WordPress Feeds « WordPress Codex

Finding Your Feed URLThere are times when you want to tell someone your site’s feed address or URL, or you need it to submit it to search engines and directories, many of which now accept feed URL submissions. There are four possible URLs for each of your feeds. Any of these will work.http://example.com/?feed=rsshttp://example.com/?feed=rss2http://example.com/?feed=rdfhttp://example.com/?feed=atomIf you are using custom permalinks, you should be able to reach them through this usage:http://example.com/feed/http://example.com/feed/rss/http://example.com/feed/rss2/http://example.com/feed/rdf/http://example.com/feed/atom/

Source: WordPress Feeds « WordPress Codex