DNS Tools¶
nslookup
The "name server lookup" tool is used to query name servers to find information about resource records. Let's find where the name server for google.com is:
mo:~$ nslookup www.google.com Server: 127.0.1.1 Address: 127.0.1.1#53 Non-authoritative answer: Name: www.google.com Address: 216.58.192.4
dig
Dig (domain information groper) is a powerful tool for getting information about DNS name servers, it is more flexible than nslookup and great for troubleshooting DNS issues.
mo:~$ dig www.google.com ; <<>> DiG 9.9.5-3-Ubuntu <<>> www.google.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42376 ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; MBZ: 0005 , udp: 512 ;; QUESTION SECTION: ;www.google.com. IN A ;; ANSWER SECTION: www.google.com. 5 IN A 74.125.239.147 www.google.com. 5 IN A 74.125.239.144 www.google.com. 5 IN A 74.125.239.146 www.google.com. 5 IN A 74.125.239.145 www.google.com. 5 IN A 74.125.239.148 ;; Query time: 27 msec ;; SERVER: 127.0.1.1#53(127.0.1.1) ;; WHEN: Mon Dec 04 10:14:00 GMT 2023 ;; MSG SIZE rcvd: 123
Exercise¶
Read up on the manpage for dig.
Quiz Questions¶
Click the right arrow to view the answers