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b4hand/name_to_ip

Last active June 12, 2019 00:43
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Resolve a hostname to all IPs via command line (IPv4 or IPV6)
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name_to_ip
perl -e 'use Socket qw(getaddrinfo getnameinfo NI_NUMERICSERV NI_NUMERICHOST); my ($err, @res) = getaddrinfo($ARGV[0], "www", {socktype => SOCK_STREAM}); for my $r (@res) { my ($err, $ip) = getnameinfo($r->{addr}, NI_NUMERICHOST | NI_NUMERICSERV); print "$ip\n";}'
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b4hand commented Dec 16, 2013

This one-liner expects a single argument to be passed on the command line.

The advantage to this one liner is that it only uses Socket which is a standard library module of Perl, and thus works on every machine that has Perl installed, which is even more common than having the bind libraries. Plus, this uses the actual system call that most programs use for doing name lookups, so it will not bypass /etc/hosts; whereas, the host and dig commands ignore /etc/hosts.

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b4hand commented Dec 16, 2013

You may also be interested in ip_to_name which does a reverse DNS lookup in a one-liner.

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