dnsenum的目的是尽可能收集一个域的信息，它能够通过谷歌或者字典件猜测可能存在的域名，以及对一个网段进行反向查询。它可以查询网站的主机地址信息、域名服务器、mx record（函件交换记录），在域名服务器上执行axfr请求，通过google脚本得到扩展域名信息（google hacking），提取自域名并查询，计算C类地址并执行whois询，执行反向查询，把地址段写入文件。
从其中还是可以得到不少好玩的信息，例如：wooyun 是建立在sinaapp上的
root@kali:~/Desktop/crypt# dnsenum --enum www.wooyun.org
dnsenum.pl VERSION:1.2.
Warning: can't load Net::Whois::IP module, whois queries disabled.
----- www.wooyun.org -----
Host's addresses:
__________________ wooyun.sinaapp.com IN A 220.181.136.35
wooyun.sinaapp.com IN A 220.181.136.36 Name Servers:
______________ Error: can't continue no NS record for www.wooyun.org
信息收集方面非常有用
root@kali:~/Desktop# dnsenum --enum 51cto.com
dnsenum.pl VERSION:1.2.2
Warning: can't load Net::Whois::IP module, whois queries disabled. ----- 51cto.com ----- Host's addresses:
__________________ 51cto.com 600 IN A 118.144.78.52
51cto.com 600 IN A 118.144.78.54 Name Servers:
______________ ns1.dnsv2.com 87409 IN A 122.225.217.193
ns1.dnsv2.com 87409 IN A 183.60.59.230
ns1.dnsv2.com 87409 IN A 221.204.186.8
ns2.dnsv2.com 87409 IN A 119.167.195.7
ns2.dnsv2.com 87409 IN A 180.153.162.151
ns2.dnsv2.com 87409 IN A 112.90.143.34 Mail (MX) Servers:
___________________
root@kali:~/Desktop# dnsenum --enum cnblogs.com
dnsenum.pl VERSION:1.2.
Warning: can't load Net::Whois::IP module, whois queries disabled. ----- cnblogs.com ----- Host's addresses:
__________________ cnblogs.com IN A 42.121.252.58 Name Servers:
______________ ns4.dnsv3.com IN A 115.236.151.139
ns4.dnsv3.com IN A 180.153.162.152
ns4.dnsv3.com IN A 221.204.186.9
ns3.dnsv3.com IN A 183.60.59.231
ns3.dnsv3.com IN A 112.90.143.35
ns3.dnsv3.com IN A 119.167.195.10 Mail (MX) Servers:
___________________ alt2.aspmx.l.google.com IN A 74.125.137.26
aspmx5.googlemail.com IN A 173.194.75.26
aspmx2.googlemail.com IN A 74.125.142.26
aspmx.l.google.com IN A 74.125.129.26
alt1.aspmx.l.google.com IN A 74.125.142.26
aspmx3.googlemail.com IN A 74.125.137.26
aspmx4.googlemail.com IN A 173.194.68.26 Trying Zone Transfers and getting Bind Versions:
_________________________________________________ Trying Zone Transfer for cnblogs.com on ns4.dnsv3.com ...
AXFR record query failed: query timed out
Unable to obtain Server Version for ns4.dnsv3.com : query timed out
Trying Zone Transfer for cnblogs.com on ns3.dnsv3.com ...
AXFR record query failed: query timed out
Unable to obtain Server Version for ns3.dnsv3.com : query timed out
Wildcards detected, all subdomains will point to the same IP address, bye.
fierce -dns 查询
root@kali:~/Desktop# fierce -dns 51cto.com
DNS Servers for 51cto.com:
ns1.dnsv2.com
ns2.dnsv2.com Trying zone transfer first...
Testing ns1.dnsv2.com
Request timed out or transfer not allowed.
Testing ns2.dnsv2.com
Request timed out or transfer not allowed.