Apparatus

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sensors Mode-S transponder

A1DA8A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2187C · CESSNA 195 · operated by ENVISAGE LLC

Hex
A1DA8A
Octal
50355212
Decimal
10,607,242
Country
US
Tail
N2187C
Type
C195
No current signal · last broadcast 5h ago
Flights observed
43
Distinct callsigns
1
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A1DA8A.

Country allocation

The ICAO 24-bit address A1DA8A 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
N2187C - 43 2026-07-14

Recent flights last 43

DateFlightRouteTakeoffLandingDuration
2026-07-14 N2187C - Jul 14, 14:30 UTCJul 14, 14:40 UTC10m
2026-07-14 N2187C - Jul 14, 12:45 UTCJul 14, 12:55 UTC10m
2026-07-13 N2187C - Jul 13, 18:20 UTCJul 13, 18:45 UTC25m
2026-07-11 N2187C - Jul 11, 14:10 UTCJul 11, 14:40 UTC30m
2026-07-10 N2187C - Jul 10, 21:45 UTCJul 10, 22:15 UTC30m
2026-07-10 N2187C - Jul 10, 18:00 UTCJul 10, 19:15 UTC1h 15m
2026-07-09 N2187C - Jul 9, 14:25 UTCJul 9, 16:45 UTC2h 20m
2026-07-09 N2187C - Jul 9, 11:30 UTCJul 9, 12:45 UTC1h 15m
2026-07-07 N2187C - Jul 7, 20:30 UTCJul 7, 21:10 UTC40m
2026-07-07 N2187C - Jul 7, 18:55 UTCJul 7, 19:10 UTC15m
2026-07-07 N2187C - Jul 7, 17:40 UTCJul 7, 18:00 UTC20m
2026-07-07 N2187C - Jul 7, 15:55 UTCJul 7, 16:05 UTC10m
2026-07-07 N2187C - Jul 7, 03:45 UTCJul 7, 04:00 UTC15m
2026-07-06 N2187C - Jul 6, 23:20 UTCJul 6, 23:55 UTC35m
2026-07-06 N2187C - Jul 6, 11:35 UTCJul 6, 11:50 UTC15m
2026-07-05 N2187C - Jul 5, 20:20 UTCJul 5, 21:00 UTC40m
2026-07-05 N2187C - Jul 5, 03:35 UTCJul 5, 04:10 UTC35m
2026-07-04 N2187C - Jul 4, 23:15 UTCJul 4, 23:45 UTC30m
2026-07-04 N2187C - Jul 4, 20:55 UTCJul 4, 21:30 UTC35m
2026-07-04 N2187C - Jul 4, 17:10 UTCJul 4, 17:30 UTC20m
2026-07-04 N2187C - Jul 4, 02:00 UTCJul 4, 02:25 UTC25m
2026-07-04 N2187C - Jul 4, 01:00 UTCJul 4, 01:20 UTC20m
2026-07-03 N2187C - Jul 3, 19:15 UTCJul 3, 19:25 UTC10m
2026-07-03 N2187C - Jul 3, 13:40 UTCJul 3, 14:35 UTC55m
2026-07-03 N2187C - Jul 3, 12:50 UTCJul 3, 13:00 UTC10m
2026-06-28 N2187C - Jun 28, 14:39 UTCJun 28, 14:50 UTC10m
2026-06-28 N2187C - Jun 28, 13:19 UTCJun 28, 13:29 UTC10m
2026-06-28 N2187C - Jun 28, 01:25 UTCJun 28, 01:44 UTC20m
2026-06-27 N2187C - Jun 27, 23:19 UTCJun 27, 23:29 UTC10m
2026-06-27 N2187C - Jun 27, 19:39 UTCJun 27, 21:40 UTC2h 0m
2026-06-27 N2187C - Jun 27, 17:39 UTCJun 27, 18:15 UTC35m
2026-06-27 N2187C - Jun 27, 01:15 UTCJun 27, 01:35 UTC20m
2026-06-27 N2187C - Jun 27, 00:00 UTCJun 27, 00:29 UTC30m
2026-06-26 N2187C - Jun 26, 22:19 UTCJun 26, 22:44 UTC25m
2026-06-26 N2187C - Jun 26, 18:20 UTCJun 26, 19:55 UTC1h 35m
2026-06-26 N2187C - Jun 26, 15:10 UTCJun 26, 15:34 UTC25m
2026-06-26 N2187C - Jun 26, 12:44 UTCJun 26, 12:59 UTC15m
2026-06-25 N2187C - Jun 25, 01:14 UTCJun 25, 01:24 UTC10m
2026-06-24 N2187C - Jun 24, 22:10 UTCJun 24, 22:25 UTC15m
2026-06-22 N2187C - Jun 22, 17:20 UTCJun 22, 17:34 UTC15m
2026-06-22 N2187C - Jun 22, 15:45 UTCJun 22, 15:54 UTC10m
2026-06-21 N2187C - Jun 21, 21:19 UTCJun 21, 21:34 UTC15m
2026-06-21 N2187C - Jun 21, 19:50 UTCJun 21, 20:00 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 N2187C page for operator, model, and routing details .

Mode-S A1DA8A frequently asked

What is Mode-S code A1DA8A?
A1DA8A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2187C.
Where is Mode-S A1DA8A registered?
Mode-S code A1DA8A 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 A1DA8A broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1DA8A, octal 50355212, decimal 10,607,242.
What flights does A1DA8A operate?
Mode-S A1DA8A has broadcast 1 distinct callsign, including N2187C.