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nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
HiChina DNS services
The DOCTYPE is a required preamble for HTML5 websites.
These websites are related to xfocus.net in terms of content, traffic and structure
hackbase.com
hacker.com.cn
77169.com
nsfocus.net
20cn.net
blackhat.com
3800hk.com
infosec.org.cn