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sensors Mode-S transponder

A11E2D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N171PD · AIRBUS HELICOPTERS EC-145 · operated by SUFFOLK COUNTY POLICE DEPT

Hex
A11E2D
Octal
50217055
Decimal
10,559,021
Country
US
Tail
N171PD
Type
EC45
No current signal · last broadcast Jul 22, 12:40 UTC
Flights observed
101
Distinct callsigns
1
Country
US
Last broadcast
Jul 22, 12:40 UTC

Last known position

Most recent position reported by Mode-S A11E2D.

Country allocation

The ICAO 24-bit address A11E2D 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
N171PD - 101 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 N171PD - Jul 22, 12:20 UTCJul 22, 12:40 UTC20m
2026-07-19 N171PD - Jul 19, 20:35 UTCJul 19, 21:45 UTC1h 10m
2026-07-14 N171PD - Jul 14, 18:30 UTCJul 14, 18:40 UTC10m
2026-07-13 N171PD - Jul 13, 23:40 UTCJul 14, 00:25 UTC45m
2026-07-13 N171PD - Jul 13, 16:00 UTCJul 13, 16:35 UTC35m
2026-07-13 N171PD - Jul 13, 14:45 UTCJul 13, 15:25 UTC40m
2026-07-12 N171PD - Jul 12, 14:55 UTCJul 12, 15:55 UTC1h 0m
2026-07-09 N171PD - Jul 9, 23:50 UTCJul 10, 00:40 UTC50m
2026-07-09 N171PD - Jul 9, 16:40 UTCJul 9, 17:40 UTC1h 0m
2026-07-09 N171PD - Jul 9, 16:20 UTCJul 9, 16:25 UTC5m
2026-07-09 N171PD - Jul 9, 02:00 UTCJul 9, 02:25 UTC25m
2026-07-05 N171PD - Jul 5, 18:50 UTCJul 5, 19:20 UTC30m
2026-07-04 N171PD - Jul 4, 17:35 UTCJul 4, 18:35 UTC1h 0m
2026-07-02 N171PD - Jul 2, 17:15 UTCJul 2, 17:45 UTC30m
2026-07-02 N171PD - Jul 2, 03:45 UTCJul 2, 04:30 UTC45m
2026-07-02 N171PD - Jul 2, 02:50 UTCJul 2, 03:00 UTC10m
2026-07-01 N171PD - Jul 1, 13:50 UTCJul 1, 14:50 UTC1h 0m
2026-07-01 N171PD - Jul 1, 00:50 UTCJul 1, 01:30 UTC40m
2026-06-30 N171PD - Jun 30, 19:10 UTCJun 30, 19:40 UTC30m
2026-06-30 N171PD - Jun 30, 00:49 UTCJun 30, 01:50 UTC1h 1m
2026-06-29 N171PD - Jun 29, 20:09 UTCJun 29, 20:54 UTC45m
2026-06-29 N171PD - Jun 29, 18:19 UTCJun 29, 18:49 UTC30m
2026-06-27 N171PD - Jun 27, 21:29 UTCJun 27, 21:55 UTC25m
2026-06-27 N171PD - Jun 27, 04:05 UTCJun 27, 04:29 UTC25m
2026-06-27 N171PD - Jun 27, 00:29 UTCJun 27, 01:35 UTC1h 5m
2026-06-26 N171PD - Jun 26, 03:05 UTCJun 26, 03:29 UTC25m
2026-06-25 N171PD - Jun 25, 19:24 UTCJun 25, 20:25 UTC1h 0m
2026-06-24 N171PD - Jun 24, 11:29 UTCJun 24, 12:04 UTC35m
2026-06-24 N171PD - Jun 24, 10:35 UTCJun 24, 10:45 UTC10m
2026-06-24 N171PD - Jun 24, 00:55 UTCJun 24, 01:44 UTC50m
2026-06-21 N171PD - Jun 21, 23:30 UTCJun 22, 02:19 UTC2h 50m
2026-06-20 N171PD - Jun 20, 22:39 UTCJun 20, 23:04 UTC25m
2026-06-20 N171PD - Jun 20, 20:55 UTCJun 20, 22:05 UTC1h 10m
2026-06-20 N171PD - Jun 20, 20:14 UTCJun 20, 20:25 UTC10m
2026-06-20 N171PD - Jun 20, 13:34 UTCJun 20, 13:49 UTC15m
2026-06-19 N171PD - Jun 19, 22:19 UTCJun 19, 22:55 UTC35m
2026-06-19 N171PD - Jun 19, 16:44 UTCJun 19, 17:39 UTC55m
2026-06-16 N171PD - Jun 16, 23:10 UTCJun 16, 23:20 UTC10m
2026-06-16 N171PD - Jun 16, 22:10 UTCJun 16, 22:20 UTC10m
2026-06-15 N171PD - Jun 15, 16:30 UTCJun 15, 17:20 UTC50m
2026-06-15 N171PD - Jun 15, 10:40 UTCJun 15, 11:00 UTC20m
2026-06-15 N171PD - Jun 15, 10:00 UTCJun 15, 10:09 UTC10m
2026-06-13 N171PD - Jun 13, 16:40 UTCJun 13, 16:50 UTC10m
2026-06-09 N171PD - Jun 9, 16:55 UTCJun 9, 17:10 UTC15m
2026-06-07 N171PD - Jun 7, 22:35 UTCJun 7, 23:45 UTC1h 10m
2026-06-07 N171PD - Jun 7, 20:25 UTCJun 7, 21:20 UTC55m
2026-06-06 N171PD - Jun 6, 00:45 UTCJun 6, 01:15 UTC30m
2026-06-05 N171PD - Jun 5, 09:10 UTCJun 5, 09:55 UTC45m
2026-06-03 N171PD - Jun 3, 23:15 UTCJun 3, 23:30 UTC15m
2026-06-03 N171PD - Jun 3, 18:35 UTCJun 3, 19:10 UTC35m

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 N171PD page for operator, model, and routing details .

Mode-S A11E2D frequently asked

What is Mode-S code A11E2D?
A11E2D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N171PD.
Where is Mode-S A11E2D registered?
Mode-S code A11E2D 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 A11E2D broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 12:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11E2D, octal 50217055, decimal 10,559,021.
What flights does A11E2D operate?
Mode-S A11E2D has broadcast 1 distinct callsign, including N171PD.