host is a simple utility for performing DNS lookups. It is normally used to convert
names to IP addresses and vice versa. When no arguments or options are given, host
prints a short summary of its command line arguments and options.
name is the domain name that is to be looked up. It can also be a dotted-decimal IPv4
address or a colon-delimited IPv6 address, in which case host will by default perform a
reverse lookup for that address. server is an optional argument which is either the name
or IP address of the name server that host should query instead of the server or servers.