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# 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