Certain country-code TLDs such as .CA, .CO.UK, .ORG.UK, .ME.UK, .ASIA, .ES, .COM.ES, NOM.ES, .ORG.ES, .COM.AU, .NET.AU, .ORG.AU, .FR, .SG, .COM.SG, .NU, .XXX require that you provide some additional information while registering domains. This additional information required is called extended attributes.
