.1host：DNS信息
参数：
一般情况下，host查找的是A，AAAA，和MX的记录
案例：
-
DNS服务器查询 host -t ns 域名
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A记录和MX记录查询 host 域名（host -t a 域名 + host -t mx 域名）
PS：A (Address) 记录是用来指定主机名（或域名）对应的IP地址记录。用户可以将该域名下的网站服务器指向到自己的web server上。同时也可以设置您域名的子域名。通俗来说A记录就是服务器的IP,域名绑定A记录就是告诉DNS,当你输入域名的时候给你引导向设置在DNS的A记录所对应的服务器。
PS：MX记录也叫做邮件路由记录，用户可以将该域名下的邮件服务器指向到自己的mail server上，然后即可自行操控所有的邮箱设置。您只需在线填写您服务器的IP地址，即可将您域名下的邮件全部转到您自己设定相应的邮件服务器上。简单的说，通过操作MX记录，您才可以得到以您域名结尾的邮局。
4.2Dig ：DNS挖掘
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参数：
root@Kali:/home/dnt# dig -h
Usage: dig [@global-server] [domain] [q-type] [q-class] {q-opt}
{global-d-opt} host [@local-server] {local-d-opt}
[ host [@local-server] {local-d-opt} [...]]
Where: domain is in the Domain Name System
q-class is one of (in,hs,ch,...) [default: in]
q-type is one of (a,any,mx,ns,soa,hinfo,axfr,txt,...) [default:a]
(Use ixfr=version for type ixfr)
q-opt is one of:
-x dot-notation (shortcut for reverse lookups)
-i (use IP6.INT for IPv6 reverse lookups)
-f filename (batch mode)
-b address[#port] (bind to source address/port)
-p port (specify port number)
-q name (specify query name)
-t type (specify query type)
-c class (specify query class)
-k keyfile (specify tsig key file)
-y [hmac:]name:key (specify named base64 tsig key)
-4 (use IPv4 query transport only)
-6 (use IPv6 query transport only)
-m (enable memory usage debugging)
d-opt is of the form +keyword[=value], where keyword is:
+[no]vc (TCP mode)
+[no]tcp (TCP mode, alternate syntax)
+time=### (Set query timeout) [5]
+tries=### (Set number of UDP attempts) [3]
+retry=### (Set number of UDP retries) [2]
+domain=### (Set default domainname)
+bufsize=### (Set EDNS0 Max UDP packet size)
+ndots=### (Set NDOTS value)
+[no]edns[=###] (Set EDNS version) [0]
+[no]search (Set whether to use searchlist)
+[no]showsearch (Search with intermediate results)
+[no]defname (Ditto)
+[no]recurse (Recursive mode)
+[no]ignore (Don't revert to TCP for TC responses.)
+[no]fail (Don't try next server on SERVFAIL)
+[no]besteffort (Try to parse even illegal messages)
+[no]aaonly (Set AA flag in query (+[no]aaflag))
+[no]adflag (Set AD flag in query)
+[no]cdflag (Set CD flag in query)
+[no]cl (Control display of class in records)
+[no]cmd (Control display of command line)
+[no]comments (Control display of comment lines)
+[no]rrcomments (Control display of per-record comments)
+[no]question (Control display of question)
+[no]answer (Control display of answer)
+[no]authority (Control display of authority)
+[no]additional (Control display of additional)
+[no]stats (Control display of statistics)
+[no]short (Disable everything except short
form of answer)
+[no]ttlid (Control display of ttls in records)
+[no]all (Set or clear all display flags)
+[no]qr (Print question before sending)
+[no]nssearch (Search all authoritative nameservers)
+[no]identify (ID responders in short answers)
+[no]trace (Trace delegation down from root [+dnssec])
+[no]dnssec (Request DNSSEC records)
+[no]nsid (Request Name Server ID)
+[no]sigchase (Chase DNSSEC signatures)
+trusted-key=#### (Trusted Key when chasing DNSSEC sigs)
+[no]topdown (Do DNSSEC validation top down mode)
+[no]split=## (Split hex/base64 fields into chunks)
+[no]multiline (Print records in an expanded format)
+[no]onesoa (AXFR prints only one soa record)
+[no]keepopen (Keep the TCP socket open between queries)
global d-opts and servers (before host name) affect all queries.
local d-opts and servers (after host name) affect only that lookup.
-h (print help and exit)
-v (print version and exit)
-
常用： dig 域名 any root@Kali:/home/dnt# dig cnblogs.com any
; <<>> DiG 9.9.5-9+deb8u2-Debian <<>> cnblogs.com any
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18664
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;cnblogs.com. IN ANY
;; ANSWER SECTION:
cnblogs.com. 5 IN NS ns4.dnsv4.com.
cnblogs.com. 5 IN NS ns3.dnsv4.com.
;; Query time: 2010 msec
;; SERVER: 192.168.232.2#53(192.168.232.2)
;; WHEN: Thu Dec 24 23:19:22 CST 2015
;; MSG SIZE rcvd: 71
4.3NS Lookup ：DNS裤子
Windows+Linux都自带
nslookup最简单的用法就是查询域名对应的IP地址，包括A记录和CNAME记录
帮助文档：man nslookup
我们看看windows里面的帮助文档（明了一点）
常用命令：nslookup
0.设置默认服务器
server 8.8.8.8
1.简单查询域名信息
> set type=any
> cnblogs.com
2.查询域名CNAME记录(别名指向)
> set type=cname
> cnblogs.com
3.查询域名A记录（通俗来说A记录就是服务器的IP，域名绑定A记录就是告诉DNS，当你输入域名的时候给你引导向设置在DNS的A记录所对应的服务器）
4.查询域名MX记录(邮件记录)
> set type=mx
> cnblogs.com
5.查询域名ns记录(域名所使用的DNS)
不懂什么意思？给你看个图：（阿里云解析）
在不懂就百度谷歌吧
