You can have zero character domain names. Briefly trying out a few of the country TLDs, the one for Anguilla works: http://ai http://ai. the trialing dot is not

You can have zero character domain names. Briefly trying out a few of the country TLDs, the one for Anguilla works: http://ai http://ai. the trialing dot is not needed but helps tell your browser not to try to expand it further. Many TLDs do not resolve, though many others resolve to the TLD's registrar's site.