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dig

Dig is a network tool that can be used to query DNS records on a DNS server, including host addresses, mail exchange records, and domain name server records.

Domain name

Set the DNS type to query (-t)

Use IPv4 query (-4)

Use IPv6 query (-6)

Use UDP instead of TCP (-b)

Set the DNS type to query (-c)

Specify the list file name of the DNS server to be queried (-f)

Use DNSSEC when verifying responses (-k)

Enable memory usage (-m)

Specify the port number of the DNS server to be queried (-p)

Ignore the /etc/resolv.conf file (-u)

Specify the IP address to perform reverse DNS query (-x)

Specify the TSIG key to use (-y)

Display all records used in retrieval (-z)

Example

Query the IP address of a domain:
```
dig example.com
```
Query the MX record of a specific host:
```
dig example.com MX
```
Query the TXT record of a specific host:
```
dig example.com TXT
```
Query the IPv6 address of a specific host:
```
dig example.com AAAA
```
Query the NS record of a specific host:
```
dig example.com NS
```
Query the SOA record of a specific host:
```
dig example.com SOA
```