC10m
2026-07-20 REH6 - Jul 20, 21:05 UTCJul 20, 21:30 UTC25m
2026-07-20 REH6 - Jul 20, 19:50 UTCJul 20, 20:05 UTC15m
2026-07-20 REH6 - Jul 20, 04:05 UTCJul 20, 04:20 UTC15m
2026-07-19 REH6 - Jul 19, 22:15 UTCJul 19, 22:50 UTC35m
2026-07-19 REH6 - Jul 19, 19:05 UTCJul 19, 20:00 UTC55m
2026-07-19 REH6 - Jul 19, 16:30 UTCJul 19, 17:40 UTC1h 10m
2026-07-19 REH6 - Jul 19, 15:15 UTCJul 19, 15:40 UTC25m
2026-07-19 REH6 - Jul 19, 02:30 UTCJul 19, 02:40 UTC10m
2026-07-18 REH6 - Jul 18, 05:55 UTCJul 18, 06:20 UTC25m
2026-07-18 REH6 - Jul 18, 04:25 UTCJul 18, 04:35 UTC10m
2026-07-18 REH6 - Jul 18, 01:45 UTCJul 18, 02:19 UTC35m
2026-07-18 REH6 - Jul 18, 00:04 UTCJul 18, 00:35 UTC30m
2026-07-17 REH6 - Jul 17, 22:29 UTCJul 17, 22:49 UTC20m
2026-07-17 REH6 - Jul 17, 21:00 UTCJul 17, 21:34 UTC35m
2026-07-17 REH6 - Jul 17, 19:55 UTCJul 17, 20:04 UTC10m
2026-07-17 REH6 - Jul 17, 18:15 UTCJul 17, 18:55 UTC40m
2026-07-17 REH6 - Jul 17, 16:29 UTCJul 17, 16:40 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 N412RX page for operator, model, and routing details .

Mode-S A4DD1B frequently asked

What is Mode-S code A4DD1B?
A4DD1B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N412RX.
Where is Mode-S A4DD1B registered?
Mode-S code A4DD1B 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 A4DD1B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4DD1B, octal 51156433, decimal 10,804,507.
What flights does A4DD1B operate?
Mode-S A4DD1B has broadcast 3 distinct callsigns, including REH6, REH98, REH92.