How to get a NOTAM on a Restricted Area? Is there any online service to get restricted area NOTAMS? 

For example how can I get NOTAMs related to R-2503-D (intermittent by NOTAM 24 Hrs in advance) on Los Angeles Sectional chart?

I found this website but I am not sure how to find by restricted area name.
For SUA NOTAMs, you can find it via sua.faa.gov, in either map or text format.

If an SUA on a chart has defined hours, stick to those.

Example after downloading the text data:



Map example (layer control is useful):



Color indicates if active or scheduled and how far in the future.