1、邮件信息收集
theharverster -d [目标网络域名地址] -l [邮件地址数量] -b [使用的搜索的公共知识库] eg : theharvester -d yalong.cn -l 20 -b baidu
2、 use Whois search DNS and ip register name and phone number and email
step one we can use the Whois.net the url: http:www.whois.net or another website is NetCraft the url :https://www.netcraft.com/
step two: use the command whois ,the screenshout as follow
another wegit tools is host it can translate ip to hostname
nslookup id find DNS