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December 20, 2015 18:49
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Do an IP to name resolution from the command line
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| perl -e 'use Socket qw(getnameinfo inet_aton pack_sockaddr_in NI_NUMERICSERV); my $ip = inet_aton($ARGV[0]); my $addr = pack_sockaddr_in(80, $ip); my ($err, $hostname) = getnameinfo($addr, NI_NUMERICSERV); print "$hostname\n"' |
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This one-liner expects a single IP address 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.
You may also be interested in name_to_ip which does a forward DNS lookup in a one-liner.