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sensors Mode-S transponder

ADC6A4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N987RH · AIRBUS HELICOPTERS EC-145 · operated by AIR METHODS LLC

Hex
ADC6A4
Octal
53343244
Decimal
11,388,580
Country
US
Tail
N987RH
Type
EC45
No current signal · last broadcast Jul 25, 03:00 UTC
Flights observed
92
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 03:00 UTC

Last known position

Most recent position reported by Mode-S ADC6A4.

Country allocation

The ICAO 24-bit address ADC6A4 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
N987RH - 92 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N987RH - Jul 25, 02:50 UTCJul 25, 03:00 UTC10m
2026-07-24 N987RH - Jul 24, 19:10 UTCJul 24, 19:20 UTC10m
2026-07-24 N987RH - Jul 24, 18:05 UTCJul 24, 18:15 UTC10m
2026-07-24 N987RH - Jul 24, 09:05 UTCJul 24, 09:20 UTC15m
2026-07-24 N987RH - Jul 24, 07:35 UTCJul 24, 07:55 UTC20m
2026-07-23 N987RH - Jul 23, 07:25 UTCJul 23, 07:55 UTC30m
2026-07-23 N987RH - Jul 23, 05:00 UTCJul 23, 05:25 UTC25m
2026-07-23 N987RH - Jul 23, 04:00 UTCJul 23, 04:15 UTC15m
2026-07-20 N987RH - Jul 20, 06:10 UTCJul 20, 07:00 UTC50m
2026-07-20 N987RH - Jul 20, 05:05 UTCJul 20, 05:25 UTC20m
2026-07-20 N987RH - Jul 20, 03:50 UTCJul 20, 04:10 UTC20m
2026-07-18 N987RH - Jul 18, 20:10 UTCJul 18, 20:20 UTC10m
2026-07-18 N987RH - Jul 18, 02:25 UTCJul 18, 02:55 UTC31m
2026-07-18 N987RH - Jul 18, 01:34 UTCJul 18, 01:54 UTC20m
2026-07-15 N987RH - Jul 15, 03:20 UTCJul 15, 03:35 UTC15m
2026-07-15 N987RH - Jul 15, 01:45 UTCJul 15, 02:00 UTC15m
2026-07-13 N987RH - Jul 13, 06:35 UTCJul 13, 07:55 UTC1h 20m
2026-07-13 N987RH - Jul 13, 03:40 UTCJul 13, 04:25 UTC45m
2026-07-13 N987RH - Jul 13, 01:40 UTCJul 13, 02:05 UTC25m
2026-07-13 N987RH - Jul 13, 00:45 UTCJul 13, 01:05 UTC20m
2026-07-12 N987RH - Jul 12, 08:15 UTCJul 12, 08:55 UTC40m
2026-07-12 N987RH - Jul 12, 05:45 UTCJul 12, 06:01 UTC15m
2026-07-12 N987RH - Jul 12, 04:45 UTCJul 12, 05:01 UTC15m
2026-07-12 N987RH - Jul 12, 00:20 UTCJul 12, 00:35 UTC15m
2026-07-11 N987RH - Jul 11, 23:30 UTCJul 11, 23:40 UTC10m
2026-07-11 N987RH - Jul 11, 20:10 UTCJul 11, 21:10 UTC1h 0m
2026-07-11 N987RH - Jul 11, 19:25 UTCJul 11, 19:40 UTC15m
2026-07-11 N987RH - Jul 11, 05:10 UTCJul 11, 06:10 UTC1h 0m
2026-07-08 N987RH - Jul 8, 01:20 UTCJul 8, 02:20 UTC1h 0m
2026-07-07 N987RH - Jul 7, 21:40 UTCJul 7, 22:40 UTC1h 0m
2026-07-07 N987RH - Jul 7, 13:25 UTCJul 7, 14:05 UTC40m
2026-07-07 N987RH - Jul 7, 08:50 UTCJul 7, 09:00 UTC10m
2026-07-07 N987RH - Jul 7, 06:55 UTCJul 7, 07:45 UTC50m
2026-07-07 N987RH - Jul 7, 05:20 UTCJul 7, 05:40 UTC20m
2026-07-07 N987RH - Jul 7, 01:15 UTCJul 7, 01:25 UTC10m
2026-07-04 N987RH - Jul 4, 20:25 UTCJul 4, 20:45 UTC20m
2026-07-04 N987RH - Jul 4, 16:40 UTCJul 4, 17:05 UTC25m
2026-07-03 N987RH - Jul 3, 20:10 UTCJul 3, 20:50 UTC40m
2026-07-01 N987RH - Jul 1, 08:35 UTCJul 1, 09:15 UTC40m
2026-06-27 N987RH - Jun 27, 09:34 UTCJun 27, 11:00 UTC1h 25m
2026-06-26 N987RH - Jun 26, 04:55 UTCJun 26, 05:24 UTC30m
2026-06-24 N987RH - Jun 24, 04:15 UTCJun 24, 04:24 UTC10m
2026-06-21 N987RH - Jun 21, 08:10 UTCJun 21, 09:40 UTC1h 30m
2026-06-20 N987RH - Jun 20, 13:55 UTCJun 20, 14:09 UTC15m
2026-06-20 N987RH - Jun 20, 08:29 UTCJun 20, 08:39 UTC10m
2026-06-20 N987RH - Jun 20, 07:34 UTCJun 20, 07:49 UTC15m
2026-06-15 N987RH - Jun 15, 05:45 UTCJun 15, 05:55 UTC10m
2026-06-14 N987RH - Jun 14, 19:55 UTCJun 14, 20:55 UTC1h 0m
2026-06-13 N987RH - Jun 13, 21:10 UTCJun 13, 21:30 UTC20m
2026-06-13 N987RH - Jun 13, 20:15 UTCJun 13, 20:30 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 N987RH page for operator, model, and routing details .

Mode-S ADC6A4 frequently asked

What is Mode-S code ADC6A4?
ADC6A4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N987RH.
Where is Mode-S ADC6A4 registered?
Mode-S code ADC6A4 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 ADC6A4 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 03:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADC6A4, octal 53343244, decimal 11,388,580.
What flights does ADC6A4 operate?
Mode-S ADC6A4 has broadcast 1 distinct callsign, including N987RH.