sensors Mode-S transponder

A2D691

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N282MW · CESSNA 208 Caravan · operated by METROPOLITAN WATER DISTRICT OF SOUTHERN CALIFORNIA

Hex
A2D691
Octal
50553221
Decimal
10,671,761
Country
US
Tail
N282MW
Type
C208
No current signal · last broadcast 23h ago
Flights observed
7
Distinct callsigns
1
Country
US
Last broadcast
23h ago

Last known position

Most recent position reported by Mode-S A2D691.

Country allocation

The ICAO 24-bit address A2D691 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
N282MW - 7 2026-04-13

Recent flights last 7

DateFlightRouteTakeoffLandingDuration
2026-04-13 N282MW - Apr 13, 23:20 UTCApr 13, 23:40 UTC20m
2026-04-13 N282MW - Apr 13, 22:35 UTCApr 13, 22:50 UTC15m
2026-04-13 N282MW - Apr 13, 20:45 UTCApr 13, 20:55 UTC10m
2026-04-13 N282MW - Apr 13, 17:05 UTCApr 13, 17:10 UTC5m
2026-04-13 N282MW - Apr 13, 14:05 UTCApr 13, 15:10 UTC1h 5m
2026-04-13 N282MW - Apr 13, 12:20 UTCApr 13, 13:20 UTC1h 0m
2026-04-13 N282MW - Apr 13, 12:10 UTCApr 13, 12:15 UTC5m

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 N282MW page for operator, model, and routing details .

Mode-S A2D691 frequently asked

What is Mode-S code A2D691?
A2D691 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N282MW.
Where is Mode-S A2D691 registered?
Mode-S code A2D691 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 A2D691 broadcasting right now?
No active broadcast right now. Last signal was 23h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2D691, octal 50553221, decimal 10,671,761.
What flights does A2D691 operate?
Mode-S A2D691 has broadcast 1 distinct callsign, including N282MW.