1、先用nslookup获得域名对应的主机ip：nslookup 域名
2、再根据主机ip获得对应的主机名称： host ip
$ nslookup baidu.com Server: 127.0.1.1 Address: 127.0.1.1#53 Non-authoritative answer: Name: baidu.com Address: 39.156.69.79 Name: baidu.com Address: 220.181.38.148
############################
$ host 39.156.69.79 Host 79.69.156.39.in-addr.arpa. not found: 3(NXDOMAIN)
原文：https://www.cnblogs.com/igoodful/p/11661801.html