Asumming I've understood your question correctly, something like the following?
#!/usr/bin/perl -w
use strict;
my $data = join '', <DATA>;
$data =~ s|(?=^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\nOS Type: unknown$)|
+\n|gm;
print $data;
exit(1);
__DATA__
10.1.1.1
bogus info
10.1.1.2
this could be anything
10.1.1.3
OS Type: unknown
10.1.1.4
filler information
10.1.1.5
OS Type: unknown
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