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sensors Mode-S transponder

A81D9E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N6219Y · PIPER PA-23 · operated by ROBERTS EDWIN C JR

Hex
A81D9E
Octal
52016636
Decimal
11,017,630
Country
US
Tail
N6219Y
Type
PA23
No current signal · last broadcast Jul 25, 14:10 UTC
Flights observed
93
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 14:10 UTC

Last known position

Most recent position reported by Mode-S A81D9E.

Country allocation

The ICAO 24-bit address A81D9E 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
N6219Y - 93 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N6219Y - Jul 25, 13:35 UTCJul 25, 14:10 UTC35m
2026-07-23 N6219Y - Jul 23, 17:40 UTCJul 23, 18:10 UTC30m
2026-07-23 N6219Y - Jul 23, 15:05 UTCJul 23, 15:15 UTC10m
2026-07-23 N6219Y - Jul 23, 12:40 UTCJul 23, 13:30 UTC50m
2026-07-22 N6219Y - Jul 22, 14:30 UTCJul 22, 14:45 UTC15m
2026-07-20 N6219Y - Jul 20, 15:10 UTCJul 20, 15:30 UTC20m
2026-07-18 N6219Y - Jul 18, 16:30 UTCJul 18, 16:40 UTC10m
2026-07-18 N6219Y - Jul 18, 13:40 UTCJul 18, 14:15 UTC35m
2026-07-17 N6219Y - Jul 17, 17:50 UTCJul 17, 18:19 UTC30m
2026-07-17 N6219Y - Jul 17, 15:55 UTCJul 17, 16:15 UTC20m
2026-07-11 N6219Y - Jul 11, 21:00 UTCJul 11, 21:20 UTC20m
2026-07-11 N6219Y - Jul 11, 15:45 UTCJul 11, 16:30 UTC45m
2026-07-11 N6219Y - Jul 11, 12:10 UTCJul 11, 12:40 UTC30m
2026-07-03 N6219Y - Jul 3, 19:25 UTCJul 3, 20:00 UTC35m
2026-07-03 N6219Y - Jul 3, 17:35 UTCJul 3, 17:45 UTC10m
2026-07-03 N6219Y - Jul 3, 15:15 UTCJul 3, 15:55 UTC40m
2026-07-03 N6219Y - Jul 3, 12:15 UTCJul 3, 12:55 UTC40m
2026-06-29 N6219Y - Jun 29, 16:55 UTCJun 29, 17:24 UTC30m
2026-06-29 N6219Y - Jun 29, 14:04 UTCJun 29, 14:19 UTC15m
2026-06-28 N6219Y - Jun 28, 15:09 UTCJun 28, 15:34 UTC25m
2026-06-28 N6219Y - Jun 28, 12:25 UTCJun 28, 13:04 UTC40m
2026-06-25 N6219Y - Jun 25, 14:50 UTCJun 25, 15:24 UTC35m
2026-06-25 N6219Y - Jun 25, 11:30 UTCJun 25, 11:50 UTC20m
2026-06-24 N6219Y - Jun 24, 15:35 UTCJun 24, 15:49 UTC15m
2026-06-24 N6219Y - Jun 24, 12:40 UTCJun 24, 13:20 UTC40m
2026-06-22 N6219Y - Jun 22, 15:59 UTCJun 22, 16:10 UTC10m
2026-06-21 N6219Y - Jun 21, 19:00 UTCJun 21, 19:29 UTC30m
2026-06-21 N6219Y - Jun 21, 15:09 UTCJun 21, 15:19 UTC10m
2026-06-21 N6219Y - Jun 21, 12:35 UTCJun 21, 13:24 UTC50m
2026-06-20 N6219Y - Jun 20, 19:04 UTCJun 20, 19:49 UTC45m
2026-06-20 N6219Y - Jun 20, 16:05 UTCJun 20, 16:39 UTC35m
2026-06-19 N6219Y - Jun 19, 16:49 UTCJun 19, 17:19 UTC30m
2026-06-19 N6219Y - Jun 19, 14:15 UTCJun 19, 14:24 UTC10m
2026-06-18 N6219Y - Jun 18, 18:10 UTCJun 18, 18:35 UTC25m
2026-06-18 N6219Y - Jun 18, 16:30 UTCJun 18, 16:45 UTC15m
2026-06-18 N6219Y - Jun 18, 15:25 UTCJun 18, 15:35 UTC10m
2026-06-18 N6219Y - Jun 18, 12:35 UTCJun 18, 13:20 UTC45m
2026-06-17 N6219Y - Jun 17, 20:00 UTCJun 17, 20:40 UTC40m
2026-06-17 N6219Y - Jun 17, 18:05 UTCJun 17, 18:30 UTC25m
2026-06-15 N6219Y - Jun 15, 18:40 UTCJun 15, 19:20 UTC40m
2026-06-15 N6219Y - Jun 15, 15:35 UTCJun 15, 15:50 UTC15m
2026-06-15 N6219Y - Jun 15, 14:55 UTCJun 15, 15:04 UTC10m
2026-06-13 N6219Y - Jun 13, 15:30 UTCJun 13, 16:00 UTC30m
2026-06-13 N6219Y - Jun 13, 13:25 UTCJun 13, 13:40 UTC15m
2026-06-13 N6219Y - Jun 13, 12:40 UTCJun 13, 12:50 UTC10m
2026-06-12 N6219Y - Jun 12, 19:20 UTCJun 12, 19:45 UTC25m
2026-06-12 N6219Y - Jun 12, 16:50 UTCJun 12, 17:25 UTC35m
2026-06-10 N6219Y - Jun 10, 18:10 UTCJun 10, 18:40 UTC30m
2026-06-10 N6219Y - Jun 10, 16:40 UTCJun 10, 17:00 UTC20m
2026-06-10 N6219Y - Jun 10, 14:50 UTCJun 10, 15:00 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 N6219Y page for operator, model, and routing details .

Mode-S A81D9E frequently asked

What is Mode-S code A81D9E?
A81D9E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N6219Y.
Where is Mode-S A81D9E registered?
Mode-S code A81D9E 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 A81D9E broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 14:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81D9E, octal 52016636, decimal 11,017,630.
What flights does A81D9E operate?
Mode-S A81D9E has broadcast 1 distinct callsign, including N6219Y.