Apparatus

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sensors Mode-S transponder

A7174D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N556SH · ROBINSON R-22 Mariner · operated by NOVEMBER ALPHA LLC

Hex
A7174D
Octal
51613515
Decimal
10,950,477
Country
US
Tail
N556SH
Type
R22
No current signal · last broadcast 2d ago
Flights observed
44
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A7174D.

Country allocation

The ICAO 24-bit address A7174D 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
N556SH - 44 2026-07-11

Recent flights last 44

DateFlightRouteTakeoffLandingDuration
2026-07-11 N556SH CNO → CNO Jul 11, 22:45 UTCJul 11, 23:40 UTC55m
2026-07-11 N556SH CNO → CNO Jul 11, 17:05 UTCJul 11, 17:55 UTC50m
2026-07-09 N556SH - Jul 9, 17:10 UTCJul 9, 18:25 UTC1h 15m
2026-06-30 N556SH - Jun 30, 03:55 UTCJun 30, 06:15 UTC2h 20m
2026-06-28 N556SH CNO → CNO Jun 28, 18:00 UTCJun 28, 19:55 UTC1h 55m
2026-06-26 N556SH - Jun 26, 20:10 UTCJun 26, 20:55 UTC45m
2026-06-26 N556SH CNO → CNO Jun 26, 17:29 UTCJun 26, 18:54 UTC1h 25m
2026-06-24 N556SH - Jun 24, 19:59 UTCJun 24, 21:50 UTC1h 50m
2026-06-23 N556SH CNO → CNO Jun 23, 18:55 UTCJun 23, 20:40 UTC1h 45m
2026-06-23 N556SH CNO → CNO Jun 23, 17:09 UTCJun 23, 17:39 UTC30m
2026-06-22 N556SH CNO → CNO Jun 22, 17:29 UTCJun 22, 21:10 UTC3h 40m
2026-06-21 N556SH - Jun 21, 19:05 UTCJun 21, 19:34 UTC30m
2026-06-21 N556SH CNO → RBK Jun 21, 17:45 UTCJun 21, 18:29 UTC45m
2026-06-20 N556SH CNO → CNO Jun 20, 16:55 UTCJun 20, 18:40 UTC1h 45m
2026-06-19 N556SH CNO → CNO Jun 19, 17:49 UTCJun 19, 19:14 UTC1h 25m
2026-06-13 N556SH CNO → CNO Jun 13, 19:35 UTCJun 13, 21:35 UTC2h 0m
2026-06-13 N556SH CNO → CNO Jun 13, 16:50 UTCJun 13, 18:00 UTC1h 10m
2026-06-13 N556SH CNO → CNO Jun 13, 14:50 UTCJun 13, 15:45 UTC55m
2026-06-10 N556SH - Jun 10, 19:35 UTCJun 10, 21:35 UTC2h 0m
2026-06-10 N556SH - Jun 10, 17:00 UTCJun 10, 18:40 UTC1h 40m
2026-06-07 N556SH CNO → CNO Jun 7, 16:35 UTCJun 7, 18:20 UTC1h 45m
2026-05-29 N556SH - May 29, 20:25 UTCMay 29, 21:45 UTC1h 20m
2026-05-24 N556SH CNO → CNO May 24, 19:45 UTCMay 24, 20:40 UTC55m
2026-05-24 N556SH CNO → CNO May 24, 16:30 UTCMay 24, 18:10 UTC1h 40m
2026-05-23 N556SH CNO → CNO May 23, 19:55 UTCMay 23, 20:45 UTC50m
2026-05-15 N556SH - May 15, 01:40 UTCMay 15, 02:00 UTC20m
2026-05-14 N556SH CNO → CNO May 14, 22:45 UTCMay 15, 00:30 UTC1h 45m
2026-05-14 N556SH - May 14, 20:20 UTCMay 14, 21:50 UTC1h 30m
2026-05-07 N556SH - May 7, 16:55 UTCMay 7, 18:55 UTC2h 0m
2026-05-04 N556SH CNO → CNO May 4, 16:30 UTCMay 4, 18:30 UTC2h 0m
2026-05-02 N556SH CNO → CNO May 2, 22:45 UTCMay 2, 23:45 UTC1h 0m
2026-05-01 N556SH CNO → CNO May 1, 16:40 UTCMay 1, 18:10 UTC1h 30m
2026-04-29 N556SH CNO → CNO Apr 29, 17:40 UTCApr 29, 19:00 UTC1h 20m
2026-04-24 N556SH - Apr 24, 16:40 UTCApr 24, 18:40 UTC2h 0m
2026-04-22 N556SH CNO → CNO Apr 22, 16:50 UTCApr 22, 18:45 UTC1h 55m
2026-04-19 N556SH - Apr 19, 22:25 UTCApr 20, 00:25 UTC2h 0m
2026-04-19 N556SH CNO → CNO Apr 19, 19:45 UTCApr 19, 20:35 UTC50m
2026-04-19 N556SH CNO → CNO Apr 19, 16:35 UTCApr 19, 18:10 UTC1h 35m
2026-04-17 N556SH CNO → CNO Apr 17, 21:25 UTCApr 17, 22:25 UTC1h 0m
2026-04-17 N556SH CNO → CNO Apr 17, 20:35 UTCApr 17, 21:20 UTC45m
2026-04-16 N556SH CNO → CNO Apr 16, 21:14 UTCApr 16, 21:50 UTC35m
2026-04-16 N556SH CNO → CNO Apr 16, 20:55 UTCApr 16, 21:10 UTC15m
2026-04-16 N556SH - Apr 16, 19:15 UTCApr 16, 19:25 UTC10m
2026-04-16 N556SH - Apr 16, 18:00 UTCApr 16, 19:00 UTC1h 0m

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 N556SH page for operator, model, and routing details .

Mode-S A7174D frequently asked

What is Mode-S code A7174D?
A7174D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N556SH.
Where is Mode-S A7174D registered?
Mode-S code A7174D 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 A7174D broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7174D, octal 51613515, decimal 10,950,477.
What flights does A7174D operate?
Mode-S A7174D has broadcast 1 distinct callsign, including N556SH.