Query domain name resolution using dig command under ECS Linux system

Cloud Server ECS Linux system can use the usual dig command to query the domain name resolution. This article gives a brief description of this.

Querying Domain A Records

command Format :

dig <域名>

For example, the query domain name www.aliyun.com parsing situation:

$ dig www.aliyun.com; <<>> DiG 9.8.2rc1-redhat-9.8.2-0.37.rc1.el6_7.7 <<>> www.aliyun.com; Global options: +cmd;; Got answer:;; ->>header<<-opcode:query, Status:noerror, id:15919; FLAGS:QR AA Rd RA; Query:1, Answer:3, Authority:2, Additional:4;                        QUESTION section:;www.aliyun.com. in A;;         ANSWER SECTION:www.aliyun.com.    In the CNAME www-adns.aliyun.com.www-adns.aliyun.com. In CNAME www-adns.aliyun.com.gds.alibabadns.com.www-adns.aliyun.com.gds.alibabadns.com. 247 in A 140.205.62.8;     Authority SECTION:gds.alibabadns.com.     Gdsns2.alibabadns.com.gds.alibabadns.com in NS. Gdsns1.alibabadns.com in NS.;  ADDITIONAL SECTION:gdsns1.alibabadns.com.  877 in A 140.205.122.66gdsns1.alibabadns.com.  877 in A 198.11.138.254gdsns2.alibabadns.com.  877 in A 140.205.67.254gdsns2.alibabadns.com.    877 in  A 140.205.122.88;; Query time:49 msec;; server:10.242.197.247#53 (10.242.197.247); When:thu June 9 18:43:55 2016;; MSG SIZE rcvd:226

Query domain name resolution is in effect at the specified DNS server resolution

command Format :

dig <域名> @<DNS 服务器地址>

For example, query www.aliyun.com if the 223.5.5.5 DNS server resolves to take effect:

$ dig www.aliyun.com @223.5.5.5; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.37.rc1.el6_7.7 <<>> www.aliyun.com @223.5.5.5;; global options: +cmd;; Got answer:;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29651;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0;; QUESTION SECTION:;www.aliyun.com.                        IN      A;; ANSWER SECTION:www.aliyun.com.         95      IN      CNAME   www-adns.aliyun.com.  # 查询到的解析记录www-adns.aliyun.com.    95      IN      CNAME   www-adns.aliyun.com.gds.alibabadns.com.   # 查询到的解析记录www-adns.aliyun.com.gds.alibabadns.com. 95 IN A 140.205.63.8;; Query time: 0 msec;; SERVER: 223.5.5.5#53(223.5.5.5);; WHEN: Thu Jun  9 18:44:42 2016;; MSG SIZE  rcvd: 120

Query a CNAME record for a domain name

command Format :

dig CNAME <域名>

For example, query the CNAME record for the domain name www.aliyun.com :

# dig CNAME www.aliyun.com; <<>> DiG 9.9.4-redhat-9.9.4-14.el7 <<>> CNAME www.aliyun.com;; Global options: +cmd;; Got answer:;; ->>header<<-opcode:query, Status:noerror, id:4690; FLAGS:QR AA Rd RA; Query:1, Answer:1, Authority:3, Additional:7; OPT pseudosection:; edns:version:0, Flags:; udp:4096;; QUESTION Section:;www.aliyun.com.incname;  ANSWER section:www.aliyun.com.120incnamewww-intl-adns.aliyun.com. # Query to the CNAME information;; Authority section: Aliyun.com.172800innsns5.aliyun.com.aliyun.com.172800innsns4.aliyun.com.aliyun.com.172800innsns3.aliyun.com.;; ADDITIONAL section: Ns3.aliyun.com.432000ina42.120.250.251ns4.aliyun.com.432000ina110.75.20.27ns4.aliyun.com.432000ina140.205.71.248ns4.aliyu n.com.432000ina42.156.241.248ns5.aliyun.com.432000ina140.205.2.187ns5.aliyun.com.432000ina198.11.138.248;; Query time:10 msec;; server:10.202.72.118#53 (10.202.72.118); When:fri Jul 11:46:33 CST 2016;; MSG SIZE rcvd:221

Querying IP Reverse-Solution Records

Command format:

dig -x <目标 IP 地址>

$ dig -x 140.205.62.8; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> -x 140.205.62.8;; global options: +cmd;; Got answer:;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 38256;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1;; OPT PSEUDOSECTION:; EDNS: version: 0, flags:; udp: 4096;; QUESTION SECTION:;8.62.205.140.in-addr.arpa.INPTR;; AUTHORITY SECTION:140.in-addr.arpa.945INSOAz.arin.net. dns-ops.arin.net. 2016031910 1800 900 691200 10800;; Query time: 3 msec;; SERVER: 10.202.72.118#53(10.202.72.118);; WHEN: Fri Jul 08 11:51:32 CST 2016;; MSG SIZE  rcvd: 108

Querying MX parsing records for domain names

command Format :

dig mx <目标域名>

For example, query the MX parsing record for domain name aliyun.com:

$ dig MX aliyun.com; <<>> DiG 9.8.2rc1-redhat-9.8.2-0.37.rc1.el6_7.7 <<>> mx aliyun.com;; Global options: +cmd;; Got answer:;; ->>header<<-opcode:query, Status:noerror, id:33606; FLAGS:QR AA Rd RA; Query:1, Answer:1, Authority:3, Additional:7;                    QUESTION section:;aliyun.com. in MX;;             ANSWER SECTION:aliyun.com. 3600 in MX ten mx2.mail.aliyun.com.;             Authority SECTION:aliyun.com.             172800 in NS ns4.aliyun.com.aliyun.com.             172800 in NS ns3.aliyun.com.aliyun.com. 172800 in NS ns5.aliyun.com.;    ADDITIONAL SECTION:mx2.mail.aliyun.com.         In A 110.75.48.150ns3.aliyun.com.         432000 in A 42.120.250.251ns4.aliyun.com.         432000 in A 110.75.20.27ns4.aliyun.com.         432000 in A 140.205.71.248ns4.aliyun.com.       432000 in A 42.156.241.248ns5.aliyun.com.  432000 in A 198.11.138.248ns5.aliyun.com. 432000 in A 140.205.2.187; Query time:1 msec;; server:10.242.197.247#53 (10.242.197.247); When:thu June 9 18:59:44 2016;; MSG SIZE rcvd:219

Cloud Server ECS Linux system query domain name resolution using the DIG command