dig命令是查询DNS最好的朋友,这个和windows上的Nslookup命令比强大很多。默认linux的一般都已有安装,如果是精简的版本,安装一下即可。
centos安装命令:yum install bind-utils
debian安装:apt-get install dnsutils
查本机版本:
dig -v
查一个域名:
dig www.gmail.com
dig www.gmail.com ; <<>> DiG 9.9.5-9+deb8u14-Debian <<>> www.gmail.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57472 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;www.gmail.com.INA ;; ANSWER SECTION: www.gmail.com.21599INCNAMEmail.google.com. mail.google.com.21599INCNAMEgooglemail.l.google.com. googlemail.l.google.com. 299INA216.58.221.229 ;; Query time: 18 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Sun Jan 21 10:30:38 EST 2018 ;; MSG SIZE rcvd: 111
查解析值类型
dig a/mx/cname/txt/ns gmail.com
dig mx gmail.com ; <<>> DiG 9.9.5-9+deb8u14-Debian <<>> mx gmail.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52030 ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;gmail.com.INMX ;; ANSWER SECTION: gmail.com.3599INMX40 alt4.gmail-smtp-in.l.google.com. gmail.com.3599INMX20 alt2.gmail-smtp-in.l.google.com. gmail.com.3599INMX10 alt1.gmail-smtp-in.l.google.com. gmail.com.3599INMX30 alt3.gmail-smtp-in.l.google.com. gmail.com.3599INMX5 gmail-smtp-in.l.google.com. ;; Query time: 18 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Sun Jan 21 10:32:44 EST 2018 ;; MSG SIZE rcvd: 161
查IP反解
dig -x IP
dig -x 8.8.8.8 ; <<>> DiG 9.9.5-9+deb8u14-Debian <<>> -x 8.8.8.8 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47223 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;8.8.8.8.in-addr.arpa.INPTR ;; ANSWER SECTION: 8.8.8.8.in-addr.arpa.21599INPTRgoogle-public-dns-a.google.com. ;; Query time: 20 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Sun Jan 21 10:33:55 EST 2018 ;; MSG SIZE rcvd: 93
只想看精简信息末尾加
+short
例如:dig mx qq.com +short
指定DNS服务器查询命令
@NS地址,例如:dig a qq.com @8.8.8.8
DNS的解析是递规解析,可加+tracer进行完整无缓冲查询
例如:dig a qq.com +trace
最后下一篇我们将介绍模拟IP查询DNS解析记录值
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