host_info(n)
Access the Internet host database to get information about the machine whose name is denoted by the string n.
The host-information record that is returned will contain the official name of the machine, a list of aliases
(alternative names), and a non-empty list of IP addresses for this machine. On success, return a host-information
record. An exception is raised when n does not appear in the database.
let hi = host_info("google.com")
host_info_name(hi)
// google.com
host_info_aliases(hi)
// []
host_info_addresses(hi)
// [#u8[172, 217, 26, 206]]