For free domains with DNS see: http://www.getafreedomain.co.uk/ Their are many extensions to choose from. These are second level domains (SLD), and are as good as real domains (TLD), they come with all the features you'd get with a real domain (TLD). - All domains include DNS Records (Cname etc.) - This is ideal for people who are in need of a short url or can not afford to purchase a real domain. - All extensions are short (such as; you.biz.ly, you.co.cc, you.us.to, you.uk.to...)
All of those are SLD such as CO.cc, where the domain would be yourname.co.cc, where co is the main website and .cc is the actual extension...