Host

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The command host allows you to find out an IP address from a host name and the other way round:

# host www.staerk.de
www.staerk.de has address 92.51.132.237
# host 8.8.8.8
8.8.8.8.in-addr.arpa domain name pointer google-public-dns-a.google.com.

If you want to query different mail servers or query for the domain's mail server (the "MX record"), use the command dig.

See also