# linux host 123.125.66.120 # 输出: # 120.66.125.123.in-addr.arpa domain name pointer # baiduspider-123-125-66-120.crawl.baidu.com. # windows nslookup 123.125.66.120 # 输出: # Name: baiduspider-123-125-66-120.crawl.baidu.com # Address: 123.125.66.120