dcnl.org.cn域名解析dco.org.cn Q.What kind of characters can be used for Internet Keyword? dco.org.cn 98 Shanghai Ave., Hefei 230001, China dcnl.org.cn A. Internet Keyword can be composed of Chinese characters, alphabets (A-Z, a-z, no matter capitalized or not), numeric (0-or symbols (-,!), and cannot exceed 31 characters (each constituting element is regarded as one character).