ドメインのIPアドレスを調べる

digコマンドを使えば調べられる

- Lookup the IP(s) associated with a hostname (A records):
    dig +short example.com

- Get a detailed answer for a given domain (A records):
    dig +noall +answer example.com

- Query a specific DNS record type associated with a given domain name:
    dig +short example.com A|MX|TXT|CNAME|NS

- Get all types of records for a given domain name:
    dig example.com ANY

- Specify an alternate DNS server to query:
    dig @8.8.8.8 example.com

- Perform a reverse DNS lookup on an IP address (PTR record):
    dig -x 8.8.8.8

- Find authoritative name servers for the zone and display SOA records:
    dig +nssearch example.com

- Perform iterative queries and display the entire trace path to resolve a domain name:
    dig +trace example.com