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sensors Mode-S transponder

A71429

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N555YE · AIRBUS HELICOPTERS EC-135/635 · operated by REACH AIR MEDICAL SERVICES LLC

Hex
A71429
Octal
51612051
Decimal
10,949,673
Country
US
Tail
N555YE
Type
EC35
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
123
Distinct callsigns
4
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A71429.

Country allocation

The ICAO 24-bit address A71429 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 4 distinct

Callsign Airline Flights Last seen
REH7 - 109 2026-07-26
REH91 - 8 2026-06-28
REH97 - 3 2026-06-30
N555YE - 3 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 REH7 - Jul 26, 20:20 UTCJul 26, 20:35 UTC15m
2026-07-26 REH7 - Jul 26, 19:30 UTCJul 26, 19:40 UTC10m
2026-07-26 REH7 - Jul 26, 17:25 UTCJul 26, 17:40 UTC15m
2026-07-26 REH7 - Jul 26, 16:10 UTCJul 26, 17:00 UTC50m
2026-07-26 REH7 - Jul 26, 15:20 UTCJul 26, 15:35 UTC15m
2026-07-26 REH7 - Jul 26, 14:20 UTCJul 26, 14:35 UTC15m
2026-07-26 REH7 - Jul 26, 13:30 UTCJul 26, 13:40 UTC10m
2026-07-26 REH7 - Jul 26, 03:20 UTCJul 26, 04:05 UTC45m
2026-07-26 REH7 - Jul 26, 00:10 UTCJul 26, 00:55 UTC45m
2026-07-24 REH7 - Jul 24, 13:15 UTCJul 24, 14:00 UTC45m
2026-07-24 REH7 - Jul 24, 09:45 UTCJul 24, 10:55 UTC1h 10m
2026-07-24 REH7 - Jul 24, 07:20 UTCJul 24, 07:35 UTC15m
2026-07-24 REH7 - Jul 24, 06:35 UTCJul 24, 06:50 UTC15m
2026-07-23 REH7 - Jul 23, 11:10 UTCJul 23, 11:20 UTC10m
2026-07-23 REH7 - Jul 23, 03:40 UTCJul 23, 06:35 UTC2h 55m
2026-07-23 REH7 - Jul 23, 01:45 UTCJul 23, 02:40 UTC55m
2026-07-22 REH7 - Jul 22, 23:20 UTCJul 22, 23:35 UTC15m
2026-07-22 REH7 - Jul 22, 22:35 UTCJul 22, 22:50 UTC15m
2026-07-22 REH7 - Jul 22, 21:35 UTCJul 22, 21:50 UTC15m
2026-07-22 REH7 - Jul 22, 03:35 UTCJul 22, 03:50 UTC15m
2026-07-22 REH7 - Jul 22, 02:40 UTCJul 22, 03:00 UTC20m
2026-07-21 REH7 - Jul 21, 22:35 UTCJul 21, 23:10 UTC35m
2026-07-21 REH7 - Jul 21, 20:45 UTCJul 21, 21:05 UTC20m
2026-07-21 REH7 - Jul 21, 13:45 UTCJul 21, 14:05 UTC20m
2026-07-21 REH7 - Jul 21, 12:15 UTCJul 21, 13:20 UTC1h 5m
2026-07-21 REH7 - Jul 21, 10:55 UTCJul 21, 11:45 UTC50m
2026-07-21 REH7 - Jul 21, 04:20 UTCJul 21, 04:35 UTC15m
2026-07-21 REH7 - Jul 21, 03:45 UTCJul 21, 04:00 UTC15m
2026-07-20 REH7 - Jul 20, 19:55 UTCJul 20, 20:10 UTC15m
2026-07-20 REH7 - Jul 20, 19:00 UTCJul 20, 19:30 UTC30m
2026-07-20 REH7 - Jul 20, 17:55 UTCJul 20, 18:10 UTC15m
2026-07-19 REH7 - Jul 19, 16:40 UTCJul 19, 16:55 UTC15m
2026-07-19 REH7 MHR → MHR Jul 19, 15:25 UTCJul 19, 16:15 UTC50m
2026-07-19 REH7 - Jul 19, 14:15 UTCJul 19, 15:05 UTC50m
2026-07-19 REH7 - Jul 19, 13:05 UTCJul 19, 13:35 UTC30m
2026-07-19 REH7 - Jul 19, 07:40 UTCJul 19, 08:00 UTC20m
2026-07-19 REH7 - Jul 19, 06:45 UTCJul 19, 07:15 UTC30m
2026-07-19 REH7 - Jul 19, 05:45 UTCJul 19, 06:00 UTC15m
2026-07-19 REH7 - Jul 19, 02:35 UTCJul 19, 02:50 UTC15m
2026-07-19 REH7 - Jul 19, 01:45 UTCJul 19, 02:00 UTC15m
2026-07-19 REH7 - Jul 19, 00:40 UTCJul 19, 00:55 UTC15m
2026-07-18 REH7 - Jul 18, 23:45 UTCJul 19, 00:00 UTC15m
2026-07-18 REH7 - Jul 18, 19:00 UTCJul 18, 19:15 UTC15m
2026-07-18 REH7 - Jul 18, 18:10 UTCJul 18, 18:30 UTC20m
2026-07-18 REH7 - Jul 18, 15:00 UTCJul 18, 15:15 UTC15m
2026-07-18 REH7 - Jul 18, 13:30 UTCJul 18, 13:55 UTC25m
2026-07-18 REH7 - Jul 18, 05:20 UTCJul 18, 06:50 UTC1h 30m
2026-07-18 REH7 - Jul 18, 04:00 UTCJul 18, 04:35 UTC35m
2026-07-18 REH7 - Jul 18, 02:09 UTCJul 18, 03:25 UTC1h 16m
2026-07-18 REH7 - Jul 18, 00:39 UTCJul 18, 01:05 UTC25m

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 N555YE page for operator, model, and routing details .

Mode-S A71429 frequently asked

What is Mode-S code A71429?
A71429 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N555YE.
Where is Mode-S A71429 registered?
Mode-S code A71429 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 A71429 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A71429, octal 51612051, decimal 10,949,673.
What flights does A71429 operate?
Mode-S A71429 has broadcast 4 distinct callsigns, including REH7, REH91, REH97, N555YE.