there are so many different things that could be going on here. I'd have to look under the hood the really be sure. Either way good job blocking the IP address. It could have been a mass submitter or research tool accessing your site on subnet proxies as well. Either way you did the right thing.
I know this thread is a little old. But, I would not suggest submitting yourself to many of the free directories out there. A lot of them can actually hurt your PR and SERP(search engine results page) rankings because they are not trusted in the eyes of search engines like Google. As for the...
The addurl does not exist anymore. The best way to submit a site is through a sitemap. It's easy if you have wordpress or the like. If you have a custom site you can use Create your Google Sitemap Online - XML Sitemaps Generator . Only resubmit if you make major changes to your site like a...