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 7h ago
Flights observed
185
Distinct callsigns
3
Country
US
Last broadcast
7h ago

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 - 156 2026-06-29
REH98 - 21 2026-06-06
REH92 - 8 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-29 REH6 - Jun 29, 08:24 UTCJun 29, 08:35 UTC10m
2026-06-29 REH6 - Jun 29, 06:50 UTCJun 29, 06:59 UTC10m
2026-06-29 REH6 - Jun 29, 05:00 UTCJun 29, 05:09 UTC10m
2026-06-29 REH6 - Jun 29, 04:00 UTCJun 29, 04:09 UTC10m
2026-06-28 REH6 - Jun 28, 22:04 UTCJun 28, 22:49 UTC45m
2026-06-28 REH6 - Jun 28, 20:34 UTCJun 28, 20:45 UTC10m
2026-06-28 REH6 - Jun 28, 05:24 UTCJun 28, 05:40 UTC15m
2026-06-28 REH6 - Jun 28, 04:25 UTCJun 28, 04:40 UTC15m
2026-06-27 REH6 - Jun 27, 00:14 UTCJun 27, 00:25 UTC10m
2026-06-26 REH6 - Jun 26, 20:59 UTCJun 26, 21:10 UTC10m
2026-06-26 REH6 - Jun 26, 19:50 UTCJun 26, 20:00 UTC10m
2026-06-26 REH6 - Jun 26, 11:55 UTCJun 26, 12:10 UTC15m
2026-06-26 REH6 - Jun 26, 11:09 UTCJun 26, 11:20 UTC10m
2026-06-26 REH6 - Jun 26, 01:45 UTCJun 26, 02:00 UTC15m
2026-06-26 REH6 - Jun 26, 00:35 UTCJun 26, 01:10 UTC35m
2026-06-25 REH6 - Jun 25, 21:29 UTCJun 25, 21:44 UTC15m
2026-06-25 REH6 - Jun 25, 03:10 UTCJun 25, 03:40 UTC30m
2026-06-24 REH6 - Jun 24, 20:30 UTCJun 24, 20:40 UTC10m
2026-06-24 REH6 - Jun 24, 06:04 UTCJun 24, 06:15 UTC10m
2026-06-24 REH6 - Jun 24, 02:45 UTCJun 24, 03:24 UTC40m
2026-06-24 REH6 - Jun 24, 00:59 UTCJun 24, 01:39 UTC40m
2026-06-23 REH6 - Jun 23, 04:45 UTCJun 23, 05:24 UTC40m
2026-06-23 REH6 - Jun 23, 03:34 UTCJun 23, 04:09 UTC35m
2026-06-23 REH6 - Jun 23, 02:15 UTCJun 23, 02:29 UTC15m
2026-06-21 REH6 - Jun 21, 23:24 UTCJun 21, 23:34 UTC10m
2026-06-21 REH6 - Jun 21, 15:40 UTCJun 21, 16:44 UTC1h 5m
2026-06-21 REH6 - Jun 21, 04:30 UTCJun 21, 04:44 UTC15m
2026-06-21 REH6 - Jun 21, 03:34 UTCJun 21, 03:44 UTC10m
2026-06-20 REH6 - Jun 20, 19:04 UTCJun 20, 19:44 UTC40m
2026-06-20 REH6 - Jun 20, 03:39 UTCJun 20, 04:14 UTC35m
2026-06-20 REH6 - Jun 20, 02:29 UTCJun 20, 03:04 UTC35m
2026-06-19 REH6 - Jun 19, 12:59 UTCJun 19, 13:34 UTC35m
2026-06-19 REH6 - Jun 19, 11:45 UTCJun 19, 12:14 UTC30m
2026-06-14 REH6 - Jun 14, 22:55 UTCJun 14, 23:10 UTC14m
2026-06-14 REH6 - Jun 14, 22:10 UTCJun 14, 22:20 UTC10m
2026-06-14 REH6 - Jun 14, 19:55 UTCJun 14, 21:20 UTC1h 25m
2026-06-14 REH6 - Jun 14, 18:30 UTCJun 14, 18:50 UTC20m
2026-06-14 REH6 - Jun 14, 17:35 UTCJun 14, 17:45 UTC10m
2026-06-14 REH6 - Jun 14, 04:10 UTCJun 14, 04:25 UTC15m
2026-06-14 REH6 - Jun 14, 03:20 UTCJun 14, 03:40 UTC20m
2026-06-13 REH6 - Jun 13, 20:00 UTCJun 13, 20:15 UTC15m
2026-06-13 REH6 - Jun 13, 04:35 UTCJun 13, 05:55 UTC1h 20m
2026-06-12 REH6 - Jun 12, 23:50 UTCJun 13, 00:40 UTC50m
2026-06-12 REH6 - Jun 12, 22:20 UTCJun 12, 22:35 UTC15m
2026-06-12 REH6 - Jun 12, 19:35 UTCJun 12, 19:50 UTC15m
2026-06-12 REH6 - Jun 12, 18:20 UTCJun 12, 19:00 UTC40m
2026-06-12 REH6 - Jun 12, 10:10 UTCJun 12, 10:20 UTC10m
2026-06-11 REH6 - Jun 11, 18:30 UTCJun 11, 19:20 UTC50m
2026-06-11 REH6 - Jun 11, 05:15 UTCJun 11, 05:55 UTC40m
2026-06-11 REH6 - Jun 11, 01:25 UTCJun 11, 02:05 UTC40m

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 7h ago.
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.