Apparatus

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sensors Mode-S transponder

A11D1A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N171CD · CIRRUS SR-20 · operated by LIVERNOIS GREGORY DBA, IFLYHI AVIATION

Hex
A11D1A
Octal
50216432
Decimal
10,558,746
Country
US
Tail
N171CD
Type
SR20
No current signal · last broadcast Jul 20, 22:05 UTC
Flights observed
59
Distinct callsigns
2
Country
US
Last broadcast
Jul 20, 22:05 UTC

Last known position

Most recent position reported by Mode-S A11D1A.

Country allocation

The ICAO 24-bit address A11D1A 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
N171CD - 51 2026-07-20
NGF7962 - 8 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 NGF7962 - Jul 20, 19:55 UTCJul 20, 22:05 UTC2h 10m
2026-07-20 N171CD - Jul 20, 15:35 UTCJul 20, 17:40 UTC2h 5m
2026-07-19 N171CD - Jul 19, 23:15 UTCJul 19, 23:55 UTC40m
2026-07-19 N171CD - Jul 19, 21:55 UTCJul 19, 22:20 UTC25m
2026-07-17 N171CD - Jul 17, 22:20 UTCJul 18, 00:00 UTC1h 40m
2026-07-17 NGF7962 - Jul 17, 20:20 UTCJul 17, 20:55 UTC35m
2026-07-17 NGF7962 - Jul 17, 18:55 UTCJul 17, 19:49 UTC55m
2026-07-17 N171CD - Jul 17, 17:44 UTCJul 17, 18:19 UTC35m
2026-07-16 N171CD PAE → PAE Jul 16, 03:15 UTCJul 16, 04:05 UTC50m
2026-07-12 N171CD PAE → PAE Jul 12, 17:25 UTCJul 12, 17:50 UTC25m
2026-07-12 N171CD - Jul 12, 16:15 UTCJul 12, 16:45 UTC30m
2026-07-11 N171CD - Jul 11, 01:45 UTCJul 11, 02:10 UTC25m
2026-07-11 N171CD - Jul 11, 00:30 UTCJul 11, 01:00 UTC30m
2026-07-10 NGF7962 - Jul 10, 23:15 UTCJul 10, 23:45 UTC30m
2026-07-10 NGF7962 - Jul 10, 22:05 UTCJul 10, 22:45 UTC40m
2026-07-09 N171CD - Jul 9, 19:50 UTCJul 9, 20:15 UTC25m
2026-07-09 NGF7962 - Jul 9, 18:55 UTCJul 9, 19:05 UTC10m
2026-07-09 N171CD - Jul 9, 18:00 UTCJul 9, 18:15 UTC15m
2026-07-07 N171CD - Jul 7, 22:50 UTCJul 7, 23:30 UTC40m
2026-07-07 N171CD - Jul 7, 21:50 UTCJul 7, 22:10 UTC20m
2026-07-04 N171CD - Jul 4, 22:00 UTCJul 5, 00:25 UTC2h 25m
2026-07-04 N171CD - Jul 4, 17:15 UTCJul 4, 19:10 UTC1h 55m
2026-07-03 N171CD - Jul 3, 18:05 UTCJul 3, 19:45 UTC1h 40m
2026-07-03 N171CD - Jul 3, 01:40 UTCJul 3, 02:15 UTC35m
2026-07-03 N171CD - Jul 3, 00:25 UTCJul 3, 01:00 UTC35m
2026-07-02 N171CD - Jul 2, 22:25 UTCJul 2, 23:20 UTC55m
2026-06-28 N171CD - Jun 28, 20:34 UTCJun 28, 21:24 UTC50m
2026-06-27 N171CD - Jun 27, 21:50 UTCJun 27, 22:40 UTC50m
2026-06-26 N171CD - Jun 26, 20:24 UTCJun 26, 20:59 UTC35m
2026-06-26 N171CD - Jun 26, 17:19 UTCJun 26, 17:54 UTC35m
2026-06-22 N171CD - Jun 22, 02:19 UTCJun 22, 04:00 UTC1h 40m
2026-06-21 N171CD - Jun 21, 21:14 UTCJun 21, 23:50 UTC2h 35m
2026-06-21 N171CD - Jun 21, 16:30 UTCJun 21, 18:50 UTC2h 20m
2026-06-20 N171CD - Jun 20, 15:19 UTCJun 20, 15:44 UTC25m
2026-06-17 N171CD - Jun 17, 04:15 UTCJun 17, 04:45 UTC30m
2026-06-17 N171CD - Jun 17, 02:00 UTCJun 17, 02:25 UTC25m
2026-06-17 N171CD BLI → PAE Jun 17, 00:10 UTCJun 17, 00:40 UTC30m
2026-06-16 N171CD - Jun 16, 22:30 UTCJun 16, 23:30 UTC1h 0m
2026-06-16 N171CD RSJ → PAE Jun 16, 01:50 UTCJun 16, 02:20 UTC30m
2026-06-15 N171CD PAE → ESD Jun 15, 20:30 UTCJun 15, 22:20 UTC1h 50m
2026-06-14 N171CD - Jun 14, 18:55 UTCJun 14, 19:15 UTC20m
2026-06-12 N171CD - Jun 12, 04:35 UTCJun 12, 04:50 UTC15m
2026-06-12 NGF7962 - Jun 12, 03:40 UTCJun 12, 04:00 UTC20m
2026-06-11 NGF7962 - Jun 11, 23:55 UTCJun 12, 00:25 UTC30m
2026-06-11 N171CD PAE → BFI Jun 11, 22:40 UTCJun 11, 23:00 UTC20m
2026-06-11 N171CD - Jun 11, 03:20 UTCJun 11, 03:40 UTC20m
2026-06-11 N171CD - Jun 11, 01:20 UTCJun 11, 01:45 UTC25m
2026-06-09 N171CD - Jun 9, 18:05 UTCJun 9, 18:45 UTC40m
2026-06-05 N171CD - Jun 5, 05:00 UTCJun 5, 06:55 UTC1h 55m
2026-06-05 N171CD - Jun 5, 03:35 UTCJun 5, 03:45 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 N171CD page for operator, model, and routing details .

Mode-S A11D1A frequently asked

What is Mode-S code A11D1A?
A11D1A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N171CD.
Where is Mode-S A11D1A registered?
Mode-S code A11D1A 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 A11D1A broadcasting right now?
No active broadcast right now. Last signal was Jul 20, 22:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11D1A, octal 50216432, decimal 10,558,746.
What flights does A11D1A operate?
Mode-S A11D1A has broadcast 2 distinct callsigns, including N171CD, NGF7962.