Security
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In the same way that search engine spiders crawl the web grabbing site pages, examining and filing them in huge databases ready for retrieval by surfers using Google, Yahoo! or whatever web search engines, email harvester spiders traverse the Web looking for email signatures in web pages — for the (often sole) purpose of building large databases to sell on as spam email address lists. Here are a few methods of email obfuscation.
Email Harvester Robots, Spam and Email Obfuscation
Your Internet connection's IP address is uniquely associated with the following "machine name": The string of text above is known as your Internet connection's "reverse DNS." The end of the string is probably a domain name related to your ISP. This will be common to all customers of this ISP. But the beginning of the string uniquely identifies your Internet connection.
ShieldsUP! — Internet Vulnerability Profiling
Site Monitoring