常用顶级域名 com Commercial organizations edu Educational institutions GoV Government institutions Int International organizations Mil U.S.military institutions Net Networking organizations org Non-profit organizations Country code A country 量I S I R。。aaa TLD List:https://data.iana.org/TLD/tlds-alpha-by-domain.txt 命名机制遵循的是组织边界，而不是物理网络的边界 例如：WWw.ustc.edu.cn常用顶级域名 com Commercial organizations edu Educational institutions Gov Government institutions Int International organizations Mil U.S. military institutions Net Networking organizations org Non-profit organizations Country code A country ……. ………… 命名机制遵循的是组织边界，而不是物理网络的边界 例如：www.ustc.edu.cn 最新TLD List：https://data.iana.org/TLD/tlds-alpha-by-domain.txt