dig

dig是一个网络管理命令行工具，用于查询域名系统（DNS）。dig是域名服务器软件套件BIND的组成部分。

用法示例

在这个例子中，dig用于查询域名example.com中的任何类型的记录信息。

$ dig example.com any
; <<>> DiG 9.6.1 <<>> example.com any
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4016
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;example.com.                   IN      ANY

;; ANSWER SECTION:
example.com.            172719  IN      NS      a.iana-servers.net.
example.com.            172719  IN      NS      b.iana-servers.net.
example.com.            172719  IN      A       208.77.188.166
example.com.            172719  IN      SOA     dns1.icann.org. hostmaster.icann.org. 2007051703 7200 3600 1209600 86400

;; Query time: 1 msec
;; SERVER: ::1#53(::1)
;; WHEN: Wed Aug 12 11:40:43 2009
;; MSG SIZE  rcvd: 154

上例中的数字172719是存活時間值，表示数据的有效时间。

人們可以查詢指定的DNS服务器以获取特定记录；例如此例中的MX记录：

$ dig wikimedia.org MX @ns0.wikimedia.org
; <<>> DiG 9.6.1 <<>> wikimedia.org MX @ns0.wikimedia.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61144
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 2
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;wikimedia.org.                 IN      MX

;; ANSWER SECTION:
wikimedia.org.          3600    IN      MX      10 mchenry.wikimedia.org.
wikimedia.org.          3600    IN      MX      50 lists.wikimedia.org.

;; ADDITIONAL SECTION:
mchenry.wikimedia.org.  3600    IN      A       208.80.152.186
lists.wikimedia.org.    3600    IN      A       91.198.174.5

;; Query time: 73 msec
;; SERVER: 208.80.152.130#53(208.80.152.130)
;; WHEN: Wed Aug 12 11:51:03 2009
;; MSG SIZE  rcvd: 109

参考

参考书目
  • Paul Albitz and Cricket Liu. DNS and BIND, 5th Edition. Nutshell Series. O'Reilly and Associates, Inc., 2006.

外部链接
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