host

hostの使い方。

ホスト名とIPアドレスの変換をしてくれます。

オプション

bt # host
Usage: host [-aCdlriTwv] [-c class] [-N ndots] [-t type] [-W time] [-R number] hostname [server]

• a is equivalent to -v -t *
• c specifies query class for non-IN data
• C compares SOA records on authoritative nameservers
• d is equivalent to -v
• l lists all hosts in a domain, using AXFR
• i IP6.INT reverse lookups
• N changes the number of dots allowed before root lookup is done
• r disables recursive processing
• R specifies number of retries for UDP packets
• t specifies the query type
• T enables TCP/IP mode
• v enables verbose output
• w specifies to wait forever for a reply
• W specifies how long to wait for a reply
• 4 use IPv4 query transport only
• 6 use IPv6 query transport only

単純にホスト名かIPアドレスをいれるだけです。
-aつけるとコンパクトに情報がとれます。