顶级域名 Domain Name Assigned To com Commercial organization edu Educational institution g Govemment( Military group net Major network support center org Organization other than those above arpa Temporary ARPA domain(still used) International organization country code A country ●不同的域名指代不同的系统或机构 7 2021/1/297 2021/1/29 顶级域名 ⚫ 不同的域名指代不同的系统或机构