A site is called banned and not legal in yahoo when it performs something against the rules of yahoo. Yahoo bans these sites as the legal action against the site holder. Yahoo banned site checker tool is the tool which makes you able to determine that whether a site is banned or not. All you have to do to apply this tool is type your domain name and submit it. You can embed this tool on your site which is the good method to check banned site on your site. In order to include yahoo banned site checker tool on your site you have to embed the given html code in your html pages after that your visitor will be able to use yahoo banned site checker tool on your site. This tool is free to use so that you can use it many times and for a long time. We know that yahoo ban’s those sites which do not provide service to its visitors. Now the question is how to protect your site to be banned? Firstly you should consider the rules of yahoo like make a purposeful site which can provide information to its visitors. Don’t use any spam method and avoid black hat SEO to increase search engines ranking. If your site is banned then you can copy your site to a new domain or you can request yahoo to remove ban.