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Edit File: quickwhoisips

#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/quickwhoisips                   Copyright 2022 cPanel, L.L.C.
#                                                           All rights reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited

use strict;
use Cpanel::Ips::Fetch ();
use Socket;
use Cpanel::Logger ();

Cpanel::Logger->new()->deprecated("'$0' is deprecated, and will be removed in a later version of cPanel.");

my %IPS;
if ( !@ARGV ) {
    %IPS = Cpanel::Ips::Fetch::fetchipslist();
}
else {
    %IPS = map { $_ => 1 } @ARGV;
}

my $proto = getprotobyname('tcp');
my $iaddr = gethostbyname('rs.internic.net');
my $port  = getservbyname( 'whois', 'tcp' );
if ( !$port ) { $port = 43; }

my $whoistimeout = 15;
my $child        = 0;
foreach my $ip ( keys %IPS ) {
    if ( my $child <= 5 ) {
        if ( fork() ) {
            $child++;

#master
        }
        else {
            my $name = whoisns($ip);
            print "$ip=$name\n";
            exit;
        }
    }
    else {
        sleep 1;
    }

while ( waitpid( -1, 1 ) > 0 ) {
        $child--;
    }
}

while ( waitpid( -1, 0 ) > 0 ) {
    $child--;
}

sub whoisns {
    my ( $ip, $req ) = @_;
    my ($gotanswer) = 0;
    my ($attempts)  = 0;
    my ($ns)        = '';
    while ( !$gotanswer ) {
        $attempts++;
        eval {
            local $SIG{'__DIE__'} = 'DEFAULT';
            local $SIG{'ALRM'}    = sub { die; };
            alarm($whoistimeout);
            my $internics;
            socket( $internics, &AF_INET, &SOCK_STREAM, $proto );
            my $sin = sockaddr_in( $port, $iaddr );
            connect( $internics, $sin );
            send $internics, "$ip\r\n", 0;

while (<$internics>) {

if ( /ip address: (\S+)/i && $req == 1 ) {
                    $attempts = 999;
                    $ns       = $1;
                    last;
                }
                if ( /server name: (\S+)/i && $req != 1 ) {
                    $attempts = 999;
                    $ns       = $1;
                    last;
                }
            }
            alarm(0);
        };
        alarm(0);
        if ( $attempts >= 3 ) { last; }
    }
    alarm(0);
    return ($ns);
}