Apparatus

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sensors Mode-S transponder

AB7A0C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N839CS · AIRBUS HELICOPTERS EC-135/635 · operated by REACH AIR MEDICAL SERVICES LLC

Hex
AB7A0C
Octal
52675014
Decimal
11,237,900
Country
US
Tail
N839CS
Type
EC35
Broadcasting now · callsign CMD7 · 8,200 ft
Flights observed
82
Distinct callsigns
2
Country
US
Last broadcast
1h ago

Current position

AB7A0C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AB7A0C 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 2 distinct

Callsign Airline Flights Last seen
CMD7 - 63 2026-07-01
REH86 - 19 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-01 CMD7 - Jul 1, 02:15 UTCJul 1, 02:45 UTC30m
2026-06-30 CMD7 - Jun 30, 23:45 UTCJul 1, 00:35 UTC50m
2026-06-30 CMD7 - Jun 30, 20:50 UTCJun 30, 21:00 UTC10m
2026-06-27 CMD7 - Jun 27, 00:10 UTCJun 27, 00:50 UTC40m
2026-06-26 CMD7 - Jun 26, 21:30 UTCJun 26, 21:39 UTC10m
2026-06-26 CMD7 - Jun 26, 20:34 UTCJun 26, 20:50 UTC15m
2026-06-26 CMD7 - Jun 26, 17:59 UTCJun 26, 18:49 UTC50m
2026-06-22 CMD7 - Jun 22, 22:10 UTCJun 22, 22:30 UTC20m
2026-06-22 CMD7 - Jun 22, 20:55 UTCJun 22, 21:35 UTC40m
2026-06-22 CMD7 - Jun 22, 19:49 UTCJun 22, 20:10 UTC20m
2026-06-22 CMD7 - Jun 22, 03:24 UTCJun 22, 03:45 UTC20m
2026-06-22 CMD7 - Jun 22, 00:44 UTCJun 22, 01:15 UTC30m
2026-06-21 CMD7 - Jun 21, 22:34 UTCJun 21, 22:49 UTC15m
2026-06-21 CMD7 - Jun 21, 06:24 UTCJun 21, 07:09 UTC45m
2026-06-20 CMD7 SBP → BUR Jun 20, 08:25 UTCJun 20, 10:09 UTC1h 45m
2026-06-20 CMD7 - Jun 20, 06:49 UTCJun 20, 07:00 UTC10m
2026-06-18 CMD7 BFL → SMX Jun 18, 04:10 UTCJun 18, 04:55 UTC45m
2026-06-18 CMD7 - Jun 18, 02:35 UTCJun 18, 03:10 UTC35m
2026-06-18 CMD7 - Jun 18, 01:20 UTCJun 18, 01:30 UTC10m
2026-06-18 CMD7 SMX → SMX Jun 18, 00:20 UTCJun 18, 01:00 UTC40m
2026-06-17 CMD7 - Jun 17, 19:35 UTCJun 17, 20:05 UTC30m
2026-06-16 CMD7 - Jun 16, 07:55 UTCJun 16, 09:25 UTC1h 30m
2026-06-16 CMD7 - Jun 16, 04:30 UTCJun 16, 05:55 UTC1h 25m
2026-06-14 CMD7 - Jun 14, 02:30 UTCJun 14, 02:55 UTC25m
2026-06-11 CMD7 - Jun 11, 20:50 UTCJun 11, 21:10 UTC20m
2026-06-11 CMD7 - Jun 11, 19:40 UTCJun 11, 20:15 UTC35m
2026-06-11 CMD7 - Jun 11, 10:45 UTCJun 11, 11:40 UTC55m
2026-06-11 CMD7 - Jun 11, 07:20 UTCJun 11, 08:15 UTC55m
2026-06-11 CMD7 - Jun 11, 04:15 UTCJun 11, 04:55 UTC40m
2026-06-08 CMD7 - Jun 8, 20:35 UTCJun 8, 22:10 UTC1h 35m
2026-06-07 CMD7 SMX → SMX Jun 7, 20:05 UTCJun 7, 20:20 UTC15m
2026-06-06 CMD7 - Jun 6, 00:25 UTCJun 6, 00:40 UTC15m
2026-06-05 CMD7 - Jun 5, 02:55 UTCJun 5, 03:10 UTC15m
2026-06-04 CMD7 - Jun 4, 22:15 UTCJun 4, 22:55 UTC40m
2026-06-04 CMD7 SMX → SMX Jun 4, 15:40 UTCJun 4, 15:55 UTC15m
2026-06-04 CMD7 SJC → SMX Jun 4, 10:35 UTCJun 4, 11:55 UTC1h 20m
2026-06-04 CMD7 - Jun 4, 07:35 UTCJun 4, 08:40 UTC1h 5m
2026-06-04 CMD7 - Jun 4, 06:30 UTCJun 4, 06:45 UTC15m
2026-06-03 CMD7 - Jun 3, 19:45 UTCJun 3, 19:55 UTC10m
2026-06-03 CMD7 - Jun 3, 18:30 UTCJun 3, 18:45 UTC15m
2026-06-03 CMD7 - Jun 3, 10:45 UTCJun 3, 11:35 UTC50m
2026-06-03 CMD7 SMX → SBA Jun 3, 08:25 UTCJun 3, 08:50 UTC25m
2026-06-02 CMD7 - Jun 2, 22:15 UTCJun 2, 22:35 UTC20m
2026-05-31 CMD7 - May 31, 16:05 UTCMay 31, 16:25 UTC20m
2026-05-31 CMD7 - May 31, 14:15 UTCMay 31, 15:10 UTC55m
2026-05-30 CMD7 - May 30, 17:05 UTCMay 30, 17:45 UTC40m
2026-05-28 CMD7 - May 28, 13:20 UTCMay 28, 14:00 UTC40m
2026-05-28 CMD7 - May 28, 09:40 UTCMay 28, 10:05 UTC25m
2026-05-28 CMD7 - May 28, 07:20 UTCMay 28, 07:35 UTC15m
2026-05-28 CMD7 - May 28, 00:05 UTCMay 28, 00:15 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 N839CS page for operator, model, and routing details .

Mode-S AB7A0C frequently asked

What is Mode-S code AB7A0C?
AB7A0C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N839CS.
Where is Mode-S AB7A0C registered?
Mode-S code AB7A0C 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 AB7A0C broadcasting right now?
Yes. Mode-S AB7A0C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB7A0C, octal 52675014, decimal 11,237,900.
What flights does AB7A0C operate?
Mode-S AB7A0C has broadcast 2 distinct callsigns, including CMD7, REH86.