The best way to avoid being blacklisted by the search engines is to avoid using some questionable techniques that were once popular to gain high rankings. Even if your website is not blacklisted by using some of the techniques below, it may be penalized (buried in the rankings) so your traffic will suffer all the same. When a search engine blacklists a website it will throw your listing off their site and block your site from coming aboard again. This can be done by blocking the domain name, the IP address or both.